Official 1981-2010 Climate Normals City: JACKSONVILLE 2E State: IL ID: 114442 Latitude: 39.7347 Longitude: -90.1978 Elevation: 609.8 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 35.5 40.6 52.2 64.7 74.4 83.0 86.4 85.1 79.3 67.2 53.2 39.2 Mean: 26.4 30.5 40.7 52.1 62.1 71.2 74.8 73.0 65.7 54.2 42.5 29.9 Low: 17.2 20.4 29.3 39.6 49.9 59.4 63.2 60.9 52.1 41.2 31.8 20.6 CDD: 0 0 2 13 64 207 306 257 111 17 1 0 HDD: 1198 966 753 398 153 22 2 9 90 351 676 1088 Number of Days T090: 0.0 0.0 0.0 0.0 0.6 4.4 8.2 6.8 2.7 0.1 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: 3.1 1.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.9 T032: 28.2 24.1 19.6 6.2 0.3 0.0 0.0 0.0 0.4 5.8 15.8 26.7 ------------------------------------------------------------------------------------------ Annual Values High Temp: 63.5 F Mean Temp: 52.0 F Low Temp: 40.6 F Cooling DD: 977 Heating DD: 5706 Days above 90 (T090): 22.9 Days above 100 (T100): 0.5 Days below 0 (T000): 6.7 Days below 32 (T032): 127.1 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.59 1.69 2.72 4.03 4.81 4.58 3.95 3.42 3.53 3.01 3.62 2.50 Snow: 4.5 4.6 2.3 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.5 5.2 Number of Days P001: 6.7 6.7 9.9 11.7 12.2 9.9 8.3 8.3 7.9 9.7 9.6 8.4 P010: 3.6 3.6 6.1 7.5 8.2 6.5 5.9 5.5 5.4 6.1 6.1 4.7 P100: 0.3 0.4 0.4 0.9 1.4 1.5 1.2 1.1 1.0 0.6 1.0 0.6 S001: 3.7 2.7 1.1 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.2 3.4 S010: 2.1 1.8 0.8 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.2 2.3 S100: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 39.45 inches Snowfall: 17.4 inches Days precipitation at or above 0 inches (P000): 109.3 Days precipitation at or above 0.10 inches (P010): 69.2 Days Precipitation at or above 1.00 inches (P100): 10.4 Days Snowfall at or above 0.1 inches (S001): 11.3 Days Snowfall at or above 1.0 inches (S010): 7.3 Days Snowfall at or above 10.0 inches (S100): 0.0 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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