One of the most important things to take into consideration before planning your trip to the park is weather. Here’s a table of historical high/low temperatures that should help you figure out what to pack. Remember, even though this is a dryer than normal winter and it’s been quite warm recently, you should still plan for unexpected snow, hail, and rain through mid-late June at higher eleveations.
| Month | Maximum | Minimum | Precipitation |
| (°F / °C) | (°F / °C) | (inches / cm) | |
| January | 49/9 | 26/-3 | 6.2/15.7 |
| February | 55/13 | 28/-2 | 6.1/15.5 |
| March | 59/15 | 31/0 | 5.2/13.2 |
| April | 65/18 | 35/2 | 3.0/7.6 |
| May | 73/23 | 42/5 | 1.3/3.3 |
| June | 82/28 | 48/9 | 0.7/1.8 |
| July | 90/32 | 54/12 | 0.4/1.0 |
| August | 90/32 | 53/11 | 0.3/0.8 |
| September | 87/30 | 47/8 | 0.9/2.3 |
| October | 74/23 | 39/4 | 2.1/5.3 |
| November | 58/14 | 31/0 | 5.5/14 |
| December | 48/9 | 26/-3 | 5.6/14.2 |
Chart and temperature information courtesy of National Park Service.