Official 1981-2010 Climate Normals
City: MORRISON
State: IL
ID: 115833
Latitude: 41.8039
Longitude: -89.9744
Elevation: 602.9 ft
Temperature-Related Normals
Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
High: 30.9 35.9 48.2 61.8 72.7 82.0 85.4 83.3 76.4 63.9 49.2 35.0
Mean: 21.6 26.3 37.9 49.9 60.9 70.3 73.9 71.8 63.7 51.6 39.4 26.1
Low: 12.3 16.6 27.6 38.0 49.0 58.6 62.4 60.3 50.9 39.4 29.5 17.1
CDD: 0 0 0 8 51 185 279 221 78 7 0 0
HDD: 1345 1085 841 461 180 26 3 10 119 421 770 1207
Number of Days
T090: 0.0 0.0 0.0 0.1 0.7 4.1 7.2 4.6 1.4 0.0 0.0 0.0
T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.2 0.0 0.0 0.0 0.0
T000: 6.1 3.7 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 3.4
T032: 29.9 25.7 21.8 6.9 0.5 0.0 0.0 0.0 0.4 7.1 18.5 28.1
------------------------------------------------------------------------------------------
Annual Values
High Temp: 60.5 F
Mean Temp: 49.5 F
Low Temp: 38.6 F
Cooling DD: 830
Heating DD: 6467
Days above 90 (T090): 18.0
Days above 100 (T100): 0.4
Days below 0 (T000): 13.3
Days below 32 (T032): 138.9
------------------------------------------------------------------------------------------
Precipitation-Related Normals
Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Prcp: 1.48 1.69 2.68 3.48 4.20 4.83 3.94 4.70 2.96 2.97 2.74 2.09
Snow: 10.4 6.1 3.2 1.0 0.0 0.0 0.0 0.0 0.0 0.0 1.7 7.9
Number of Days
P001: 7.6 6.3 8.4 10.4 10.9 9.8 8.8 9.0 7.7 8.2 8.6 8.4
P010: 4.0 3.9 5.4 6.6 7.9 7.0 6.0 6.9 5.2 5.3 5.6 5.0
P100: 0.1 0.4 0.5 0.8 1.0 1.4 1.2 1.5 0.9 0.7 0.5 0.4
S001: 4.9 3.1 1.5 0.4 0.0 0.0 0.0 0.0 0.0 0.0 1.0 4.6
S010: 4.0 2.6 1.3 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.8 4.0
S100: 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
------------------------------------------------------------------------------------------
Annual Values
Precipitation: 37.76 inches
Snowfall: 30.3 inches
Days precipitation at or above 0 inches (P000): 104.1
Days precipitation at or above 0.10 inches (P010): 68.8
Days Precipitation at or above 1.00 inches (P100): 9.4
Days Snowfall at or above 0.1 inches (S001): 15.5
Days Snowfall at or above 1.0 inches (S010): 13.0
Days Snowfall at or above 10.0 inches (S100): 0.1
------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------
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
