Record envelope, standing records and threshold days for Bozeman 12 NE (USC00241050), Montana, United States, with 46 years of record.
Key Facts for Bozeman 12 NE
Bozeman 12 NE (USC00241050) is a weather station in Montana, United States at 45.82 latitude and -110.88 longitude, 1,814 m (5,950 ft) above sea level.
The station reports from 1950 to 1995, 46 years of record.
1,464 records set at Bozeman 12 NE still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Bozeman 12 NE set a daily record precipitation of 10.2 mm (0.4 in) on 30 December 1995.
About the Station
Location: Montana, United States, 45.82 latitude, -110.88 longitude.
Elevation: 1,814 m (5,950 ft).
Period of record: 1950 to 1995, 46 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 Bozeman 12 NE. 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 Bozeman 12 NE, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
14.4 C (57.9 F)
-42.8 C (-45.0 F)
n/a
n/a
Feb
15.6 C (60.1 F)
-41.7 C (-43.1 F)
n/a
n/a
Mar
20.0 C (68.0 F)
-36.7 C (-34.1 F)
n/a
n/a
Apr
25.0 C (77.0 F)
-28.3 C (-18.9 F)
n/a
n/a
May
28.3 C (82.9 F)
-16.7 C (1.9 F)
n/a
n/a
Jun
32.2 C (90.0 F)
-6.7 C (19.9 F)
n/a
n/a
Jul
33.9 C (93.0 F)
-3.3 C (26.1 F)
n/a
n/a
Aug
35.0 C (95.0 F)
-6.7 C (19.9 F)
n/a
n/a
Sep
31.1 C (88.0 F)
-16.1 C (3.0 F)
n/a
n/a
Oct
28.3 C (82.9 F)
-28.9 C (-20.0 F)
n/a
n/a
Nov
20.6 C (69.1 F)
-36.1 C (-33.0 F)
n/a
n/a
Dec
20.0 C (68.0 F)
-43.9 C (-47.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Bozeman 12 NE still stand. 1951 holds the most, with 50.
Standing records at Bozeman 12 NE by the year they were set
Year set
Standing records
1950
38
1951
50
1952
13
1953
29
1954
43
1955
39
1956
29
1957
25
1958
31
1959
29
1960
39
1961
34
1962
40
1963
36
1964
28
1965
38
1966
31
1967
28
1968
23
1969
34
1970
32
1971
29
1972
37
1973
26
1974
26
1975
36
1976
18
1977
24
1978
28
1979
24
1980
32
1981
23
1982
31
1983
38
1984
33
1985
42
1986
41
1987
46
1988
41
1989
32
1990
30
1991
22
1992
29
1993
28
1994
41
1995
18
All-Time Record Progression
3 new records
3 all-time records were set at Bozeman 12 NE between 21 December 1983 and 2 February 1989. Each dot is a new record.
When Bozeman 12 NE set new all-time records
Date
Kind
Detail
1983-12-21
Record low minimum temperature
Record low minimum temperature -43.3 C (-45.9 F)
1983-12-24
Record low minimum temperature
Record low minimum temperature -43.9 C (-47.0 F)
1989-02-02
Record low maximum temperature
Record low maximum temperature -31.1 C (-24.0 F)
Wettest Day of Each Month
Jun: 93.2 mm (3.7 in)
The wettest day on record for each calendar month at Bozeman 12 NE. The most was 93.2 mm (3.7 in) on 3 June 1953.
