Harlan (IA) monthly weather averages

Average daytime temperature

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

Harlan average temperature chart (Celsius) Harlan average temperature chart (Fahrenheit)
Average monthly temperatures in Harlan (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -2.1 1.1 7.9 16.3 22.6 27.7 30 28.3 23.7 17.6 8.4 -0.1
°F 28.2 34 46.2 61.4 72.6 81.9 86 83 74.6 63.7 47.1 31.7

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.

Harlan monthly rainfall chart (mm) Harlan monthly rainfall chart (inches)
Average monthly rainfall in Harlan (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 20 22 53 76 112 115 106 105 93 60 38 25
inches 0.8 0.9 2.1 3 4.4 4.5 4.2 4.1 3.7 2.4 1.5 1
Rainy days 7 7 10 10 12 10 9 9 9 7 7 8

Average annual rainfall in Harlan: 771.933mm (303.9 inches)

Average daily sunshine

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

Harlan average daily sunshine chart
Average daily sunshine Harlan
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 6 6.3 7.2 8.2 9.5 11.1 11.5 10.2 8.6 7.4 5.3 4.8

Day / night temperatures

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

Harlan average minimum / maximum temperatures (Celsius) Harlan average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Harlan (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -13.2 -10.2 -3.8 3 9.5 14.8 17.5 15.8 10.8 4.3 -2.9 -10.3
Max °C -1.9 1.4 8.2 16.7 22.9 28.1 30.3 28.7 24 18 8.7 0.1
Min °F 8.3 13.6 25.2 37.3 49.1 58.6 63.5 60.4 51.4 39.7 26.9 13.5
Max °F 18.5 24.1 36 49.6 61.2 70.5 75 72 63.3 52 37.2 22.8

Sea temperature

The graph below shows the average sea temperature.

Harlan average sea temperature chart (Celsius) Harlan average sea temperature chart (Fahrenheit)
Average sea temperature around Harlan in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 9.3 9 9.5 10.6 12.4 14.7 17.2 19.8 18.6 15.3 12.3 10.3
°F 48.7 48.2 49.1 51.1 54.3 58.4 63 67.6 65.6 59.5 54.2 50.6

Wind speed

The graph below shows the average wind speed.

Harlan average winspeed by month (km/h) Harlan average winspeed by month (mph)
Average wind speed in Harlan (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 19 19 21 21 18 17 15 15 16 17 18 18
mph 12 12 13 13 11 11 9 9 10 11 11 11

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.

Harlan relative humidity averages
Average relative humidity in Harlan
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
71% 71% 67% 62% 64% 66% 68% 71% 72% 67% 72% 75%

Other monthly averages

UV index Best time to go?

Harlan weather stats

Harlan weather statistics
Hottest month: July 30°C 86°F
Driest month: January 20mm 0.8ins
Sunniest month: July 11.5hrs
Coldest month: January -2.1°C 28.2°F
Wettest month: June 115mm 4.5ins
Warmest sea: August 19.8°C 67.6°F
Map showing location of Harlan (41.65304, -95.32555) Harlan map pin © Google

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