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 = 'rock-island' and st_surl='washington' and iso_cc = 'US' and prim_loc in (1,2) Rock Island Washington Climate Data - Updated February 2026

Rock Island Washington Climate Data

Monthly Average Climate Data for Rock Island Washington

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January25.8 °F36.5 °F1.38 in.
February28.3 °F44.5 °F0.89 in.
March33.5 °F55.0 °F0.88 in.
April39.9 °F64.6 °F0.66 in.
May48.1 °F74.4 °F0.77 in.
June54.4 °F80.8 °F0.58 in.
July60.7 °F90.2 °F0.28 in.
August59.8 °F89.5 °F0.2 in.
September51.4 °F80.2 °F0.27 in.
October40.6 °F64.3 °F0.73 in.
November31.9 °F47.4 °F0.89 in.
December26.2 °F36.5 °F1.48 in.
Annual41.7 °F63.7 °F9.01 in.

Climate Data for Rock Island Washington

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateMar. 21 - Mar. 31
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 ConditionsAbnormally Dry
Köppen Climate ClassificationBSk - Cold Semi-Arid Climate
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