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May Weather in Grand Teton National Park Wyoming, United States

Daily high temperatures increase by 9°F, from 55°F to 64°F, rarely falling below 42°F or exceeding 76°F.

Daily low temperatures increase by 7°F, from 30°F to 37°F, rarely falling below 21°F or exceeding 44°F.

For reference, on July 27, the hottest day of the year, temperatures in Grand Teton National Park typically range from 44°F to 80°F, while on January 27, the coldest day of the year, they range from 6°F to 25°F.

Average High and Low Temperature in May in Grand Teton National Park

Average High and Low Temperature in May in Grand Teton National ParkMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313110°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°FAprJunMay 155°FMay 155°F30°F30°FMay 3164°FMay 3164°F37°F37°FMay 1158°FMay 1158°F32°F32°FMay 2162°FMay 2162°F35°F35°F
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on May. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in May in Grand Teton National Park

Average Hourly Temperature in May in Grand Teton National ParkMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMAprJunfreezingvery coldcoldcoldcoolcomfortablefreezing
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.
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The month of May in Grand Teton National Park experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 53% to 46%.

The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 54% of the time.

For reference, on March 17, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on July 27, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 78%.

Cloud Cover Categories in May in Grand Teton National Park

Cloud Cover Categories in May in Grand Teton National ParkMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJunMay 147%May 147%May 3154%May 3154%May 1148%May 1148%May 2150%May 2150%clearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Grand Teton National Park, the chance of a wet day over the course of May is gradually increasing, starting the month at 28% and ending it at 31%.

For reference, the year's highest daily chance of a wet day is 32% on May 29, and its lowest chance is 14% on July 3.

Over the course of May in Grand Teton National Park, the chance of a day with only rain increases from 22% to 31%, the chance of a day with mixed snow and rain decreases from 4% to 1%, and the chance of a day with only snow remains an essentially constant 1% throughout.

Probability of Precipitation in May in Grand Teton National Park

Probability of Precipitation in May in Grand Teton National ParkMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%AprJunMay 2932%May 2932%May 128%May 128%May 1130%May 1130%snowmixedrain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during May in Grand Teton National Park is gradually increasing, starting the month at 1.5 inches, when it rarely exceeds 2.6 inches or falls below 0.6 inches, and ending the month at 1.8 inches, when it rarely exceeds 3.2 inches or falls below 0.5 inches.

The highest average 31-day accumulation is 1.8 inches on May 23.

Average Monthly Rainfall in May in Grand Teton National Park

Average Monthly Rainfall in May in Grand Teton National ParkMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 in3.0 in3.0 in3.5 in3.5 in4.0 in4.0 inAprJunMay 231.8 inMay 231.8 inMay 11.5 inMay 11.5 inMay 111.7 inMay 111.7 in
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day snowfall during May in Grand Teton National Park is decreasing, starting the month at 1.3 inches, when it rarely exceeds 3.4 inches or falls below 0.1 inches, and ending the month at 0.2 inches, when it rarely exceeds 0.7 inches.

Average Monthly Snowfall in May in Grand Teton National Park

The average snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.

Over the course of May in Grand Teton National Park, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 1 minute, implying an average daily increase of 2 minutes, 3 seconds, and weekly increase of 14 minutes, 21 seconds.

The shortest day of the month is May 1, with 14 hours, 12 minutes of daylight and the longest day is May 31, with 15 hours, 14 minutes of daylight.

Hours of Daylight and Twilight in May in Grand Teton National Park

Hours of Daylight and Twilight in May in Grand Teton National ParkMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAprJunnightnightdaydayMay 114 hr, 12 minMay 114 hr, 12 minMay 3115 hr, 14 minMay 3115 hr, 14 minMay 1614 hr, 48 minMay 1614 hr, 48 min
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The latest sunrise of the month in Grand Teton National Park is 6:13 AM on May 1 and the earliest sunrise is 30 minutes earlier at 5:43 AM on May 31.

