JACKSON, Wyo. — June 1 is the first day of meteorological summer, and recently it has felt like summer in Jackson Hole! Temperatures late last week and over the weekend made it into the 80’s in the Jackson Hole Valley for the first time this year. Temperatures even approached record levels on Saturday but fell just a couple of degrees short.
Rainfall was sparse over the past week as well and most of Wyoming, except for portions of Yellowstone, finished with below-average rainfall for the month of May.
On Friday and Saturday of this past weekend, thunderstorms were common across Yellowstone and areas east and south of Jackson Hole, but Jackson Hole itself missed out on most of the action.
The map below shows where most of the rain fell over the weekend.
The recent warm spell has led to a rapid decline in mountain snowpack, and the rivers are running high as a result. Over the past six days, mountain snow depths have decreased by 15-25 inches with melt rates of 3-4 inches per day on average.
Weekly Weather Outlook – June 1-7
Warm temperatures with limited rain potential will define the weather pattern through Friday aside from occasional isolated thunderstorm chances. The jet stream will be riding just north of the area throughout the week, which will result in gusty west/southwest winds developing each day, especially during the afternoons.
Over the weekend, a low pressure system approaching from the west will result in a transition to a wetter pattern on Saturday and Sunday with increasing shower and thunderstorm activity along with cooler temperatures.
Dry conditions are expected with mostly sunny skies and some occasional high clouds. Highs will reach the low 80s in the valley, continuing the trend of above-average warmth.
In fact, temperatures could approach record levels in the valley again — the record high for the 24-hour period ending at 9 a.m. on June 2nd is 83, so if we see a record it would be reflected on Tuesday’s climate report.
A weak cold front will arrive on Tuesday morning, leading to cooler daytime temperatures with highs in the mid 70s under partly cloudy skies. An uptick in moisture and instability behind the front will lead to some isolated afternoon thunderstorm activity, favoring the higher elevations of the Tetons, Victor/Driggs and areas north of Jackson.
Conditions will be similar to Tuesday with partly cloudy skies, comfortable temperatures and isolated afternoon thunderstorms favoring areas west and north of Jackson.
Temperatures will trend upward during this time, especially on Friday with highs well into the 80s in the valley. Thursday is looking mostly dry with only a slight chance of an afternoon thunderstorm, while storm chances will start to increase by late Friday as winds shift to southwest ahead of the approaching low pressure system.
Cooler and wetter conditions are expected with more frequent shower and thunderstorm activity expected from Saturday morning through Sunday. We’ll trade out highs in the 70s and 80s with highs in the 60s.
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