{"metadata":{"title":"Yellowstone Park Mammoth, WY Monthly Climate Normals","page_url":"https://plainclimate.com/city/yellowstone-park-mammoth-wy","primary_station_id":"USC00489905","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, \"Yellowstone Park Mammoth, WY Climate Normals\". https://plainclimate.com/city/yellowstone-park-mammoth-wy","row_count":12},"annual_summary":{"city_slug":"yellowstone-park-mammoth-wy","ann_tavg":40.8,"ann_tmax":53.3,"ann_tmin":28.3,"ann_prcp":14.8,"ann_snow":71.5,"ann_htdd":8923.5,"ann_cldd":126.3,"frost_first":"09/14","frost_last":"06/03","growing_season":103,"warmest_month":7,"coldest_month":12,"wettest_month":6,"driest_month":2,"snowiest_month":12,"comfort_score":34},"data":[{"month":"January","month_number":1,"avg_temp_f":21.7,"avg_high_f":31.4,"avg_low_f":11.9,"precip_in":0.91,"snow_in":11.5,"heating_degree_days":1343.9,"cooling_degree_days":0,"days_with_precip":10.6,"days_with_snow":8.7,"days_freezing":30.7,"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":23.3,"avg_high_f":34.2,"avg_low_f":12.3,"precip_in":0.79,"snow_in":11.5,"heating_degree_days":1168.9,"cooling_degree_days":0,"days_with_precip":11.4,"days_with_snow":9.4,"days_freezing":27.2,"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":30.5,"avg_high_f":41.9,"avg_low_f":19.1,"precip_in":1.09,"snow_in":10.9,"heating_degree_days":1069.6,"cooling_degree_days":0,"days_with_precip":10.5,"days_with_snow":7,"days_freezing":28.7,"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":38,"avg_high_f":49.7,"avg_low_f":26.3,"precip_in":1.4,"snow_in":7.8,"heating_degree_days":809.9,"cooling_degree_days":0,"days_with_precip":11.3,"days_with_snow":5.5,"days_freezing":23.1,"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":47.1,"avg_high_f":59.6,"avg_low_f":34.6,"precip_in":1.82,"snow_in":1.7,"heating_degree_days":555.1,"cooling_degree_days":0.1,"days_with_precip":12.8,"days_with_snow":1.2,"days_freezing":9.8,"days_90f_plus":0,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"June","month_number":6,"avg_temp_f":55.8,"avg_high_f":69.5,"avg_low_f":42,"precip_in":1.86,"snow_in":0.3,"heating_degree_days":286.7,"cooling_degree_days":9.2,"days_with_precip":12.5,"days_with_snow":0.1,"days_freezing":1.2,"days_90f_plus":0.2,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"July","month_number":7,"avg_temp_f":64.6,"avg_high_f":80.8,"avg_low_f":48.3,"precip_in":1.27,"snow_in":0,"heating_degree_days":80.3,"cooling_degree_days":66.2,"days_with_precip":9.2,"days_with_snow":0,"days_freezing":0,"days_90f_plus":3.3,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"August","month_number":8,"avg_temp_f":63.1,"avg_high_f":79.8,"avg_low_f":46.5,"precip_in":1.05,"snow_in":0,"heating_degree_days":103.1,"cooling_degree_days":45.7,"days_with_precip":8.5,"days_with_snow":0,"days_freezing":0.4,"days_90f_plus":1.7,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"September","month_number":9,"avg_temp_f":53.9,"avg_high_f":68.8,"avg_low_f":39,"precip_in":1.21,"snow_in":0.6,"heating_degree_days":338.1,"cooling_degree_days":5,"days_with_precip":8.7,"days_with_snow":0.3,"days_freezing":4.9,"days_90f_plus":0.3,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"October","month_number":10,"avg_temp_f":41.3,"avg_high_f":53.6,"avg_low_f":28.9,"precip_in":1.34,"snow_in":4.7,"heating_degree_days":736.2,"cooling_degree_days":0,"days_with_precip":9.7,"days_with_snow":2.8,"days_freezing":19.2,"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":29.3,"avg_high_f":39.4,"avg_low_f":19.2,"precip_in":1.15,"snow_in":9.9,"heating_degree_days":1071,"cooling_degree_days":0,"days_with_precip":9.6,"days_with_snow":7.5,"days_freezing":26.8,"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":21.1,"avg_high_f":30.3,"avg_low_f":11.9,"precip_in":0.91,"snow_in":12.6,"heating_degree_days":1360.7,"cooling_degree_days":0,"days_with_precip":11.9,"days_with_snow":10.2,"days_freezing":30.3,"days_90f_plus":0,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null}]}