Merrillville (IN) monthly weather averages

Average daytime temperature

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

Merrillville average temperature chart (Celsius) Merrillville average temperature chart (Fahrenheit)
Average monthly temperatures in Merrillville (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -1.3 1.1 7.7 15 21.4 27 28.8 27.6 23.7 17.1 8.9 1.5
°F 29.7 33.9 45.9 59 70.5 80.7 83.8 81.6 74.7 62.8 48.1 34.7

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.

Merrillville monthly rainfall chart (mm) Merrillville monthly rainfall chart (inches)
Average monthly rainfall in Merrillville (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 44 38 65 98 93 106 99 90 92 72 77 62
inches 1.7 1.5 2.5 3.8 3.7 4.2 3.9 3.5 3.6 2.8 3 2.4
Rainy days 12 10 13 13 11 10 10 9 9 9 11 13

Average annual rainfall in Merrillville: 888.567mm (349.8 inches)

Average daily sunshine

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

Merrillville average daily sunshine chart
Average daily sunshine Merrillville
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 4.8 5.5 6.5 7.9 9.7 11.1 11 9.9 8.3 6.8 4.2 3.7

Day / night temperatures

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

Merrillville average minimum / maximum temperatures (Celsius) Merrillville average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Merrillville (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -10.6 -8.5 -2.4 3.1 8.5 13.9 16.5 15.4 11.4 5 -0.2 -6.9
Max °C -1.1 1.3 8 15.3 21.7 27.4 29.1 27.9 24.1 17.4 9.2 1.7
Min °F 13 16.7 27.8 37.6 47.3 56.9 61.7 59.6 52.4 41 31.7 19.6
Max °F 21.6 25.5 37 48.6 59.2 69.1 73 70.9 63.9 52.2 40.1 27.3

Sea temperature

The graph below shows the average sea temperature.

Merrillville average sea temperature chart (Celsius) Merrillville average sea temperature chart (Fahrenheit)
Average sea temperature around Merrillville in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 4.4 3.6 3.5 4.5 6.9 12.5 19.3 21.8 19.7 14.3 9.4 6
°F 39.9 38.5 38.4 40.1 44.4 54.6 66.7 71.3 67.5 57.7 48.9 42.9

Wind speed

The graph below shows the average wind speed.

Merrillville average winspeed by month (km/h) Merrillville average winspeed by month (mph)
Average wind speed in Merrillville (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 20 19 21 20 17 16 14 14 15 17 18 19
mph 12 12 13 13 11 10 9 9 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.

Merrillville relative humidity averages
Average relative humidity in Merrillville
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
74% 74% 71% 66% 65% 67% 70% 73% 73% 71% 74% 78%

Other monthly averages

UV index Best time to go?

Merrillville weather stats

Merrillville weather statistics
Hottest month: July 28.8°C 83.8°F
Driest month: February 38mm 1.5ins
Sunniest month: July 11hrs
Coldest month: January -1.3°C 29.7°F
Wettest month: June 106mm 4.2ins
Warmest sea: August 21.8°C 71.2°F
Map showing location of Merrillville (41.48281, -87.33281) Merrillville map pin © Google

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