Lewistown (IL) monthly weather averages

Contents

Average daytime temperature

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

Lewistown average temperature chart (Celsius) Lewistown average temperature chart (Fahrenheit)
Average monthly temperatures in Lewistown (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -0.7 2 9.1 17 22.8 28.1 30.1 28.7 25 18.4 10.2 1.9
°F 30.7 35.5 48.5 62.5 73 82.5 86.1 83.6 77.1 65.2 50.3 35.4

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.

Lewistown monthly rainfall chart (mm) Lewistown monthly rainfall chart (inches)
Average monthly rainfall in Lewistown (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 39 39 78 99 106 101 106 91 97 74 66 61
inches 1.5 1.5 3.1 3.9 4.2 4 4.2 3.6 3.8 2.9 2.6 2.4
Rainy days 9 8 11 11 11 9 9 9 9 8 9 10

Average annual rainfall in Lewistown: 908.734mm (357.8 inches)

Average daily sunshine

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

Lewistown average daily sunshine chart
Average daily sunshine Lewistown
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5.5 6.1 6.5 7.9 9.3 10.8 10.8 9.7 8.5 7.2 4.9 4.4

Day / night temperatures

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

Lewistown average minimum / maximum temperatures (Celsius) Lewistown average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Lewistown (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -10.3 -8 -1.4 5 10.5 15.9 18.3 16.9 12.5 6.1 0 -6.9
Max °C -0.5 2.2 9.4 17.3 23.1 28.4 30.4 29 25.4 18.8 10.4 2.1
Min °F 13.5 17.6 29.5 40.9 50.9 60.5 64.9 62.3 54.4 42.9 32 19.6
Max °F 22.3 26.8 39.2 52 62.2 71.8 75.7 73.2 66 54.3 41.4 27.7

Sea temperature

The graph below shows the average sea temperature.

Lewistown average sea temperature chart (Celsius) Lewistown average sea temperature chart (Fahrenheit)
Average sea temperature around Lewistown in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 8.6 8.2 8.5 9.7 11.6 14.1 17.5 21 19.6 15.3 12 9.9
°F 47.4 46.7 47.4 49.4 52.8 57.4 63.6 69.8 67.2 59.5 53.7 49.8

Wind speed

The graph below shows the average wind speed.

Lewistown average winspeed by month (km/h) Lewistown average winspeed by month (mph)
Average wind speed in Lewistown (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 19 19 21 21 17 16 14 13 14 17 18 19
mph 12 12 13 13 11 10 9 8 9 10 11 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.

Lewistown relative humidity averages
Average relative humidity in Lewistown
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
73% 73% 70% 65% 66% 67% 71% 73% 73% 69% 74% 77%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Lewistown weather stats

Lewistown weather statistics
Hottest month: July 30.1°C 86.2°F
Driest month: February 39mm 1.5ins
Sunniest month: July 10.8hrs
Coldest month: January -0.7°C 30.7°F
Wettest month: July 106mm 4.2ins
Warmest sea: August 21°C 69.8°F
Map showing location of Lewistown (40.3931, -90.15484) Lewistown map pin © Google

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