Record envelope, standing records and threshold days for St Mary (USC00247292), Montana, United States, with 43 years of record.
Key Facts for St Mary
St Mary (USC00247292) is a weather station in Montana, United States at 48.74 latitude and -113.43 longitude, 1,390 m (4,560 ft) above sea level.
The station reports from 1981 to 2023, 43 years of record.
1,464 records set at St Mary still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
St Mary set a monthly record daily precipitation of 68.2 mm (2.7 in) on 29 June 2026.
About the Station
Location: Montana, United States, 48.74 latitude, -113.43 longitude.
Elevation: 1,390 m (4,560 ft).
Period of record: 1981 to 2023, 43 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 St Mary. 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 St Mary, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
15.6 C (60.1 F)
-37.8 C (-36.0 F)
n/a
n/a
Feb
17.2 C (63.0 F)
-40.0 C (-40.0 F)
n/a
n/a
Mar
22.2 C (72.0 F)
-33.9 C (-29.0 F)
n/a
n/a
Apr
27.8 C (82.0 F)
-23.9 C (-11.0 F)
n/a
n/a
May
33.9 C (93.0 F)
-9.4 C (15.1 F)
n/a
n/a
Jun
35.0 C (95.0 F)
-2.8 C (27.0 F)
n/a
n/a
Jul
38.9 C (102.0 F)
-1.7 C (28.9 F)
n/a
n/a
Aug
37.2 C (99.0 F)
-6.7 C (19.9 F)
n/a
n/a
Sep
35.0 C (95.0 F)
-11.1 C (12.0 F)
n/a
n/a
Oct
30.6 C (87.1 F)
-22.2 C (-8.0 F)
n/a
n/a
Nov
22.2 C (72.0 F)
-31.1 C (-24.0 F)
n/a
n/a
Dec
14.4 C (57.9 F)
-40.0 C (-40.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at St Mary still stand. 1985 holds the most, with 64.
Standing records at St Mary by the year they were set
Year set
Standing records
1981
28
1982
49
1983
30
1984
46
1985
64
1986
57
1987
63
1988
47
1989
33
1990
48
1991
42
1992
63
1993
44
1994
41
1995
36
1996
59
1997
41
1998
37
1999
36
2000
29
2001
41
2002
49
2003
14
2004
33
2005
40
2006
11
2007
20
2008
21
2009
42
2010
49
2011
25
2012
35
2013
34
2014
49
2015
29
2016
26
2017
19
2022
19
2023
15
All-Time Record Progression
3 new records
3 all-time records were set at St Mary between 6 February 2017 and 7 February 2017. Each dot is a new record.
When St Mary set new all-time records
Date
Kind
Detail
2017-02-06
Record daily snowfall
Record daily snowfall 81.3 cm (32.0 in)
2017-02-06
Record snow depth
Record snow depth 137.2 cm (54.0 in)
2017-02-07
Record snow depth
Record snow depth 142.2 cm (56.0 in)
Wettest Day of Each Month
Jul: 124.0 mm (4.9 in)
The wettest day on record for each calendar month at St Mary. The most was 124.0 mm (4.9 in) on 22 July 1987.
