Record envelope, standing records and threshold days for Missoula 6 NW WFO (USC00245740), Montana, United States, with 134 years of record.
Key Facts for Missoula 6 NW WFO
Missoula 6 NW WFO (USC00245740) is a weather station in Montana, United States at 46.92 latitude and -114.09 longitude, 974 m (3,197 ft) above sea level.
The station reports from 1893 to 2026, 134 years of record.
1,464 records set at Missoula 6 NW WFO still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Missoula 6 NW WFO set a daily record precipitation of 26.4 mm (1.0 in) on 29 June 2026.
About the Station
Location: Montana, United States, 46.92 latitude, -114.09 longitude.
Elevation: 974 m (3,197 ft).
Period of record: 1893 to 2026, 134 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
10 days at or beyond a record
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Missoula 6 NW WFO. The lines show the 2026 daily maximum and minimum. 10 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Missoula 6 NW WFO, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
16.1 C (61.0 F)
-36.7 C (-34.1 F)
12.8 C (55.0 F)
-13.9 C (7.0 F)
Feb
18.3 C (64.9 F)
-33.3 C (-27.9 F)
13.9 C (57.0 F)
-9.4 C (15.1 F)
Mar
25.6 C (78.1 F)
-23.9 C (-11.0 F)
24.4 C (75.9 F)
-8.3 C (17.1 F)
Apr
32.2 C (90.0 F)
-16.7 C (1.9 F)
27.8 C (82.0 F)
-3.3 C (26.1 F)
May
36.1 C (97.0 F)
-6.7 C (19.9 F)
29.4 C (84.9 F)
-2.2 C (28.0 F)
Jun
39.4 C (102.9 F)
-3.3 C (26.1 F)
30.0 C (86.0 F)
0.6 C (33.1 F)
Jul
40.6 C (105.1 F)
-2.8 C (27.0 F)
37.8 C (100.0 F)
7.8 C (46.0 F)
Aug
40.0 C (104.0 F)
-3.9 C (25.0 F)
35.0 C (95.0 F)
3.9 C (39.0 F)
Sep
36.1 C (97.0 F)
-9.4 C (15.1 F)
30.6 C (87.1 F)
-0.6 C (30.9 F)
Oct
28.9 C (84.0 F)
-20.0 C (-4.0 F)
27.2 C (81.0 F)
2.2 C (36.0 F)
Nov
20.6 C (69.1 F)
-30.6 C (-23.1 F)
n/a
n/a
Dec
18.9 C (66.0 F)
-33.3 C (-27.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Missoula 6 NW WFO still stand. 1936 holds the most, with 57.
Standing records at Missoula 6 NW WFO by the year they were set
Year set
Standing records
1893
25
1894
20
1895
16
1896
40
1897
10
1898
9
1899
18
1900
17
1901
18
1902
13
1903
15
1904
13
1905
22
1906
19
1907
14
1908
7
1909
20
1910
33
1911
13
1912
12
1913
16
1914
10
1915
7
1916
22
1917
14
1918
27
1919
27
1920
7
1923
4
1924
26
1925
8
1926
16
1927
14
1928
6
1929
3
1930
15
1931
14
1932
10
1933
14
1934
19
1935
13
1936
57
1937
27
1938
23
1939
27
1940
24
1941
14
1942
13
1943
10
1944
8
1945
6
1946
6
1947
7
1948
17
1949
18
1950
14
1951
14
1952
8
1953
21
1954
11
1955
19
1956
9
1957
15
1958
7
1959
10
1960
22
1961
14
1962
9
1963
12
1964
14
1965
10
1966
9
2002
4
2003
20
2004
12
2005
8
2006
14
2007
17
2008
10
2009
16
2010
12
2011
5
2012
9
2013
14
2014
14
2015
26
2016
16
2017
7
2018
6
2019
15
2020
18
2021
26
2022
21
2023
15
2024
15
2025
13
2026
10
All-Time Record Progression
8 new records
8 all-time records were set at Missoula 6 NW WFO between 5 November 1927 and 4 February 2017. Each dot is a new record.
