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Keystone in May

Mild and wet, as the days lengthen.

Typical weather, averaged over 30 years

May in Keystone is mild: highs near 64°F, lows near 41°F. Rain falls on about four days a week, more often as the month goes on, and the days lengthen by 59 minutes from the first week to the last.May in Keystone is mild: highs near 18°C, lows near 5°C. Rain falls on about four days a week, more often as the month goes on, and the days lengthen by 59 minutes from the first week to the last.

High
64°F18°Caverage
Low
41°F5°Caverage
Wet days
4a week · 56% of days
Daylight
14h 44mon average

Is May a good time to visit Keystone?

May sits outside Keystone's best months, which run from September. Expect mild days and rain on about four days a week.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How May sits in the year

week by week

Temperature

Highs near 64°F in May, against 38°F to 84°F through the year.Highs near 18°C in May, against 3°C to 29°C through the year.

Chance of a wet day

56% of days in May, against 16% to 57% through the year.

Cloud cover

51% cover in May, against 27% to 54% through the year.

Daylight

14h 44m in May, against 8h 57m to 15h 25m through the year.

Week by week, lightly smoothed, with May shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. April55°13°low 31°low -1°3 wet days a weekRain on about three days a week.
  2. May64°18°low 41°low 5°4 wet days a weekRain on about four days a week.
  3. June76°24°low 52°low 11°4 wet days a weekRain on about four days a week.

Where Keystone sits, in May

America/Denver
this place
typical high in May 40°F4°C95°F35°C
Sunrise, mid-May
5:29 AMsets 8:11 PM
Above the sea
1,430 mupland
Latitude
43.9°Nnorthern hemisphere
Nearest of ours
Saratoga386 km south-west

The land around Keystone, shaded by its typical high in May, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in United States in May

high · low · wet days
See May on the planning mapThe whole year in Keystone

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Keystone. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match.Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match. Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.