Dekalb, Illinois Weather Conditions

Severe Weather Alerts

National Weather Service:

Special Statement View All Alerts

Your Weather

To update your location please enter your ZIP code, city, state, airport code or country in the field below. Weather by E-mail: Forecast storm alerts. Weather E-Mail Alert Sign Up »

Current Conditions

  • 17°
  • Light Snow
  • Wind: NW 12 mph
  • Humidity: 83%
  • Visibility: 5.0 miles
  • Dew Point: 13°
  • Pressure: 29.76 in. +
  • Heat Index: 5

Select a Section

Click a section below for more information.

Next 12 Hours

3  am
6  am
9  am
12  pm
3  pm
Snow Showers
Snow Showers
Snow Showers
Snow Showers
Snow Showers
Snow Showers
Overcast
Overcast
Overcast
Overcast
18°
17°
18°
18°
19°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Tuesday
  • Snow Showers
  • High: 19 °
  • Low: 6 °
  • Snow Showers
  • Wednesday
  • Partly Cloudy
  • High: 16 °
  • Low: 5 °
  • Partly Cloudy
  • Thursday
  • Clear
  • High: 22 °
  • Low: 13 °
  • Clear
  • Friday
  • Snow Showers
  • High: 23 °
  • Low: 0 °
  • Snow Showers
  • Saturday
  • Clear
  • High: 12 °
  • Low: 5 °
  • Clear

Forecast for Dekalb, Illinois

Updated: 7:46 PM CST on February 8, 2016

  • Rest of Tonight

    Snow showers. New snow accumulation up to 1 inch. Lows 15 to 19. Northwest winds 10 to 20 mph. Gusts up to 30 mph in the evening. Chance of precipitation 80 percent.

  • Tuesday

    Cloudy. Snow showers likely in the morning...then a chance of snow showers in the afternoon. Snow accumulation up to 1 inch. Total snow accumulation 1 to 2 inches. Temperatures nearly steady 15 to 19. Northwest winds 10 to 20 mph with gusts up to 30 mph. Chance of precipitation 60 percent.

  • Tuesday Night

    Mostly cloudy. A 30 percent chance of snow showers in the evening. Lows 1 to 5 above. Wind chills as low as 10 below to 20 below zero. Northwest winds 10 to 20 mph. Gusts up to 30 mph in the evening.

  • Wednesday

    Partly sunny. Highs 12 to 16. Lowest wind chill readings 10 below to 20 below zero in the morning. Northwest winds 10 to 20 mph.

  • Wednesday Night

    Partly cloudy. Lows zero to 4 above. Wind chills as low as 5 below to 15 below zero. Northwest winds 10 to 15 mph.

  • Thursday

    Mostly sunny. Highs 17 to 21.

  • Thursday Night

    Partly cloudy with a 20 percent chance of light snow. Lows 7 to 11 above.

  • Friday

    Partly sunny with a 20 percent chance of light snow. Highs in the lower 20s.

  • Friday Night

    Mostly clear. Lows zero to 4 above.

  • Saturday and Saturday Night

    Mostly clear. Highs 10 to 14. Lows 1 to 5 above.

  • Sunday

    Partly sunny. Highs in the lower 20s.

  • Sunday Night

    Mostly cloudy. Lows 15 to 19.

  • Washingtons Birthday

    Mostly cloudy. Highs in the lower 30s.

Severe Weather Alert Descriptions

 Special Statement  Statement as of 4:07 PM EST on February 8, 2016/


... Light snow likely tonight into early Tuesday...

Light snow is likely tonight into Tuesday morning with some minor
accumulations of an inch or so possible. Light snow will likely
have an adverse impact on the Tuesday morning rush hour.


307 PM CST Mon Feb 8 2016 /407 PM EST Mon Feb 8 2016/

... Light snow likely tonight into early Tuesday...

Light snow is likely tonight into Tuesday morning with some minor
accumulations of an inch or so possible. Light snow will likely
have an adverse impact on the Tuesday morning rush hour.




Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Maplewood, DeKalb, IL

Updated: 3:24 AM CST

Temperature: 17.0 °F Dew Point: 14 °F Humidity: 88% Wind: West at 2.0 mph Pressure: 29.81 in Hourly Precipitation: 0.00 in Windchill: 17 °F Graphs

Location: South DeKalb, DeKalb, IL

Updated: 3:34 AM CST

Temperature: 16.9 °F Dew Point: 14 °F Humidity: 89% Wind: NW at 3.0 mph Pressure: 29.80 in Hourly Precipitation: 0.00 in Windchill: 17 °F Graphs

Location: Northern Illinois University - Davis Hall, DeKalb, IL

Updated: 3:34 AM CST

Temperature: 16.1 °F Dew Point: 13 °F Humidity: 86% Wind: NNE at 1.0 mph Pressure: 29.77 in Hourly Precipitation: 0.00 in Windchill: 16 °F Graphs

Location: Northern Illinois University - Barsema Alumni and Visitors Center, DeKalb, IL

Updated: 3:34 AM CST

Temperature: 16.6 °F Dew Point: 14 °F Humidity: 88% Wind: Calm Pressure: 29.72 in Hourly Precipitation: 0.00 in Windchill: 17 °F Graphs

Location: Rob's Horsepower Haven, DeKalb, IL

Updated: 3:29 AM CST

Temperature: 16.2 °F Dew Point: 13 °F Humidity: 87% Wind: NNE at 4.0 mph Pressure: 29.80 in Hourly Precipitation: 0.00 in Windchill: 10 °F Graphs

Location: River Mist, DeKalb, IL

Updated: 3:34 AM CST

Temperature: 17.2 °F Dew Point: 9 °F Humidity: 69% Wind: West at 5.8 mph Pressure: 29.65 in Hourly Precipitation: 0.00 in Windchill: 9 °F Graphs

Location: DeKalb, IL

Updated: 3:20 AM CST

Temperature: 17.7 °F Dew Point: 14 °F Humidity: 86% Wind: North at 6.0 mph Pressure: 29.78 in Hourly Precipitation: - Windchill: 9 °F Graphs

Location: Sycamore, IL

Updated: 3:34 AM CST

Temperature: 16.5 °F Dew Point: 13 °F Humidity: 87% Wind: NW at 15.0 mph Pressure: 29.82 in Hourly Precipitation: 0.00 in Windchill: 2 °F Graphs

Location: Heron Creek, Sycamore, IL

Updated: 3:34 AM CST

Temperature: 16.7 °F Dew Point: 12 °F Humidity: 82% Wind: NNW at 5.0 mph Pressure: 29.76 in Hourly Precipitation: 0.00 in Windchill: 9 °F Graphs

Location: Out On the Farm, Clare, IL

Updated: 3:30 AM CST

Temperature: 16.4 °F Dew Point: 14 °F Humidity: 88% Wind: NW at 8.0 mph Pressure: 29.81 in Hourly Precipitation: 0.00 in Windchill: 6 °F Graphs

Location: South Grove, Kirkland, IL

Updated: 3:25 AM CST

Temperature: 15.4 °F Dew Point: 14 °F Humidity: 95% Wind: West at 9.4 mph Pressure: 29.73 in Hourly Precipitation: - Windchill: 4 °F Graphs

Location: Ellen Oaks Subdivision, Genoa, IL

Updated: 3:33 AM CST

Temperature: 16.5 °F Dew Point: 14 °F Humidity: 89% Wind: NW at 3.0 mph Pressure: 29.81 in Hourly Precipitation: 0.00 in Windchill: 16 °F Graphs

Location: Herrmann Family Farms, LLC., Shabbona, IL

Updated: 3:33 AM CST

Temperature: 15.4 °F Dew Point: 12 °F Humidity: 88% Wind: North at 13.0 mph Pressure: 28.81 in Hourly Precipitation: - Windchill: 1 °F Graphs

