Annual mean 23°C · wettest around August · prevailing wind S
Warmest
31.5 °C
Coldest
18.9 °C
Wettest
39%
Windiest
4.3 m/s
Prevailing
S
3.6 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
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 Keystone over the whole year is 23°C. August is the hottest month, with highs of about 31°C; January is the coldest, with lows of about 13°C. Keystone has no sharply defined rainy season: the chance of rain on a given day runs from 27% in March, the driest month, to 34% in August, the wettest. Winds in Keystone are highest in April, averaging 3.1 m/s (11 km/h), and lightest in July, at 2.3 m/s (8 km/h). The prevailing wind is from the S. The clearest skies in Keystone come in May, when the sky is typically 40% covered; January is the cloudiest month, at 49%.
Month by month Keystone 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
19°C
13°C
17°C
30%
49%
3.0 m/s
60
14
68
February
23°C
16°C
22°C
30%
46%
2.8 m/s
70
36
48
March
25°C
17°C
23°C
27%
42%
3.0 m/s
69
45
41
April
27°C
20°C
26°C
30%
40%
3.1 m/s
56
62
22
May
30°C
23°C
30°C
30%
40%
2.9 m/s
20
68
4
June
31°C
25°C
33°C
34%
48%
2.6 m/s
4
43
1
July
31°C
26°C
35°C
34%
45%
2.3 m/s
2
24
0
August
31°C
26°C
35°C
34%
46%
2.4 m/s
2
23
0
September
31°C
25°C
34°C
34%
46%
2.5 m/s
4
35
1
October
29°C
22°C
29°C
31%
44%
2.8 m/s
27
61
10
November
25°C
17°C
24°C
29%
46%
2.8 m/s
64
48
36
December
22°C
15°C
21°C
30%
46%
2.7 m/s
68
30
54
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 Keystone weather by season
Year round, Keystone has days of about 19°C at their warmest in January, its coolest month, and 31°C in August, its warmest; the coolest hours of the day run from 13°C to 26°C through the year, and the average temperature over the year is 23°C around the clock. Rain is most likely around August and least likely around March. 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.
Keystone weather in winterDecember to February
High 21°CLow 14°CRain 30%
Winter in Keystone has typical daily highs of about 21°C and lows of about 14°C, with a 30% chance of rain on a given day.
Keystone weather in springMarch to May
High 27°CLow 20°CRain 29%
Spring in Keystone has typical daily highs of about 27°C and lows of about 20°C, with a 29% chance of rain on a given day.
Keystone weather in summerJune to August
High 31°CLow 26°CRain 34%
Summer in Keystone has typical daily highs of about 31°C and lows of about 26°C, with a 34% chance of rain on a given day.
Keystone weather in autumnSeptember to November
High 28°CLow 21°CRain 31%
Autumn in Keystone has typical daily highs of about 28°C and lows of about 21°C, with a 31% chance of rain on a given day.
When is the rainy season in Keystone?
Keystone has no sharply defined rainy season: the chance of rain on a given day runs from 27% in March, the driest month, to 34% in August, the wettest.
What time of year is Keystone windiest?
Winds in Keystone are highest in April, averaging 3.1 m/s (11 km/h), and lightest in July, at 2.3 m/s (8 km/h). The prevailing wind is from the S.
What is the average temperature in Keystone year round?
The average temperature in Keystone over the whole year is 23°C. August is the hottest month, with highs of about 31°C; January is the coldest, with lows of about 13°C.