Keystone weather by month

Check out Keystone weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

Temperature in Keystone (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
1°C maximum daytime temperature in January in Keystone1
3°C maximum daytime temperature in February in Keystone3
7°C maximum daytime temperature in March in Keystone7
14°C maximum daytime temperature in April in Keystone14
19°C maximum daytime temperature in May in Keystone19
25°C maximum daytime temperature in June in Keystone25
29°C maximum daytime temperature in July in Keystone29
28°C maximum daytime temperature in August in Keystone28
23°C maximum daytime temperature in September in Keystone23
16°C maximum daytime temperature in October in Keystone16
7°C maximum daytime temperature in November in Keystone7
2°C maximum daytime temperature in December in Keystone2
Min temperature (night-time)
-12°C minimum night-time temperature in January in Keystone-12
-10°C minimum night-time temperature in February in Keystone-10
-7°C minimum night-time temperature in March in Keystone-7
-1°C minimum night-time temperature in April in Keystone-1
5°C minimum night-time temperature in May in Keystone5
10°C minimum night-time temperature in June in Keystone10
13°C minimum night-time temperature in July in Keystone13
12°C minimum night-time temperature in August in Keystone12
6°C minimum night-time temperature in September in Keystone6
1°C minimum night-time temperature in October in Keystone1
-6°C minimum night-time temperature in November in Keystone-6
-11°C minimum night-time temperature in December in Keystone-11
Heat & Humidity
No heat & humidity in January in Keystone0
No heat & humidity in February in Keystone0
No heat & humidity in March in Keystone0
No heat & humidity in April in Keystone0
No heat & humidity in May in Keystone0
No heat & humidity in June in Keystone0
Moderate heat & humidity in July in KeystoneM
Low heat & humidity in August in KeystoneL
No heat & humidity in September in Keystone0
No heat & humidity in October in Keystone0
No heat & humidity in November in Keystone0
No heat & humidity in December in Keystone0

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

Sunshine & Daylight in Keystone

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
Daily hours of daylight
9 hours of daylight per day in January in Keystone9
11 hours of daylight per day in February in Keystone11
12 hours of daylight per day in March in Keystone12
13 hours of daylight per day in April in Keystone13
15 hours of daylight per day in May in Keystone15
15 hours of daylight per day in June in Keystone15
15 hours of daylight per day in July in Keystone15
14 hours of daylight per day in August in Keystone14
12 hours of daylight per day in September in Keystone12
11 hours of daylight per day in October in Keystone11
10 hours of daylight per day in November in Keystone10
9 hours of daylight per day in December in Keystone9
UV Index (Maximum)
UV (maximum) index 1 (Low) in January in Keystone1
UV (maximum) index 2 (Low) in February in Keystone2
UV (maximum) index 4 (Moderate) in March in Keystone4
UV (maximum) index 6 (High) in April in Keystone6
UV (maximum) index 7 (High) in May in Keystone7
UV (maximum) index 9 (Very High) in June in Keystone9
UV (maximum) index 9 (Very High) in July in Keystone9
UV (maximum) index 8 (Very High) in August in Keystone8
UV (maximum) index 6 (High) in September in Keystone6
UV (maximum) index 3 (Moderate) in October in Keystone3
UV (maximum) index 2 (Low) in November in Keystone2
UV (maximum) index 1 (Low) in December in Keystone1

Rainfall in Keystone

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
7 days with some rainfall in January in Keystone7
8 days with some rainfall in February in Keystone8
9 days with some rainfall in March in Keystone9
10 days with some rainfall in April in Keystone10
12 days with some rainfall in May in Keystone12
12 days with some rainfall in June in Keystone12
10 days with some rainfall in July in Keystone10
8 days with some rainfall in August in Keystone8
8 days with some rainfall in September in Keystone8
6 days with some rainfall in October in Keystone6
6 days with some rainfall in November in Keystone6
7 days with some rainfall in December in Keystone7
Average monthly rainfall (mm)
9 mm monthly rainfall in January in Keystone9
13 mm monthly rainfall in February in Keystone13
23 mm monthly rainfall in March in Keystone23
46 mm monthly rainfall in April in Keystone46
77 mm monthly rainfall in May in Keystone77
77 mm monthly rainfall in June in Keystone77
61 mm monthly rainfall in July in Keystone61
44 mm monthly rainfall in August in Keystone44
32 mm monthly rainfall in September in Keystone32
25 mm monthly rainfall in October in Keystone25
13 mm monthly rainfall in November in Keystone13
11 mm monthly rainfall in December in Keystone11

More about Keystone

Keystone by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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The climate guide for South Dakota (Keystone) shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

What's the climate like in Keystone?

Keystone has a cold climate with warm summers and some rainfall in all months.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about the USA

Compare Keystone with the UK

Below the Keystone chart shows average maximum daytime temperature for Keystone, South Dakota, USA and the UK (London).

Maximum daytime temperature (°C)

Keystone, South Dakota, USA
UK (London)
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Metric (°C / mm)  |  Imperial (°F / inches)

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