Climatological Report (Monthly)
Issued by NWS
Issued by NWS
392
CXUS55 KRIW 011646
CLMLND
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1032 AM MDT MON JUN 01 2026
...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR LANDER FOR THE MONTH OF
MAY 2026...
...OFFICIAL CLIMATE DATA FOR THE MONTH OF MAY 2026 WILL BE AVAILABLE
IN APPROXIMATELY 60 DAYS FROM THE NATIONAL CENTERS FOR ENVIRONMENTAL
INFORMATION (HTTP://WWW.NCDC.NOAA.GOV/CDO-WEB/DATASETS). UNOFFICIAL
ASOS DAILY SUMMARIES ARE AVAILABLE ON THE INTERNET AT
HTTP://WWW.WEATHER.GOV/CLIMATE/INDEX.PHP?WFO=RIW
...LANDER WAS WARMER AND DRIER THAN NORMAL IN MAY....
THE AVERAGE TEMPERATURE FOR LANDER IN MAY WAS 55.2 DEGREES WHICH WAS
2.4 DEGREES ABOVE NORMAL. THE WARMEST READING FOR THE MONTH WAS 89
DEGREES ON THE 13TH. THIS BROKE THE 1988 RECORD OF 86 FROM 1988. THE
HIGH OF 84 ON THE 11TH TIED THE 1940 RECORD. THE COLDEST TEMPERATURE
WAS 22 DEGREES ON THE 6TH.
PRECIPITATION FOR THE MONTH WAS 1.89 INCHES...WHICH IS 71 PERCENT OF
NORMAL. THE WETTEST 24-HOUR PERIOD WAS THE 17TH-18TH...WITH 1.07
INCHES OF PRECIPITATION. NO PRECIPITATION RECORDS WERE BROKEN THIS
MONTH.
THE SNOWFALL FOR THE MONTH WAS 12.5 INCHES WHICH IS 278 PERCENT OF
NORMAL. THE SNOWIEST 24-HOUR PERIOD WAS ON THE 18TH WHEN 7.9 INCHES
FELL. THIS BROKE THE 2017 RECORD OF 6.3 INCHES. THE 17TH HAD 0.9
INCHES AND BROKE A TRACE FROM 1978. THE HIGHEST WIND GUST WAS 64 MPH
AND OCCURRED ON THE 13TH FROM THE SOUTHWEST.
...THE LANDER WY CLIMATE SUMMARY FOR THE MONTH OF MAY 2026...
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1891 TO 2026
WEATHER OBSERVED NORMAL DEPART LAST YEAR`S
VALUE DATE(S) VALUE FROM VALUE
NORMAL
..............................................................
TEMPERATURE (F)
RECORD
HIGH 93 05/29/2003
LOW 13 05/02/1903
HIGHEST 89 05/13
LOWEST 22 05/06
AVG. MAXIMUM 69.1 66.1 3.0
AVG. MINIMUM 41.4 39.4 2.0
MEAN 55.2 52.8 2.4
DAYS MAX >= 90 0
DAYS MAX <= 32 0
DAYS MIN <= 32 6
DAYS MIN <= 0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 6.77 2011
MINIMUM 0.06 2020
TOTALS 1.89 2.68 -0.79 1.88
DAILY AVG. 0.06 0.09 -0.03
DAYS >= .01 8
DAYS >= .10 4
DAYS >= .50 1
DAYS >= 1.00 0
GREATEST
24 HR. TOTAL 1.07 05/17 TO 05/18
STORM TOTAL 0.58
SNOWFALL (INCHES)
TOTALS 12.5 4.5 8.0
SINCE 7/1 38.1 87.5 -49.4
SNOWDEPTH AVG. 0
DAYS >= 1.0 2
DEGREE DAYS
HEATING TOTAL 309 385 -76
SINCE 7/1 5514 7588 -2074
COOLING TOTAL 13 5 8
SINCE 1/1 14 5 9
..............................................................
WIND (MPH)
AVERAGE WIND SPEED 7.6
RESULTANT WIND SPEED/DIRECTION 2/240
HIGHEST WIND SPEED/DIRECTION 47/230 DATE 05/13
HIGHEST GUST SPEED/DIRECTION 64/240 DATE 05/13
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.21
NUMBER OF DAYS FAIR 24
NUMBER OF DAYS PC 5
NUMBER OF DAYS CLOUDY 2
AVERAGE RH (PERCENT) 46
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 4 MIXED PRECIP 0
HEAVY RAIN 1 RAIN 3
LIGHT RAIN 11 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 1 SNOW 2
LIGHT SNOW 4 SLEET 0
FOG 4 FOG W/VIS <= 1/4 MILE 2
HAZE 1
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
LOOKING AHEAD TO JUNE 2026. THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 72 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 44 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 84
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 2. THE AVERAGE MONTHLY
PRECIPITATION IS 1.08 INCHES. THE AVERAGE SNOWFALL IS 0.1 INCHES.
$$