Official 1981-2010 Climate Normals City: BROWNSTOWN 4 SW State: IL ID: 111020 Latitude: 38.9544 Longitude: -88.9583 Elevation: 529.7 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 37.3 43.0 53.4 65.2 75.6 85.0 87.9 86.2 80.0 68.2 54.8 41.6 Mean: 29.8 34.8 44.2 55.4 65.5 75.1 77.6 75.3 68.0 56.4 46.0 33.8 Low: 22.3 26.5 35.1 45.6 55.4 65.1 67.2 64.5 56.0 44.7 37.2 26.1 CDD: 0 0 2 27 110 311 389 325 151 25 4 0 HDD: 1091 847 645 315 95 10 0 4 61 290 574 965 Number of Days T090: 0.0 0.0 0.0 0.0 0.8 7.4 11.3 8.3 3.1 0.3 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.3 0.3 0.0 0.0 0.0 0.0 T000: 1.6 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 T032: 23.6 19.6 12.0 1.9 0.1 0.0 0.0 0.0 0.1 2.4 9.4 22.1 ------------------------------------------------------------------------------------------ Annual Values High Temp: 64.9 F Mean Temp: 55.2 F Low Temp: 45.6 F Cooling DD: 1344 Heating DD: 4897 Days above 90 (T090): 31.2 Days above 100 (T100): 0.6 Days below 0 (T000): 2.2 Days below 32 (T032): 91.3 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 2.33 2.44 2.86 3.62 5.43 4.15 3.99 2.98 3.20 2.98 3.95 3.04 Number of Days P001: 9.5 8.0 9.0 10.3 11.6 9.4 7.9 8.2 6.5 7.2 8.6 9.2 P010: 6.4 4.8 6.1 7.2 7.9 7.0 5.8 5.6 4.5 4.8 6.7 5.3 P100: 0.8 0.5 0.6 1.0 1.7 1.4 1.1 0.6 1.0 0.7 1.2 0.4 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 40.97 inches Days precipitation at or above 0 inches (P000): 105.4 Days precipitation at or above 0.10 inches (P010): 72.1 Days Precipitation at or above 1.00 inches (P100): 11.0 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ KEY: High - average daily high temperature, degrees F Mean - average daily mean temperature, degrees F Low - average daily low temperature, degrees F CDD - cooling degree days, base 50F HDD - heating degree days, base 50F T090 - number of Days with Temperatures above 90 degrees F T100 - number of Days with Temperatures above 100 degrees F T000 - number of Days with Temperatures below 0 degrees F T032 - number of Days with Temperatures below 32 degrees F Prcp - precipitation, inches Snow - snowfall, inches P001 - number of Days with Precipitation of 0.01 inches or more P010 - number of Days with Precipitation of 0.10 inches or more P100 - number of Days with Precipitation of 1.00 inches or more S001 - number of Days with Snowfall of 0.1 inches or more S010 - number of Days with Snowfall of 1.0 inches or more S100 - number of Days with Snowfall of 10.0 inches or more Page Source: Dr. Jim Angel, State Climatologist Illinois State Water Survey Prairie Research Institute University of Illinois Data Source: NOAA National Climatic Data Center