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

Mundelein Illinois Climate Data

Monthly Average Climate Data for Mundelein Illinois

Switch Data to Celsius/Metric Units

Month	Avg. Low	Avg. High	Avg. Precip
January	15.2 °F	30.3 °F	1.93 in.
February	17.9 °F	34.0 °F	1.97 in.
March	27.2 °F	44.9 °F	2.33 in.
April	37.5 °F	57.3 °F	3.87 in.
May	48.1 °F	68.5 °F	4.5 in.
June	58.2 °F	78.6 °F	4.49 in.
July	63.6 °F	83.0 °F	3.82 in.
August	62.3 °F	81.2 °F	3.79 in.
September	54.4 °F	74.4 °F	3.47 in.
October	42.7 °F	61.7 °F	3.24 in.
November	31.3 °F	47.5 °F	2.43 in.
December	21.3 °F	35.7 °F	2.11 in.
Annual	40 °F	58.1 °F	37.95 in.

Climate Data for Mundelein Illinois

Average First Frost Date	Oct. 21 - Oct. 31
Average Last Frost Date	Apr. 21 - Apr. 30
Average Days With Frost	75-100 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

2026 plantmaps.com