Climatological Report (Monthly)
Issued by NWS Billings, MT
Issued by NWS Billings, MT
044
CXUS55 KBYZ 012115
CLMBIL
CLIMATE REPORT
NATIONAL WEATHER SERVICE BILLINGS MT
314 PM MDT WED OCT 01 2025
...................................
...THE BILLINGS MT CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2025...
CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1934 TO 2025
WEATHER OBSERVED NORMAL DEPART
VALUE DATE(S) VALUE FROM
NORMAL
................................................
TEMPERATURE (F)
HIGHEST 92 09/02
LOWEST 43 09/06
AVG. MAXIMUM 78.8 74.3 4.5
AVG. MINIMUM 52.6 48.6 4.0
MEAN 65.7 61.4 4.3
DAYS MAX >= 90 2
DAYS MAX <= 32 0
DAYS MIN <= 32 0
DAYS MIN <= 0 0
PRECIPITATION (INCHES)
TOTALS 0.94 1.36 -0.42
DAYS >= .01 6
DAYS >= .10 4
DAYS >= .50 0
DAYS >= 1.00 0
GREATEST
24 HR. TOTAL 0.41 09/13 TO 09/13
SNOWFALL (INCHES)
TOTALS 0.0 0.3 -0.3
SINCE 7/1 T 0.3 -0.3
SNOWDEPTH AVG. 0
DAYS >= TRACE 0
DAYS >= 1.0 0
GREATEST
SNOW DEPTH 0
24 HR TOTAL MM
DEGREE DAYS
HEATING TOTAL 47 168 -121
SINCE 7/1 63 204 -141
COOLING TOTAL 73 62 11
SINCE 1/1 658 657 1
................................................
WIND (MPH)
AVERAGE WIND SPEED 8.5
HIGHEST WIND SPEED/DIRECTION 38/270 DATE 09/07
HIGHEST GUST SPEED/DIRECTION 57/270 DATE 09/07
AVERAGE RH (PERCENT) 50
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 6 MIXED PRECIP 0
HEAVY RAIN 0 RAIN 4
LIGHT RAIN 9 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 3 FOG W/VIS <= 1/4 MILE 0
HAZE 4
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
&&
...SEPTEMBER 2025 MONTH IN REVIEW FOR BILLINGS...
BELOW IS A SUMMARY OF THE TEMPERATURE...PRECIPITATION...AND WIND
STATISTICS FOR BILLINGS FOR SEPTEMBER 2025. ALL TEMPERATURES ARE IN
DEGREES FAHRENHEIT AND ALL PRECIPITATION AMOUNTS ARE IN INCHES. NORMALS
ARE 30 YEAR AVERAGES CALCULATED FROM 1991 TO 2020. MONTHLY RANKINGS
FOR PRECIPITATION...SNOWFALL...AND TEMPERATURES USE A PERIOD OF RECORD
THAT STARTED IN AUGUST 1934 AT THE BILLINGS AIRPORT. MONTHLY RANKINGS
FOR WIND USE A PERIOD OF RECORD THAT STARTED IN 1984.
NUMBERS DENOTED WITH AN * IS MISSING DATA IN THE CALCULATION.
...BILLINGS MONTHLY PRECIPITATION...
MONTH 2025 VALUES NORMALS DEPARTURE RANKING
SEPTEMBER 0.94 1.36 -0.42 36TH DRIEST OUT OF 92 YEARS
(RECORD DRIEST WAS T IN 2012)
(DRIEST SINCE 0.57 IN 2023)
...BILLINGS SEPTEMBER 2025 BROKEN OR TIED DAILY PRECIPITATION RECORDS...
NONE
...BILLINGS MONTHLY SNOWFALL...
MONTH 2025 VALUES NORMALS DEPARTURE RANKING
SEPTEMBER 0.0* 0.3 0.3 TIED FOR THE RECORD LEAST SNOWIEST OUT OF 92 YEARS
(OLD RECORD LEAST SNOWIEST WAS 0.0 TIED IN 2024)
...BILLINGS SEPTEMBER 2025 BROKEN OR TIED DAILY SNOWFALL RECORDS...
NONE
...BILLINGS AVERAGE TEMPERATURES...
MONTH 2025 VALUES NORMALS DEPARTURE RANKING
SEPTEMBER 65.7 61.4 +4.3 9TH WARMEST OUT OF 92 YEARS
(RECORD WARMEST WAS 67.2 IN 1938)
(WARMEST SINCE 66.9 IN 2024)
...BILLINGS AVERAGE HIGH TEMPERATURES...
MONTH 2025 VALUES NORMALS DEPARTURE RANKING
SEPTEMBER 78.8 74.3 +4.5 TIED FOR THE 12TH WARMEST OUT OF 92 YEARS
(RECORD WARMEST WAS 82.4 IN 1938)
(WARMEST SINCE 80.8 IN 2024)
...BILLINGS SEPTEMBER 2025 BROKEN OR TIED WARMEST DAILY HIGH TEMPERATURE RECORDS...
NONE
...BILLINGS SEPTEMBER 2025 BROKEN OR TIED COLDEST DAILY HIGH TEMPERATURE RECORDS...
NONE
...BILLINGS AVERAGE LOW TEMPERATURES...
MONTH 2025 VALUES NORMALS DEPARTURE RANKING
SEPTEMBER 52.6 48.6 +4.0 TIED FOR THE 6TH WARMEST OUT OF 92 YEARS
(RECORD WARMEST WAS 53.8 IN 1940)
(WARMEST SINCE 52.9 IN 2024)
...BILLINGS SEPTEMBER 2025 BROKEN OR TIED WARMEST DAILY LOW TEMPERATURE RECORDS...
NONE
...BILLINGS SEPTEMBER 2025 BROKEN OR TIED COLDEST DAILY LOW TEMPERATURE RECORDS...
NONE
...BILLINGS MONTHLY WIND AVERAGES...
MONTH 2025 VALUES NORMALS DEPARTURE RANKING
SEPTEMBER 8.1 9.5 -1.4 4TH LEAST WINDIEST OUT OF 76 YEARS
(RECORD LEAST WINDIEST WAS 7.7 IN 2008)
(LEAST WINDIEST SINCE 8.0 IN 2012)
$$