Location: Highway 23, Waterman, IL

Updated: 3:03 AM CST

Temperature: 18.9 °F Dew Point: 13 °F Humidity: 78% Wind: North at - Pressure: 29.86 in Hourly Precipitation: - Windchill: 19 °F Graphs

Location: Redwood Court, Genoa, IL

Updated: 3:24 AM CST

Temperature: 18.3 °F Dew Point: 12 °F Humidity: 77% Wind: North at - Pressure: 29.81 in Hourly Precipitation: 0.00 in Windchill: 18 °F Graphs

Location: Country Meadows, Kirkland, IL

Updated: 3:26 AM CST

Temperature: 15.4 °F Dew Point: 12 °F Humidity: 86% Wind: WNW at 5.0 mph Pressure: 29.78 in Hourly Precipitation: 0.00 in Windchill: 8 °F Graphs

Location: Burlington Prairie Forest Preserve, Sycamore, IL

Updated: 3:28 AM CST

Temperature: 16.0 °F Dew Point: 16 °F Humidity: 99% Wind: West at 3.2 mph Pressure: 29.63 in Hourly Precipitation: - Windchill: 11 °F Graphs

Location: Genoa Road, Genoa, IL

Updated: 3:25 AM CST

Temperature: 17.8 °F Dew Point: 15 °F Humidity: 88% Wind: North at 4.0 mph Pressure: 29.80 in Hourly Precipitation: 0.00 in Windchill: 12 °F Graphs

Location: APRSWXNET, Elburn, IL

Updated: 3:09 AM CST

Temperature: 18 °F Dew Point: 15 °F Humidity: 87% Wind: NW at 3 mph Pressure: 29.78 in Hourly Precipitation: 0.00 in Windchill: 18 °F Graphs

Location: APRSWXNET, Campton Hills, IL

Updated: 2:58 AM CST

Temperature: 17 °F Dew Point: 13 °F Humidity: 84% Wind: NNW at 7 mph Pressure: 29.77 in Hourly Precipitation: 0.00 in Windchill: 7 °F Graphs

Location: Columbine Square, Elburn, IL

Updated: 3:25 AM CST

Temperature: 16.5 °F Dew Point: 13 °F Humidity: 86% Wind: NNW at 4.0 mph Pressure: 29.75 in Hourly Precipitation: 0.00 in Windchill: 10 °F Graphs

Location: Prairie Valley North, Elburn, IL

Updated: 3:34 AM CST

Temperature: 16.2 °F Dew Point: 12 °F Humidity: 85% Wind: WNW at 8.3 mph Pressure: 29.63 in Hourly Precipitation: 0.00 in Windchill: 5 °F Graphs

Location: Prairie Highlands, Elburn, IL

Updated: 3:30 AM CST

Temperature: 18.5 °F Dew Point: 16 °F Humidity: 88% Wind: NW at 7.0 mph Pressure: 29.79 in Hourly Precipitation: 0.00 in Windchill: 9 °F Graphs

Location: Elburn, Elburn, IL

Updated: 3:34 AM CST

Temperature: 17.8 °F Dew Point: 8 °F Humidity: 64% Wind: Calm Pressure: 29.95 in Hourly Precipitation: 0.00 in Windchill: 18 °F Graphs

Location: Cheval de Selle, Elburn, IL

Updated: 3:30 AM CST

Temperature: 16.2 °F Dew Point: 14 °F Humidity: 89% Wind: NW at 13.5 mph Pressure: 29.71 in Hourly Precipitation: - Windchill: 2 °F Graphs

Location: Griffith Avenue, Elburn, IL

Updated: 3:23 AM CST

Temperature: 19.0 °F Dew Point: 14 °F Humidity: 81% Wind: North at - Pressure: 28.97 in Hourly Precipitation: - Windchill: 19 °F Graphs

