Back-to-Back Pacific Storms to Impact the West Coast; Heavy Snow in the Central Appalachians

Back-to-back powerful Pacific storm systems to impact the Pacific Northwest and northern California through the end of this week with heavy rain, flooding, strong winds, and higher elevation mountain snow. A strong, long-duration atmospheric river will accompany the Pacific storms, bringing excessive rainfall and flash flooding to southwest Oregon and northwest California through the week. Read More >

The December 2019 climate summaries for Big Piney, Buffalo, Casper, Greybull, Lake Yellowstone, Lander, Riverton, Rock Springs, and Worland are now available online.

December was pretty dry across the Cowboy State with the exception of Casper, the only location to exceed normal monthly precipitation. Big Piney, Greybull and Worland all tied for the driest month on record, and Worland's records go all the way back to 1947. There were hardly any daily precipitation records broken in December, just Lander and Lake Yellowstone. The temperatures were a mix of above and below average temperatures for the month. Big Piney was very cold at 7 degrees below normal, and breaking the record for coldest December on record. The coldest temperature in Big Piney was 22 degrees below zero on the 31st. Several daily temperature records were broken at the climate sites, both low temperatures and high. Christmas week saw several record highs at Buffalo, Greybull and Lake Yellowstone. The first and the 16th saw record lows at the Riverton airport and in Big Piney.

Check the CLMs for more specifics on daily records set at the various locations. See the links above for details for individual sites or click here for Water Year Precipitation summaries for more locations.

If you would like additional, or more in-depth climate information, please refer to our Climate Page. From the Riverton Home Page, hover over the "Climate and Past Weather" tab, and select the "Local" option. You can then find the Daily Climate Report (CLI), the Preliminary Monthly Climate Data (CF6), the Monthly Weather Summary (CLM), and the Regional Summary (RTP). The Daily Climate Report will have the weather data for the day (from midnight to 1159 pm). The Monthly Climate Data (CF6) will have this data for each day of the month, compiling all the daily data into one form. The Regional Summary will have temperature and precipitation data for various locations across the state, updated 3 times a day.

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Back-to-Back Pacific Storms to Impact the West Coast; Heavy Snow in the Central Appalachians

December 2019 Regional Climate Summary for Western / Central Wyoming