When Missoula 6 NW WFO set new all-time records
Date
Kind
Detail
1927-11-05
Record daily precipitation
Record daily precipitation 58.9 mm (2.3 in)
1933-02-10
Record low minimum temperature
Record low minimum temperature -33.3 C (-27.9 F)
1936-02-07
Record low maximum temperature
Record low maximum temperature -23.9 C (-11.0 F)
1936-02-12
Record daily snowfall
Record daily snowfall 50.0 cm (19.7 in)
1936-07-22
Record high maximum temperature
Record high maximum temperature 40.6 C (105.1 F)
1939-07-27
Record high minimum temperature
Record high minimum temperature 22.2 C (72.0 F)
1957-01-26
Record low minimum temperature
Record low minimum temperature -36.7 C (-34.1 F)
2017-02-04
Record snow depth
Record snow depth 40.6 cm (16.0 in)
Wettest Day of Each Month
Nov: 58.9 mm (2.3 in)
The wettest day on record for each calendar month at Missoula 6 NW WFO. The most was 58.9 mm (2.3 in) on 5 November 1927.
Record daily precipitation for each month at Missoula 6 NW WFO
Month
Record daily precipitation (mm)
Date
Jan
27.9 mm (1.1 in)
30 January 1907
Feb
27.9 mm (1.1 in)
7 February 1918
Mar
26.9 mm (1.1 in)
14 March 1908
Apr
48.3 mm (1.9 in)
30 April 1951
May
41.4 mm (1.6 in)
20 May 1957
Jun
44.2 mm (1.7 in)
4 June 1905
Jul
39.9 mm (1.6 in)
3 July 1956
Aug
51.6 mm (2.0 in)
7 August 2009
Sep
39.1 mm (1.5 in)
9 September 1931
Oct
48.8 mm (1.9 in)
7 October 1893
Nov
58.9 mm (2.3 in)
5 November 1927
Dec
35.6 mm (1.4 in)
23 December 1917
Period of Record Coverage
1893 to 2026
Complete yearUnder 90 percent of days
97 years of record at Missoula 6 NW WFO, 1893 to 2026. 15 years have data for under 90 percent of days and are left out of rankings: 1893, 1898, 1900, 1901, 1903, 1906, 1908, 1914 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 76 complete years at Missoula 6 NW WFO, 1895 to 2025. Blue stripes are years cooler than the station's own mean of 7.6 C (45.6 F); red stripes are warmer. The coolest year was 1916, at 5.0 C (41.0 F), and the warmest was 1934, at 9.5 C (49.1 F). The strongest colour marks a difference of 2.6 C (4.7 F).
Annual mean temperature at Missoula 6 NW WFO as warming stripes, 1895 to 2025
Year
Annual mean temperature
Difference from the station mean
1895
5.2 C
-2.40 C
1896
6.0 C
-1.57 C
1897
6.5 C
-1.02 C
1899
6.7 C
-0.91 C
1902
7.3 C
-0.31 C
1904
8.8 C
+1.20 C
1905
7.1 C
-0.51 C
1910
7.9 C
+0.37 C
1911
6.6 C
-0.93 C
1912
7.0 C
-0.52 C
1915
7.2 C
-0.40 C
1916
5.0 C
-2.55 C
1918
7.5 C