Location: Hampshire, IL, Hampshire, IL

Updated: 3:34 AM CST

Temperature: 16.2 °F Dew Point: 12 °F Humidity: 85% Wind: NNW at 5.0 mph Pressure: 29.82 in Hourly Precipitation: 0.00 in Windchill: 9 °F Graphs

Location: K9GPC, Rochelle, IL

Updated: 3:34 AM CST

Temperature: 16.2 °F Dew Point: 6 °F Humidity: 63% Wind: NW at 6.0 mph Pressure: 29.75 in Hourly Precipitation: 0.00 in Windchill: 7 °F Graphs

Location: CamptonHillsWeather.com Central Kane County, St Charles, IL

Updated: 3:34 AM CST

Temperature: 17.1 °F Dew Point: 14 °F Humidity: 88% Wind: North at 9.0 mph Pressure: 29.80 in Hourly Precipitation: 0.00 in Windchill: 6 °F Graphs

Location: Lindenwood, Lindenwood, IL

Updated: 3:34 AM CST

Temperature: 16.5 °F Dew Point: 8 °F Humidity: 67% Wind: NW at 12.3 mph Pressure: 28.95 in Hourly Precipitation: 0.00 in Windchill: 3 °F Graphs

Location: OakGrove, Hampshire, IL

Updated: 3:29 AM CST

Temperature: 15.8 °F Dew Point: 13 °F Humidity: 89% Wind: NW at 8.9 mph Pressure: 29.60 in Hourly Precipitation: - Windchill: 4 °F Graphs

Location: Elodie Drive, Elburn, IL

Updated: 3:24 AM CST

Temperature: 20.7 °F Dew Point: 13 °F Humidity: 72% Wind: North at - Pressure: 28.26 in Hourly Precipitation: - Windchill: 21 °F Graphs

Location: APRSWXNET, Rochelle, IL

Updated: 3:00 AM CST

Temperature: 16 °F Dew Point: 13 °F Humidity: 87% Wind: WNW at 8 mph Pressure: 29.76 in Hourly Precipitation: 0.00 in Windchill: 5 °F Graphs

Location: Dugan Road, Sugar Grove, IL

Updated: 3:04 AM CST

Temperature: 18.9 °F Dew Point: 14 °F Humidity: 81% Wind: North at - Pressure: 29.82 in Hourly Precipitation: 0.00 in Windchill: 19 °F Graphs

Location: Campton Hills, Campton Hills, IL

Updated: 3:34 AM CST

Temperature: 17.3 °F Dew Point: 12 °F Humidity: 80% Wind: NW at 12.0 mph Pressure: 29.81 in Hourly Precipitation: 0.00 in Windchill: 4 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion 
National Weather Service Chicago/Romeoville Illinois 
259 am CST Tuesday Feb 9 2016 


Update... 


742 PM CST 


For evening update... 


Minor adjustments to forecast this evening...to refine transition 
to higher probability of precipitation with snow showers spreading south across the 
northeast portion of the forecast area. Also...with some of the 
higher reflectivity returns and some brief 1/2-3/4sm visibilities 
reported have also bumped up quantitative precipitation forecast/snow amounts a bit closer to an 
inch through midnight especially across parts of lake/eastern 
McHenry and Cook counties this evening. 


Snow showers have increased in coverage across northeast Illinois... 
Southern Lake Michigan and far Northwest Indiana this evening in 
response to a sheared middle-level vorticity moving south across Lake 
Michigan. This is expected to continue overnight...with forecast 
soundings depicting cooling of the saturated layer especially 
below 700 mb and development of a deep dendritic growth zone in 
excess of 200 mb. While forcing is not terribly strong...the 
thermodynamic profile should produce light snow fairly easily. 
Light snow was also spreading southeast across the upper 
Mississippi Valley in association with a middle-level speed maximum 
dropping into the western periphery of the large scale trough over 
eastern North America...and light snow should spread into western 
parts of the forecast area overnight. Thus despite relatively low quantitative precipitation forecast values 
on the order of a few hundredths of an inch in any given period 
have carried relatively high probability of precipitation for light snow/snow showers into 
Tuesday. 


