Official 1981-2010 Climate Normals City: PRAIRIE CITY 2S State: IL ID: 116970 Latitude: 40.5914 Longitude: -90.4642 Elevation: 649.8 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: 33.6 38.6 50.6 64.1 73.6 83.0 86.5 84.9 77.8 66.2 52.2 37.1 Mean: 24.4 28.7 39.6 52.5 62.6 72.2 75.6 73.9 66.1 54.5 41.6 28.4 Low: 15.2 18.7 28.6 40.8 51.5 61.4 64.6 62.8 54.3 42.8 31.0 19.6 CDD: 0 0 0 10 59 229 328 280 102 18 0 0 HDD: 1258 1017 788 387 134 13 1 6 71 344 702 1136 Number of Days T090: 0.0 0.0 0.0 0.0 0.4 4.3 9.3 6.5 1.5 0.3 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.1 0.3 0.1 0.0 0.0 0.0 0.0 T000: 4.0 1.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.3 T032: 29.0 25.1 21.4 5.2 0.0 0.0 0.0 0.0 0.0 3.0 17.4 27.8 ------------------------------------------------------------------------------------------ Annual Values High Temp: 62.5 F Mean Temp: 51.7 F Low Temp: 41.0 F Cooling DD: 1025 Heating DD: 5856 Days above 90 (T090): 22.2 Days above 100 (T100): 0.5 Days below 0 (T000): 6.4 Days below 32 (T032): 128.9 ------------------------------------------------------------------------------------------ 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: 1.73 1.77 2.74 3.59 4.51 4.49 4.37 3.86 3.50 3.02 2.81 2.18 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 38.57 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