Record envelope, standing records and threshold days for Millegan 14 SE (USC00245712), Montana, United States, with 43 years of record.
Key Facts for Millegan 14 SE
Millegan 14 SE (USC00245712) is a weather station in Montana, United States at 46.88 latitude and -111.16 longitude, 1,515 m (4,970 ft) above sea level.
The station reports from 1984 to 2026, 43 years of record.
1,464 records set at Millegan 14 SE still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Millegan 14 SE set a daily record precipitation of 25.4 mm (1.0 in) on 29 June 2026.
About the Station
Location: Montana, United States, 46.88 latitude, -111.16 longitude.
Elevation: 1,515 m (4,970 ft).
Period of record: 1984 to 2026, 43 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
21 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 Millegan 14 SE. The lines show the 2026 daily maximum and minimum. 21 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Millegan 14 SE, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
15.0 C (59.0 F)
-38.3 C (-36.9 F)
13.9 C (57.0 F)
-23.9 C (-11.0 F)
Feb
19.4 C (66.9 F)
-42.2 C (-44.0 F)
16.7 C (62.1 F)
-24.4 C (-11.9 F)
Mar
22.8 C (73.0 F)
-37.8 C (-36.0 F)
22.8 C (73.0 F)
-20.0 C (-4.0 F)
Apr
26.7 C (80.1 F)
-21.7 C (-7.1 F)
25.0 C (77.0 F)
-10.0 C (14.0 F)
May
30.0 C (86.0 F)
-13.3 C (8.1 F)
28.3 C (82.9 F)
-8.9 C (16.0 F)
Jun
35.6 C (96.1 F)
-3.9 C (25.0 F)
27.2 C (81.0 F)
-2.2 C (28.0 F)
Jul
36.7 C (98.1 F)
-1.1 C (30.0 F)
n/a
n/a
Aug
36.1 C (97.0 F)
-5.6 C (21.9 F)
n/a
n/a
Sep
36.1 C (97.0 F)
-12.2 C (10.0 F)
n/a
n/a
Oct
30.0 C (86.0 F)
-28.3 C (-18.9 F)
n/a
n/a
Nov
21.1 C (70.0 F)
-31.1 C (-24.0 F)
n/a
n/a
Dec
16.1 C (61.0 F)
-41.1 C (-42.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Millegan 14 SE still stand. 1985 holds the most, with 60.
Standing records at Millegan 14 SE by the year they were set
Year set
Standing records
1984
22
1985
60
1986
41
1987
49
1988
35
1989
32
1990
37
1991
32
1992
51
1993
33
1994
39
1995
34
1996
51
1997
34
1998
20
1999
31
2000
32
2001
27
2002
37
2003
51
2004
31
2005
43
2006
29
2007
23
2008
42
2009
47
2010
20
2011
24
2012
36
2013
36
2014
44
2015
26
2016
20
2017
41
2018
7
2019
35
2020
41
2021
48
2022
47
2023
12
2024
13
2025
19
2026
32
All-Time Record Progression
2 new records
2 all-time records were set at Millegan 14 SE between 28 July 2017 and 11 October 2022. Each dot is a new record.
When Millegan 14 SE set new all-time records
Date
Kind
Detail
2017-07-28
Record high maximum temperature
Record high maximum temperature 36.7 C (98.1 F)
2022-10-11
Record daily precipitation
Record daily precipitation 76.2 mm (3.0 in)
Wettest Day of Each Month
Oct: 76.2 mm (3.0 in)
The wettest day on record for each calendar month at Millegan 14 SE. The most was 76.2 mm (3.0 in) on 11 October 2022.
Record daily precipitation for each month at Millegan 14 SE
Month
Record daily precipitation (mm)
Date
Jan
50.8 mm (2.0 in)
6 January 2022
Feb
25.4 mm (1.0 in)
4 February 2021
Mar
50.8 mm (2.0 in)
10 March 2023
Apr
57.2 mm (2.3 in)
19 April 2023
May
41.7 mm (1.6 in)
7 May 1988
Jun
61.0 mm (2.4 in)
7 June 1997
Jul
39.9 mm (1.6 in)
3 July 1993
Aug
37.8 mm (1.5 in)
22 August 1993
Sep
60.5 mm (2.4 in)
18 September 2024
Oct
76.2 mm (3.0 in)
11 October 2022
Nov
33.8 mm (1.3 in)
27 November 2005
Dec
51.8 mm (2.0 in)
27 December 2003
Period of Record Coverage
1984 to 2026
Complete yearUnder 90 percent of days
43 years of record at Millegan 14 SE, 1984 to 2026. 8 years have data for under 90 percent of days and are left out of rankings: 1984, 1989, 1995, 2018, 2023, 2024, 2025, 2026.
