Record envelope, standing records and threshold days for Zortman (USC00249900), Montana, United States, with 62 years of record.
Key Facts for Zortman
Zortman (USC00249900) is a weather station in Montana, United States at 47.92 latitude and -108.52 longitude, 1,230 m (4,035 ft) above sea level.
The station reports from 1965 to 2026, 62 years of record.
1,464 records set at Zortman still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Zortman set a daily record precipitation of 25.7 mm (1.0 in) on 14 August 2026.
About the Station
Location: Montana, United States, 47.92 latitude, -108.52 longitude.
Elevation: 1,230 m (4,035 ft).
Period of record: 1965 to 2026, 62 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 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 Zortman. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Zortman, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
20.6 C (69.1 F)
-37.2 C (-35.0 F)
n/a
n/a
Feb
20.6 C (69.1 F)
-36.1 C (-33.0 F)
n/a
n/a
Mar
22.8 C (73.0 F)
-32.8 C (-27.0 F)
n/a
n/a
Apr
29.4 C (84.9 F)
-21.1 C (-6.0 F)
n/a
n/a
May
32.2 C (90.0 F)
-16.1 C (3.0 F)
n/a
n/a
Jun
37.2 C (99.0 F)
-3.3 C (26.1 F)
n/a
n/a
Jul
37.8 C (100.0 F)
-2.2 C (28.0 F)
n/a
n/a
Aug
38.3 C (100.9 F)
-3.3 C (26.1 F)
n/a
n/a
Sep
35.6 C (96.1 F)
-13.9 C (7.0 F)
n/a
n/a
Oct
30.6 C (87.1 F)
-22.2 C (-8.0 F)
n/a
n/a
Nov
27.2 C (81.0 F)
-32.2 C (-26.0 F)
n/a
n/a
Dec
19.4 C (66.9 F)
-46.1 C (-51.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Zortman still stand. 1985 holds the most, with 54.
Standing records at Zortman by the year they were set
Year set
Standing records
1965
17
1966
33
1967
23
1968
22
1969
27
1970
22
1971
26
1972
48
1973
16
1974
25
1975
17
1976
21
1977
26
1978
19
1979
11
1980
11
1981
10
1982
15
1983
4
1984
21
1985
54
1986
10
1987
22
1988
46
1989
23
1990
29
1991
54
1992
45
1993
33
1994
23
1995
17
1996
27
1997
24
1998
11
1999
20
2000
5
2001
24
2002
37
2003
34
2004
19
2005
34
2006
21
2007
21
2008
19
2009
35
2010
17
2011
14
2012
22
2013
12
2014
30
2015
24
2016
17
2017
31
2018
23
2019
29
2020
32
2021
45
2022
33
2023
16
2024
18
All-Time Record Progression
4 new records
4 all-time records were set at Zortman between 11 May 2016 and 13 January 2024. Each dot is a new record.
When Zortman set new all-time records
Date
Kind
Detail
2016-05-11
Record daily snowfall
Record daily snowfall 45.7 cm (18.0 in)
2019-06-22
Record daily precipitation
Record daily precipitation 160.0 mm (6.3 in)
2023-07-25
Record high minimum temperature
Record high minimum temperature 22.8 C (73.0 F)
2024-01-13
Record low maximum temperature
Record low maximum temperature -31.1 C (-24.0 F)
Wettest Day of Each Month
Jun: 160.0 mm (6.3 in)
The wettest day on record for each calendar month at Zortman. The most was 160.0 mm (6.3 in) on 22 June 2019.
