{"metadata":{"title":"Natl Arboretum DC, MD Monthly Climate Normals","page_url":"https://plainclimate.com/city/natl-arboretum-dc-md","primary_station_id":"USC00186350","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, \"Natl Arboretum DC, MD Climate Normals\". https://plainclimate.com/city/natl-arboretum-dc-md","row_count":12},"annual_summary":{"city_slug":"natl-arboretum-dc-md","ann_tavg":58.3,"ann_tmax":68,"ann_tmin":48.6,"ann_prcp":45.59,"ann_snow":9.7,"ann_htdd":4048.5,"ann_cldd":1648.5,"frost_first":"11/08","frost_last":"03/29","growing_season":224,"warmest_month":7,"coldest_month":1,"wettest_month":7,"driest_month":2,"snowiest_month":1,"comfort_score":78},"data":[{"month":"January","month_number":1,"avg_temp_f":36.2,"avg_high_f":44.7,"avg_low_f":27.8,"precip_in":3.03,"snow_in":4.7,"heating_degree_days":891.3,"cooling_degree_days":0.1,"days_with_precip":9.7,"days_with_snow":2.6,"days_freezing":23,"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":38.6,"avg_high_f":47.8,"avg_low_f":29.5,"precip_in":2.77,"snow_in":2.3,"heating_degree_days":737.8,"cooling_degree_days":0,"days_with_precip":8.5,"days_with_snow":2,"days_freezing":19.9,"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":46.2,"avg_high_f":55.9,"avg_low_f":36.5,"precip_in":3.96,"snow_in":1.4,"heating_degree_days":586.1,"cooling_degree_days":3.3,"days_with_precip":9.8,"days_with_snow":1,"days_freezing":12.4,"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":57,"avg_high_f":67.6,"avg_low_f":46.4,"precip_in":3.44,"snow_in":0,"heating_degree_days":269.2,"cooling_degree_days":29.2,"days_with_precip":11.6,"days_with_snow":0,"days_freezing":1.2,"days_90f_plus":0.5,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"May","month_number":5,"avg_temp_f":66.7,"avg_high_f":76.9,"avg_low_f":56.6,"precip_in":4.32,"snow_in":0,"heating_degree_days":74.8,"cooling_degree_days":129,"days_with_precip":12.3,"days_with_snow":0,"days_freezing":0,"days_90f_plus":3,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"June","month_number":6,"avg_temp_f":75.7,"avg_high_f":85.4,"avg_low_f":66.1,"precip_in":4.56,"snow_in":0,"heating_degree_days":6.7,"cooling_degree_days":329.2,"days_with_precip":11.2,"days_with_snow":0,"days_freezing":0,"days_90f_plus":9.4,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"July","month_number":7,"avg_temp_f":80.3,"avg_high_f":89.8,"avg_low_f":70.9,"precip_in":4.62,"snow_in":0,"heating_degree_days":0,"cooling_degree_days":475.8,"days_with_precip":10.8,"days_with_snow":0,"days_freezing":0,"days_90f_plus":16.8,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"August","month_number":8,"avg_temp_f":78.6,"avg_high_f":88.4,"avg_low_f":68.8,"precip_in":3.67,"snow_in":0,"heating_degree_days":0.2,"cooling_degree_days":421.8,"days_with_precip":9.8,"days_with_snow":0,"days_freezing":0,"days_90f_plus":13.2,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"September","month_number":9,"avg_temp_f":71.6,"avg_high_f":81.7,"avg_low_f":61.5,"precip_in":4.12,"snow_in":0,"heating_degree_days":21.1,"cooling_degree_days":219.1,"days_with_precip":9.7,"days_with_snow":0,"days_freezing":0,"days_90f_plus":4.3,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"October","month_number":10,"avg_temp_f":59.4,"avg_high_f":69.9,"avg_low_f":49,"precip_in":4.23,"snow_in":0,"heating_degree_days":210.3,"cooling_degree_days":38.2,"days_with_precip":9.4,"days_with_snow":0,"days_freezing":0.5,"days_90f_plus":0.2,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"November","month_number":11,"avg_temp_f":48.6,"avg_high_f":58.4,"avg_low_f":38.9,"precip_in":3.2,"snow_in":0,"heating_degree_days":492.4,"cooling_degree_days":1.9,"days_with_precip":8.4,"days_with_snow":0,"days_freezing":7.9,"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":40.6,"avg_high_f":49.2,"avg_low_f":31.9,"precip_in":3.67,"snow_in":1.3,"heating_degree_days":758.6,"cooling_degree_days":0.7,"days_with_precip":9.4,"days_with_snow":1,"days_freezing":19.1,"days_90f_plus":0,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null}]}