{"metadata":{"title":"Copco #1 Dam, CA Monthly Climate Normals","page_url":"https://plainclimate.com/city/copco-1-dam-ca","primary_station_id":"USC00041990","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, \"Copco #1 Dam, CA Climate Normals\". https://plainclimate.com/city/copco-1-dam-ca","row_count":12},"annual_summary":{"city_slug":"copco-1-dam-ca","ann_tavg":53.8,"ann_tmax":68.6,"ann_tmin":39.1,"ann_prcp":20.43,"ann_snow":14.5,"ann_htdd":4894.9,"ann_cldd":851.9,"frost_first":"10/21","frost_last":"05/04","growing_season":170,"warmest_month":7,"coldest_month":12,"wettest_month":12,"driest_month":8,"snowiest_month":1,"comfort_score":64},"data":[{"month":"January","month_number":1,"avg_temp_f":37.3,"avg_high_f":48.1,"avg_low_f":26.5,"precip_in":3.37,"snow_in":4.7,"heating_degree_days":858.7,"cooling_degree_days":0,"days_with_precip":13.2,"days_with_snow":2.2,"days_freezing":26.4,"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":41.1,"avg_high_f":53.4,"avg_low_f":28.7,"precip_in":2.28,"snow_in":2.7,"heating_degree_days":670.6,"cooling_degree_days":0,"days_with_precip":10.3,"days_with_snow":1.8,"days_freezing":21.1,"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":45.3,"avg_high_f":58.4,"avg_low_f":32.2,"precip_in":2.01,"snow_in":0.6,"heating_degree_days":610.9,"cooling_degree_days":0,"days_with_precip":11.6,"days_with_snow":0.5,"days_freezing":14.8,"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":49.5,"avg_high_f":64.2,"avg_low_f":34.9,"precip_in":1.69,"snow_in":0.6,"heating_degree_days":463.8,"cooling_degree_days":0.7,"days_with_precip":10.5,"days_with_snow":0.2,"days_freezing":8.8,"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":57.8,"avg_high_f":73.8,"avg_low_f":41.9,"precip_in":1.4,"snow_in":0,"heating_degree_days":244.7,"cooling_degree_days":22.8,"days_with_precip":7.8,"days_with_snow":0,"days_freezing":2.5,"days_90f_plus":1.1,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"June","month_number":6,"avg_temp_f":65.3,"avg_high_f":82,"avg_low_f":48.5,"precip_in":0.9,"snow_in":0,"heating_degree_days":101.6,"cooling_degree_days":109.3,"days_with_precip":3.9,"days_with_snow":0,"days_freezing":0.6,"days_90f_plus":9.8,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"July","month_number":7,"avg_temp_f":74.3,"avg_high_f":92.9,"avg_low_f":55.7,"precip_in":0.47,"snow_in":0,"heating_degree_days":7.4,"cooling_degree_days":295,"days_with_precip":1.8,"days_with_snow":0,"days_freezing":0,"days_90f_plus":22.7,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"August","month_number":8,"avg_temp_f":74.1,"avg_high_f":92.9,"avg_low_f":55.3,"precip_in":0.25,"snow_in":0,"heating_degree_days":2.4,"cooling_degree_days":284.3,"days_with_precip":1.7,"days_with_snow":0,"days_freezing":0,"days_90f_plus":25.7,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"September","month_number":9,"avg_temp_f":66.9,"avg_high_f":85.2,"avg_low_f":48.6,"precip_in":0.48,"snow_in":0,"heating_degree_days":72,"cooling_degree_days":128.6,"days_with_precip":2.7,"days_with_snow":0,"days_freezing":0,"days_90f_plus":13.1,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"October","month_number":10,"avg_temp_f":54.4,"avg_high_f":70,"avg_low_f":38.7,"precip_in":1.39,"snow_in":0,"heating_degree_days":341.1,"cooling_degree_days":11.2,"days_with_precip":5.9,"days_with_snow":0,"days_freezing":4.4,"days_90f_plus":1.1,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"November","month_number":11,"avg_temp_f":43.7,"avg_high_f":55.6,"avg_low_f":31.9,"precip_in":2.68,"snow_in":1.5,"heating_degree_days":637.4,"cooling_degree_days":0,"days_with_precip":11,"days_with_snow":0.8,"days_freezing":15.3,"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":36.4,"avg_high_f":46.8,"avg_low_f":26.1,"precip_in":3.51,"snow_in":4.4,"heating_degree_days":884.4,"cooling_degree_days":0,"days_with_precip":13.2,"days_with_snow":2.4,"days_freezing":24.9,"days_90f_plus":0,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null}]}