Record daily precipitation for each month at Zortman
Month
Record daily precipitation (mm)
Date
Jan
25.4 mm (1.0 in)
20 January 2002
Feb
18.5 mm (0.7 in)
21 February 2023
Mar
28.2 mm (1.1 in)
23 March 1973
Apr
61.2 mm (2.4 in)
28 April 1970
May
127.0 mm (5.0 in)
8 May 1988
Jun
160.0 mm (6.3 in)
22 June 2019
Jul
51.1 mm (2.0 in)
19 July 1993
Aug
108.0 mm (4.3 in)
24 August 2014
Sep
90.2 mm (3.6 in)
13 September 1967
Oct
81.3 mm (3.2 in)
4 October 2016
Nov
29.5 mm (1.2 in)
13 November 2008
Dec
17.8 mm (0.7 in)
20 December 2017
Period of Record Coverage
1965 to 2024
Complete yearUnder 90 percent of days
60 years of record at Zortman, 1965 to 2024. 29 years have data for under 90 percent of days and are left out of rankings: 1965, 1973, 1974, 1975, 1979, 1980, 1981, 1982 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 30 complete years at Zortman, 1966 to 2023. Blue stripes are years cooler than the station's own mean of 5.8 C (42.5 F); red stripes are warmer. The coolest year was 1978, at 3.9 C (39.1 F), and the warmest was 2015, at 7.3 C (45.2 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Zortman as warming stripes, 1966 to 2023
Year
Annual mean temperature
Difference from the station mean
1966
5.8 C
+0.00 C
1968
5.5 C
-0.29 C
1969
5.1 C
-0.76 C
1970
5.2 C
-0.64 C
1971
5.3 C
-0.52 C
1972
4.4 C
-1.38 C
1976
6.9 C
+1.09 C
1977
6.1 C
+0.25 C
1978
3.9 C
-1.87 C
1992
6.7 C
+0.84 C
1993
4.4 C
-1.41 C
2002
5.1 C
-0.70 C
2004
6.1 C
+0.24 C
2005
6.2 C
+0.38 C
2006
7.2 C
+1.35 C
2007
6.6 C
+0.74 C
2008
5.1 C
-0.71 C
2009
4.9 C
-0.90 C
2011
5.3 C
-0.50 C
2012
7.1 C
+1.27 C
2013
5.8 C
-0.04 C
2014
5.4 C
-0.43 C
2015
7.3 C
+1.53 C
2016
7.3 C
+1.45 C
2018
5.4 C
-0.40 C
2019
4.3 C
-1.51 C
2020
6.4 C
+0.63 C
2021
6.9 C
+1.11 C
2022
5.8 C
-0.01 C
2023
6.9 C
+1.10 C
The fitted trend in annual mean temperature here over 1966 to 2023 is 0.17 C (0.00 to 0.35) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.31 F (-0.01 to 0.63) per decade. The slope is a straight line fitted to 30 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Zortman
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.17 C (0.00 to 0.35) per decade
0.31 F (-0.01 to 0.63) per decade
1966 to 2023
30
Not clearly different from zero
Mean daily maximum
-0.05 C (-0.25 to 0.16) per decade
-0.1 F (-0.4 to 0.3) per decade
1966 to 2023
30
Not clearly different from zero
Mean daily minimum
0.4 C (0.2 to 0.6) per decade
0.7 F (0.4 to 1.0) per decade
1966 to 2023
30
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
1965 to 2026
Yearly extremes at Zortman: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
38.3 C (100.9 F)
1971
34.4 C (93.9 F)
60
Coldest night (TNn)
-46.1 C (-51.0 F)
1990
-31.4 C (-24.5 F)
60
Wettest day (Rx1day)
160.0 mm (6.3 in)
2019
40.6 mm (1.6 in)
62
Wettest five days (Rx5day)
215.7 mm (8.5 in)
1969
68.4 mm (2.7 in)
62
Longest dry spell (CDD)
91 days
1981
28 days
62
Hottest day (TXx)
The hottest day of the year at Zortman, 1965 to 2026. The record is 38.3 C (100.9 F) in 1971, marked on the chart; the median year is 34.4 C (93.9 F).
