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 = 'new-haven' and st_surl='iowa' and iso_cc = 'US' and prim_loc in (1,2) New Haven Iowa Climate Data - Updated February 2026

New Haven Iowa Climate Data

Monthly Average Climate Data for New Haven Iowa

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January7.3 °F24.1 °F0.98 in.
February11.3 °F28.4 °F1.12 in.
March23.3 °F41.2 °F1.88 in.
April35.2 °F56.7 °F3.9 in.
May47.5 °F69.0 °F5.05 in.
June58.1 °F78.6 °F5.92 in.
July61.4 °F81.8 °F4.62 in.
August58.8 °F79.6 °F4.17 in.
September50.3 °F73.6 °F3.7 in.
October37.9 °F60.1 °F2.76 in.
November25.7 °F43.4 °F1.75 in.
December14.3 °F29.7 °F1.44 in.
Annual35.9 °F55.5 °F37.29 in.

Climate Data for New Haven 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
2026 plantmaps.com