Annual mean 11°C · wettest around December · prevailing wind W
Warmest
26.7 °C
Coldest
1.0 °C
Wettest
24%
Windiest
4.5 m/s
Prevailing
W
3.7 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 Johnston over the whole year is 11°C. July is the hottest month, with highs of about 26°C; January is the coldest, with lows of about -3°C. Johnston has no sharply defined rainy season: the chance of rain on a given day runs from 12% in July, the driest month, to 23% in December, the wettest. Winds in Johnston are highest in March, averaging 3.5 m/s (13 km/h), and lightest in August, at 2.2 m/s (8 km/h). The prevailing wind is from the W. The clearest skies in Johnston come in November, when the sky is typically 40% covered; May is the cloudiest month, at 53%.
Month by month Johnston 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
-3°C
-4°C
16%
52%
3.3 m/s
0
0
6
February
3°C
-2°C
-2°C
19%
50%
3.1 m/s
1
0
11
March
7°C
1°C
1°C
17%
49%
3.5 m/s
2
0
23
April
12°C
6°C
7°C
20%
52%
3.3 m/s
13
1
50
May
18°C
11°C
15°C
17%
53%
2.9 m/s
45
7
72
June
23°C
16°C
22°C
12%
46%
2.5 m/s
74
31
52
July
26°C
20°C
27°C
12%
44%
2.3 m/s
48
61
18
August
26°C
19°C
26°C
13%
42%
2.2 m/s
58
53
26
September
22°C
15°C
21°C
15%
48%
2.4 m/s
71
23
59
October
17°C
10°C
14°C
15%
48%
2.6 m/s
46
4
73
November
10°C
4°C
5°C
17%
40%
2.9 m/s
11
0
37
December
4°C
-0°C
-1°C
23%
46%
2.9 m/s
0
0
13
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 Johnston weather by season
Year round, Johnston has days of about 2°C at their warmest in January, its coolest month, and 26°C in July, its warmest; the coolest hours of the day run from -3°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 December and least likely around July. 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.
Johnston weather in winterDecember to February
High 3°CLow -2°CRain 19%
Winter in Johnston has typical daily highs of about 3°C and lows of about -2°C, with a 19% chance of rain on a given day.
Johnston weather in springMarch to May
High 12°CLow 6°CRain 18%
Spring in Johnston has typical daily highs of about 12°C and lows of about 6°C, with a 18% chance of rain on a given day.
Johnston weather in summerJune to August
High 25°CLow 18°CRain 12%
Summer in Johnston has typical daily highs of about 25°C and lows of about 18°C, with a 12% chance of rain on a given day.
Johnston weather in autumnSeptember to November
High 16°CLow 9°CRain 16%
Autumn in Johnston has typical daily highs of about 16°C and lows of about 9°C, with a 16% chance of rain on a given day.
When is the rainy season in Johnston?
Johnston has no sharply defined rainy season: the chance of rain on a given day runs from 12% in July, the driest month, to 23% in December, the wettest.
What time of year is Johnston windiest?
Winds in Johnston are highest in March, averaging 3.5 m/s (13 km/h), and lightest in August, at 2.2 m/s (8 km/h). The prevailing wind is from the W.
What is the average temperature in Johnston year round?
The average temperature in Johnston over the whole year is 11°C. July is the hottest month, with highs of about 26°C; January is the coldest, with lows of about -3°C.