Official 1981-2010 Climate Normals City: GRAYVILLE State: IL ID: 113612 Latitude: 38.2758 Longitude: -87.9989 Elevation: 434.9 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: 40.2 44.6 56.0 67.2 76.5 85.3 88.3 87.8 81.7 70.0 56.6 43.7 Mean: 31.3 35.1 45.0 55.9 65.3 74.5 77.6 76.4 69.1 57.3 46.2 34.5 Low: 22.4 25.5 33.9 44.5 54.1 63.7 66.9 65.0 56.5 44.6 35.8 25.3 CDD: 0 0 3 24 101 290 391 355 163 28 2 0 HDD: 1044 838 624 299 92 5 0 2 40 267 566 945 Number of Days T090: 0.0 0.0 0.0 0.0 1.2 7.6 12.3 10.8 3.3 0.4 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.7 0.0 0.0 0.0 0.0 T000: 0.6 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.6 T032: 25.0 21.5 14.5 2.4 0.1 0.0 0.0 0.0 0.0 2.0 10.6 23.2 ------------------------------------------------------------------------------------------ Annual Values High Temp: 66.6 F Mean Temp: 55.8 F Low Temp: 44.9 F Cooling DD: 1357 Heating DD: 4723 Days above 90 (T090): 35.6 Days above 100 (T100): 0.7 Days below 0 (T000): 1.2 Days below 32 (T032): 99.2 ------------------------------------------------------------------------------------------ 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: 3.07 3.10 4.28 4.35 5.78 3.93 4.08 3.33 3.20 3.67 4.49 3.69 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 46.97 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