Best year time to visit Keystone

General weather information about Keystone

Average annual temperature is 11.1 °C

Absolute maximum temperature: 39.1 °C

Absolute minimum temperature: -14.5 °C

Number of sunny days: 219 days

Number of rainy days: 129 days

Number of snow days: 17 days

Look at detailed online map of Keystone

* Weather data for Keystone United States is based on climate observations for 2026 year

Keystone air temperature forecast for each month

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Absolute maximum temperature (°C)	10.4	9.9	13.6	28.1	33.3	33.6	36.7	39.1	31.5	25.1	12.1	10.9
Average daytime temperature (°C)	4.1	5.2	8.7	13.5	25.2	27.7	32.5	30.5	24.3	16.7	6.7	5.1
Average temperature (°C)	0.4	0.0	2.8	7.6	18.3	21.1	25.7	23.9	17.5	10.7	2.7	1.8
Average night temperature (°C)	-2.2	-3.5	-1.4	2.7	11.9	14.4	18.3	17.4	11.9	6.1	0.0	-0.6
Absolute minimum temperature (°C)	-12.3	-14.5	-9.4	-4.0	6.0	7.1	13.6	10.6	5.1	-4.9	-6.6	-5.2

Keystone monthly weather indicators

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Daylight maximum duration (h)	9.0	11.0	12.0	14.0	15.0	15.0	15.0	14.0	13.0	11.0	10.0	8.0
Daylight mean duration (h)	9.0	10.3	11.9	13.6	15.1	15.9	15.5	14.2	12.6	10.9	9.4	8.6
Daylight minimum duration (h)	8.0	9.0	11.0	12.0	14.0	15.0	14.0	13.0	11.0	10.0	8.0	8.0
Sunshine mean duration (h)	4.7	6.4	8.0	9.2	12.6	13.4	14.0	11.0	9.6	8.1	5.5	3.5
Precipitation (mm)	23	18	31	47	21	10	1	16	10	22	58	87
Sunny days	14	14	11	12	17	25	29	22	21	23	17	14
Rainy days	14	7	15	18	14	5	2	9	9	8	13	15
Snow days	3	7	5	0	0	0	0	0	0	0	0	2

Keystone - weather forecast by months

Keystone weather in january Keystone weather in february Keystone weather in march Keystone weather in april Keystone weather in may Keystone weather in june Keystone weather in july Keystone weather in august Keystone weather in september Keystone weather in october Keystone weather in november Keystone weather in december

Best time to visit Keystone:

The best time to visit Keystone during the most sunny months:

May — 12.6(h)
June — 13.4(h)
July — 14.0(h)

Months with the longest average daylight duration in Keystone:

June — 15.9(h)
July — 15.5(h)

The largest precipitation sum in Keystone is at

April — 47(mm)

November — 58(mm)

December — 87(mm)

Weather forecast in the closest to Keystone admin centers