Marshalltown (IA) monthly weather averages

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Marshalltown

Marshalltown average temperature chart (Celsius) Marshalltown average temperature chart (Fahrenheit)
Average monthly temperatures in Marshalltown (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -3.3 -0.2 6.9 15.3 22 27.2 29.5 28 23.6 17.2 7.9 -0.8
°F 26.1 31.6 44.4 59.5 71.6 81 85.1 82.4 74.4 63 46.3 30.6

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Marshalltown monthly rainfall chart (mm) Marshalltown monthly rainfall chart (inches)
Average monthly rainfall in Marshalltown (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 22 27 57 81 99 119 105 118 94 64 44 32
inches 0.9 1.1 2.2 3.2 3.9 4.7 4.1 4.6 3.7 2.5 1.7 1.3
Rainy days 8 7 10 11 11 10 10 9 9 8 8 9

Average annual rainfall in Marshalltown: 811.066mm (319.3 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Marshalltown

Marshalltown average daily sunshine chart
Average daily sunshine Marshalltown
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5.7 6.7 7.3 8.2 9.6 10.9 11.3 10.1 8.4 7.2 4.9 4.6

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Marshalltown average minimum / maximum temperatures (Celsius) Marshalltown average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Marshalltown (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -13.8 -11.3 -4 2.8 9.1 14.5 17 15.3 10.3 3.9 -2.8 -10.5
Max °C -3 0.1 7.2 15.6 22.3 27.6 29.8 28.3 23.9 17.6 8.2 -0.6
Min °F 7.2 11.8 24.9 37 48.4 58 62.6 59.5 50.5 38.9 27 13.2
Max °F 16.9 21.9 34.9 48.6 60.3 69.8 74.1 71.2 62.8 51.3 36.9 22.1

Sea temperature

The graph below shows the average sea temperature.

Marshalltown average sea temperature chart (Celsius) Marshalltown average sea temperature chart (Fahrenheit)
Average sea temperature around Marshalltown in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 8.2 7.9 8.4 9.6 11.3 13.6 16.3 19.3 18.2 14.6 11.4 9.4
°F 46.8 46.3 47.2 49.2 52.4 56.4 61.3 66.8 64.8 58.2 52.6 48.9

Wind speed

The graph below shows the average wind speed.

Marshalltown average winspeed by month (km/h) Marshalltown average winspeed by month (mph)
Average wind speed in Marshalltown (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 20 19 22 22 19 17 15 15 16 18 19 19
mph 12 12 14 14 12 11 9 9 10 11 12 12

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Marshalltown relative humidity averages
Average relative humidity in Marshalltown
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
72% 73% 71% 65% 65% 67% 70% 72% 73% 69% 73% 76%

Other monthly averages

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Marshalltown weather stats

Marshalltown weather statistics
Hottest month: July 29.5°C 85.1°F
Driest month: January 22mm 0.9ins
Sunniest month: July 11.3hrs
Coldest month: January -3.3°C 26.1°F
Wettest month: June 119mm 4.7ins
Warmest sea: August 19.3°C 66.7°F
Map showing location of Marshalltown (42.04943, -92.90798) Marshalltown map pin © Google

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