The earliest sunset is 8:26 PM on May 1 and the latest sunset is 31 minutes later at 8:57 PM on May 31.

Daylight saving time is observed in Grand Teton National Park during 2024, but it neither starts nor ends during May, so the entire month is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:40 AM and sets 15 hours, 28 minutes later, at 9:08 PM, while on December 21, the shortest day of the year, it rises at 7:53 AM and sets 8 hours, 55 minutes later, at 4:48 PM.

Sunrise & Sunset with Twilight in May in Grand Teton National Park

The solar day over the course of May. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in May in Grand Teton National Park

Solar Elevation and Azimuth in May in Grand Teton National ParkMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMAprJun00101020202030304040505050606000010102020303030404050506060
northeastsouthwest
Solar elevation and azimuth over the course of May 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for May 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in May in Grand Teton National Park

Moon Rise, Set & Phases in May in Grand Teton National ParkMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAprJunApr 812:22 PMApr 812:22 PMApr 235:50 PMApr 235:50 PMMay 79:23 PMMay 79:23 PMMay 237:54 AMMay 237:54 AMJun 66:38 AMJun 66:38 AMJun 217:09 PMJun 217:09 PM6:48 AM6:48 AM8:20 PM8:20 PM8:22 PM8:22 PM6:32 AM6:32 AM5:36 AM5:36 AM8:34 PM8:34 PM8:27 PM8:27 PM5:29 AM5:29 AM5:18 AM5:18 AM9:59 PM9:59 PM9:35 PM9:35 PM5:46 AM5:46 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
May 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
50%3:12 AMESE12:36 PMWSW-7:54 AMS231,922 mi
2
37%3:41 AMESE1:55 PMWSW-8:48 AMS229,618 mi
3
26%4:06 AMESE3:14 PMW-9:39 AMS227,674 mi
4
16%4:28 AME4:32 PMW-10:28 AMS226,295 mi
5
8%4:49 AME5:52 PMW-11:17 AMS225,677 mi
6
3%5:11 AMENE7:12 PMWNW-12:07 PMS225,972 mi
7
0%5:36 AMENE8:34 PMWNW-12:59 PMS227,240 mi
8
1%6:05 AMENE9:55 PMNW-1:55 PMS229,431 mi
9
4%6:43 AMNE11:11 PMNW-2:53 PMS232,381 mi
10
10%7:29 AMNE--3:52 PMS235,830 mi
11
17%-12:17 AMNW8:26 AMNE4:50 PMS239,466 mi
12
26%-1:10 AMNW9:31 AMNE5:45 PMS242,975 mi
13
36%-1:51 AMNW10:39 AMNE6:36 PMS246,082 mi
14
46%-2:23 AMWNW11:47 AMENE7:22 PMS248,578 mi
15
50%-2:48 AMWNW12:54 PMENE8:05 PMS250,325 mi
16
65%-3:08 AMWNW1:58 PMENE8:45 PMS251,260 mi
17
74%-3:26 AMW3:00 PME9:24 PMS251,386 mi
18
82%-3:42 AMW4:02 PME10:02 PMS250,767 mi
19
89%-3:59 AMW5:05 PME10:42 PMS249,512 mi
20
95%-4:16 AMWSW6:10 PMESE11:23 PMS247,760 mi
21
97%-4:36 AMWSW7:17 PMESE--
22
98%-4:59 AMWSW8:27 PMESE12:09 AMS245,666 mi
23
100%-5:29 AMSW9:38 PMSE12:58 AMS243,386 mi
24
99%-6:07 AMSW10:45 PMSE1:52 AMS241,058 mi
25
96%-6:57 AMSW11:45 PMSE2:51 AMS238,798 mi
26
91%-7:58 AMSW-3:51 AMS236,684 mi
27
84%12:34 AMSE9:09 AMSW-4:52 AMS234,761 mi
28
74%1:13 AMESE10:26 AMWSW-5:50 AMS233,049 mi
29
64%1:44 AMESE11:44 AMWSW-6:44 AMS231,563 mi
30
50%2:10 AMESE1:01 PMWSW-7:35 AMS230,328 mi
31
40%2:32 AME2:18 PMW-8:23 AMS229,393 mi

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in Grand Teton National Park is essentially constant during May, remaining around 0% throughout.

