Official 1981-2010 Climate Normals City: JACKSONVILLE 2 State: IL ID: 114447 Latitude: 39.7136 Longitude: -90.2289 Elevation: 599.9 ft Temperature-Related Pseudonormals For stations with short records, linear combinations of normals from nearby sites were used to compute so-called pseudonormals. Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 35.8 40.9 52.6 65.2 75.4 83.8 88.1 86.6 79.8 67.6 53.2 39.1 Mean: 26.9 30.9 41.7 53.7 63.9 73.0 77.1 75.3 67.3 55.3 43.1 30.4 Low: 18.0 20.9 30.7 42.2 52.3 62.1 66.0 63.9 54.7 42.9 32.9 21.7 CDD: 0 0 2 15 67 244 374 319 123 24 0 0 HDD: 1181 954 726 354 102 6 0 1 56 326 659 1072 Number of Days T090: 0.0 0.0 0.0 0.2 1.0 3.7 9.8 8.8 2.2 0.4 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.2 0.2 0.0 0.0 0.0 T000: 2.3 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.8 T032: 26.5 25.0 18.3 3.2 0.0 0.0 0.0 0.0 0.0 2.4 14.8 27.0 ------------------------------------------------------------------------------------------ Annual Values High Temp: 64.1 F Mean Temp: 53.3 F Low Temp: 42.5 F Cooling DD: 1167 Heating DD: 5438 Days above 90 (T090): 26.1 Days above 100 (T100): 0.6 Days below 0 (T000): 3.3 Days below 32 (T032): 117.2 ------------------------------------------------------------------------------------------ Precipitation-Related Pseudonormals For stations with short records, linear combinations of normals from nearby sites were used to compute so-called pseudonormals. Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 2.04 1.93 3.06 3.93 4.51 4.48 3.86 3.51 3.68 3.19 3.47 2.74 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 40.40 inches ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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