Record daily precipitation for each month at St Mary
Month
Record daily precipitation (mm)
Date
Jan
48.8 mm (1.9 in)
19 January 1986
Feb
52.1 mm (2.1 in)
6 February 2017
Mar
61.0 mm (2.4 in)
9 March 2003
Apr
44.7 mm (1.8 in)
3 April 2001
May
80.5 mm (3.2 in)
15 May 1981
Jun
68.2 mm (2.7 in)
29 June 2026
Jul
124.0 mm (4.9 in)
22 July 1987
Aug
61.5 mm (2.4 in)
25 August 1989
Sep
64.5 mm (2.5 in)
7 September 1995
Oct
46.2 mm (1.8 in)
27 October 1994
Nov
52.8 mm (2.1 in)
24 November 1990
Dec
33.0 mm (1.3 in)
31 December 2016
Period of Record Coverage
1981 to 2023
Complete yearUnder 90 percent of days
39 years of record at St Mary, 1981 to 2023. 17 years have data for under 90 percent of days and are left out of rankings: 1981, 1991, 1995, 1998, 1999, 2002, 2003, 2005 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 20 complete years at St Mary, 1982 to 2013. Blue stripes are years cooler than the station's own mean of 5.5 C (41.8 F); red stripes are warmer. The coolest year was 2010, at 3.5 C (38.2 F), and the warmest was 1987, at 7.1 C (44.7 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at St Mary as warming stripes, 1982 to 2013
Year
Annual mean temperature
Difference from the station mean
1982
3.6 C
-1.84 C
1983
5.5 C
+0.03 C
1984
5.1 C
-0.34 C
1985
3.7 C
-1.73 C
1986
6.3 C
+0.85 C
1987
7.1 C
+1.59 C
1988
6.6 C
+1.10 C
1989
4.9 C
-0.52 C
1990
5.4 C
-0.05 C
1992
6.6 C
+1.09 C
1994
6.1 C
+0.68 C
1996
4.0 C
-1.44 C
1997
5.9 C
+0.48 C
1999
6.7 C
+1.22 C
2000
6.2 C
+0.75 C
2001
7.0 C
+1.53 C
2004
6.3 C
+0.80 C
2010
3.5 C
-2.01 C
2012
4.4 C
-1.05 C
2013
4.3 C
-1.14 C
This station does not have enough complete years (30 are needed) to fit a temperature trend.
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
1981 to 2026
Yearly extremes at St Mary: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
38.9 C (102.0 F)
2002
33.9 C (93.0 F)
39
Coldest night (TNn)
-40.0 C (-40.0 F)
1989
-32.8 C (-27.0 F)
39
Wettest day (Rx1day)
124.0 mm (4.9 in)
1987
48.2 mm (1.9 in)
40
Wettest five days (Rx5day)
165.4 mm (6.5 in)
2002
63.8 mm (2.5 in)
39
Longest dry spell (CDD)
43 days
2010
18 days
40
Hottest day (TXx)
The hottest day of the year at St Mary, 1981 to 2026. The record is 38.9 C (102.0 F) in 2002, marked on the chart; the median year is 33.9 C (93.0 F).
Hottest day (TXx) at St Mary by year
Year
Hottest day (TXx)
1981
34.4 C (93.9 F)
1982
31.7 C (89.1 F)
1983
34.4 C (93.9 F)
1984
35.0 C (95.0 F)
1985
33.3 C (91.9 F)
1986
33.3 C (91.9 F)
1987
35.0 C (95.0 F)
1988
35.0 C (95.0 F)
1989
32.2 C (90.0 F)
1990
34.4 C (93.9 F)
1991
33.9 C (93.0 F)
1992
34.4 C (93.9 F)
1993
31.7 C (89.1 F)
1994
36.7 C (98.1 F)
1995
31.7 C (89.1 F)
1996
35.0 C (95.0 F)
1997
36.1 C (97.0 F)
1998
35.0 C (95.0 F)
1999
33.9 C (93.0 F)
2000
37.2 C (99.0 F)
2001
35.6 C (96.1 F)
2002
38.9 C (102.0 F)
2003
23.3 C (73.9 F)
2004
35.6 C (96.1 F)
2005
33.9 C (93.0 F)
2006
37.2 C (99.0 F)
2007
38.9 C (102.0 F)
2008
33.9 C (93.0 F)
2009
32.2 C (90.0 F)
2010
28.9 C (84.0 F)
2011
32.2 C (90.0 F)
2012
31.7 C (89.1 F)
2013
33.3 C (91.9 F)
2014
30.6 C (87.1 F)
2015
32.8 C (91.0 F)
2016
30.0 C (86.0 F)
2017
31.7 C (89.1 F)
2019
n/a
2021
n/a
2022
28.3 C (82.9 F)
2023
26.7 C (80.1 F)
2026
n/a
Coldest night (TNn)
The coldest night of the year at St Mary, 1981 to 2026. The record is -40.0 C (-40.0 F) in 1989, marked on the chart; the median year is -32.8 C (-27.0 F).
