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 = 'twin-grove' and st_surl='illinois' and iso_cc = 'US' and prim_loc in (1,2) Twin Grove Illinois Climate Data - Updated February 2026

Twin Grove Illinois Climate Data

Monthly Average Climate Data for Twin Grove Illinois

Switch Data to Celsius/Metric Units

Month	Avg. Low	Avg. High	Avg. Precip
January	16.0 °F	32.4 °F	2.33 in.
February	19.5 °F	37.3 °F	1.92 in.
March	28.8 °F	49.4 °F	2.71 in.
April	39.8 °F	62.7 °F	3.81 in.
May	51.4 °F	73.4 °F	4.61 in.
June	61.1 °F	82.3 °F	4.17 in.
July	64.2 °F	85.5 °F	3.83 in.
August	62.3 °F	83.5 °F	3.66 in.
September	54.5 °F	78.4 °F	3.3 in.
October	43.0 °F	65.3 °F	3.31 in.
November	31.6 °F	50.3 °F	2.82 in.
December	21.9 °F	37.6 °F	2.36 in.
Annual	41.2 °F	61.5 °F	38.83 in.

Climate Data for Twin Grove 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 6a : -10°F to -5°F
Plant Hardiness Zone - 2012	Zone 5b : -15°F to -10°F
Current Drought Conditions	Moderate Drought
Köppen Climate Classification	Dfa - Humid Continental Hot Summers With Year Around Precipitation

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