Record daily precipitation for each month at Bozeman 12 NE
Month
Record daily precipitation (mm)
Date
Jan
39.9 mm (1.6 in)
9 January 1971
Feb
32.5 mm (1.3 in)
17 February 1981
Mar
35.6 mm (1.4 in)
28 March 1963
Apr
41.7 mm (1.6 in)
20 April 1973
May
57.9 mm (2.3 in)
30 May 1953
Jun
93.2 mm (3.7 in)
3 June 1953
Jul
57.9 mm (2.3 in)
10 July 1983
Aug
84.6 mm (3.3 in)
15 August 1968
Sep
58.4 mm (2.3 in)
8 September 1970
Oct
70.1 mm (2.8 in)
28 October 1967
Nov
43.9 mm (1.7 in)
24 November 1975
Dec
54.4 mm (2.1 in)
23 December 1955
Period of Record Coverage
1950 to 1995
Complete yearUnder 90 percent of days
46 years of record at Bozeman 12 NE, 1950 to 1995. 2 years have data for under 90 percent of days and are left out of rankings: 1950, 1952.
Cooler than the station meanWarmer than the station mean
One stripe for each of 44 complete years at Bozeman 12 NE, 1951 to 1995. Blue stripes are years cooler than the station's own mean of 3.3 C (38.0 F); red stripes are warmer. The coolest year was 1975, at 2.0 C (35.6 F), and the warmest was 1953, at 4.8 C (40.6 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Bozeman 12 NE as warming stripes, 1951 to 1995
Year
Annual mean temperature
Difference from the station mean
1951
2.5 C
-0.85 C
1953
4.8 C
+1.45 C
1954
4.2 C
+0.89 C
1955
2.4 C
-0.97 C
1956
3.7 C
+0.33 C
1957
3.2 C
-0.16 C
1958
4.5 C
+1.16 C
1959
3.4 C
+0.07 C
1960
3.6 C
+0.22 C
1961
4.4 C
+1.04 C
1962
3.6 C
+0.23 C
1963
4.0 C
+0.63 C
1964
2.6 C
-0.72 C
1965
2.9 C
-0.48 C
1966
3.7 C
+0.33 C
1967
3.3 C
-0.04 C
1968
2.5 C
-0.84 C
1969
2.7 C
-0.66 C
1970
2.7 C
-0.67 C
1971
2.6 C
-0.74 C
1972
2.9 C
-0.49 C
1973
2.9 C
-0.46 C
1974
3.4 C
+0.07 C
1975
2.0 C
-1.33 C
1976
4.0 C
+0.68 C
1977
3.3 C
-0.03 C
1978
2.5 C
-0.86 C
1979
3.0 C
-0.35 C
1980
3.5 C
+0.16 C
1981
4.1 C
+0.75 C
1982
2.2 C
-1.15 C
1983
3.1 C
-0.22 C
1984
3.0 C
-0.39 C
1985
2.2 C
-1.17 C
1986
4.0 C
+0.64 C
1987
4.2 C
+0.85 C
1988
4.4 C
+1.07 C
1989
3.1 C
-0.25 C
1990
3.9 C
+0.60 C
1991
4.1 C
+0.75 C
1992
4.0 C
+0.63 C
1993
2.3 C
-1.08 C
1994
4.3 C
+0.91 C
1995
3.7 C
+0.34 C
The fitted trend in annual mean temperature here over 1951 to 1995 is 0.01 C (-0.17 to 0.19) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.01 F (-0.31 to 0.34) per decade. The slope is a straight line fitted to 44 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Bozeman 12 NE
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.01 C (-0.17 to 0.19) per decade
0.01 F (-0.31 to 0.34) per decade
1951 to 1995
44
Not clearly different from zero
Mean daily maximum
0.26 C (0.04 to 0.47) per decade
0.5 F (0.1 to 0.8) per decade
1951 to 1995
44
Rise
Mean daily minimum
-0.2 C (-0.4 to -0.1) per decade
-0.4 F (-0.7 to -0.1) per decade
1951 to 1995
44
Fall
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
1950 to 1995
Yearly extremes at Bozeman 12 NE: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
35.0 C (95.0 F)
1961
30.9 C (87.5 F)
46
Coldest night (TNn)
-43.9 C (-47.0 F)
1983
-35.6 C (-32.1 F)
46
Wettest day (Rx1day)
93.2 mm (3.7 in)
1953
40.8 mm (1.6 in)
46
Wettest five days (Rx5day)
157.2 mm (6.2 in)
1953
73.6 mm (2.9 in)
46
Longest dry spell (CDD)
38 days
1955
19 days
46
Hottest day (TXx)
The hottest day of the year at Bozeman 12 NE, 1950 to 1995. The record is 35.0 C (95.0 F) in 1961, marked on the chart; the median year is 30.9 C (87.5 F).