Coldest night (TNn) at St Mary by year
Year
Coldest night (TNn)
1981
-28.9 C (-20.0 F)
1982
-35.0 C (-31.0 F)
1983
-38.9 C (-38.0 F)
1984
-31.1 C (-24.0 F)
1985
-33.3 C (-27.9 F)
1986
-30.0 C (-22.0 F)
1987
-25.0 C (-13.0 F)
1988
-30.6 C (-23.1 F)
1989
-40.0 C (-40.0 F)
1990
-38.9 C (-38.0 F)
1991
-32.2 C (-26.0 F)
1992
-34.4 C (-29.9 F)
1993
-30.6 C (-23.1 F)
1994
-34.4 C (-29.9 F)
1995
-31.7 C (-25.1 F)
1996
-35.0 C (-31.0 F)
1997
-32.2 C (-26.0 F)
1998
-37.8 C (-36.0 F)
1999
-26.1 C (-15.0 F)
2000
-27.8 C (-18.0 F)
2001
-25.6 C (-14.1 F)
2002
-33.9 C (-29.0 F)
2003
-29.4 C (-20.9 F)
2004
-33.3 C (-27.9 F)
2005
-35.6 C (-32.1 F)
2006
-31.7 C (-25.1 F)
2007
-26.7 C (-16.1 F)
2008
-32.8 C (-27.0 F)
2009
-33.3 C (-27.9 F)
2010
-28.9 C (-20.0 F)
2011
-33.3 C (-27.9 F)
2012
-32.2 C (-26.0 F)
2013
-35.0 C (-31.0 F)
2014
-33.9 C (-29.0 F)
2015
-24.4 C (-11.9 F)
2016
-30.0 C (-22.0 F)
2017
-32.8 C (-27.0 F)
2019
n/a
2021
n/a
2022
-40.0 C (-40.0 F)
2023
-35.6 C (-32.1 F)
2026
n/a
Wettest day (Rx1day)
The wettest day of the year at St Mary, 1981 to 2026. The record is 124.0 mm (4.9 in) in 1987, marked on the chart; the median year is 48.2 mm (1.9 in).
Wettest day (Rx1day) at St Mary by year
Year
Wettest day (Rx1day)
1981
80.5 mm (3.2 in)
1982
25.9 mm (1.0 in)
1983
23.9 mm (0.9 in)
1984
38.4 mm (1.5 in)
1985
61.7 mm (2.4 in)
1986
48.8 mm (1.9 in)
1987
124.0 mm (4.9 in)
1988
25.9 mm (1.0 in)
1989
61.5 mm (2.4 in)
1990
52.8 mm (2.1 in)
1991
37.1 mm (1.5 in)
1992
32.5 mm (1.3 in)
1993
54.9 mm (2.2 in)
1994
46.2 mm (1.8 in)
1995
64.5 mm (2.5 in)
1996
62.0 mm (2.4 in)
1997
47.8 mm (1.9 in)
1998
50.8 mm (2.0 in)
1999
48.8 mm (1.9 in)
2000
34.3 mm (1.4 in)
2001
44.7 mm (1.8 in)
2002
61.0 mm (2.4 in)
2003
61.0 mm (2.4 in)
2004
20.3 mm (0.8 in)
2005
50.5 mm (2.0 in)
2006
50.5 mm (2.0 in)
2007
25.9 mm (1.0 in)
2008
50.8 mm (2.0 in)
2009
48.5 mm (1.9 in)
2010
43.7 mm (1.7 in)
2011
22.9 mm (0.9 in)
2012
30.5 mm (1.2 in)
2013
47.8 mm (1.9 in)
2014
65.3 mm (2.6 in)
2015
43.2 mm (1.7 in)
2016
36.8 mm (1.4 in)
2017
52.1 mm (2.1 in)
2019
n/a
2021
9.7 mm (0.38 in)
2022
n/a
2023
7.1 mm (0.28 in)
2026
68.2 mm (2.7 in)
Wettest five days (Rx5day)
The wettest five days of the year at St Mary, 1981 to 2026. The record is 165.4 mm (6.5 in) in 2002, marked on the chart; the median year is 63.8 mm (2.5 in).