Cooler than the station meanWarmer than the station mean
One stripe for each of 32 complete years at Millegan 14 SE, 1985 to 2022. Blue stripes are years cooler than the station's own mean of 5.0 C (41.0 F); red stripes are warmer. The coolest year was 2019, at 2.8 C (37.1 F), and the warmest was 1987, at 6.2 C (43.2 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Millegan 14 SE as warming stripes, 1985 to 2022
Year
Annual mean temperature
Difference from the station mean
1985
3.6 C
-1.43 C
1986
5.6 C
+0.62 C
1987
6.2 C
+1.22 C
1988
5.7 C
+0.73 C
1990
5.4 C
+0.43 C
1991
5.6 C
+0.57 C
1992
5.7 C
+0.73 C
1993
3.6 C
-1.40 C
1994
5.7 C
+0.71 C
1996
3.8 C
-1.23 C
1997
4.8 C
-0.19 C
1998
5.6 C
+0.60 C
1999
6.0 C
+0.99 C
2000
5.0 C
+0.05 C
2001
5.4 C
+0.43 C
2002
4.3 C
-0.72 C
2003
5.8 C
+0.84 C
2004
5.2 C
+0.22 C
2005
5.0 C
+0.01 C
2006
6.0 C
+0.96 C
2007
5.7 C
+0.73 C
2008
4.2 C
-0.82 C
2009
4.0 C
-0.95 C
2010
4.4 C
-0.63 C
2011
4.4 C
-0.55 C
2014
5.4 C
+0.41 C
2016
5.6 C
+0.65 C
2017
5.1 C
+0.09 C
2019
2.8 C
-2.15 C
2020
4.9 C
-0.10 C
2021
5.1 C
+0.09 C
2022
3.9 C
-1.06 C
The fitted trend in annual mean temperature here over 1985 to 2022 is -0.2 C (-0.5 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.4 F (-0.9 to 0.1) per decade. The slope is a straight line fitted to 32 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Millegan 14 SE
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.2 C (-0.5 to 0.1) per decade
-0.4 F (-0.9 to 0.1) per decade
1985 to 2022
32
Not clearly different from zero
Mean daily maximum
-0.2 C (-0.6 to 0.1) per decade
-0.4 F (-1.0 to 0.1) per decade
1985 to 2022
32
Not clearly different from zero
Mean daily minimum
-0.2 C (-0.4 to 0.1) per decade
-0.3 F (-0.8 to 0.2) per decade
1985 to 2022
32
Not clearly different from zero
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
1984 to 2026
Yearly extremes at Millegan 14 SE: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.7 C (98.1 F)
2017
33.9 C (93.0 F)
43
Coldest night (TNn)
-42.2 C (-44.0 F)
1989
-31.7 C (-25.1 F)
43
Wettest day (Rx1day)
76.2 mm (3.0 in)
2022
31.2 mm (1.2 in)
43
Wettest five days (Rx5day)
125.1 mm (4.9 in)
1997
56.4 mm (2.2 in)
43
Longest dry spell (CDD)
95 days
2021
25 days
43
Hottest day (TXx)
The hottest day of the year at Millegan 14 SE, 1984 to 2026. The record is 36.7 C (98.1 F) in 2017, marked on the chart; the median year is 33.9 C (93.0 F).
Hottest day (TXx) at Millegan 14 SE by year
Year
Hottest day (TXx)
1984
33.9 C (93.0 F)
1985
35.6 C (96.1 F)
1986
32.8 C (91.0 F)
1987
33.3 C (91.9 F)
1988
33.9 C (93.0 F)
1989
30.6 C (87.1 F)
1990
35.0 C (95.0 F)
1991
33.9 C (93.0 F)
1992
31.7 C (89.1 F)
1993
31.7 C (89.1 F)
1994
32.8 C (91.0 F)
1995
31.7 C (89.1 F)
1996
35.0 C (95.0 F)
1997
31.1 C (88.0 F)
1998
33.3 C (91.9 F)
1999
33.9 C (93.0 F)
2000
35.0 C (95.0 F)
2001
34.4 C (93.9 F)
2002
36.1 C (97.0 F)
2003
35.6 C (96.1 F)
2004
33.9 C (93.0 F)
2005
32.2 C (90.0 F)
2006
35.0 C (95.0 F)
2007
35.6 C (96.1 F)
2008
33.3 C (91.9 F)
2009
32.2 C (90.0 F)
2010
31.7 C (89.1 F)
2011
32.8 C (91.0 F)
2012
35.6 C (96.1 F)
2013
35.6 C (96.1 F)
2014
34.4 C (93.9 F)
2015
35.6 C (96.1 F)
2016
35.6 C (96.1 F)
2017
36.7 C (98.1 F)
2018
29.4 C (84.9 F)
2019
32.2 C (90.0 F)
2020
33.9 C (93.0 F)
2021
36.1 C (97.0 F)
2022
36.1 C (97.0 F)
2023
35.0 C (95.0 F)
2024
36.1 C (97.0 F)
2025
34.4 C (93.9 F)
2026
28.3 C (82.9 F)
Coldest night (TNn)
The coldest night of the year at Millegan 14 SE, 1984 to 2026. The record is -42.2 C (-44.0 F) in 1989, marked on the chart; the median year is -31.7 C (-25.1 F).
