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 = 'westport' and st_surl='south-dakota' and iso_cc = 'US' and prim_loc in (1,2) Westport South Dakota Climate Data - Updated February 2026

Westport South Dakota Climate Data

Monthly Average Climate Data for Westport South Dakota

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January1.8 °F21.3 °F0.43 in.
February6.2 °F26.6 °F0.55 in.
March18.5 °F39.2 °F0.95 in.
April31.6 °F54.8 °F1.82 in.
May44.7 °F67.8 °F3.34 in.
June55.6 °F77.4 °F3.74 in.
July60.0 °F82.6 °F3.68 in.
August57.2 °F81.2 °F2.4 in.
September47.8 °F72.9 °F2.2 in.
October34.2 °F57.9 °F1.89 in.
November20.4 °F40.5 °F0.71 in.
December8.5 °F26.6 °F0.57 in.
Annual32.2 °F54.1 °F22.28 in.

Climate Data for Westport South Dakota

Average First Frost DateSep. 21 - Sep. 30
Average Last Frost DateMay 1 - May 10
Average Days With Frost125-150 Days
Plant Hardiness ZoneZone 4a : -30°F to -25°F
Plant Hardiness Zone - 2012Zone 4a : -30°F to -25°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
2026 plantmaps.com