-0.09 C
1919
6.4 C
-1.13 C
1925
8.5 C
+0.92 C
1926
8.1 C
+0.57 C
1927
6.7 C
-0.85 C
1928
7.1 C
-0.46 C
1929
6.6 C
-0.95 C
1930
6.8 C
-0.76 C
1931
7.7 C
+0.09 C
1932
6.7 C
-0.90 C
1933
7.6 C
+0.02 C
1934
9.5 C
+1.93 C
1935
7.2 C
-0.40 C
1936
8.2 C
+0.64 C
1937
7.9 C
+0.37 C
1938
8.7 C
+1.15 C
1939
9.0 C
+1.46 C
1940
9.3 C
+1.77 C
1941
8.9 C
+1.35 C
1942
7.7 C
+0.10 C
1943
7.0 C
-0.60 C
1944
7.5 C
-0.02 C
1946
7.5 C
-0.11 C
1947
7.4 C
-0.20 C
1948
5.9 C
-1.66 C
1949
6.5 C
-1.05 C
1950
6.4 C
-1.18 C
1951
6.5 C
-1.08 C
1952
7.2 C
-0.34 C
1953
8.9 C
+1.35 C
1954
7.6 C
+0.08 C
1955
5.7 C
-1.84 C
1956
7.1 C
-0.47 C
1957
7.4 C
-0.13 C
1958
8.8 C
+1.22 C
1959
6.9 C
-0.66 C
1960
7.0 C
-0.53 C
1961
8.0 C
+0.44 C
1962
7.0 C
-0.58 C
1963
7.2 C
-0.37 C
1964
6.3 C
-1.30 C
1965
7.2 C
-0.33 C
2003
8.4 C
+0.85 C
2004
8.0 C
+0.40 C
2005
7.7 C
+0.09 C
2006
8.8 C
+1.19 C
2007
8.7 C
+1.18 C
2008
7.4 C
-0.20 C
2009
7.6 C
+0.00 C
2010
7.7 C
+0.14 C
2011
7.3 C
-0.23 C
2012
8.7 C
+1.13 C
2013
8.2 C
+0.66 C
2014
8.0 C
+0.40 C
2015
9.3 C
+1.77 C
2016
8.6 C
+0.99 C
2018
7.9 C
+0.35 C
2019
7.0 C
-0.55 C
2020
8.4 C
+0.79 C
2021
8.9 C
+1.34 C
2022
7.5 C
-0.06 C
2023
8.5 C
+0.90 C
2024
8.9 C
+1.37 C
2025
9.1 C
+1.53 C
The annual mean temperature here has risen by 0.1 C (0.1 to 0.2) per decade over 1895 to 2025. In Fahrenheit: 0.2 F (0.1 to 0.3) per decade. The slope is a straight line fitted to 76 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Missoula 6 NW WFO
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.1 C (0.1 to 0.2) per decade
0.2 F (0.1 to 0.3) per decade
1895 to 2025
76
Rise
Mean daily maximum
0.05 C (-0.01 to 0.10) per decade
0.08 F (-0.01 to 0.17) per decade
1895 to 2025
76
Not clearly different from zero
Mean daily minimum
0.2 C (0.1 to 0.2) per decade
0.3 F (0.2 to 0.4) per decade
1895 to 2025
76
Rise
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1893 to 2026
Yearly extremes at Missoula 6 NW WFO: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.6 C (105.1 F)
1936
37.2 C (99.0 F)
97
Coldest night (TNn)
-36.7 C (-34.1 F)
1957
-25.6 C (-14.1 F)
97
Wettest day (Rx1day)
58.9 mm (2.3 in)
1927
23.1 mm (0.9 in)
97
Wettest five days (Rx5day)
115.2 mm (4.5 in)
1908
40.4 mm (1.6 in)
97
Longest dry spell (CDD)
92 days
1917
27 days
97
Hottest day (TXx)
The hottest day of the year at Missoula 6 NW WFO, 1893 to 2026. The record is 40.6 C (105.1 F) in 1936, marked on the chart; the median year is 37.2 C (99.0 F).
