Official 1981-2010 Climate Normals City: OLIVE BRANCH State: IL ID: 116383 Latitude: 37.1742 Longitude: -89.3506 Elevation: 339.8 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 43.7 49.2 59.3 69.9 78.3 86.1 88.7 88.0 81.6 72.0 57.8 46.0 Mean: 34.5 39.3 48.0 58.1 66.9 75.1 78.2 77.3 69.7 59.3 47.9 36.9 Low: 25.4 29.4 36.7 46.3 55.6 64.1 67.6 66.6 57.8 46.7 38.0 27.8 CDD: 0 0 3 30 123 307 408 382 175 35 2 0 HDD: 944 720 530 237 63 4 0 1 34 210 515 871 Number of Days T090: 0.0 0.0 0.0 0.1 1.6 8.5 13.3 11.2 2.7 0.0 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.0 0.0 0.0 0.0 T000: 0.6 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.3 T032: 23.0 16.6 10.6 2.1 0.0 0.0 0.0 0.0 0.0 1.9 9.5 20.0 ------------------------------------------------------------------------------------------ Annual Values High Temp: 68.5 F Mean Temp: 57.7 F Low Temp: 46.9 F Cooling DD: 1465 Heating DD: 4128 Days above 90 (T090): 37.4 Days above 100 (T100): 0.2 Days below 0 (T000): 1.2 Days below 32 (T032): 83.7 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 3.54 3.89 4.49 5.04 4.91 4.50 3.39 2.68 3.36 4.09 4.88 3.83 Number of Days P001: 9.3 8.9 10.8 10.1 10.0 9.7 6.9 5.2 7.3 7.8 9.3 9.5 P010: 6.2 6.6 7.5 7.3 6.9 7.2 5.2 3.5 4.9 5.7 6.4 6.3 P100: 0.7 1.8 1.2 1.6 1.3 1.5 0.8 0.6 1.1 1.3 1.9 0.7 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 48.60 inches Days precipitation at or above 0 inches (P000): 104.8 Days precipitation at or above 0.10 inches (P010): 73.7 Days Precipitation at or above 1.00 inches (P100): 14.5 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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