Coldest night (TNn) at Millegan 14 SE by year
Year
Coldest night (TNn)
1984
-30.6 C (-23.1 F)
1985
-33.9 C (-29.0 F)
1986
-31.1 C (-24.0 F)
1987
-27.2 C (-17.0 F)
1988
-28.9 C (-20.0 F)
1989
-42.2 C (-44.0 F)
1990
-39.4 C (-38.9 F)
1991
-32.2 C (-26.0 F)
1992
-31.1 C (-24.0 F)
1993
-34.4 C (-29.9 F)
1994
-35.6 C (-32.1 F)
1995
-30.0 C (-22.0 F)
1996
-40.0 C (-40.0 F)
1997
-36.7 C (-34.1 F)
1998
-35.0 C (-31.0 F)
1999
-25.0 C (-13.0 F)
2000
-30.0 C (-22.0 F)
2001
-26.1 C (-15.0 F)
2002
-28.9 C (-20.0 F)
2003
-31.1 C (-24.0 F)
2004
-38.3 C (-36.9 F)
2005
-32.8 C (-27.0 F)
2006
-36.1 C (-33.0 F)
2007
-31.1 C (-24.0 F)
2008
-33.9 C (-29.0 F)
2009
-34.4 C (-29.9 F)
2010
-31.1 C (-24.0 F)
2011
-33.3 C (-27.9 F)
2012
-25.6 C (-14.1 F)
2013
-33.9 C (-29.0 F)
2014
-38.9 C (-38.0 F)
2015
-25.6 C (-14.1 F)
2016
-35.6 C (-32.1 F)
2017
-28.3 C (-18.9 F)
2018
-23.3 C (-9.9 F)
2019
-37.8 C (-36.0 F)
2020
-25.6 C (-14.1 F)
2021
-36.7 C (-34.1 F)
2022
-41.1 C (-42.0 F)
2023
-31.7 C (-25.1 F)
2024
-7.2 C (19.0 F)
2025
-22.8 C (-9.0 F)
2026
-24.4 C (-11.9 F)
Wettest day (Rx1day)
The wettest day of the year at Millegan 14 SE, 1984 to 2026. The record is 76.2 mm (3.0 in) in 2022, marked on the chart; the median year is 31.2 mm (1.2 in).
Wettest day (Rx1day) at Millegan 14 SE by year
Year
Wettest day (Rx1day)
1984
23.6 mm (0.9 in)
1985
22.6 mm (0.9 in)
1986
29.7 mm (1.2 in)
1987
22.9 mm (0.9 in)
1988
41.7 mm (1.6 in)
1989
28.7 mm (1.1 in)
1990
22.1 mm (0.9 in)
1991
34.3 mm (1.4 in)
1992
42.2 mm (1.7 in)
1993
39.9 mm (1.6 in)
1994
17.3 mm (0.7 in)
1995
46.0 mm (1.8 in)
1996
21.1 mm (0.8 in)
1997
61.0 mm (2.4 in)
1998
31.5 mm (1.2 in)
1999
25.9 mm (1.0 in)
2000
25.9 mm (1.0 in)
2001
23.6 mm (0.9 in)
2002
52.1 mm (2.1 in)
2003
51.8 mm (2.0 in)
2004
33.8 mm (1.3 in)
2005
46.5 mm (1.8 in)
2006
33.3 mm (1.3 in)
2007
26.7 mm (1.1 in)
2008
45.0 mm (1.8 in)
2009
24.4 mm (1.0 in)
2010
27.7 mm (1.1 in)
2011
27.2 mm (1.1 in)
2012
30.2 mm (1.2 in)
2013
31.2 mm (1.2 in)
2014
26.9 mm (1.1 in)
2015
32.5 mm (1.3 in)
2016
32.3 mm (1.3 in)
2017
38.1 mm (1.5 in)
2018
12.7 mm (0.5 in)
2019
25.4 mm (1.0 in)
2020
38.1 mm (1.5 in)
2021
31.8 mm (1.3 in)
2022
76.2 mm (3.0 in)
2023
57.2 mm (2.3 in)
2024
60.5 mm (2.4 in)
2025
25.4 mm (1.0 in)
2026
25.4 mm (1.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Millegan 14 SE, 1984 to 2026. The record is 125.1 mm (4.9 in) in 1997, marked on the chart; the median year is 56.4 mm (2.2 in).
