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 = 'readlyn' and st_surl='iowa' and iso_cc = 'US' and prim_loc in (1,2) Readlyn Iowa Climate Data - Updated February 2026

Readlyn Iowa Climate Data

Monthly Average Climate Data for Readlyn Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January8.6 °F25.7 °F1.09 in.
February12.6 °F29.8 °F1.13 in.
March24.4 °F43.2 °F1.99 in.
April35.9 °F57.9 °F3.93 in.
May48.1 °F69.9 °F4.96 in.
June58.9 °F79.6 °F5.92 in.
July62.0 °F82.5 °F4.69 in.
August59.3 °F80.5 °F4.17 in.
September50.8 °F74.5 °F3.7 in.
October38.5 °F61.1 °F2.85 in.
November26.3 °F44.8 °F1.94 in.
December15.3 °F31.4 °F1.57 in.
Annual36.7 °F56.7 °F37.94 in.

Climate Data for Readlyn Iowa

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost125-150 Days
Plant Hardiness ZoneZone 5a : -20°F to -15°F
Plant Hardiness Zone - 2012Zone 5a : -20°F to -15°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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