Hottest day (TXx) at Zortman by year
Year
Hottest day (TXx)
1965
25.0 C (77.0 F)
1966
36.1 C (97.0 F)
1967
33.9 C (93.0 F)
1968
34.4 C (93.9 F)
1969
36.7 C (98.1 F)
1970
35.0 C (95.0 F)
1971
38.3 C (100.9 F)
1972
33.3 C (91.9 F)
1973
35.0 C (95.0 F)
1974
33.3 C (91.9 F)
1975
34.4 C (93.9 F)
1976
35.0 C (95.0 F)
1977
31.7 C (89.1 F)
1978
32.8 C (91.0 F)
1979
34.4 C (93.9 F)
1980
32.2 C (90.0 F)
1981
33.9 C (93.0 F)
1982
32.2 C (90.0 F)
1983
27.2 C (81.0 F)
1984
36.7 C (98.1 F)
1985
35.6 C (96.1 F)
1986
17.2 C (63.0 F)
1987
37.2 C (99.0 F)
1988
36.1 C (97.0 F)
1989
33.3 C (91.9 F)
1990
35.0 C (95.0 F)
1991
35.0 C (95.0 F)
1992
33.3 C (91.9 F)
1993
31.1 C (88.0 F)
1994
33.9 C (93.0 F)
1995
34.4 C (93.9 F)
1996
35.6 C (96.1 F)
1997
32.8 C (91.0 F)
1998
35.0 C (95.0 F)
1999
35.0 C (95.0 F)
2000
23.3 C (73.9 F)
2001
36.1 C (97.0 F)
2002
35.6 C (96.1 F)
2003
37.8 C (100.0 F)
2004
35.6 C (96.1 F)
2005
35.0 C (95.0 F)
2006
36.7 C (98.1 F)
2007
37.2 C (99.0 F)
2008
35.6 C (96.1 F)
2009
32.8 C (91.0 F)
2010
33.9 C (93.0 F)
2011
34.4 C (93.9 F)
2012
35.6 C (96.1 F)
2013
35.6 C (96.1 F)
2014
32.2 C (90.0 F)
2015
34.4 C (93.9 F)
2016
33.3 C (91.9 F)
2017
34.4 C (93.9 F)
2018
37.8 C (100.0 F)
2019
32.2 C (90.0 F)
2020
34.4 C (93.9 F)
2021
36.7 C (98.1 F)
2022
36.7 C (98.1 F)
2023
37.2 C (99.0 F)
2024
27.8 C (82.0 F)
2025
n/a
2026
n/a
Coldest night (TNn)
The coldest night of the year at Zortman, 1965 to 2026. The record is -46.1 C (-51.0 F) in 1990, marked on the chart; the median year is -31.4 C (-24.5 F).
Coldest night (TNn) at Zortman by year
Year
Coldest night (TNn)
1965
-27.2 C (-17.0 F)
1966
-31.1 C (-24.0 F)
1967
-30.0 C (-22.0 F)
1968
-39.4 C (-38.9 F)
1969
-36.1 C (-33.0 F)
1970
-31.1 C (-24.0 F)
1971
-34.4 C (-29.9 F)
1972
-37.2 C (-35.0 F)
1973
-28.3 C (-18.9 F)
1974
-34.4 C (-29.9 F)
1975
-28.3 C (-18.9 F)
1976
-32.2 C (-26.0 F)
1977
-37.2 C (-35.0 F)
1978
-32.8 C (-27.0 F)
1979
-33.3 C (-27.9 F)
1980
-31.7 C (-25.1 F)
1981
-27.8 C (-18.0 F)
1982
-28.3 C (-18.9 F)
1983
-21.7 C (-7.1 F)
1984
-35.6 C (-32.1 F)
1985
-32.2 C (-26.0 F)
1986
-27.8 C (-18.0 F)
1987
-23.3 C (-9.9 F)
1988
-28.3 C (-18.9 F)
1989
-37.2 C (-35.0 F)
1990
-46.1 C (-51.0 F)
1991
-37.2 C (-35.0 F)
1992
-31.7 C (-25.1 F)
1993
-31.7 C (-25.1 F)
1994
-36.1 C (-33.0 F)
1995
-31.1 C (-24.0 F)
1996
-34.4 C (-29.9 F)
1997
-32.2 C (-26.0 F)
1998
-32.2 C (-26.0 F)
1999
-25.0 C (-13.0 F)
2000
-27.8 C (-18.0 F)
2001
-19.4 C (-2.9 F)
2002
-27.2 C (-17.0 F)
2003
-29.4 C (-20.9 F)
2004
-32.2 C (-26.0 F)
2005
-31.1 C (-24.0 F)
2006
-33.9 C (-29.0 F)
2007
-26.7 C (-16.1 F)
2008
-33.3 C (-27.9 F)
2009
-32.8 C (-27.0 F)
2010
-26.7 C (-16.1 F)
2011
-29.4 C (-20.9 F)
2012
-28.9 C (-20.0 F)
2013
-32.8 C (-27.0 F)
2014
-30.6 C (-23.1 F)
2015
-24.4 C (-11.9 F)
2016
-28.9 C (-20.0 F)
2017
-28.9 C (-20.0 F)
2018
-28.3 C (-18.9 F)
2019
-31.7 C (-25.1 F)
2020
-29.4 C (-20.9 F)
2021
-33.3 C (-27.9 F)
2022
-32.2 C (-26.0 F)
2023
-28.9 C (-20.0 F)
2024
-36.7 C (-34.1 F)
2025
n/a
2026
n/a
Wettest day (Rx1day)
The wettest day of the year at Zortman, 1965 to 2026. The record is 160.0 mm (6.3 in) in 2019, marked on the chart; the median year is 40.6 mm (1.6 in).
