{"metadata":{"title":"Helena, MT Monthly Climate Normals","page_url":"https://plainclimate.com/city/helena-mt","primary_station_id":"USW00024144","source":"NOAA 1991-2020 U.S. Climate Normals","source_url":"https://www.ncei.noaa.gov/products/land-based-station/us-climate-normals","vintage":"2026-08-04","license":"CC0 1.0","license_url":"https://creativecommons.org/publicdomain/zero/1.0/","citation":"PlainClimate, \"Helena, MT Climate Normals\". https://plainclimate.com/city/helena-mt","row_count":12},"annual_summary":{"city_slug":"helena-mt","ann_tavg":45.5,"ann_tmax":57.7,"ann_tmin":33.4,"ann_prcp":11.4,"ann_snow":37.2,"ann_htdd":7498.7,"ann_cldd":434,"frost_first":"09/30","frost_last":"05/09","growing_season":144,"warmest_month":7,"coldest_month":1,"wettest_month":6,"driest_month":1,"snowiest_month":12,"comfort_score":49},"data":[{"month":"January","month_number":1,"avg_temp_f":23,"avg_high_f":32.4,"avg_low_f":13.5,"precip_in":0.39,"snow_in":6.6,"heating_degree_days":1303.5,"cooling_degree_days":0,"days_with_precip":6.5,"days_with_snow":5.6,"days_freezing":29.4,"days_90f_plus":0,"humidity_pct":66.58333333333333,"wind_speed_mph":5.883333333333333,"clear_sky_pct":43.32083333333333,"overcast_pct":29.2375},{"month":"February","month_number":2,"avg_temp_f":27.2,"avg_high_f":37.2,"avg_low_f":17.2,"precip_in":0.42,"snow_in":6.6,"heating_degree_days":1058.4,"cooling_degree_days":0,"days_with_precip":6.5,"days_with_snow":5.6,"days_freezing":26,"days_90f_plus":0,"humidity_pct":61.125,"wind_speed_mph":6.4624999999999995,"clear_sky_pct":41.31666666666667,"overcast_pct":30.058333333333334},{"month":"March","month_number":3,"avg_temp_f":36.1,"avg_high_f":47.5,"avg_low_f":24.6,"precip_in":0.52,"snow_in":4.6,"heating_degree_days":897.5,"cooling_degree_days":0,"days_with_precip":6.9,"days_with_snow":3.7,"days_freezing":25.4,"days_90f_plus":0,"humidity_pct":54.166666666666664,"wind_speed_mph":7.933333333333334,"clear_sky_pct":39.454166666666666,"overcast_pct":29.416666666666668},{"month":"April","month_number":4,"avg_temp_f":44.5,"avg_high_f":56.7,"avg_low_f":32.4,"precip_in":1.02,"snow_in":2.9,"heating_degree_days":613.6,"cooling_degree_days":0.1,"days_with_precip":8.8,"days_with_snow":2.1,"days_freezing":15.1,"days_90f_plus":0,"humidity_pct":48.625,"wind_speed_mph":8.766666666666667,"clear_sky_pct":45.74583333333334,"overcast_pct":25.008333333333336},{"month":"May","month_number":5,"avg_temp_f":53.9,"avg_high_f":66.4,"avg_low_f":41.5,"precip_in":1.95,"snow_in":0.1,"heating_degree_days":349.8,"cooling_degree_days":7.2,"days_with_precip":11.2,"days_with_snow":0.2,"days_freezing":3.4,"days_90f_plus":0.3,"humidity_pct":53.541666666666664,"wind_speed_mph":7.670833333333333,"clear_sky_pct":43.87083333333334,"overcast_pct":25.96666666666667},{"month":"June","month_number":6,"avg_temp_f":61.7,"avg_high_f":74.7,"avg_low_f":48.7,"precip_in":2.21,"snow_in":0,"heating_degree_days":144.1,"cooling_degree_days":45.2,"days_with_precip":11.5,"days_with_snow":0.1,"days_freezing":0.1,"days_90f_plus":2.4,"humidity_pct":45.583333333333336,"wind_speed_mph":7.483333333333333,"clear_sky_pct":66.38333333333334,"overcast_pct":10.466666666666667},{"month":"July","month_number":7,"avg_temp_f":70.6,"avg_high_f":86.1,"avg_low_f":55.1,"precip_in":1.06,"snow_in":0,"heating_degree_days":23.4,"cooling_degree_days":196.9,"days_with_precip":7.5,"days_with_snow":0,"days_freezing":0,"days_90f_plus":12.2,"humidity_pct":40.291666666666664,"wind_speed_mph":6.691666666666666,"clear_sky_pct":74.54583333333333,"overcast_pct":5.875},{"month":"August","month_number":8,"avg_temp_f":68.8,"avg_high_f":84.6,"avg_low_f":52.9,"precip_in":1.04,"snow_in":0.3,"heating_degree_days":40,"cooling_degree_days":156.2,"days_with_precip":6.3,"days_with_snow":0.1,"days_freezing":0,"days_90f_plus":10.6,"humidity_pct":42.583333333333336,"wind_speed_mph":6.375,"clear_sky_pct":69.45833333333333,"overcast_pct":9.991666666666667},{"month":"September","month_number":9,"avg_temp_f":58.9,"avg_high_f":73.3,"avg_low_f":44.6,"precip_in":0.96,"snow_in":0.2,"heating_degree_days":209.5,"cooling_degree_days":27.9,"days_with_precip":5.8,"days_with_snow":0,"days_freezing":1.7,"days_90f_plus":1.8,"humidity_pct":51.333333333333336,"wind_speed_mph":6.1875,"clear_sky_pct":63.63333333333333,"overcast_pct":16.945833333333333},{"month":"October","month_number":10,"avg_temp_f":45.5,"avg_high_f":57.6,"avg_low_f":33.5,"precip_in":0.78,"snow_in":2.8,"heating_degree_days":603.4,"cooling_degree_days":0.5,"days_with_precip":7,"days_with_snow":1.5,"days_freezing":13.8,"days_90f_plus":0,"humidity_pct":59.791666666666664,"wind_speed_mph":6.245833333333334,"clear_sky_pct":50.574999999999996,"overcast_pct":26.162499999999998},{"month":"November","month_number":11,"avg_temp_f":32.8,"avg_high_f":42.8,"avg_low_f":22.8,"precip_in":0.59,"snow_in":5.4,"heating_degree_days":966,"cooling_degree_days":0,"days_with_precip":6.5,"days_with_snow":4,"days_freezing":25.3,"days_90f_plus":0,"humidity_pct":66.29166666666667,"wind_speed_mph":5.758333333333333,"clear_sky_pct":45.24782608695652,"overcast_pct":29.94347826086957},{"month":"December","month_number":12,"avg_temp_f":23.4,"avg_high_f":32.6,"avg_low_f":14.2,"precip_in":0.46,"snow_in":7.7,"heating_degree_days":1289.5,"cooling_degree_days":0,"days_with_precip":6.6,"days_with_snow":5.2,"days_freezing":29.7,"days_90f_plus":0,"humidity_pct":69.45833333333333,"wind_speed_mph":5.0625,"clear_sky_pct":40.42727272727273,"overcast_pct":32.70909090909091}]}