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 = 'allerton' and st_surl='illinois' and iso_cc = 'US' and prim_loc in (1,2) Allerton Illinois Climate Data - Updated February 2026

Allerton Illinois Climate Data

Monthly Average Climate Data for Allerton Illinois

Switch Data to Celsius/Metric Units

Month	Avg. Low	Avg. High	Avg. Precip
January	17.9 °F	33.7 °F	2.43 in.
February	21.1 °F	38.3 °F	2.03 in.
March	30.3 °F	50.1 °F	2.8 in.
April	40.9 °F	63.3 °F	4.34 in.
May	52.7 °F	73.9 °F	4.49 in.
June	61.9 °F	82.4 °F	4.56 in.
July	64.3 °F	84.5 °F	4.14 in.
August	61.9 °F	83.2 °F	2.76 in.
September	54.6 °F	78.7 °F	3.12 in.
October	42.9 °F	65.9 °F	3.29 in.
November	32.3 °F	51.0 °F	3.35 in.
December	23.6 °F	38.7 °F	2.49 in.
Annual	42 °F	62 °F	39.8 in.

Climate Data for Allerton Illinois

Average First Frost Date	Oct. 11 - Oct. 20
Average Last Frost Date	Apr. 11 - Apr. 20
Average Days With Frost	75-100 Days
Plant Hardiness Zone	Zone 6a : -10°F to -5°F
Plant Hardiness Zone - 2012	Zone 5b : -15°F to -10°F
Current Drought Conditions	Extreme Drought
Köppen Climate Classification	Dfa - Humid Continental Hot Summers With Year Around Precipitation

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