Hottest day (TXx) at Missoula 6 NW WFO by year
Year
Hottest day (TXx)
1893
38.3 C (100.9 F)
1894
36.7 C (98.1 F)
1895
34.4 C (93.9 F)
1896
36.1 C (97.0 F)
1897
35.0 C (95.0 F)
1898
34.4 C (93.9 F)
1899
37.8 C (100.0 F)
1900
35.0 C (95.0 F)
1901
37.8 C (100.0 F)
1902
36.1 C (97.0 F)
1903
34.4 C (93.9 F)
1904
36.7 C (98.1 F)
1905
36.7 C (98.1 F)
1906
37.2 C (99.0 F)
1907
33.3 C (91.9 F)
1908
38.3 C (100.9 F)
1909
36.1 C (97.0 F)
1910
38.9 C (102.0 F)
1911
35.6 C (96.1 F)
1912
36.1 C (97.0 F)
1913
36.7 C (98.1 F)
1914
37.8 C (100.0 F)
1915
35.0 C (95.0 F)
1916
36.7 C (98.1 F)
1917
37.2 C (99.0 F)
1918
38.3 C (100.9 F)
1919
39.4 C (102.9 F)
1920
26.7 C (80.1 F)
1923
36.1 C (97.0 F)
1924
38.9 C (102.0 F)
1925
37.2 C (99.0 F)
1926
37.2 C (99.0 F)
1927
36.7 C (98.1 F)
1928
38.9 C (102.0 F)
1929
36.7 C (98.1 F)
1930
37.2 C (99.0 F)
1931
37.8 C (100.0 F)
1932
36.7 C (98.1 F)
1933
38.3 C (100.9 F)
1934
37.8 C (100.0 F)
1935
37.8 C (100.0 F)
1936
40.6 C (105.1 F)
1937
38.3 C (100.9 F)
1938
37.8 C (100.0 F)
1939
39.4 C (102.9 F)
1940
39.4 C (102.9 F)
1941
38.3 C (100.9 F)
1942
37.2 C (99.0 F)
1943
37.2 C (99.0 F)
1944
35.0 C (95.0 F)
1945
36.1 C (97.0 F)
1946
37.2 C (99.0 F)
1947
36.7 C (98.1 F)
1948
35.0 C (95.0 F)
1949
36.7 C (98.1 F)
1950
35.0 C (95.0 F)
1951
36.7 C (98.1 F)
1952
36.1 C (97.0 F)
1953
38.9 C (102.0 F)
1954
35.6 C (96.1 F)
1955
35.0 C (95.0 F)
1956
35.0 C (95.0 F)
1957
35.0 C (95.0 F)
1958
35.6 C (96.1 F)
1959
37.8 C (100.0 F)
1960
38.9 C (102.0 F)
1961
40.0 C (104.0 F)
1962
35.0 C (95.0 F)
1963
36.1 C (97.0 F)
1964
35.6 C (96.1 F)
1965
35.0 C (95.0 F)
1966
36.7 C (98.1 F)
2002
32.2 C (90.0 F)
2003
38.9 C (102.0 F)
2004
36.7 C (98.1 F)
2005
37.2 C (99.0 F)
2006
38.3 C (100.9 F)
2007
38.3 C (100.9 F)
2008
37.8 C (100.0 F)
2009
37.2 C (99.0 F)
2010
37.2 C (99.0 F)
2011
36.1 C (97.0 F)
2012
37.2 C (99.0 F)
2013
37.8 C (100.0 F)
2014
36.1 C (97.0 F)
2015
39.4 C (102.9 F)
2016
35.6 C (96.1 F)
2017
38.3 C (100.9 F)
2018
39.4 C (102.9 F)
2019
35.6 C (96.1 F)
2020
38.9 C (102.0 F)
2021
38.9 C (102.0 F)
2022
38.9 C (102.0 F)
2023
38.9 C (102.0 F)
2024
38.3 C (100.9 F)
2025
36.1 C (97.0 F)
2026
37.8 C (100.0 F)
Coldest night (TNn)
The coldest night of the year at Missoula 6 NW WFO, 1893 to 2026. The record is -36.7 C (-34.1 F) in 1957, marked on the chart; the median year is -25.6 C (-14.1 F).
