select pnm,lnm,st_cd,st_nm,cnty_id,dm,dm_date,dm_hist,avg_tmax_data,avg_tmin_data,avg_prcp_data,rec_hi_data,rec_lo_data,avg_sndp_data,x,y,ff,lf,fd,hz,er,hz_source,kg,hzd,clim_stn_nm,hz12,hz90, feels_like_min,feels_like_max,days_of_prcp,snow,cloud_cover,humidity,wind_speed from worldtg8_pm.pm_climate_points_namer where surl = 'coal-valley' and st_surl='illinois' and iso_cc = 'US' and prim_loc in (1,2) Coal Valley Illinois Climate Data - Updated February 2026

Coal Valley Illinois Climate Data

Monthly Average Climate Data for Coal Valley Illinois

Switch Data to Celsius/Metric Units

Month	Avg. Low	Avg. High	Avg. Precip
January	14.3 °F	30.4 °F	1.58 in.
February	17.9 °F	34.9 °F	1.73 in.
March	28.5 °F	47.9 °F	2.47 in.
April	39.6 °F	61.2 °F	3.67 in.
May	51.5 °F	72.3 °F	4.9 in.
June	61.4 °F	81.5 °F	4.83 in.
July	65.1 °F	84.5 °F	4.24 in.
August	62.9 °F	82.7 °F	3.94 in.
September	54.6 °F	76.8 °F	3.61 in.
October	42.9 °F	63.9 °F	2.89 in.
November	30.9 °F	48.8 °F	2.31 in.
December	20.5 °F	35.9 °F	2.07 in.
Annual	40.8 °F	60.1 °F	38.24 in.

Climate Data for Coal Valley Illinois

Average First Frost Date	Oct. 11 - Oct. 20
Average Last Frost Date	Apr. 21 - Apr. 30
Average Days With Frost	100-125 Days
Plant Hardiness Zone	Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012	Zone 5b : -15°F to -10°F
Current Drought Conditions	Abnormally Dry
Köppen Climate Classification	Dfa - Humid Continental Hot Summers With Year Around Precipitation

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