Otherwise...forecast in good shape with only minor tweaks made per 
hourly observation trends early this evening. 


Ratzer 


&& 


Short term... 
250 PM CST 


Tonight through Wednesday... 


Snow/snow shower trends and accumulations...Indiana Lake effect 
snow...and colder temperatures are the main forecast concerns 
through mid-week. 


Deep closed upper low was over the region this afternoon within 
large eastern North American upper trough. Several vorticity lobes 
were rotating about this feature...and along steep low level lapse 
rates due to strong cold advection will be the main modulating 
factors in coverage and intensity of light snow/snow showers over 
the next couple of days. One such wave was noted in water vapor 
imagery currently moving southeast across central Illinois...with a 
corresponding area of light snow across southern parts of the 
forecast area this afternoon. Another axis of sheared vorticity 
was over Lake Michigan and eastern Wisconsin with another batch of 
snow showers. Flurries were likely occurring in most other areas 
in saturated cold air mass. Light snow will likely continue to 
affect southern parts of the forecast area for the remainder of the afternoon 
as the central Illinois wave continues to move off to the 
southeast...with light snow/snow showers expected to increase from 
the north again this evening/overnight as sheared vorticity to our 
north wraps south-southeast around upper low center which develops 
across Northeast Indiana/Northwest Ohio. This upper low will 
slowly lift out to the east-northeast on Tuesday...with another 
short wave dropping into the trailing portion of the upper trough 
and across especially eastern parts of the forecast area Tuesday 
night. Model quantitative precipitation forecast amounts remain generally light...with non-uniform 
coverage due to expected often showery nature of precipitation. 
Overall...it still appears that widespread snowfall of an inch to 
perhaps 2-3 inches are likely by the time measurable precipitation shifts 
east of the area late Tuesday night...generally lowest far west 
and higher across the east parts of the County Warning Area. 


Within this weather regime...continued cold advection will result 
in lake-effect snow showers developing across parts of Northwest 
Indiana tonight...and most likely continuing into Thursday morning 
at least in lighter fashion until low level winds back to the 
west. Thermodynamics become favorable for lake snow showers this 
evening... as lake surface to 850 mb Delta-T increases to around 
20 c/km by Tuesday morning. Combined with with deeper forcing 
provided by aforementioned vorticity lobe...the potential for heavier 
snow showers looks to be from later tonight/early Tuesday...and 
again Tuesday night into Wednesday. Low level convergence and 
fetch continue to favor mainly northeast portions of Porter 
County...with the axis of heaviest snow expected to be across La 
Porte and Berrien counties to the east of the County Warning Area. Northeast 
Porter County does have the potential for several inches of 
accumulation during the period...depending upon location/intensity 
of banding. Long duration of light/occasionally moderate snow 
showers totaling perhaps 4+ inches does not appear to warrant 
headlines at this point...though will continue to mention both the 
lake effect and the potential for Tuesday morning rush hour impact 
in an Special Weather Statement. 


Temperatures very slowly falling into the low-middle 20s this 
afternoon...and will continue to fall off into the teens in most 
areas tonight. Little recovery is expected Tuesday as cold 
advection persists...with cold air lingering through middle-week with 
overnight lows in the single digit and highs in the teens by 
Wednesday. 


Ratzer 


&& 


Long term... 
300 PM CST 


Wednesday night through Monday... 


Below normal temperatures to continue into the weekend as large 
scale upper trough over eastern North America shifts slowly 
east...but is reinforced over the weekend by another closed low 
which develops over New England/Quebec. Eventually the trough axis 
shifts far enough to the east for some moderation Sunday night 
into Monday. Strong northwesterly flow aloft downstream of 
western/central Continental U.S. Ridging will likely see several minor short 
waves rippling through the flow. Differences remain in longer 
range guidance with location of low level baroclinic zone to our 
southwest...though the 00z/12z European model (ecmwf) have maintained continuity in 
a minor disturbance tracking across the Midwest Friday with the 
potential for some light snow. Depending on how quickly high 
pressure exits in the day 6-7 period there is also a chance of 
light snow as warm advection develops Monday. Until then... cold 
is the rule with overnight lows in the single digits (and possible 
around zero or below) and highs in the teens to low 20s before 
slight moderation toward the end of the forecast. 


