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Grand Teton National Park


Wyoming

Climate & Temperatures

Recommended Clothing
Raingear is recommended during spring, summer and fall. Sub-zero temperatures are common throughout winter and demand multi-layered clothing, hats, mittens and cold weather boots.

Jackson Hole has long, cold winters. The first heavy snows fall by November 1 and continue through March; snow and frost are possible during any month.

Mid-April, May, June
Mild days and cool nights alternate with rain and occasional snow. Valley trails are snow covered until late May.

July and August
Warm days and cool nights prevail, with afternoon thundershowers common.

September, October, November
Sunny days and cold nights alternate with rain and occasional snow storms.

December through mid-April
Between storms the days are sunny and nights are frigid. Snow blankets the mountains and valley. Vehicles with four-wheel drive or all-weather tires are recommended for winter travel, roads may be closed during blizzards. Drive at or below posted speed limits at all times; moose and other wildlife are often seen crossing roads during the winter.

Click for  Forecast

The chart below was calculated using data collected at Moose, Wyoming from 12/1958 to 12/2001.

Ave Max TempAve Min TempAve Precip

Ave Snow
(inches)

Ave Snow Depth

Jan
25.7
1.2
2.61
44.4
28
Feb
31.1
3.6
2.00
30.0
34
Mar
39.0
11.9
1.6
20.6
32
Apr
49.0
22.1
1.45
9.3
13
May
60.9
30.9
1.96
2.8
0
Jun
70.6
37.2
1.8
0.1
0
Jul
79.8
41.2
1.22
0
0
Aug
78.8
39.6
1.37
0
0
Sep
68.9
32.2
1.44
0.5
0
Oct
55.9
23.2
1.24
4.4
0
Nov
38.0
13.7
2.14
25.2
4
Dec
26.0
1.5
2.47
39.2
16
Ann
52.0
21.5
21.3
176.5
11

Jackson Hole hardly seems the same place when one contrasts the winter and summer seasons. The southern end of the valley averages 15 feet of snow in the winter and often reaches balmy 80 degree temperatures in the summer. Temperatures in higher elevations average four degrees Fahrenheit cooler every 1,000 feet in rise.

Winter doesn’t officially set in until December 21, but the first heavy snows may fall by November 1. Between winter storms the days are sunny and the nights are frigid. Average temperatures range from a daily maximum of 29°F to a minimum of 6°F. Ask at the Moose Visitor Center for road closures during blizzards.

During spring mild days and cool nights frequently come with rain or snow. The spring months average 11 days with measurable precipitation. Temperatures typically range from 22°F to 49° F. Valley trails remain snow-covered until late May.

Between the months of June through August the average daily temperature is 76°F, but high-elevation hiking trails don’t melt out until mid-July. Nighttime temperatures can reach the lower 40s. Most of the year’s precipitation falls during the summer months; afternoon thunderstorms are common.

Sun and occasional rain and snow fill the short fall days. The average daily maximum is 54°F while the minimum average is a cool 25°F. The fall months average 23 days that drop below freezing. For a comfortable trip, bring plenty of layered clothing.

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Document Information
Source: National Park Service; magazinUSA.com
Last modified: 20070421
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