{"metadata":{"title":"Wheaton, IL Monthly Climate Normals","page_url":"https://plainclimate.com/city/wheaton-il","primary_station_id":"USC00119221","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, \"Wheaton, IL Climate Normals\". https://plainclimate.com/city/wheaton-il","row_count":12},"annual_summary":{"city_slug":"wheaton-il","ann_tavg":51.1,"ann_tmax":61.6,"ann_tmin":40.6,"ann_prcp":39.9,"ann_snow":24.3,"ann_htdd":5975.5,"ann_cldd":938,"frost_first":"10/17","frost_last":"04/27","growing_season":173,"warmest_month":7,"coldest_month":1,"wettest_month":6,"driest_month":2,"snowiest_month":1,"comfort_score":59},"data":[{"month":"January","month_number":1,"avg_temp_f":24.8,"avg_high_f":32.8,"avg_low_f":16.8,"precip_in":2.12,"snow_in":9.3,"heating_degree_days":1245.8,"cooling_degree_days":0,"days_with_precip":10.9,"days_with_snow":5.7,"days_freezing":27.6,"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":28.6,"avg_high_f":37.5,"avg_low_f":19.8,"precip_in":1.96,"snow_in":5.1,"heating_degree_days":1017.6,"cooling_degree_days":0,"days_with_precip":8,"days_with_snow":3.5,"days_freezing":23.7,"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":39,"avg_high_f":49.5,"avg_low_f":28.5,"precip_in":2.46,"snow_in":4.5,"heating_degree_days":806.5,"cooling_degree_days":0.4,"days_with_precip":9.3,"days_with_snow":2.3,"days_freezing":21.6,"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":50.4,"avg_high_f":62.5,"avg_low_f":38.3,"precip_in":4.1,"snow_in":0.3,"heating_degree_days":447.6,"cooling_degree_days":9.6,"days_with_precip":11.5,"days_with_snow":0.1,"days_freezing":8,"days_90f_plus":0.3,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"May","month_number":5,"avg_temp_f":61.1,"avg_high_f":73.6,"avg_low_f":48.7,"precip_in":4.46,"snow_in":0,"heating_degree_days":181.7,"cooling_degree_days":62.3,"days_with_precip":12.2,"days_with_snow":0,"days_freezing":1.3,"days_90f_plus":1.5,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"June","month_number":6,"avg_temp_f":70.7,"avg_high_f":82.9,"avg_low_f":58.5,"precip_in":4.65,"snow_in":0,"heating_degree_days":30.7,"cooling_degree_days":201.5,"days_with_precip":10.1,"days_with_snow":0,"days_freezing":0,"days_90f_plus":8.1,"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":85.5,"avg_low_f":63.1,"precip_in":3.86,"snow_in":0,"heating_degree_days":2.3,"cooling_degree_days":290.5,"days_with_precip":8.9,"days_with_snow":0,"days_freezing":0,"days_90f_plus":10,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"August","month_number":8,"avg_temp_f":72.9,"avg_high_f":83.7,"avg_low_f":62.1,"precip_in":4.4,"snow_in":0,"heating_degree_days":5.7,"cooling_degree_days":250.5,"days_with_precip":9.3,"days_with_snow":0,"days_freezing":0,"days_90f_plus":7,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"September","month_number":9,"avg_temp_f":65.9,"avg_high_f":78,"avg_low_f":53.8,"precip_in":3.3,"snow_in":0,"heating_degree_days":81.2,"cooling_degree_days":108,"days_with_precip":8,"days_with_snow":0,"days_freezing":0.3,"days_90f_plus":2.4,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"October","month_number":10,"avg_temp_f":54,"avg_high_f":65.2,"avg_low_f":42.9,"precip_in":3.56,"snow_in":0,"heating_degree_days":354.4,"cooling_degree_days":14.9,"days_with_precip":8.7,"days_with_snow":0,"days_freezing":5.1,"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":41,"avg_high_f":50.1,"avg_low_f":31.8,"precip_in":2.81,"snow_in":0.9,"heating_degree_days":721.7,"cooling_degree_days":0.2,"days_with_precip":10,"days_with_snow":0.7,"days_freezing":15.6,"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":30.2,"avg_high_f":37.7,"avg_low_f":22.6,"precip_in":2.22,"snow_in":4.2,"heating_degree_days":1080.2,"cooling_degree_days":0,"days_with_precip":9.2,"days_with_snow":3.1,"days_freezing":25,"days_90f_plus":0,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null}]}