{"metadata":{"title":"Swan Lake, MT Monthly Climate Normals","page_url":"https://plainclimate.com/city/swan-lake-mt","primary_station_id":"USC00248087","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, \"Swan Lake, MT Climate Normals\". https://plainclimate.com/city/swan-lake-mt","row_count":12},"annual_summary":{"city_slug":"swan-lake-mt","ann_tavg":43.5,"ann_tmax":54.9,"ann_tmin":32.1,"ann_prcp":null,"ann_snow":null,"ann_htdd":7953.2,"ann_cldd":142.1,"frost_first":"09/19","frost_last":"05/17","growing_season":125,"warmest_month":7,"coldest_month":1,"wettest_month":1,"driest_month":null,"snowiest_month":null,"comfort_score":null},"data":[{"month":"January","month_number":1,"avg_temp_f":24.3,"avg_high_f":30.7,"avg_low_f":17.8,"precip_in":null,"snow_in":null,"heating_degree_days":1263.2,"cooling_degree_days":0,"days_with_precip":null,"days_with_snow":null,"days_freezing":30.4,"days_90f_plus":0,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"February","month_number":2,"avg_temp_f":27,"avg_high_f":36.1,"avg_low_f":17.9,"precip_in":null,"snow_in":null,"heating_degree_days":1063.9,"cooling_degree_days":0,"days_with_precip":null,"days_with_snow":null,"days_freezing":27.9,"days_90f_plus":0,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"March","month_number":3,"avg_temp_f":35.4,"avg_high_f":45.2,"avg_low_f":25.6,"precip_in":null,"snow_in":null,"heating_degree_days":917.7,"cooling_degree_days":0,"days_with_precip":null,"days_with_snow":null,"days_freezing":29.3,"days_90f_plus":0,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"April","month_number":4,"avg_temp_f":42.7,"avg_high_f":54.1,"avg_low_f":31.3,"precip_in":null,"snow_in":null,"heating_degree_days":669,"cooling_degree_days":0,"days_with_precip":null,"days_with_snow":null,"days_freezing":21.5,"days_90f_plus":0,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"May","month_number":5,"avg_temp_f":51.2,"avg_high_f":64.2,"avg_low_f":38.1,"precip_in":null,"snow_in":null,"heating_degree_days":430.5,"cooling_degree_days":1.1,"days_with_precip":null,"days_with_snow":null,"days_freezing":8.9,"days_90f_plus":0.2,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"June","month_number":6,"avg_temp_f":57.6,"avg_high_f":70.7,"avg_low_f":44.4,"precip_in":null,"snow_in":null,"heating_degree_days":234.5,"cooling_degree_days":11,"days_with_precip":null,"days_with_snow":null,"days_freezing":0.9,"days_90f_plus":0.8,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"July","month_number":7,"avg_temp_f":64.7,"avg_high_f":81.8,"avg_low_f":47.6,"precip_in":null,"snow_in":null,"heating_degree_days":77.9,"cooling_degree_days":68.4,"days_with_precip":null,"days_with_snow":null,"days_freezing":0.1,"days_90f_plus":6.2,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"August","month_number":8,"avg_temp_f":63.8,"avg_high_f":81.7,"avg_low_f":46,"precip_in":null,"snow_in":null,"heating_degree_days":94.4,"cooling_degree_days":58.6,"days_with_precip":null,"days_with_snow":null,"days_freezing":0.9,"days_90f_plus":7.3,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"September","month_number":9,"avg_temp_f":54.5,"avg_high_f":70.1,"avg_low_f":38.9,"precip_in":null,"snow_in":null,"heating_degree_days":317.9,"cooling_degree_days":2.9,"days_with_precip":null,"days_with_snow":null,"days_freezing":6.1,"days_90f_plus":1.3,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"October","month_number":10,"avg_temp_f":43.4,"avg_high_f":54.8,"avg_low_f":32.1,"precip_in":null,"snow_in":null,"heating_degree_days":668.1,"cooling_degree_days":0,"days_with_precip":null,"days_with_snow":null,"days_freezing":20.2,"days_90f_plus":0,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"November","month_number":11,"avg_temp_f":32.2,"avg_high_f":38.9,"avg_low_f":25.5,"precip_in":null,"snow_in":null,"heating_degree_days":984,"cooling_degree_days":0,"days_with_precip":null,"days_with_snow":null,"days_freezing":27,"days_90f_plus":0,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"December","month_number":12,"avg_temp_f":25.3,"avg_high_f":30.4,"avg_low_f":20.1,"precip_in":null,"snow_in":null,"heating_degree_days":1232.1,"cooling_degree_days":0,"days_with_precip":null,"days_with_snow":null,"days_freezing":30.3,"days_90f_plus":0,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null}]}