Coldest night (TNn) at Missoula 6 NW WFO by year
Year
Coldest night (TNn)
1893
-17.2 C (1.0 F)
1894
-26.1 C (-15.0 F)
1895
-28.9 C (-20.0 F)
1896
-23.3 C (-9.9 F)
1897
-27.2 C (-17.0 F)
1898
-25.6 C (-14.1 F)
1899
-30.0 C (-22.0 F)
1900
-23.9 C (-11.0 F)
1901
-21.1 C (-6.0 F)
1902
-26.7 C (-16.1 F)
1903
-20.6 C (-5.1 F)
1904
-18.9 C (-2.0 F)
1905
-32.8 C (-27.0 F)
1906
-21.7 C (-7.1 F)
1907
-27.2 C (-17.0 F)
1908
-25.0 C (-13.0 F)
1909
-29.4 C (-20.9 F)
1910
-26.1 C (-15.0 F)
1911
-24.4 C (-11.9 F)
1912
-23.3 C (-9.9 F)
1913
-28.9 C (-20.0 F)
1914
-24.4 C (-11.9 F)
1915
-23.3 C (-9.9 F)
1916
-30.0 C (-22.0 F)
1917
-22.2 C (-8.0 F)
1918
-30.0 C (-22.0 F)
1919
-31.7 C (-25.1 F)
1920
-20.0 C (-4.0 F)
1923
-23.9 C (-11.0 F)
1924
-28.3 C (-18.9 F)
1925
-11.1 C (12.0 F)
1926
-23.3 C (-9.9 F)
1927
-31.7 C (-25.1 F)
1928
-32.8 C (-27.0 F)
1929
-29.4 C (-20.9 F)
1930
-30.6 C (-23.1 F)
1931
-22.2 C (-8.0 F)
1932
-28.3 C (-18.9 F)
1933
-33.3 C (-27.9 F)
1934
-13.9 C (7.0 F)
1935
-29.4 C (-20.9 F)
1936
-31.7 C (-25.1 F)
1937
-32.2 C (-26.0 F)
1938
-20.0 C (-4.0 F)
1939
-24.4 C (-11.9 F)
1940
-21.1 C (-6.0 F)
1941
-21.1 C (-6.0 F)
1942
-27.8 C (-18.0 F)
1943
-27.2 C (-17.0 F)
1944
-28.3 C (-18.9 F)
1945
-21.1 C (-6.0 F)
1946
-20.0 C (-4.0 F)
1947
-22.2 C (-8.0 F)
1948
-30.6 C (-23.1 F)
1949
-32.2 C (-26.0 F)
1950
-32.2 C (-26.0 F)
1951
-28.9 C (-20.0 F)
1952
-27.8 C (-18.0 F)
1953
-13.3 C (8.1 F)
1954
-25.6 C (-14.1 F)
1955
-30.6 C (-23.1 F)
1956
-31.1 C (-24.0 F)
1957
-36.7 C (-34.1 F)
1958
-16.1 C (3.0 F)
1959
-26.7 C (-16.1 F)
1960
-30.6 C (-23.1 F)
1961
-26.1 C (-15.0 F)
1962
-31.7 C (-25.1 F)
1963
-31.1 C (-24.0 F)
1964
-33.3 C (-27.9 F)
1965
-23.3 C (-9.9 F)
1966
-17.2 C (1.0 F)
2002
-15.6 C (3.9 F)
2003
-21.1 C (-6.0 F)
2004
-30.0 C (-22.0 F)
2005
-25.6 C (-14.1 F)
2006
-22.8 C (-9.0 F)
2007
-20.0 C (-4.0 F)
2008
-25.0 C (-13.0 F)
2009
-22.8 C (-9.0 F)
2010
-22.2 C (-8.0 F)
2011
-22.2 C (-8.0 F)
2012
-15.6 C (3.9 F)
2013
-25.0 C (-13.0 F)
2014
-28.9 C (-20.0 F)
2015
-20.0 C (-4.0 F)
2016
-25.0 C (-13.0 F)
2017
-27.8 C (-18.0 F)
2018
-18.3 C (-0.9 F)
2019
-22.8 C (-9.0 F)
2020
-20.0 C (-4.0 F)
2021
-20.6 C (-5.1 F)
2022
-28.9 C (-20.0 F)
2023
-23.3 C (-9.9 F)
2024
-30.0 C (-22.0 F)
2025
-26.1 C (-15.0 F)
2026
-13.9 C (7.0 F)
Wettest day (Rx1day)
The wettest day of the year at Missoula 6 NW WFO, 1893 to 2026. The record is 58.9 mm (2.3 in) in 1927, marked on the chart; the median year is 23.1 mm (0.9 in).
