Colorado has warm, dry summers and cold winters: NOAA's 1991–2020 normals for Denver International Airport give highs of 87.5–89.9°F in July and August and 44.0–45.7°F in December–February. Aspen is much colder (a January high of 34.6°F and low of 8.7°F). Choose by region; we have no verified dataset for crowds or prices.
Month-by-month climate table
| Month | Normal high | Normal low | Normal precipitation | Verified schedule notes |
|---|---|---|---|---|
| January | 44.6°F | 18.7°F | 0.38 in | — |
| February | 45.7°F | 19.7°F | 0.41 in | — |
| March | 55.7°F | 27.5°F | 0.86 in | — |
| April | 61.7°F | 33.9°F | 1.68 in | — |
| May | 71.2°F | 43.6°F | 2.16 in | Rocky Mountain timed entry began May 22 (2026) |
| June | 83.4°F | 53.0°F | 1.94 in | — |
| July | 89.9°F | 60.2°F | 2.14 in | — |
| August | 87.5°F | 58.3°F | 1.58 in | — |
| September | 79.6°F | 50.0°F | 1.35 in | — |
| October | 65.3°F | 37.0°F | 0.99 in | Rocky Mountain timed entry ended Oct 12 (Bear Lake Road option ~Oct 19) |
| November | 52.9°F | 26.0°F | 0.64 in | — |
| December | 44.0°F | 18.4°F | 0.35 in | — |
Source: NOAA NCEI U.S. Climate Normals 1991–2020, Denver International Airport (USW00003017), retrieved October 19, 2026; the station reports no snowfall normals. Normals are 30-year averages; actual weather varies. Schedule notes are from the National Park Service.
Other regions at a glance
| Station | January high / low | July high / low | Snowfall |
|---|---|---|---|
| Denver | 44.6°F / 18.7°F | 89.9°F / 60.2°F | not reported |
| Colorado Springs | 45.0°F / 18.5°F | 86.5°F / 58.2°F | 4.1–5.7 in a month, December–April |
| Aspen | 34.6°F / 8.7°F | 82.2°F / 48.3°F | not reported |
How to choose your month
- Warmest: June–August (Denver highs 83.4–89.9°F).
- Coldest: December–February (Denver lows 18.4–19.7°F; Aspen lows 8.7–12.4°F).
- Wettest in Denver: May (2.16 inches) and July (2.14).
Limits of this guide
Normals describe typical conditions, not forecasts, and we have no verified dataset for road closures, ski conditions, crowds or prices by month, so this page makes no such claims. Use the National Weather Service for forecasts.