Wettest day (Rx1day) at Zortman by year
Year
Wettest day (Rx1day)
1965
21.8 mm (0.9 in)
1966
43.2 mm (1.7 in)
1967
90.2 mm (3.6 in)
1968
40.1 mm (1.6 in)
1969
107.7 mm (4.2 in)
1970
61.2 mm (2.4 in)
1971
17.0 mm (0.7 in)
1972
86.4 mm (3.4 in)
1973
68.6 mm (2.7 in)
1974
54.6 mm (2.1 in)
1975
97.3 mm (3.8 in)
1976
47.8 mm (1.9 in)
1977
42.4 mm (1.7 in)
1978
59.9 mm (2.4 in)
1979
18.0 mm (0.7 in)
1980
40.6 mm (1.6 in)
1981
32.3 mm (1.3 in)
1982
29.5 mm (1.2 in)
1983
18.3 mm (0.7 in)
1984
33.0 mm (1.3 in)
1985
34.8 mm (1.4 in)
1986
10.2 mm (0.4 in)
1987
34.3 mm (1.4 in)
1988
127.0 mm (5.0 in)
1989
45.7 mm (1.8 in)
1990
16.3 mm (0.6 in)
1991
46.0 mm (1.8 in)
1992
33.5 mm (1.3 in)
1993
51.1 mm (2.0 in)
1994
29.2 mm (1.1 in)
1995
34.8 mm (1.4 in)
1996
26.7 mm (1.1 in)
1997
93.2 mm (3.7 in)
1998
26.7 mm (1.1 in)
1999
28.7 mm (1.1 in)
2000
18.5 mm (0.7 in)
2001
50.8 mm (2.0 in)
2002
43.2 mm (1.7 in)
2003
24.1 mm (0.9 in)
2004
20.6 mm (0.8 in)
2005
36.1 mm (1.4 in)
2006
40.6 mm (1.6 in)
2007
74.2 mm (2.9 in)
2008
63.2 mm (2.5 in)
2009
21.1 mm (0.8 in)
2010
71.4 mm (2.8 in)
2011
88.9 mm (3.5 in)
2012
44.7 mm (1.8 in)
2013
58.9 mm (2.3 in)
2014
108.0 mm (4.3 in)
2015
64.5 mm (2.5 in)
2016
81.3 mm (3.2 in)
2017
25.7 mm (1.0 in)
2018
29.5 mm (1.2 in)
2019
160.0 mm (6.3 in)
2020
27.2 mm (1.1 in)
2021
22.4 mm (0.9 in)
2022
29.7 mm (1.2 in)
2023
40.9 mm (1.6 in)
2024
79.0 mm (3.1 in)
2025
29.2 mm (1.1 in)
2026
38.9 mm (1.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Zortman, 1965 to 2026. The record is 215.7 mm (8.5 in) in 1969, marked on the chart; the median year is 68.4 mm (2.7 in).
