National Weather Service United States Department of Commerce

2015 Climate Summaries

Casper Climate Summary Banner

...Highlights of 2015...

  • Annual - ...9th warmest year on record (1939-2015), 106 percent of normal precipitation, 92 percent of normal annual snowfall.
  • Earliest First Freeze:  August 23, 2015
  • Monthly Temperatures: 2nd warmest September, 6th warmest March, 9th warmest June and October; period of record 1939-2015).
  • Montly Precipitation: 6th wettest December, 7th wettest May, 7th driest September.
  • Montly Snowfall: 7th snowiest December.

Find the full Casper 2015 Climate Summary here.

Lander Climate Summary Banner

...Highlights of 2015...

  • Annual - ...9th warmest year on record (period of record 1892-2015, 124 years), 120 percent of normal precipitation, 78 percent of normal annual snowfall.
  • Record High So Early in the Season::  76 on March 31, 2015
  • Record High So Late in the Season::  90 on September 26, 2015
  • Latest 90 Degree Temperature:  September 26, 2015
  • Daily Temperature Records: 12 record highs and zero record lows during the year.
  • Monthly Temperatures: Warmest September, 3rd warmest October, 7th warmest June, 9th warmest March on record.
  • Montly Precipitation: 3rd driest January, 3rd wettest May, 9th wettest February on record.
  • Montly Snowfall: 7th least snowiest January.

Find the full Lander 2015 Climate Summary here.

Riverton Climate Summary Banner

...Highlights of 2015...

  • Annual - ...7th Warmest Year on Record (1918-2015), 122 percent of normal precipitation, 130 percent of normal annual snowfall and the 15th snowiest year on record.
  • Latest First Freeze:  October 12, 2015
  • Monthly Temperatures: Warmest September, 2nd Warmest October, 5th Warmest June (over last 97 years, period of record 1918-2015).
  • Montly Precipitation: 2nd Wettest February, 9th Wettest May, 7th Wettest November
  • Montly Snowfall: 2nd Snowiest February and November.

Find the full Riverton 2015 Climate Summary here.

Rock Springs Climate Summary Banner

...Highlights of 2015 ...

  • 2nd Warmest Year on Record (over last 68 years, period of record 1948-2015).
  • 19 record highs set or tied compared to only 1 record low
  • Major Flooding in Rock Springs on July 6th and 7th
  • Driest January, 3rd driest December while July was the 3rd wettest and May was the 5th wettest

Find the full 2015 Rock Springs Climate Summary here.


Worland Climate Summary Banner

...Highlights of 2015...

  • Annual - ...13th warmest year on record (1960-2015), normal precipitation, 5 daily record highs broken or tied, 6 record lows broken or tied.
  • Monthly Temperatures: 2nd warmest October, 5th warmest June, 7th warmest March and September; 9th coldest July, 10th coldest May on record.
  • Montly Precipitation: Driest March (ties 2004),  8th driest September, 3rd wettest February, 6th wettest May on record.

Find the full 2015 Worland Climate Summary here.


Lander Climate Summary Banner

...Highlights of 2015...

  • Annual - ...Statewide average temperature for 2015 of 44.2 degrees was 3.4 degrees above and 20th century average the 3rd warmest year on record over the last 121 years (1895-2015). 
    Statewide average precipitation was 16.62 inches which was near the 20th century average of 15.94 inches.
  • Monthly Temperatures: 6 months in 2015 (January, February, March, June, September, October) were in the top 8 warmest months on record (1895-2015). 
  • Montly Precipitation: 2nd driest March, 4th wettest May on record (1895-2015)

Find the full Wyoming Statewide and Climate Division 2015 Climate Summary here.


Top 7 Events of 2015 (video presentations):


 Number 7: Mid December Snowstorm  Number 6: Thanksgiving Week Snowstorm
Number 5: Supercell Thunderstorm from Hot Springs to Natrona Counties Number 4: June 5th Flooding along US 20/26
Number 3: Buffalo and Johnson County Flooding on June 3rd and 4th Number 2: Cole Creek/Station Fire near Casper


And the number one event of 2015 was...

Number 1: Wind River Canyon Mudslide/Landslide