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 = 'sleepy-hollow' and st_surl='illinois' and iso_cc = 'US' and prim_loc in (1,2) Sleepy Hollow Illinois Climate Data - Updated February 2026

Sleepy Hollow Illinois Climate Data

Monthly Average Climate Data for Sleepy Hollow Illinois

Switch Data to Celsius/Metric Units

Month	Avg. Low	Avg. High	Avg. Precip
January	14.6 °F	30.3 °F	1.95 in.
February	17.3 °F	34.3 °F	1.85 in.
March	26.9 °F	45.9 °F	2.26 in.
April	37.2 °F	58.6 °F	3.82 in.
May	48.2 °F	70.1 °F	5.18 in.
June	58.2 °F	80.0 °F	4.77 in.
July	63.1 °F	84.0 °F	4.01 in.
August	61.5 °F	82.0 °F	4.15 in.
September	53.5 °F	75.3 °F	3.56 in.
October	41.7 °F	62.2 °F	3.31 in.
November	30.6 °F	47.7 °F	2.55 in.
December	20.6 °F	35.6 °F	2.17 in.
Annual	39.5 °F	58.8 °F	39.58 in.

Climate Data for Sleepy Hollow 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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