Humidity Comfort Levels in May in Grand Teton National Park

Humidity Comfort Levels in May in Grand Teton National ParkMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AprJunMay 160%May 160%May 10%May 10%May 310%May 310%drydry
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Grand Teton National Park is essentially constant during May, remaining within 0.1 miles per hour of 5.1 miles per hour throughout.

For reference, on March 29, the windiest day of the year, the daily average wind speed is 5.4 miles per hour, while on August 4, the calmest day of the year, the daily average wind speed is 4.7 miles per hour.

The lowest daily average wind speed during May is 5.0 miles per hour on May 28.

Average Wind Speed in May in Grand Teton National Park

Average Wind Speed in May in Grand Teton National ParkMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mphAprJunMay 285.0 mphMay 285.0 mphMay 15.2 mphMay 15.2 mphMay 115.1 mphMay 115.1 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction in Grand Teton National Park throughout May is predominantly from the west, with a peak proportion of 47% on May 31.

Wind Direction in May in Grand Teton National Park

Wind Direction in May in Grand Teton National ParkMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%AprJunwestsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Grand Teton National Park typically lasts for 2.4 months (72 days), from around June 18 to around August 29, rarely starting before May 24 or after July 11, and rarely ending before August 6 or after September 17.

The month of May in Grand Teton National Park is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season increasing from 1% to 17% over the course of the month.

Time Spent in Various Temperature Bands and the Growing Season in May in Grand Teton National Park

Time Spent in Various Temperature Bands and the Growing Season in May in Grand Teton National ParkMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJunMay 11%May 11%May 3117%May 3117%May 112%May 112%May 218%May 218%50%Jun 1850%Jun 18freezingvery coldcoldcoolcomfortablewarmfrigid
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Grand Teton National Park are gradually increasing during May, increasing by 95°F, from 29°F to 125°F, over the course of the month.

Growing Degree Days in May in Grand Teton National Park

Growing Degree Days in May in Grand Teton National ParkMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313120°F20°F40°F40°F60°F60°F80°F80°F100°F100°F120°F120°F140°F140°F160°F160°F180°F180°FAprJunMay 129°FMay 129°FMay 31125°FMay 31125°FMay 1151°FMay 1151°FMay 2182°FMay 2182°F
The average growing degree days accumulated over the course of May, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in Grand Teton National Park is gradually increasing during May, rising by 0.9 kWh, from 6.3 kWh to 7.3 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in May in Grand Teton National Park

Average Daily Incident Shortwave Solar Energy in May in Grand Teton National ParkMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWh10 kWh10 kWhAprJunMay 16.3 kWhMay 16.3 kWhMay 317.3 kWhMay 317.3 kWhMay 116.6 kWhMay 116.6 kWhMay 216.9 kWhMay 216.9 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of Grand Teton National Park are 43.790 deg latitude, -110.682 deg longitude, and 6,424 ft elevation.

The topography within 2 miles of Grand Teton National Park contains only modest variations in elevation, with a maximum elevation change of 282 feet and an average elevation above sea level of 6,923 feet. Within 10 miles contains only modest variations in elevation (7,192 feet). Within 50 miles also contains extreme variations in elevation (8,694 feet).

The area within 2 miles of Grand Teton National Park is covered by shrubs (54%) and trees (40%), within 10 miles by shrubs (45%) and trees (27%), and within 50 miles by trees (44%) and shrubs (36%).

This report illustrates the typical weather in Grand Teton National Park, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

The details of the data sources used for this report can be found on the Jackson Hole Airport page.

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