Waterloo Weather History (IA)

Summary
  Temp.
(ºF)
Relative Humidity
(Percentage)
Extreme Temp.
(Days Per Month)
Rain
(Inches)
Cloudiness
(Days Per Month)
  Average A.M. P.M. Below
32º
Above
90º
Average Clear Partly
Cloudy
Cloudy
January 14.6 78% 71% 31 0 0.8 8 7 16
February 20.1 80% 70% 27 0 1.1 7 6 15
March 34.2 82% 67% 24 0 2.3 6 7 18
April 48.3 81% 58% 11 N/A 3.3 6 8 16
May 60.2 81% 57% 1 1 4.1 7 9 14
June 69.1 84% 58% 0 4 4.5 7 11 12
July 73.1 87% 62% 0 6 4.8 9 12 11
August 70.3 90% 63% 0 4 3.6 9 11 11
September 61.9 89% 62% 1 1 3.5 10 8 12
October 50.1 83% 59% 9 N/A 2.6 10 8 14
November 35.7 83% 68% 22 0 1.8 5 7 18
December 20.3 82% 73% 30 0 1.3 7 6 18
Annual 46.5 83% 64% 155 16 33.7 91 100 174


Average Temperature (ºF)
Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.
14.6 20.1 34.2 48.3 60.2 69.1 73.1 70.3 61.9 50.1 35.7 20.3

Relative Humidity (Percentage)
Morning
Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.
78% 80% 82% 81% 81% 84% 87% 90% 89% 83% 83% 82%
Afternoon
71% 70% 67% 58% 57% 58% 62% 63% 62% 59% 68% 73%

Rain (Inches)
Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.
0.8 1.1 2.3 3.3 4.1 4.5 4.8 3.6 3.5 2.6 1.8 1.3

Cloudiness (Days Per Month)
  January February March
Clear 8 Days 7 Days 6 Days
Partly Cloudy 7 Days 6 Days 7 Days
Cloudy 16 Days 18 Days 18 Days
  April May June
Clear 6 Days 7 Days 7 Days
Partly Cloudy 8 Days 9 Days 11 Days
Cloudy 16 Days 14 Days 12 Days
  July August September
Clear 9 Days 9 Days 10 Days
Partly Cloudy 12 Days 11 Days 8 Days
Cloudy 11 Days 11 Days 12 Days
  October November December
Clear 10 Days 5 Days 7 Days
Partly Cloudy 8 Days 7 Days 6 Days
Cloudy 14 Days 18 Days 18 Days
  Clear Partly Cloudy Cloudy
 
Days Per Year 91 100 174


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