Official 1981-2010 Climate Normals
City: MT VERNON 3
State: IL
ID: 115943
Latitude: 38.3483
Longitude: -88.8533
Elevation: 490.0 ft
Temperature-Related Normals
Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
High: 38.1 43.1 53.5 64.9 73.8 82.9 86.3 85.6 78.6 67.4 54.5 41.3
Mean: 29.5 33.6 43.5 54.2 63.7 72.9 76.6 75.1 67.2 55.6 44.7 32.6
Low: 20.9 24.2 33.4 43.6 53.6 62.9 66.9 64.6 55.8 43.8 34.8 23.9
CDD: 0 0 2 18 79 249 360 316 134 20 1 0
HDD: 1100 878 670 341 120 12 1 3 68 311 612 1004
Number of Days
T090: 0.0 0.0 0.0 0.0 0.1 3.7 7.5 7.5 2.1 0.1 0.0 0.0
T100: 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.2 0.0 0.0 0.0 0.0
T000: 1.4 0.8 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.1
T032: 26.0 21.6 14.8 3.6 0.0 0.0 0.0 0.0 0.1 4.3 12.6 23.9
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Annual Values
High Temp: 64.3 F
Mean Temp: 54.2 F
Low Temp: 44.1 F
Cooling DD: 1179
Heating DD: 5119
Days above 90 (T090): 21.0
Days above 100 (T100): 0.4
Days below 0 (T000): 3.3
Days below 32 (T032): 106.8
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Precipitation-Related Normals
Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Prcp: 2.34 2.85 3.87 4.36 5.16 3.88 3.68 2.96 3.22 3.65 4.21 3.22
Snow: 3.6 4.7 1.3 0.2 0.0 0.0 0.0 0.0 0.0 0.2 0.3 3.6
Number of Days
P001: 8.2 8.3 10.8 11.3 12.6 10.3 8.5 7.8 7.8 9.0 10.2 10.1
P010: 4.6 5.1 6.8 7.7 8.0 6.8 5.5 4.6 4.8 5.9 6.9 6.2
P100: 0.5 0.7 1.0 1.2 1.3 1.0 1.4 0.9 0.8 1.0 1.3 0.7
S001: 2.4 2.0 0.6 0.1 0.0 0.0 0.0 0.0 0.0 0.1 0.2 1.5
S010: 1.6 1.5 0.4 0.1 0.0 0.0 0.0 0.0 0.0 0.1 0.1 1.1
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
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Annual Values
Precipitation: 43.40 inches
Snowfall: 13.9 inches
Days precipitation at or above 0 inches (P000): 114.9
Days precipitation at or above 0.10 inches (P010): 72.9
Days Precipitation at or above 1.00 inches (P100): 11.8
Days Snowfall at or above 0.1 inches (S001): 6.9
Days Snowfall at or above 1.0 inches (S010): 4.9
Days Snowfall at or above 10.0 inches (S100): 0.0
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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