Wettest day (Rx1day) at Missoula 6 NW WFO by year
Year
Wettest day (Rx1day)
1893
48.8 mm (1.9 in)
1894
18.3 mm (0.7 in)
1895
12.7 mm (0.5 in)
1896
28.2 mm (1.1 in)
1897
26.4 mm (1.0 in)
1898
38.1 mm (1.5 in)
1899
18.0 mm (0.7 in)
1900
33.3 mm (1.3 in)
1901
38.6 mm (1.5 in)
1902
37.8 mm (1.5 in)
1903
31.5 mm (1.2 in)
1904
20.3 mm (0.8 in)
1905
44.2 mm (1.7 in)
1906
29.5 mm (1.2 in)
1907
27.9 mm (1.1 in)
1908
40.6 mm (1.6 in)
1909
33.3 mm (1.3 in)
1910
25.1 mm (1.0 in)
1911
37.3 mm (1.5 in)
1912
35.3 mm (1.4 in)
1913
21.1 mm (0.8 in)
1914
24.9 mm (1.0 in)
1915
20.3 mm (0.8 in)
1916
13.7 mm (0.5 in)
1917
38.1 mm (1.5 in)
1918
27.9 mm (1.1 in)
1919
20.3 mm (0.8 in)
1920
15.5 mm (0.6 in)
1923
24.4 mm (1.0 in)
1924
10.2 mm (0.4 in)
1925
24.4 mm (1.0 in)
1926
16.8 mm (0.7 in)
1927
58.9 mm (2.3 in)
1928
21.1 mm (0.8 in)
1929
21.1 mm (0.8 in)
1930
19.3 mm (0.8 in)
1931
39.1 mm (1.5 in)
1932
35.6 mm (1.4 in)
1933
19.8 mm (0.8 in)
1934
18.3 mm (0.7 in)
1935
15.7 mm (0.6 in)
1936
20.3 mm (0.8 in)
1937
18.3 mm (0.7 in)
1938
39.1 mm (1.5 in)
1939
23.1 mm (0.9 in)
1940
15.2 mm (0.6 in)
1941
18.3 mm (0.7 in)
1942
25.1 mm (1.0 in)
1943
30.7 mm (1.2 in)
1944
31.8 mm (1.3 in)
1945
15.2 mm (0.6 in)
1946
24.1 mm (0.9 in)
1947
36.3 mm (1.4 in)
1948
22.9 mm (0.9 in)
1949
21.6 mm (0.9 in)
1950
12.2 mm (0.5 in)
1951
48.3 mm (1.9 in)
1952
11.7 mm (0.5 in)
1953
24.9 mm (1.0 in)
1954
17.5 mm (0.7 in)
1955
27.7 mm (1.1 in)
1956
42.9 mm (1.7 in)
1957
41.4 mm (1.6 in)
1958
21.1 mm (0.8 in)
1959
23.4 mm (0.9 in)
1960
18.0 mm (0.7 in)
1961
26.4 mm (1.0 in)
1962
22.9 mm (0.9 in)
1963
19.3 mm (0.8 in)
1964
36.3 mm (1.4 in)
1965
24.6 mm (1.0 in)
1966
17.8 mm (0.7 in)
2002
6.4 mm (0.25 in)
2003
15.7 mm (0.6 in)
2004
27.2 mm (1.1 in)
2005
15.7 mm (0.6 in)
2006
47.5 mm (1.9 in)
2007
25.7 mm (1.0 in)
2008
22.1 mm (0.9 in)
2009
51.6 mm (2.0 in)
2010
17.8 mm (0.7 in)
2011
17.3 mm (0.7 in)
2012
21.1 mm (0.8 in)
2013
13.2 mm (0.5 in)
2014
20.3 mm (0.8 in)
2015
20.3 mm (0.8 in)
2016
17.0 mm (0.7 in)
2017
22.9 mm (0.9 in)
2018
21.3 mm (0.8 in)
2019
29.2 mm (1.1 in)
2020
25.1 mm (1.0 in)
2021
23.9 mm (0.9 in)
2022
29.5 mm (1.2 in)
2023
15.5 mm (0.6 in)
2024
18.3 mm (0.7 in)
2025
19.6 mm (0.8 in)
2026
26.4 mm (1.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Missoula 6 NW WFO, 1893 to 2026. The record is 115.2 mm (4.5 in) in 1908, marked on the chart; the median year is 40.4 mm (1.6 in).
