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 = 'carol-stream' and st_surl='illinois' and iso_cc = 'US' and prim_loc in (1,2) Carol Stream Illinois Climate Data - Updated February 2026

Carol Stream Illinois Climate Data

Monthly Average Climate Data for Carol Stream Illinois

Switch Data to Celsius/Metric Units

Month	Avg. Low	Avg. High	Avg. Precip
January	15.2 °F	31.1 °F	2.07 in.
February	17.9 °F	35.0 °F	1.99 in.
March	27.4 °F	46.6 °F	2.31 in.
April	37.7 °F	59.3 °F	3.83 in.
May	48.6 °F	70.6 °F	4.89 in.
June	58.6 °F	80.5 °F	4.5 in.
July	63.5 °F	84.5 °F	3.74 in.
August	62.0 °F	82.5 °F	4.1 in.
September	54.1 °F	75.9 °F	3.38 in.
October	42.0 °F	62.7 °F	3.46 in.
November	31.0 °F	48.3 °F	2.57 in.
December	21.2 °F	36.2 °F	2.21 in.
Annual	39.9 °F	59.4 °F	39.05 in.

Climate Data for Carol Stream 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	Normal
Köppen Climate Classification	Dfa - Humid Continental Hot Summers With Year Around Precipitation

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