Hottest day (TXx) at Bozeman 12 NE by year
Year
Hottest day (TXx)
1950
31.1 C (88.0 F)
1951
31.7 C (89.1 F)
1952
30.0 C (86.0 F)
1953
32.2 C (90.0 F)
1954
31.1 C (88.0 F)
1955
31.7 C (89.1 F)
1956
30.6 C (87.1 F)
1957
31.7 C (89.1 F)
1958
31.1 C (88.0 F)
1959
31.1 C (88.0 F)
1960
33.9 C (93.0 F)
1961
35.0 C (95.0 F)
1962
28.3 C (82.9 F)
1963
30.6 C (87.1 F)
1964
30.6 C (87.1 F)
1965
30.0 C (86.0 F)
1966
31.7 C (89.1 F)
1967
31.1 C (88.0 F)
1968
29.4 C (84.9 F)
1969
32.8 C (91.0 F)
1970
30.6 C (87.1 F)
1971
31.7 C (89.1 F)
1972
29.4 C (84.9 F)
1973
31.1 C (88.0 F)
1974
31.7 C (89.1 F)
1975
30.6 C (87.1 F)
1976
30.6 C (87.1 F)
1977
28.9 C (84.0 F)
1978
28.9 C (84.0 F)
1979
28.9 C (84.0 F)
1980
29.4 C (84.9 F)
1981
29.4 C (84.9 F)
1982
29.4 C (84.9 F)
1983
32.8 C (91.0 F)
1984
30.0 C (86.0 F)
1985
31.7 C (89.1 F)
1986
29.4 C (84.9 F)
1987
30.6 C (87.1 F)
1988
32.2 C (90.0 F)
1989
32.8 C (91.0 F)
1990
32.2 C (90.0 F)
1991
33.3 C (91.9 F)
1992
29.4 C (84.9 F)
1993
29.4 C (84.9 F)
1994
31.1 C (88.0 F)
1995
30.0 C (86.0 F)
Coldest night (TNn)
The coldest night of the year at Bozeman 12 NE, 1950 to 1995. The record is -43.9 C (-47.0 F) in 1983, marked on the chart; the median year is -35.6 C (-32.1 F).
Coldest night (TNn) at Bozeman 12 NE by year
Year
Coldest night (TNn)
1950
-23.9 C (-11.0 F)
1951
-38.3 C (-36.9 F)
1952
-29.4 C (-20.9 F)
1953
-23.3 C (-9.9 F)
1954
-33.3 C (-27.9 F)
1955
-35.6 C (-32.1 F)
1956
-35.6 C (-32.1 F)
1957
-36.1 C (-33.0 F)
1958
-23.3 C (-9.9 F)
1959
-36.7 C (-34.1 F)
1960
-32.8 C (-27.0 F)
1961
-34.4 C (-29.9 F)
1962
-41.7 C (-43.1 F)
1963
-42.8 C (-45.0 F)
1964
-41.7 C (-43.1 F)
1965
-36.7 C (-34.1 F)
1966
-35.0 C (-31.0 F)
1967
-33.3 C (-27.9 F)
1968
-36.7 C (-34.1 F)
1969
-34.4 C (-29.9 F)
1970
-35.6 C (-32.1 F)
1971
-33.3 C (-27.9 F)
1972
-38.9 C (-38.0 F)
1973
-37.2 C (-35.0 F)
1974
-36.1 C (-33.0 F)
1975
-34.4 C (-29.9 F)
1976
-34.4 C (-29.9 F)
1977
-32.2 C (-26.0 F)
1978
-42.8 C (-45.0 F)
1979
-42.2 C (-44.0 F)
1980
-38.9 C (-38.0 F)
1981
-41.7 C (-43.1 F)
1982
-41.1 C (-42.0 F)
1983
-43.9 C (-47.0 F)
1984
-35.0 C (-31.0 F)
1985
-40.0 C (-40.0 F)
1986
-33.3 C (-27.9 F)
1987
-33.3 C (-27.9 F)
1988
-30.6 C (-23.1 F)
1989
-41.7 C (-43.1 F)
1990
-37.2 C (-35.0 F)
1991
-28.9 C (-20.0 F)
1992
-30.6 C (-23.1 F)
1993
-37.2 C (-35.0 F)
1994
-38.3 C (-36.9 F)
1995
-30.0 C (-22.0 F)
Wettest day (Rx1day)
The wettest day of the year at Bozeman 12 NE, 1950 to 1995. The record is 93.2 mm (3.7 in) in 1953, marked on the chart; the median year is 40.8 mm (1.6 in).