Wettest five days (Rx5day) at Missoula 6 NW WFO by year
Year
Wettest five days (Rx5day)
1893
61.5 mm (2.4 in)
1894
24.9 mm (1.0 in)
1895
24.2 mm (1.0 in)
1896
44.2 mm (1.7 in)
1897
62.2 mm (2.4 in)
1898
71.1 mm (2.8 in)
1899
23.9 mm (0.9 in)
1900
78.0 mm (3.1 in)
1901
84.1 mm (3.3 in)
1902
67.8 mm (2.7 in)
1903
41.2 mm (1.6 in)
1904
21.6 mm (0.9 in)
1905
52.8 mm (2.1 in)
1906
52.6 mm (2.1 in)
1907
74.3 mm (2.9 in)
1908
115.2 mm (4.5 in)
1909
46.2 mm (1.8 in)
1910
32.8 mm (1.3 in)
1911
42.4 mm (1.7 in)
1912
45.7 mm (1.8 in)
1913
38.4 mm (1.5 in)
1914
44.7 mm (1.8 in)
1915
51.8 mm (2.0 in)
1916
24.9 mm (1.0 in)
1917
67.4 mm (2.7 in)
1918
32.2 mm (1.3 in)
1919
33.3 mm (1.3 in)
1920
40.4 mm (1.6 in)
1923
43.9 mm (1.7 in)
1924
26.4 mm (1.0 in)
1925
56.4 mm (2.2 in)
1926
24.6 mm (1.0 in)
1927
82.0 mm (3.2 in)
1928
33.8 mm (1.3 in)
1929
33.5 mm (1.3 in)
1930
51.5 mm (2.0 in)
1931
39.9 mm (1.6 in)
1932
57.7 mm (2.3 in)
1933
47.9 mm (1.9 in)
1934
41.4 mm (1.6 in)
1935
18.2 mm (0.7 in)
1936
32.2 mm (1.3 in)
1937
24.2 mm (1.0 in)
1938
55.7 mm (2.2 in)
1939
42.9 mm (1.7 in)
1940
20.8 mm (0.8 in)
1941
37.1 mm (1.5 in)
1942
35.8 mm (1.4 in)
1943
35.1 mm (1.4 in)
1944
33.8 mm (1.3 in)
1945
20.8 mm (0.8 in)
1946
41.9 mm (1.6 in)
1947
45.7 mm (1.8 in)
1948
45.4 mm (1.8 in)
1949
23.6 mm (0.9 in)
1950
24.1 mm (0.9 in)
1951
66.3 mm (2.6 in)
1952
25.9 mm (1.0 in)
1953
45.5 mm (1.8 in)
1954
43.2 mm (1.7 in)
1955
51.5 mm (2.0 in)
1956
47.8 mm (1.9 in)
1957
63.6 mm (2.5 in)
1958
34.2 mm (1.3 in)
1959
29.3 mm (1.2 in)
1960
30.2 mm (1.2 in)
1961
40.4 mm (1.6 in)
1962
42.7 mm (1.7 in)
1963
39.6 mm (1.6 in)
1964
60.9 mm (2.4 in)
1965
53.4 mm (2.1 in)
1966
34.1 mm (1.3 in)
2002
7.4 mm (0.29 in)
2003
39.8 mm (1.6 in)
2004
48.8 mm (1.9 in)
2005
35.6 mm (1.4 in)
2006
58.7 mm (2.3 in)
2007
31.6 mm (1.2 in)
2008
40.1 mm (1.6 in)
2009
60.5 mm (2.4 in)
2010
34.6 mm (1.4 in)
2011
33.1 mm (1.3 in)
2012
35.8 mm (1.4 in)
2013
20.1 mm (0.8 in)
2014
31.1 mm (1.2 in)
2015
23.7 mm (0.9 in)
2016
46.1 mm (1.8 in)
2017
32.4 mm (1.3 in)
2018
31.5 mm (1.2 in)
2019
49.5 mm (1.9 in)
2020
55.1 mm (2.2 in)
2021
51.2 mm (2.0 in)
2022
29.8 mm (1.2 in)
2023
33.7 mm (1.3 in)
2024
28.3 mm (1.1 in)
2025
25.4 mm (1.0 in)
2026
45.2 mm (1.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at Missoula 6 NW WFO, 1893 to 2026. The record is 92 days in 1917, marked on the chart; the median year is 27 days.
