Annual mean 10°C · wettest around May · prevailing wind SE
Warmest
29.9 °C
Coldest
2.0 °C
Wettest
34%
Windiest
4.5 m/s
Prevailing
SE
3.5 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 Johnstown over the whole year is 10°C. July is the hottest month, with highs of about 30°C; January is the coldest, with lows of about -6°C. Johnstown has no sharply defined rainy season: the chance of rain on a given day runs from 9% in January, the driest month, to 21% in May, the wettest. Winds in Johnstown are highest in April, averaging 3.6 m/s (13 km/h), and lightest in September, at 2.5 m/s (9 km/h). The prevailing wind is from the SE. The clearest skies in Johnstown come in July, when the sky is typically 16% covered; May is the cloudiest month, at 36%.
Month by month Johnstown 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
3°C
-6°C
-2°C
9%
27%
2.6 m/s
0
0
9
February
4°C
-5°C
-2°C
12%
28%
3.1 m/s
1
0
18
March
10°C
-1°C
4°C
12%
32%
3.4 m/s
7
0
39
April
14°C
3°C
9°C
14%
33%
3.6 m/s
27
0
59
May
18°C
9°C
15°C
21%
36%
3.1 m/s
53
6
71
June
26°C
15°C
24°C
14%
21%
2.9 m/s
67
48
40
July
30°C
17°C
28°C
11%
16%
2.8 m/s
44
76
14
August
29°C
16°C
26°C
12%
17%
2.7 m/s
59
68
23
September
25°C
11°C
22°C
17%
19%
2.5 m/s
72
37
50
October
16°C
4°C
12°C
15%
22%
2.7 m/s
44
2
67
November
10°C
-1°C
5°C
11%
21%
2.7 m/s
11
0
42
December
5°C
-4°C
-0°C
12%
21%
2.8 m/s
0
0
18
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 Johnstown weather by season
Year round, Johnstown has days of about 3°C at their warmest in January, its coolest month, and 30°C in July, its warmest; the coolest hours of the day run from -6°C to 17°C through the year, and the average temperature over the year is 10°C around the clock. Rain is most likely around May and least likely around January. 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.
Johnstown weather in winterDecember to February
High 4°CLow -5°CRain 11%
Winter in Johnstown has typical daily highs of about 4°C and lows of about -5°C, with a 11% chance of rain on a given day.
Johnstown weather in springMarch to May
High 14°CLow 3°CRain 16%
Spring in Johnstown has typical daily highs of about 14°C and lows of about 3°C, with a 16% chance of rain on a given day.
Johnstown weather in summerJune to August
High 28°CLow 16°CRain 12%
Summer in Johnstown has typical daily highs of about 28°C and lows of about 16°C, with a 12% chance of rain on a given day.
Johnstown weather in autumnSeptember to November
High 17°CLow 5°CRain 14%
Autumn in Johnstown has typical daily highs of about 17°C and lows of about 5°C, with a 14% chance of rain on a given day.
When is the rainy season in Johnstown?
Johnstown has no sharply defined rainy season: the chance of rain on a given day runs from 9% in January, the driest month, to 21% in May, the wettest.
What time of year is Johnstown windiest?
Winds in Johnstown are highest in April, averaging 3.6 m/s (13 km/h), and lightest in September, at 2.5 m/s (9 km/h). The prevailing wind is from the SE.
What is the average temperature in Johnstown year round?
The average temperature in Johnstown over the whole year is 10°C. July is the hottest month, with highs of about 30°C; January is the coldest, with lows of about -6°C.