Wettest day (Rx1day) at Bozeman 12 NE by year
Year
Wettest day (Rx1day)
1950
50.8 mm (2.0 in)
1951
23.9 mm (0.9 in)
1952
30.7 mm (1.2 in)
1953
93.2 mm (3.7 in)
1954
38.9 mm (1.5 in)
1955
54.4 mm (2.1 in)
1956
25.7 mm (1.0 in)
1957
28.7 mm (1.1 in)
1958
31.2 mm (1.2 in)
1959
42.7 mm (1.7 in)
1960
37.1 mm (1.5 in)
1961
40.9 mm (1.6 in)
1962
31.8 mm (1.3 in)
1963
35.6 mm (1.4 in)
1964
40.6 mm (1.6 in)
1965
55.9 mm (2.2 in)
1966
28.7 mm (1.1 in)
1967
70.1 mm (2.8 in)
1968
84.6 mm (3.3 in)
1969
40.9 mm (1.6 in)
1970
58.4 mm (2.3 in)
1971
39.9 mm (1.6 in)
1972
45.2 mm (1.8 in)
1973
41.7 mm (1.6 in)
1974
33.5 mm (1.3 in)
1975
43.9 mm (1.7 in)
1976
35.1 mm (1.4 in)
1977
33.0 mm (1.3 in)
1978
42.7 mm (1.7 in)
1979
32.5 mm (1.3 in)
1980
49.0 mm (1.9 in)
1981
54.9 mm (2.2 in)
1982
31.5 mm (1.2 in)
1983
57.9 mm (2.3 in)
1984
49.5 mm (1.9 in)
1985
50.3 mm (2.0 in)
1986
52.3 mm (2.1 in)
1987
33.0 mm (1.3 in)
1988
25.9 mm (1.0 in)
1989
31.2 mm (1.2 in)
1990
38.1 mm (1.5 in)
1991
27.2 mm (1.1 in)
1992
59.7 mm (2.4 in)
1993
48.0 mm (1.9 in)
1994
42.4 mm (1.7 in)
1995
40.6 mm (1.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Bozeman 12 NE, 1950 to 1995. The record is 157.2 mm (6.2 in) in 1953, marked on the chart; the median year is 73.6 mm (2.9 in).