Longest dry spell (CDD) at Missoula 6 NW WFO by year
Year
Longest dry spell (CDD)
1893
15 days
1894
17 days
1895
28 days
1896
42 days
1897
24 days
1898
35 days
1899
15 days
1900
25 days
1901
23 days
1902
72 days
1903
29 days
1904
52 days
1905
24 days
1906
31 days
1907
24 days
1908
24 days
1909
31 days
1910
33 days
1911
29 days
1912
28 days
1913
21 days
1914
23 days
1915
30 days
1916
15 days
1917
92 days
1918
28 days
1919
25 days
1920
20 days
1923
29 days
1924
22 days
1925
18 days
1926
30 days
1927
18 days
1928
28 days
1929
68 days
1930
22 days
1931
34 days
1932
21 days
1933
26 days
1934
20 days
1935
37 days
1936
27 days
1937
27 days
1938
29 days
1939
38 days
1940
13 days
1941
18 days
1942
26 days
1943
22 days
1944
19 days
1945
32 days
1946
23 days
1947
18 days
1948
31 days
1949
32 days
1950
36 days
1951
42 days
1952
39 days
1953
38 days
1954
26 days
1955
45 days
1956
22 days
1957
19 days
1958
16 days
1959
23 days
1960
32 days
1961
41 days
1962
24 days
1963
26 days
1964
28 days
1965
28 days
1966
46 days
2002
30 days
2003
23 days
2004
30 days
2005
25 days
2006
32 days
2007
53 days
2008
27 days
2009
30 days
2010
25 days
2011
23 days
2012
42 days
2013
30 days
2014
21 days
2015
26 days
2016
27 days
2017
46 days
2018
50 days
2019
21 days
2020
39 days
2021
30 days
2022
30 days
2023
21 days
2024
21 days
2025
23 days
2026
31 days
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
76 years with a frost
Across 76 years with a frost, the median last spring frost at Missoula 6 NW WFO falls on 15 May and the median first autumn frost on 23 September, which leaves a median of 134 days between them.
In 1958 to 2025 the median growing season was 146 days. That is 18 days more than in 1895 to 1940.
Fitted over all years, the growing season changes by +2.9 days per decade at this station.
Frost dates and growing season at Missoula 6 NW WFO
Measure
Median, all years
Earliest period (1895 to 1940)
Recent period (1958 to 2025)
Recent against earliest
Fitted trend
Last spring frost
15 May
22 May
11 May
11 days earlier
-1.6 days per decade
First autumn frost
23 September
23 September
1 October
8 days later
+1.3 days per decade
Growing days
134 days
128 days
146 days
18 days more
+2.9 days per decade
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
83 years, 1894 to 2025
A day with at least 23.3 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 62.7 mm (2.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Missoula 6 NW WFO: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
23.3 mm (0.9 in)
5 years
31.9 mm (1.3 in)
10 years
38.3 mm (1.5 in)
25 years
47.3 mm (1.9 in)
50 years
54.7 mm (2.2 in)
100 years
62.7 mm (2.5 in)
Longer than the 83 years of record
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 83 years of values from 1894 to 2025.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 58.9 mm (2.3 in) in 1927; 51.6 mm (2.0 in) in 2009; 48.3 mm (1.9 in) in 1951.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Missoula 6 NW WFO standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Missoula 6 NW WFO threshold days by year: CSV or JSON. Field meanings are on the data page.
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-15 (15 October 2026). Records are computed by this site and are not official.