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 = 'prosser' and st_surl='washington' and iso_cc = 'US' and prim_loc in (1,2) Prosser Washington Climate Data - Updated February 2026

Prosser Washington Climate Data

Monthly Average Climate Data for Prosser Washington

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January26.6 °F40.2 °F1.23 in.
February27.4 °F47.6 °F0.87 in.
March31.9 °F57.0 °F0.72 in.
April37.0 °F65.0 °F0.76 in.
May45.4 °F74.4 °F0.67 in.
June51.2 °F81.2 °F0.68 in.
July55.5 °F90.3 °F0.42 in.
August54.6 °F89.2 °F0.22 in.
September47.1 °F79.8 °F0.3 in.
October38.2 °F65.4 °F0.86 in.
November30.3 °F50.1 °F0.94 in.
December26.1 °F40.1 °F1.21 in.
Annual39.3 °F65 °F8.88 in.

Climate Data for Prosser Washington

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost75-100 Days
Plant Hardiness ZoneZone 7b : 5°F to 10°F
Plant Hardiness Zone - 2012Zone 7a : 0°F to 5°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationBSk - Cold Semi-Arid Climate
2026 plantmaps.com