Wettest five days (Rx5day) at Zortman by year
Year
Wettest five days (Rx5day)
1965
31.0 mm (1.2 in)
1966
44.5 mm (1.8 in)
1967
172.8 mm (6.8 in)
1968
76.2 mm (3.0 in)
1969
215.7 mm (8.5 in)
1970
85.9 mm (3.4 in)
1971
33.0 mm (1.3 in)
1972
121.2 mm (4.8 in)
1973
114.4 mm (4.5 in)
1974
100.4 mm (4.0 in)
1975
122.7 mm (4.8 in)
1976
85.7 mm (3.4 in)
1977
77.0 mm (3.0 in)
1978
112.5 mm (4.4 in)
1979
32.5 mm (1.3 in)
1980
52.3 mm (2.1 in)
1981
54.6 mm (2.1 in)
1982
38.1 mm (1.5 in)
1983
31.3 mm (1.2 in)
1984
51.8 mm (2.0 in)
1985
66.1 mm (2.6 in)
1986
12.7 mm (0.5 in)
1987
45.2 mm (1.8 in)
1988
127.0 mm (5.0 in)
1989
83.4 mm (3.3 in)
1990
31.6 mm (1.2 in)
1991
68.3 mm (2.7 in)
1992
88.2 mm (3.5 in)
1993
160.2 mm (6.3 in)
1994
53.0 mm (2.1 in)
1995
68.6 mm (2.7 in)
1996
50.6 mm (2.0 in)
1997
116.1 mm (4.6 in)
1998
25.4 mm (1.0 in)
1999
38.1 mm (1.5 in)
2000
21.1 mm (0.8 in)
2001
90.2 mm (3.6 in)
2002
87.1 mm (3.4 in)
2003
32.0 mm (1.3 in)
2004
40.1 mm (1.6 in)
2005
56.2 mm (2.2 in)
2006
53.3 mm (2.1 in)
2007
110.2 mm (4.3 in)
2008
176.9 mm (7.0 in)
2009
39.9 mm (1.6 in)
2010
110.0 mm (4.3 in)
2011
182.1 mm (7.2 in)
2012
54.3 mm (2.1 in)
2013
174.0 mm (6.9 in)
2014
169.5 mm (6.7 in)
2015
80.0 mm (3.1 in)
2016
134.9 mm (5.3 in)
2017
48.0 mm (1.9 in)
2018
46.5 mm (1.8 in)
2019
196.1 mm (7.7 in)
2020
43.2 mm (1.7 in)
2021
39.6 mm (1.6 in)
2022
72.1 mm (2.8 in)
2023
63.8 mm (2.5 in)
2024
170.7 mm (6.7 in)
2025
53.1 mm (2.1 in)
2026
75.5 mm (3.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Zortman, 1965 to 2026. The record is 91 days in 1981, marked on the chart; the median year is 28 days.
Longest dry spell (CDD) at Zortman by year
Year
Longest dry spell (CDD)
1965
64 days
1966
38 days
1967
48 days
1968
33 days
1969
70 days
1970
33 days
1971
38 days
1972
51 days
1973
50 days
1974
31 days
1975
15 days
1976
31 days
1977
30 days
1978
25 days
1979
26 days
1980
43 days
1981
91 days
1982
46 days
1983
23 days
1984
36 days
1985
53 days
1986
13 days
1987
70 days
1988
39 days
1989
28 days
1990
47 days
1991
29 days
1992
27 days
1993
17 days
1994
67 days
1995
36 days
1996
28 days
1997
45 days
1998
15 days
1999
16 days
2000
27 days
2001
34 days
2002
33 days
2003
19 days
2004
28 days
2005
20 days
2006
22 days
2007
28 days
2008
14 days
2009
22 days
2010
24 days
2011
4 days
2012
27 days
2013
15 days
2014
20 days
2015
22 days
2016
33 days
2017
42 days
2018
22 days
2019
22 days
2020
20 days
2021
29 days
2022
17 days
2023
21 days
2024
27 days
2025
18 days
2026
40 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
30 years with a frost
Across 30 years with a frost, the median last spring frost at Zortman falls on 20 May and the median first autumn frost on 21 September, which leaves a median of 122 days between them.
Fitted over all years, the growing season changes by +1.6 days per decade at this station.
Frost dates and growing season at Zortman
Measure
Median, all years
Earliest period
Recent period (1966 to 2023)
Recent against earliest
Fitted trend
Last spring frost
20 May
n/a
20 May
n/a
-0.6 days per decade
First autumn frost
21 September
n/a
21 September
n/a
+1.0 days per decade
Growing days
122 days
n/a
122 days
n/a
+1.6 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.
Download the Data
Data for Zortman standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Zortman 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.