Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

2021 Climate Summaries

Top 5 Weather Events 2021

Casper

Lander

Riverton

Top 5 Events of 2021 (video presentations):


Number 5: Lack of Severe Thunderstorms	Number 4: Heavy Snow / Avalanche Deaths in February

Number 3: Late July Monsoon Flooding	Number 2: Fatal Fire near Clark, November 15-16th

And the number one event of 2021 was...

Number 1: Casper Snowstorm, March 13th - 14th

Click Here for the complete 2021 summary for Casper

...Highlights of 2021...

Annual:
- 26th warmest year on record at 46.3 degrees, just 0.7 degrees above normal.
- 17th wettest year with 14.52 inches, 119% of normal.
- 7th snowiest year with 108.1 inches, 151% of normal.
- Highest wind gust was 90 mph on March 29th.
Monthly Temperatures: 2nd coldest February on record. 4th warmest June (tie), 4th warmest November and 8th warmest December on record.
Monthly Precipitation: 1st wettest March, 8th driest May and 4th wettest October on record.
Monthly Snowfall: 1st snowiest March and 4th snowiest October on record.

Click Here for the complete 2021 summary for Lander

...Highlights of 2021...

Annual - 5th warmest year at 47.4 degrees with 129 years of record (1892-2021).
37th Wettest year on record with14.92 inches, 113% of normal precipitation.
25th Least Snowiest year on record with 59 inches (67 percent of normal).
The peak wind gust for the year was 79 mph which occurred on August 15th.
Monthly Temperature: 2nd warmest June, 7th warmest July, 10th warmest September, 3rd warmest November and 4th warmest December on record.
Monthly Precipitation: 10th driest January, 10th driest February, 9th wettest March and 3rd wettest October on record.
Monthly Snowfall: 10th least snowiest January and 8th least snowiest February on record.

Click Here for the complete 2021 summary for Riverton

...Highlights of 2021...

Annual: Average temperature 3.6 degrees above normal in 2021. Precipitation was 1.02 inches below normal, or 89% of normal. Below average snowfall of 92%, and just 3.5 inches below normal.
- Average annual temperature 47.1 degrees which was the 2nd warmest year on 103 years of record (1918-2021).
- 2021 precipitation total was 8.48 inches which was the 51st driest or 53 wettest year on 103 years of record (1918-2021).
- 2021 snowfall total was 40.8 inches which was the 33rd snowiest year on 103 years of record. .
Seasonal: The 2020-2021 Seasonal Snow total was 48.2 inches, the 20th snowiest season on record.
Monthly Temperatures: 2nd warmest June, 6th warmest July, 10th warmest September, 3rd warmest November, and 2nd warmest December.
Monthly Precipitation: 5th wettest March, 7th wettest August, and tied for 3rd driest November
Monthly Snowfall: 8th snowiest March and 10th snowiest April on record.

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Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

2021 Wyoming Annual Climate Summary