{"metadata":{"title":"Chicago Waukegan Rgnl, IL Monthly Climate Normals","page_url":"https://plainclimate.com/city/chicago-waukegan-rgnl-il","primary_station_id":"USW00014880","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, \"Chicago Waukegan Rgnl, IL Climate Normals\". https://plainclimate.com/city/chicago-waukegan-rgnl-il","row_count":12},"annual_summary":{"city_slug":"chicago-waukegan-rgnl-il","ann_tavg":48.3,"ann_tmax":57.2,"ann_tmin":39.3,"ann_prcp":35.3,"ann_snow":null,"ann_htdd":6687.9,"ann_cldd":626,"frost_first":"10/21","frost_last":"04/30","growing_season":174,"warmest_month":7,"coldest_month":1,"wettest_month":6,"driest_month":1,"snowiest_month":null,"comfort_score":64},"data":[{"month":"January","month_number":1,"avg_temp_f":23.4,"avg_high_f":30.9,"avg_low_f":16,"precip_in":1.41,"snow_in":null,"heating_degree_days":1287.9,"cooling_degree_days":0,"days_with_precip":8.1,"days_with_snow":null,"days_freezing":28.2,"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":26.3,"avg_high_f":34.1,"avg_low_f":18.4,"precip_in":1.52,"snow_in":null,"heating_degree_days":1084.9,"cooling_degree_days":0,"days_with_precip":8.6,"days_with_snow":null,"days_freezing":26,"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":35.6,"avg_high_f":44.3,"avg_low_f":26.9,"precip_in":2.22,"snow_in":null,"heating_degree_days":912.2,"cooling_degree_days":0.8,"days_with_precip":10.5,"days_with_snow":null,"days_freezing":21.9,"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":45.8,"avg_high_f":55.5,"avg_low_f":36,"precip_in":3.77,"snow_in":null,"heating_degree_days":581.1,"cooling_degree_days":3.7,"days_with_precip":12,"days_with_snow":null,"days_freezing":9.3,"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":56.3,"avg_high_f":66.6,"avg_low_f":45.9,"precip_in":3.92,"snow_in":null,"heating_degree_days":298.1,"cooling_degree_days":26.9,"days_with_precip":13.6,"days_with_snow":null,"days_freezing":0.9,"days_90f_plus":0.2,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"June","month_number":6,"avg_temp_f":66.3,"avg_high_f":76.6,"avg_low_f":56.1,"precip_in":4.45,"snow_in":null,"heating_degree_days":72.6,"cooling_degree_days":113,"days_with_precip":12,"days_with_snow":null,"days_freezing":0,"days_90f_plus":1.8,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"July","month_number":7,"avg_temp_f":71.6,"avg_high_f":81.3,"avg_low_f":61.9,"precip_in":3.48,"snow_in":null,"heating_degree_days":13.2,"cooling_degree_days":217.7,"days_with_precip":10,"days_with_snow":null,"days_freezing":0,"days_90f_plus":3.9,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"August","month_number":8,"avg_temp_f":70.5,"avg_high_f":80,"avg_low_f":61.1,"precip_in":3.59,"snow_in":null,"heating_degree_days":12.4,"cooling_degree_days":184.4,"days_with_precip":12.6,"days_with_snow":null,"days_freezing":0,"days_90f_plus":2.5,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"September","month_number":9,"avg_temp_f":63.4,"avg_high_f":73.1,"avg_low_f":53.6,"precip_in":3.57,"snow_in":null,"heating_degree_days":120.6,"cooling_degree_days":71,"days_with_precip":11.6,"days_with_snow":null,"days_freezing":0,"days_90f_plus":0.5,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null},{"month":"October","month_number":10,"avg_temp_f":51.8,"avg_high_f":60.9,"avg_low_f":42.7,"precip_in":3.25,"snow_in":null,"heating_degree_days":417.5,"cooling_degree_days":8.4,"days_with_precip":11.6,"days_with_snow":null,"days_freezing":4,"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":39.5,"avg_high_f":47.5,"avg_low_f":31.4,"precip_in":2.26,"snow_in":null,"heating_degree_days":766.7,"cooling_degree_days":0.2,"days_with_precip":9.6,"days_with_snow":null,"days_freezing":15.8,"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":28.9,"avg_high_f":35.9,"avg_low_f":21.8,"precip_in":1.86,"snow_in":null,"heating_degree_days":1120.6,"cooling_degree_days":0,"days_with_precip":8.9,"days_with_snow":null,"days_freezing":26,"days_90f_plus":0,"humidity_pct":null,"wind_speed_mph":null,"clear_sky_pct":null,"overcast_pct":null}]}