Annual mean 11°C · wettest around July · prevailing wind W
Warmest
27.0 °C
Coldest
-2.6 °C
Wettest
67%
Windiest
5.7 m/s
Prevailing
W
4.6 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Merrillville over the whole year is 11°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -5°C. Merrillville has no sharply defined rainy season: the chance of rain on a given day runs from 51% in February, the driest month, to 61% in July, the wettest. Winds in Merrillville are highest in January, averaging 4.2 m/s (15 km/h), and lightest in August, at 2.5 m/s (9 km/h). The prevailing wind is from the W. The clearest skies in Merrillville come in August, when the sky is typically 33% covered; January is the cloudiest month, at 64%.
Month by month Merrillville climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
-2°C
-5°C
-7°C
52%
64%
4.2 m/s
0
0
2
February
2°C
-3°C
-4°C
51%
52%
4.1 m/s
1
0
8
March
7°C
1°C
1°C
58%
52%
4.2 m/s
3
0
20
April
12°C
6°C
7°C
57%
50%
4.2 m/s
20
1
43
May
19°C
13°C
16°C
59%
45%
3.5 m/s
49
13
59
June
25°C
19°C
24°C
55%
35%
3.1 m/s
59
40
37
July
27°C
20°C
27°C
61%
34%
2.6 m/s
47
59
17
August
26°C
19°C
27°C
60%
33%
2.5 m/s
54
54
23
September
24°C
15°C
22°C
56%
36%
2.7 m/s
66
34
48
October
16°C
9°C
13°C
60%
47%
3.3 m/s
36
5
60
November
8°C
3°C
3°C
56%
49%
3.9 m/s
7
0
27
December
2°C
-1°C
-4°C
58%
57%
4.0 m/s
0
0
6
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Merrillville weather by season
Year round, Merrillville has days of about -2°C at their warmest in January, its coolest month, and 27°C in July, its warmest; the coolest hours of the day run from -5°C to 20°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around July and least likely around February. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Merrillville weather in winterDecember to February
High 1°CLow -3°CRain 54%
Winter in Merrillville has typical daily highs of about 1°C and lows of about -3°C, with a 54% chance of rain on a given day.
Merrillville weather in springMarch to May
High 13°CLow 7°CRain 58%
Spring in Merrillville has typical daily highs of about 13°C and lows of about 7°C, with a 58% chance of rain on a given day.
Merrillville weather in summerJune to August
High 26°CLow 19°CRain 59%
Summer in Merrillville has typical daily highs of about 26°C and lows of about 19°C, with a 59% chance of rain on a given day.
Merrillville weather in autumnSeptember to November
High 16°CLow 9°CRain 57%
Autumn in Merrillville has typical daily highs of about 16°C and lows of about 9°C, with a 57% chance of rain on a given day.
When is the rainy season in Merrillville?
Merrillville has no sharply defined rainy season: the chance of rain on a given day runs from 51% in February, the driest month, to 61% in July, the wettest.
What time of year is Merrillville windiest?
Winds in Merrillville are highest in January, averaging 4.2 m/s (15 km/h), and lightest in August, at 2.5 m/s (9 km/h). The prevailing wind is from the W.
What is the average temperature in Merrillville year round?
The average temperature in Merrillville over the whole year is 11°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -5°C.