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St Clair County, IL Weather and Climate Synopsis

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A joint service of the UK Ag Weather Center and the National Weather Service.

Weather Summary For Central And Southeast Illinois
National Weather Service Lincoln IL
318 PM CST Sun Dec 17 2017
Cloudy skies were seen across central and southeast Illinois,  
through the afternoon hours. A few light showers were seen, mainly
west of I 55, through the afternoon, as well. Temperatures across
the area at 3 p.m., ranged from 44 degrees at Olney, to 50 degrees
at Springfield.

A weak weather system will track northeast across the region this
evening, producing scattered rain showers. Patchy drizzle or 
sprinkles will linger into Monday, as a weak front shifts through 
the Midwest. After this system exits to the east, dry and 
seasonably mild conditions will prevail over the Midwest, through 

Overnight low temperatures, will range from the 20s across
portions of Iowa and Wisconsin, to the middle 40s across the
Missouri bootheel.

High temperatures on Monday, will range from the 30s across
Wisconsin, to near 60 degrees across southwest Missouri.

National Ag. Weather Outlook, International Ag. Weather Summary
Current Surface Map, [2nd Source TWC]

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Regional Hourly Observations For ST CLAIR County
Issued at 700 PM CST SUN DEC 17 2017

ALTON          CLOUDY    48  43  81 CALM      30.05R                  
BELLEVILLE     CLOUDY    48  41  78 SW8       30.06R                  
CAHOKIA*       CLOUDY    49  41  74 S7        30.06R                  
SPARTA*        CLOUDY    45  44  97 S7        30.09S                  

Current Temperatures, Dewpoint Map, RH, Wind, Regional Obs, Surface 4-Panel
Meteograms : Springfield , Peoria , Quad City , Chicago (O'Hare) , Rockford

Current Agricultural Weather Conditions in Illinois
Based on observations at 700pm CST, Sunday December 17, 2017

Across Illinois...temperatures are near 35 degrees north, near 45 degrees central, and near 44 degrees south. Current sky conditions are cloudy north, cloudy central, and cloudy south. In the north, relative humidity is near 92%, and the dew point is near 33 degrees. In the central part of the state, relative humidity is near 79%, and the dew point is near 39 degrees. In the south, relative humidity is near 93%, and the dew point is near 42 degrees. There is patchy fog north and south. Winds are from the southeast at 3 mph north, where conditions are favorable for spraying. Winds are from the south at 13 mph central, where conditions are not favorable for spraying due to strong winds. Winds are from the south at 6 mph south, where conditions are favorable for spraying. The livestock cold stress index is in the no stress category north, no stress category central, and no stress category south. Based on current available observations, the highest temperature is 48 degrees at Belleville and Alton. The lowest temperature is 33 degrees at Waukegan.

Current NOWCAST not available:
Nowcasts are not issued routinely during fair weather. Only when
precipitation or other significant weather is occuring in this county will these
forecasts be issued. Currently, there is no short term forecast in effect.

US Radar, All NWS Radars (In near-real time),Livestock Heat Stress Index (LSI), Wind Chill Map
Hazardous Weather Outlook For ST CLAIR County,IL

400 PM CST Sun Dec 17 2017

 DAY ONE  Tonight

No hazardous weather is expected at this time.

 DAYS TWO THROUGH SEVEN  Monday through Saturday

No hazardous weather is expected at this time.


Spotter activation is not anticipated tonight.

NWS Severe Weather Map , Convective Outlook

7-Day Forecast For ST CLAIR County, IL
535 PM CST Sun Dec 17 2017

Cloudy. Patchy drizzle after midnight. Low in the lower 40s. Light wind.

Cloudy in the morning and early afternoon then becoming partly sunny. High in the upper 50s. Southwest wind around 10 mph.

Mostly clear. Low around 40. Southwest wind around 10 mph in the evening becoming light after midnight.

Partly sunny. High around 60. Light wind.

