Annual mean 10°C · wettest around February · prevailing wind SW
Warmest
18.3 °C
Coldest
5.0 °C
Wettest
41%
Windiest
6.5 m/s
Prevailing
SW
5.1 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
never good
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 Johnstone over the whole year is 10°C. July is the hottest month, with highs of about 17°C; January is the coldest, with lows of about 4°C. Johnstone has no sharply defined rainy season: the chance of rain on a given day runs from 19% in April, the driest month, to 36% in February, the wettest. Winds in Johnstone are highest in February, averaging 5.4 m/s (19 km/h), and lightest in July, at 3.8 m/s (14 km/h). The prevailing wind is from the SW. The clearest skies in Johnstone come in April, when the sky is typically 58% covered; December is the cloudiest month, at 71%.
Month by month Johnstone 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
6°C
4°C
1°C
31%
69%
4.7 m/s
0
0
8
February
7°C
4°C
1°C
36%
69%
5.4 m/s
0
0
10
March
8°C
4°C
3°C
27%
67%
4.5 m/s
1
0
21
April
11°C
5°C
6°C
19%
58%
4.1 m/s
3
0
44
May
14°C
9°C
10°C
20%
60%
3.9 m/s
19
0
72
June
17°C
12°C
13°C
21%
65%
4.1 m/s
36
2
78
July
17°C
13°C
15°C
22%
68%
3.8 m/s
50
2
81
August
17°C
13°C
14°C
28%
66%
4.0 m/s
45
2
80
September
15°C
11°C
12°C
25%
64%
4.0 m/s
27
1
77
October
12°C
9°C
8°C
32%
68%
4.5 m/s
3
0
58
November
8°C
6°C
4°C
29%
66%
4.0 m/s
0
0
29
December
6°C
5°C
2°C
34%
71%
4.6 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 Johnstone weather by season
Year round, Johnstone has days of about 6°C at their warmest in January, its coolest month, and 17°C in July, its warmest; the coolest hours of the day run from 4°C to 13°C through the year, and the average temperature over the year is 10°C around the clock. Rain is most likely around February and least likely around April. 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.
Johnstone weather in winterDecember to February
High 6°CLow 4°CRain 34%
Winter in Johnstone has typical daily highs of about 6°C and lows of about 4°C, with a 34% chance of rain on a given day.
Johnstone weather in springMarch to May
High 11°CLow 6°CRain 22%
Spring in Johnstone has typical daily highs of about 11°C and lows of about 6°C, with a 22% chance of rain on a given day.
Johnstone weather in summerJune to August
High 17°CLow 13°CRain 24%
Summer in Johnstone has typical daily highs of about 17°C and lows of about 13°C, with a 24% chance of rain on a given day.
Johnstone weather in autumnSeptember to November
High 12°CLow 8°CRain 29%
Autumn in Johnstone has typical daily highs of about 12°C and lows of about 8°C, with a 29% chance of rain on a given day.
When is the rainy season in Johnstone?
Johnstone has no sharply defined rainy season: the chance of rain on a given day runs from 19% in April, the driest month, to 36% in February, the wettest.
What time of year is Johnstone windiest?
Winds in Johnstone are highest in February, averaging 5.4 m/s (19 km/h), and lightest in July, at 3.8 m/s (14 km/h). The prevailing wind is from the SW.
What is the average temperature in Johnstone year round?
The average temperature in Johnstone over the whole year is 10°C. July is the hottest month, with highs of about 17°C; January is the coldest, with lows of about 4°C.