Wettest five days (Rx5day) at Millegan 14 SE by year
Year
Wettest five days (Rx5day)
1984
32.2 mm (1.3 in)
1985
40.4 mm (1.6 in)
1986
60.5 mm (2.4 in)
1987
33.6 mm (1.3 in)
1988
44.2 mm (1.7 in)
1989
48.8 mm (1.9 in)
1990
41.1 mm (1.6 in)
1991
67.3 mm (2.6 in)
1992
71.2 mm (2.8 in)
1993
73.5 mm (2.9 in)
1994
47.5 mm (1.9 in)
1995
70.0 mm (2.8 in)
1996
34.0 mm (1.3 in)
1997
125.1 mm (4.9 in)
1998
59.9 mm (2.4 in)
1999
31.5 mm (1.2 in)
2000
64.7 mm (2.5 in)
2001
46.8 mm (1.8 in)
2002
78.0 mm (3.1 in)
2003
63.7 mm (2.5 in)
2004
61.1 mm (2.4 in)
2005
101.1 mm (4.0 in)
2006
60.0 mm (2.4 in)
2007
61.9 mm (2.4 in)
2008
91.6 mm (3.6 in)
2009
50.1 mm (2.0 in)
2010
69.0 mm (2.7 in)
2011
44.9 mm (1.8 in)
2012
50.3 mm (2.0 in)
2013
83.0 mm (3.3 in)
2014
72.9 mm (2.9 in)
2015
41.3 mm (1.6 in)
2016
56.4 mm (2.2 in)
2017
41.9 mm (1.6 in)
2018
17.8 mm (0.7 in)
2019
36.8 mm (1.4 in)
2020
50.8 mm (2.0 in)
2021
50.9 mm (2.0 in)
2022
76.2 mm (3.0 in)
2023
82.6 mm (3.3 in)
2024
73.7 mm (2.9 in)
2025
32.0 mm (1.3 in)
2026
38.6 mm (1.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Millegan 14 SE, 1984 to 2026. The record is 95 days in 2021, marked on the chart; the median year is 25 days.
Longest dry spell (CDD) at Millegan 14 SE by year
Year
Longest dry spell (CDD)
1984
21 days
1985
27 days
1986
25 days
1987
49 days
1988
32 days
1989
17 days
1990
27 days
1991
29 days
1992
23 days
1993
15 days
1994
30 days
1995
21 days
1996
21 days
1997
19 days
1998
23 days
1999
32 days
2000
14 days
2001
25 days
2002
27 days
2003
35 days
2004
24 days
2005
34 days
2006
26 days
2007
27 days
2008
18 days
2009
19 days
2010
20 days
2011
20 days
2012
31 days
2013
20 days
2014
17 days
2015
19 days
2016
19 days
2017
20 days
2018
43 days
2019
30 days
2020
88 days
2021
95 days
2022
82 days
2023
23 days
2024
27 days
2025
40 days
2026
26 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
32 years with a frost
Across 32 years with a frost, the median last spring frost at Millegan 14 SE falls on 13 June and the median first autumn frost on 3 September, which leaves a median of 80 days between them.
Fitted over all years, the growing season changes by +3.0 days per decade at this station.
Frost dates and growing season at Millegan 14 SE
Measure
Median, all years
Earliest period
Recent period (1987 to 2022)
Recent against earliest
Fitted trend
Last spring frost
13 June
n/a
13 June
n/a
+0.4 days per decade
First autumn frost
3 September
n/a
3 September
n/a
+3.4 days per decade
Growing days
80 days
n/a
80 days
n/a
+3.0 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
34 years, 1985 to 2022
A day with at least 31.1 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 84.3 mm (3.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Millegan 14 SE: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
31.1 mm (1.2 in)
5 years
41.8 mm (1.6 in)
10 years
50.2 mm (2.0 in)
25 years
62.3 mm (2.5 in)
50 years
72.7 mm (2.9 in)
Longer than the 34 years of record
100 years
84.3 mm (3.3 in)
Longer than the 34 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, 34 years of values from 1985 to 2022.
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: 76.2 mm (3.0 in) in 2022; 61.0 mm (2.4 in) in 1997; 52.1 mm (2.1 in) in 2002.
Download the Data
Data for Millegan 14 SE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Millegan 14 SE 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.