Official 1981-2010 Climate Normals
City: MASON CITY 2N
State: IL
ID: 115413
Latitude: 40.2272
Longitude: -89.6947
Elevation: 599.9 ft
Temperature-Related Normals
Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
High: 33.6 38.0 50.9 64.2 73.9 82.9 85.7 84.4 78.5 66.4 51.3 36.9
Mean: 24.8 28.7 40.2 52.8 62.9 72.3 75.2 73.5 66.1 54.5 41.3 28.5
Low: 16.0 19.4 29.5 41.4 51.9 61.8 64.7 62.6 53.6 42.7 31.2 20.1
CDD: 0 0 1 12 73 236 317 269 114 18 0 0
HDD: 1246 1016 770 378 138 15 1 6 82 342 713 1131
Number of Days
T090: 0.0 0.0 0.0 0.0 0.6 4.1 7.1 5.6 2.3 0.1 0.0 0.0
T100: 0.0 0.0 0.0 0.0 0.0 0.1 0.2 0.1 0.0 0.0 0.0 0.0
T000: 4.0 2.2 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2.4
T032: 28.5 25.2 19.1 4.9 0.1 0.0 0.0 0.0 0.2 4.6 16.6 26.0
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Annual Values
High Temp: 62.3 F
Mean Temp: 51.8 F
Low Temp: 41.3 F
Cooling DD: 1041
Heating DD: 5839
Days above 90 (T090): 19.9
Days above 100 (T100): 0.4
Days below 0 (T000): 8.6
Days below 32 (T032): 125.2
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Precipitation-Related Normals
Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Prcp: 1.92 1.61 2.49 3.61 4.07 4.04 4.60 3.29 3.04 2.87 3.11 2.33
Snow: 5.3 4.3 1.4 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.2 3.2
Number of Days
P001: 7.3 7.0 8.2 10.7 11.1 9.8 8.8 7.8 7.0 8.8 8.3 7.3
P010: 3.8 3.8 5.5 6.8 7.8 6.7 6.4 5.5 5.2 5.5 5.9 4.9
P100: 0.3 0.2 0.3 0.4 1.1 1.4 1.2 0.9 0.8 0.4 0.7 0.5
S001: 3.9 2.7 1.2 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.2 3.0
S010: 1.8 1.4 0.7 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.1 1.7
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: 36.98 inches
Snowfall: 14.7 inches
Days precipitation at or above 0 inches (P000): 102.1
Days precipitation at or above 0.10 inches (P010): 67.8
Days Precipitation at or above 1.00 inches (P100): 8.2
Days Snowfall at or above 0.1 inches (S001): 11.2
Days Snowfall at or above 1.0 inches (S010): 5.8
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