Wettest five days (Rx5day) at Bozeman 12 NE by year
Year
Wettest five days (Rx5day)
1950
75.2 mm (3.0 in)
1951
36.1 mm (1.4 in)
1952
78.2 mm (3.1 in)
1953
157.2 mm (6.2 in)
1954
61.8 mm (2.4 in)
1955
72.2 mm (2.8 in)
1956
36.9 mm (1.5 in)
1957
55.6 mm (2.2 in)
1958
76.1 mm (3.0 in)
1959
79.5 mm (3.1 in)
1960
82.0 mm (3.2 in)
1961
75.2 mm (3.0 in)
1962
86.6 mm (3.4 in)
1963
66.3 mm (2.6 in)
1964
82.8 mm (3.3 in)
1965
109.0 mm (4.3 in)
1966
55.6 mm (2.2 in)
1967
80.5 mm (3.2 in)
1968
153.9 mm (6.1 in)
1969
83.9 mm (3.3 in)
1970
102.1 mm (4.0 in)
1971
65.8 mm (2.6 in)
1972
60.4 mm (2.4 in)
1973
70.1 mm (2.8 in)
1974
58.2 mm (2.3 in)
1975
69.6 mm (2.7 in)
1976
77.7 mm (3.1 in)
1977
62.1 mm (2.4 in)
1978
68.7 mm (2.7 in)
1979
75.0 mm (3.0 in)
1980
77.7 mm (3.1 in)
1981
103.6 mm (4.1 in)
1982
70.1 mm (2.8 in)
1983
89.7 mm (3.5 in)
1984
63.8 mm (2.5 in)
1985
64.0 mm (2.5 in)
1986
69.8 mm (2.7 in)
1987
81.9 mm (3.2 in)
1988
45.2 mm (1.8 in)
1989
55.9 mm (2.2 in)
1990
69.3 mm (2.7 in)
1991
53.8 mm (2.1 in)
1992
100.5 mm (4.0 in)
1993
79.1 mm (3.1 in)
1994
68.8 mm (2.7 in)
1995
89.4 mm (3.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Bozeman 12 NE, 1950 to 1995. The record is 38 days in 1955, marked on the chart; the median year is 19 days.
Longest dry spell (CDD) at Bozeman 12 NE by year
Year
Longest dry spell (CDD)
1950
15 days
1951
19 days
1952
29 days
1953
20 days
1954
22 days
1955
38 days
1956
20 days
1957
12 days
1958
14 days
1959
14 days
1960
21 days
1961
15 days
1962
17 days
1963
16 days
1964
28 days
1965
21 days
1966
22 days
1967
20 days
1968
12 days
1969
21 days
1970
11 days
1971
27 days
1972
22 days
1973
12 days
1974
15 days
1975
15 days
1976
30 days
1977
24 days
1978
18 days
1979
25 days
1980
18 days
1981
23 days
1982
13 days
1983
15 days
1984
14 days
1985
15 days
1986
21 days
1987
27 days
1988
30 days
1989
14 days
1990
28 days
1991
19 days
1992
20 days
1993
16 days
1994
18 days
1995
13 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
44 years with a frost
Across 44 years with a frost, the median last spring frost at Bozeman 12 NE falls on 26 June and the median first autumn frost on 7 July, which leaves a median of 17 days between them.
Fitted over all years, the growing season changes by +0.2 days per decade at this station.
Frost dates and growing season at Bozeman 12 NE
Measure
Median, all years
Earliest period
Recent period (1966 to 1995)
Recent against earliest
Fitted trend
Last spring frost
26 June
n/a
26 June
n/a
+0.6 days per decade
First autumn frost
7 July
n/a
7 July
n/a
+0.8 days per decade
Growing days
17 days
n/a
14 days
n/a
+0.2 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
44 years, 1951 to 1995
A day with at least 40.0 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 96.2 mm (3.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Bozeman 12 NE: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
40.0 mm (1.6 in)
5 years
52.5 mm (2.1 in)
10 years
61.7 mm (2.4 in)
25 years
74.5 mm (2.9 in)
50 years
85.0 mm (3.3 in)
Longer than the 44 years of record
100 years
96.2 mm (3.8 in)
Longer than the 44 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, 44 years of values from 1951 to 1995.
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: 93.2 mm (3.7 in) in 1953; 84.6 mm (3.3 in) in 1968; 70.1 mm (2.8 in) in 1967.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Bozeman 12 NE, at 1960. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1960 ran 0.3 C (0.6 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Bozeman 12 NE, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1960
-0.3
-0.6
possible
5
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Data for Bozeman 12 NE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Bozeman 12 NE 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.