When to go · Keystone
Keystone, month by month
The best months for Keystone: May, Jun, Jul, Aug, Sep.
Month by month
- JanuaryMixedOutside the best window (May–Sep). Across United States: Cold and snowy north and in the mountains; Florida, Hawaii and the desert Southwest are the picks.2 °C (36 °F) / -11 °C (12 °F), 5 rain days36 °F (2 °C) / 12 °F (-11 °C), 5 rain daysCrowds: Low
- FebruaryMixedOutside the best window (May–Sep). Across United States: Still winter north; ski season in the Rockies; Presidents' Day weekend busy. Mardi Gras in New Orleans (date varies).4 °C (39 °F) / -9 °C (16 °F), 5 rain days39 °F (4 °C) / 16 °F (-9 °C), 5 rain daysCrowds: Low · 1 festival or holiday
- MarchGoodOutside the best window (May–Sep). Across United States: Spring break fills Florida beaches and parks; the desert parks come into season.9 °C (48 °F) / -5 °C (23 °F), 7 rain days48 °F (9 °C) / 23 °F (-5 °C), 7 rain daysCrowds: Medium · 2 festivals or holidays
- AprilGoodOutside the best window (May–Sep). Across United States: Good month for the Southwest, Washington cherry blossoms, the South; mountain roads still closed.15 °C (59 °F) / 0 °C (32 °F), 9 rain days59 °F (15 °C) / 32 °F (0 °C), 9 rain daysCrowds: Medium · 1 festival or holiday
- MayGreatInside Keystone's best window: May–Sep.20 °C (68 °F) / 6 °C (43 °F), 11 rain days68 °F (20 °C) / 43 °F (6 °C), 11 rain daysCrowds: Medium · 1 festival or holiday
- JuneGreatInside Keystone's best window: May–Sep.26 °C (79 °F) / 11 °C (52 °F), 12 rain days79 °F (26 °C) / 52 °F (11 °C), 12 rain daysCrowds: High
- JulyGreatInside Keystone's best window: May–Sep.30 °C (86 °F) / 14 °C (57 °F), 10 rain days86 °F (30 °C) / 57 °F (14 °C), 10 rain daysCrowds: High · 1 festival or holiday
- AugustGreatInside Keystone's best window: May–Sep.29 °C (84 °F) / 13 °C (55 °F), 9 rain days84 °F (29 °C) / 55 °F (13 °C), 9 rain daysCrowds: High
- SeptemberGreatInside Keystone's best window: May–Sep.24 °C (75 °F) / 8 °C (46 °F), 7 rain days75 °F (24 °C) / 46 °F (8 °C), 7 rain daysCrowds: Medium · 1 festival or holiday
- OctoberGoodOutside the best window (May–Sep). Across United States: Best all-round month: New England foliage, desert parks, cooler cities. High roads start closing late in the month.17 °C (63 °F) / 2 °C (36 °F), 6 rain days63 °F (17 °C) / 36 °F (2 °C), 6 rain daysCrowds: Medium
- NovemberMixedOutside the best window (May–Sep). Across United States: Quiet between holidays; Thanksgiving week is the busiest travel period of the year.9 °C (48 °F) / -5 °C (23 °F), 5 rain days48 °F (9 °C) / 23 °F (-5 °C), 5 rain daysCrowds: Medium · 1 festival or holiday
- DecemberMixedOutside the best window (May–Sep). Across United States: Holiday lights in New York, ski season opens; flights and hotels peak around Christmas and New Year.3 °C (37 °F) / -10 °C (14 °F), 5 rain days37 °F (3 °C) / 14 °F (-10 °C), 5 rain daysCrowds: High · 1 festival or holiday
Compare two months
Weather, crowds and prices for any two months in Keystone, side by side.
Verdict
May: Great
Jun: Great
Daytime high
May: 20 °C (68 °F)68 °F (20 °C)
Jun: 26 °C (79 °F)79 °F (26 °C)
Night low
May: 6 °C (43 °F)43 °F (6 °C)
Jun: 11 °C (52 °F)52 °F (11 °C)
Rain days
May: 11 (better)
Jun: 12
Crowds
May: Medium
Jun: High
Prices
May: Medium
Jun: High
Festivals listed
May: 1
Jun: 0
May: Inside Keystone's best window: May–Sep.
June: Inside Keystone's best window: May–Sep.
Keystone: figures are long-term averages from this guide, not a forecast.