{"metadata":{"title":"Hayward Air Terminal, CA Monthly Climate Normals","page_url":"https://plainclimate.com/city/hayward-air-terminal-ca","primary_station_id":"USW00093228","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, \"Hayward Air Terminal, CA Climate Normals\". https://plainclimate.com/city/hayward-air-terminal-ca","row_count":12},"annual_summary":{"city_slug":"hayward-air-terminal-ca","ann_tavg":59.6,"ann_tmax":68.5,"ann_tmin":50.8,"ann_prcp":16,"ann_snow":null,"ann_htdd":2315.3,"ann_cldd":367.2,"frost_first":"12/25","frost_last":"01/02","growing_season":357,"warmest_month":8,"coldest_month":1,"wettest_month":12,"driest_month":7,"snowiest_month":null,"comfort_score":76},"data":[{"month":"January","month_number":1,"avg_temp_f":51.2,"avg_high_f":59.3,"avg_low_f":43.1,"precip_in":2.91,"snow_in":null,"heating_degree_days":427.8,"cooling_degree_days":0,"days_with_precip":9.5,"days_with_snow":null,"days_freezing":0.6,"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":53.5,"avg_high_f":61.9,"avg_low_f":45.1,"precip_in":3.11,"snow_in":null,"heating_degree_days":322,"cooling_degree_days":0.1,"days_with_precip":9.4,"days_with_snow":null,"days_freezing":0,"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":55.9,"avg_high_f":64.4,"avg_low_f":47.4,"precip_in":2.35,"snow_in":null,"heating_degree_days":284.5,"cooling_degree_days":2.4,"days_with_precip":9.4,"days_with_snow":null,"days_freezing":0,"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":58.2,"avg_high_f":66.8,"avg_low_f":49.5,"precip_in":1.2,"snow_in":null,"heating_degree_days":214.4,"cooling_degree_days":8.9,"days_with_precip":6.1,"days_with_snow":null,"days_freezing":0,"days_90f_plus":0.1,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"May","month_number":5,"avg_temp_f":60.9,"avg_high_f":69.3,"avg_low_f":52.4,"precip_in":0.58,"snow_in":null,"heating_degree_days":149.2,"cooling_degree_days":20.6,"days_with_precip":2.8,"days_with_snow":null,"days_freezing":0,"days_90f_plus":0.7,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"June","month_number":6,"avg_temp_f":64.6,"avg_high_f":74,"avg_low_f":55.1,"precip_in":0.15,"snow_in":null,"heating_degree_days":64.3,"cooling_degree_days":50.8,"days_with_precip":0.8,"days_with_snow":null,"days_freezing":0,"days_90f_plus":1.3,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"July","month_number":7,"avg_temp_f":66.1,"avg_high_f":74.7,"avg_low_f":57.4,"precip_in":0,"snow_in":null,"heating_degree_days":29.1,"cooling_degree_days":61.7,"days_with_precip":0.1,"days_with_snow":null,"days_freezing":0,"days_90f_plus":1.1,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"August","month_number":8,"avg_temp_f":67.3,"avg_high_f":76.4,"avg_low_f":58.2,"precip_in":0.1,"snow_in":null,"heating_degree_days":14.7,"cooling_degree_days":85.9,"days_with_precip":0.4,"days_with_snow":null,"days_freezing":0,"days_90f_plus":1.6,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"September","month_number":9,"avg_temp_f":67.3,"avg_high_f":77,"avg_low_f":57.6,"precip_in":0.08,"snow_in":null,"heating_degree_days":24.9,"cooling_degree_days":93.8,"days_with_precip":0.9,"days_with_snow":null,"days_freezing":0,"days_90f_plus":3,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"October","month_number":10,"avg_temp_f":63.5,"avg_high_f":73.5,"avg_low_f":53.5,"precip_in":0.81,"snow_in":null,"heating_degree_days":87.6,"cooling_degree_days":41.1,"days_with_precip":2.9,"days_with_snow":null,"days_freezing":0,"days_90f_plus":0.9,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"November","month_number":11,"avg_temp_f":56.2,"avg_high_f":65.1,"avg_low_f":47.2,"precip_in":1.51,"snow_in":null,"heating_degree_days":267.5,"cooling_degree_days":2,"days_with_precip":7.2,"days_with_snow":null,"days_freezing":0,"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":51.2,"avg_high_f":59.4,"avg_low_f":42.9,"precip_in":3.2,"snow_in":null,"heating_degree_days":429.3,"cooling_degree_days":0,"days_with_precip":10,"days_with_snow":null,"days_freezing":0.5,"days_90f_plus":0,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null}]}