Ratzer 


&& 


Aviation... 
for the 06z tafs... 


Large upper low centered will continue to influence aviation 
weather through Tuesday evening. Main forecast concern and focus 
continues to be timing the best window of lower visibility and potential 
accumulations with occasional snow showers. Gyy and mdw looks to 
be in favored corridor through the early morning hours/09-10z...for 
temporary IFR and even LIFR visibility at times. For Ord/dpa...generally 
MVFR visibility in snow showers during this time...although cannot rule 
out IFR visibility at times. Short range guidance is picking up on a 
subtle wave that could re-enhance snowfall rates toward daybreak. 
Again...gyy should be most favored...even with some added lake 
enhancement potential. Rfd area could finally get into some snow 
shower activity after 07z...and potentially IFR visibility at times. 


The rest of the day Tuesday into Tuesday evening...steep low 
level lapse rates and weak lift could yield additional snow 
showers at any time. Continued to maintain the prob30 group 
during the afternoon for IFR visibility from the previous taf for 
Ord/mdw/gyy/dpa given lower confidence. Confidence is also lower 
in ceilings...as there are pockets of VFR over the area. Guidance is 
showing a signal for increased low-middle MVFR ceiling potential during 
the afternoon and possibly into the evening. Winds will be west- 
northwest...with gusts in the 20-25 knots range this morning through 
tonight. 


Rc 


&& 


Marine... 
258 am CST 


Issued a Gale Warning for the northern two thirds of the lake from 
middle morning through early Wednesday morning. Confidence is just 
high enough to issue the warning...but have high confidence that any 
gales will be on the low end of the spectrum. No changes were made 
to the Small Craft Advisory which GOES through through early 
Wednesday night for the Illinois nearshore waters...and into Thursday 
morning for the Indiana nearshore waters due to hazardous winds and 
waves. 


A weak low over Lake Ontario reaches New England this evening...and 
then merges with a deeper low over the Atlantic Wednesday evening. 
Meanwhile high pressure over the northern plains will build south 
tightening the pressure gradient over the western Great Lakes. 
Northwest winds increase to low end gales this morning and persist 
into Wednesday morning mainly across the northern two thirds of the 
lake. Occasional gales are possible over the southern third of the 
lake tonight into Wednesday morning. Do not have enough confidence 
in a prolonged period of gale force gusts to hoist a Gale Warning 
for the southern third of the lake. 


The high passes south of the lake Thursday evening and winds will 
become west 15-25 knots. A weak low forms over Ontario Thursday 
evening and reaches New England Friday evening. At the same time a 
large high spreads over the northern and Central Plains. This will 
lead to northwest to north winds increasing to at least 30 knots Friday 
afternoon through Saturday morning. The high moves over the lake 
Saturday evening and continues east to the eastern Great Lakes 
Sunday morning. Winds become south in the wake of the high Sunday. 


Jee 


&& 


Lot watches/warnings/advisories... 
Illinois...none. 
In...none. 
Lm...Small Craft Advisory...Indiana nearshore waters until 9 am Thursday. 


Small Craft Advisory...Illinois nearshore waters until 3 am Thursday. 


&& 


$$ 


Visit US at http://weather.Gov/Chicago (all lowercase) 


Follow US on facebook...twitter...and youtube at: 
www.Facebook.Com/nwschicago 
www.Twitter.Com/nwschicago 
www.Youtube.Com/nwschicago 






National Weather Service Glossary of Abbreviations

Non-Expanded Version (with abbreviations)

Powered by the Weather Underground, Inc.