Partly cloudy. Low in the upper 30s. Light wind in the evening becoming northeast around 10 mph after midnight.

Partly cloudy in the morning then becoming sunny. High in the lower 50s.

Mostly clear. Low in the mid 30s.

Partly cloudy. High in the mid 50s.

Mostly cloudy with a 20 percent chance of rain. Low in the lower 40s.

Rain likely. High in the lower 50s. Temperature steady or slowly falling in the afternoon. Chance of rain 60 percent.

Colder. Partly cloudy with a 30 percent chance of rain and snow. Low in the upper 20s.

Colder. Partly sunny. High around 40. Temperature steady or slowly falling in the afternoon.

Mostly cloudy. Low in the mid 20s. High in the upper 30s.

12-48 Hr Surface, 12-48 Hr ETA 500mb/Sfc, TWC Forecast, Fire Danger, Day 1 Precip, Day 2 Precip, Days 1-5 Precip
NGM 60 Hr Forecast Meteograms : Springfield , Peoria , Quad City , Chicago (O'Hare) , Rockford , Severe Weather Pot.-Day 1, Day 2

Medium & Long Range Outlook For Illinois
                 6 TO 10 DAY  8 TO 14 DAY   30 DAY    90 DAY 
                   DEC 23-27 DEC 25-DEC 31    DEC       DEC-FEB                      
                 -----------  -----------  --------  ---------
   Temperature:      Below        Below     Normal     Normal                      
 Precipitation:     Normal        Below     Normal      Above                      

....  Medium and long range outlooks provided by NCEP/K. Thomas Priddy
5 Day Rainfall Forecast, 6 to 10 Day , 8 to 14 Day , Text, 30-Day Outook, 90-Day Outook, 120-Day Outlook
MRF 10-Day Forecast Meteograms : Springfield , Peoria , Quad City , Chicago (O'Hare) , Rockford

Almanac Information

Sunday December 17, 2017 the 351th Day of Year

Declination -23.380000
Distance 0.999725 AU
Rise 08:15 EST Set 17:36 EST
Transit Meridian 12:55 EST
Civil Twilight Begins 07:45 EST Ends 18:06 EST

Calculations made for central point in the state.
Time in ET -- and will vary due to location and
elevation -- Priddy

Historical Weather And Climate Facts For Today

A three week blockade of snow began at Portland OR. A record December total
of 34 inches was received. (David Ludlum)
A severe icestorm struck central Illinois. It coated the ground with nearly
two inches of glaze at Springfield. The storm caused 21 million dollars
damage along with much hardship. Ice was on the trees until the 4th of
January, and electricity was not restored until January 10th. (David
An icestorm in western New York State resulted in much damage and hardship.
A Buffalo report stated, "one was kept awake by the breaking limbs, which
snapped off with a report much louder than a rifle shot." (17th-18th) (The
Weather Channel)
A storm in the southwestern U.S. brought heavy rain and heavy snow to parts
of California, Nevada, Arizona, Utah and New Mexico. Charleston NV was
blanketed with 12 inches of snow. Lake Havasu City AZ was drenched with
2.26 inches of rain. (Storm Data) (The National Weather Summary)
Squalls brought locally heavy snow to the southeastern shores of Lake
Michigan. Totals in Michigan ranged up to 14 inches at Harvey. Totals in
Ohio ranged up to 16 inches at Chardon. (The National Weather Summary)
(Storm Data)
Twenty-one cities from Kentucky to Pennsylvania reported record low
temperatures for the date, including Columbus OH with a reading of 12
degrees below zero. Heavy snow continued in the Colorado Rockies. Vail
received 65 inches of snow between the 14th and the 18th of December.
Steamboat Springs was buried under 74 inches, and reported a total of 108
inches of snow between the 10th and the 18th of the month. (The National
Weather Summary) (Storm Data)

Ag Weather Center, Department of Biosystems & Agricultural Engineering, University of Kentucky