Wettest five days (Rx5day) at St Mary by year
Year
Wettest five days (Rx5day)
1981
90.9 mm (3.6 in)
1982
52.3 mm (2.1 in)
1983
41.9 mm (1.6 in)
1984
59.7 mm (2.4 in)
1985
78.0 mm (3.1 in)
1986
127.3 mm (5.0 in)
1987
162.1 mm (6.4 in)
1988
63.8 mm (2.5 in)
1989
109.5 mm (4.3 in)
1990
118.4 mm (4.7 in)
1991
47.8 mm (1.9 in)
1992
55.9 mm (2.2 in)
1993
81.2 mm (3.2 in)
1994
54.6 mm (2.1 in)
1995
115.3 mm (4.5 in)
1996
73.4 mm (2.9 in)
1997
74.2 mm (2.9 in)
1998
61.2 mm (2.4 in)
1999
49.6 mm (2.0 in)
2000
42.2 mm (1.7 in)
2001
58.4 mm (2.3 in)
2002
165.4 mm (6.5 in)
2003
49.4 mm (1.9 in)
2004
55.2 mm (2.2 in)
2005
113.1 mm (4.5 in)
2006
89.6 mm (3.5 in)
2007
36.9 mm (1.5 in)
2008
91.3 mm (3.6 in)
2009
57.6 mm (2.3 in)
2010
98.3 mm (3.9 in)
2011
35.7 mm (1.4 in)
2012
65.3 mm (2.6 in)
2013
57.5 mm (2.3 in)
2014
82.2 mm (3.2 in)
2015
36.1 mm (1.4 in)
2016
21.1 mm (0.8 in)
2017
130.7 mm (5.1 in)
2019
n/a
2021
11.8 mm (0.5 in)
2022
n/a
2023
n/a
2026
124.4 mm (4.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at St Mary, 1981 to 2026. The record is 43 days in 2010, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at St Mary by year
Year
Longest dry spell (CDD)
1981
22 days
1982
21 days
1983
17 days
1984
35 days
1985
32 days
1986
18 days
1987
31 days
1988
26 days
1989
13 days
1990
13 days
1991
21 days
1992
20 days
1993
13 days
1994
28 days
1995
17 days
1996
14 days
1997
17 days
1998
27 days
1999
17 days
2000
40 days
2001
35 days
2002
18 days
2003
15 days
2004
18 days
2005
30 days
2006
15 days
2007
18 days
2008
16 days
2009
27 days
2010
43 days
2011
16 days
2012
17 days
2013
25 days
2014
22 days
2015
26 days
2016
15 days
2017
37 days
2019
n/a
2021
12 days
2022
n/a
2023
2 days
2026
17 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
20 years with a frost
Across 20 years with a frost, the median last spring frost at St Mary falls on 3 June and the median first autumn frost on 11 September, which leaves a median of 94 days between them.
Frost dates and growing season at St Mary
Measure
Median, all years
Earliest period
Recent period (1982 to 2013)
Recent against earliest
Fitted trend
Last spring frost
3 June
n/a
3 June
n/a
n/a
First autumn frost
11 September
n/a
11 September
n/a
n/a
Growing days
94 days
n/a
94 days
n/a
n/a
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 St Mary standing records by year: CSV or JSON. Field meanings are on the data page.
Data for St Mary 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.