McHenry Climate Normals

Official 1981-2010 Climate Normals

City: MCHENRY-WG STRATTON LD
State: IL
ID: 115493
Latitude: 42.3103
Longitude: -88.2525
Elevation:  741.9 ft

Temperature-Related Normals

Normal    Jan    Feb    Mar    Apr    May    Jun    Jul    Aug    Sep    Oct    Nov    Dec
High:    28.3   33.0   44.2   57.3   68.4   78.2   81.7   80.4   73.3   60.8   46.4   32.2
Mean:    20.1   24.5   35.1   47.2   57.7   67.3   71.4   70.1   62.3   49.7   38.0   24.6
 Low:    11.9   16.1   26.1   37.0   47.0   56.3   61.1   59.7   51.2   38.6   29.6   17.1
 CDD:       0      0      0      5     35    129    211    176     60      5      0      0
 HDD:    1392   1132    926    540    261     62     13     19    143    480    810   1250

Number of Days
T090:     0.0    0.0    0.0    0.0    0.4    1.7    2.5    2.1    0.6    0.0    0.0    0.0
T100:     0.0    0.0    0.0    0.0    0.0    0.0    0.1    0.0    0.0    0.0    0.0    0.0
T000:     5.9    3.6    0.2    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    3.2
T032:    30.2   25.8   22.7    8.9    0.8    0.0    0.0    0.0    0.2    7.9   18.0   28.1
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Annual Values

 High Temp:    57.1 F
 Mean Temp:    47.4 F
  Low Temp:    37.8 F
Cooling DD:     621
Heating DD:    7027

Days above  90 (T090):     7.2
Days above 100 (T100):     0.1
Days below   0 (T000):    13.0
Days below  32 (T032):   142.6
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Precipitation-Related Normals

Normal    Jan    Feb    Mar    Apr    May    Jun    Jul    Aug    Sep    Oct    Nov    Dec
Prcp:    1.39   1.43   2.03   3.26   4.09   4.10   3.90   4.16   3.07   2.93   2.66   1.87
Snow:    10.9    8.1    4.1    0.7    0.0    0.0    0.0    0.0    0.0    0.0    1.3    9.2

Number of Days
P001:     8.3    7.5    8.7   10.7   12.3   11.2    9.4    9.8    9.1    9.4    9.2    9.3
P010:     3.9    3.9    4.4    7.0    7.8    7.3    5.8    6.2    5.4    5.8    5.2    4.6
P100:     0.1    0.2    0.2    0.7    0.8    1.1    1.1    1.2    0.8    0.7    0.5    0.2
S001:     6.7    5.2    3.0    0.4    0.0    0.0    0.0    0.0    0.0    0.0    1.3    6.2
S010:     3.6    2.7    1.4    0.3    0.0    0.0    0.0    0.0    0.0    0.0    0.5    2.8
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:   34.89 inches
     Snowfall:    34.3 inches

   Days precipitation at or above 0 inches (P000):   114.9
Days precipitation at or above 0.10 inches (P010):    67.3
Days Precipitation at or above 1.00 inches (P100):     7.6
      Days Snowfall at or above 0.1 inches (S001):    22.8
      Days Snowfall at or above 1.0 inches (S010):    11.3
     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