Record envelope, standing records and threshold days for Redstone (USC00246927), Montana, United States, with 61 years of record.
Key Facts for Redstone
Redstone (USC00246927) is a weather station in Montana, United States at 48.82 latitude and -104.94 longitude, 642 m (2,106 ft) above sea level.
The station reports from 1951 to 2011, 61 years of record.
1,464 records set at Redstone still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Redstone set a daily record precipitation of 38.1 mm (1.5 in) on 17 June 2011.
About the Station
Location: Montana, United States, 48.82 latitude, -104.94 longitude.
Elevation: 642 m (2,106 ft).
Period of record: 1951 to 2011, 61 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 Redstone. 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 Redstone, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
16.7 C (62.1 F)
-47.2 C (-53.0 F)
n/a
n/a
Feb
20.0 C (68.0 F)
-44.4 C (-47.9 F)
n/a
n/a
Mar
26.1 C (79.0 F)
-37.2 C (-35.0 F)
n/a
n/a
Apr
33.3 C (91.9 F)
-32.8 C (-27.0 F)
n/a
n/a
May
38.9 C (102.0 F)
-15.0 C (5.0 F)
n/a
n/a
Jun
40.6 C (105.1 F)
-5.0 C (23.0 F)
n/a
n/a
Jul
43.3 C (109.9 F)
-1.7 C (28.9 F)
n/a
n/a
Aug
43.3 C (109.9 F)
-3.3 C (26.1 F)
n/a
n/a
Sep
40.0 C (104.0 F)
-12.8 C (9.0 F)
n/a
n/a
Oct
35.6 C (96.1 F)
-24.4 C (-11.9 F)
n/a
n/a
Nov
26.7 C (80.1 F)
-35.6 C (-32.1 F)
n/a
n/a
Dec
15.6 C (60.1 F)
-46.7 C (-52.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Redstone still stand. 2004 holds the most, with 56.
Standing records at Redstone by the year they were set
Year set
Standing records
1951
12
1952
30
1953
15
1954
39
1955
19
1956
23
1957
29
1958
20
1959
30
1960
13
1961
17
1962
27
1963
23
1964
29
1965
40
1966
34
1967
19
1968
18
1969
36
1970
10
1971
12
1972
32
1973
16
1974
24
1975
17
1976
23
1977
27
1978
22
1979
20
1980
23
1981
19
1982
17
1983
39
1984
28
1985
27
1986
26
1987
35
1988
55
1989
22
1990
21
1991
36
1992
42
1993
18
1994
22
1995
23
1996
29
1997
20
1998
16
1999
20
2000
17
2001
20
2002
30
2003
28
2004
56
2005
11
2006
11
2007
29
2008
12
2009
26
2010
6
2011
4
All-Time Record Progression
5 new records
5 all-time records were set at Redstone between 6 August 1983 and 30 December 2008. Each dot is a new record.
When Redstone set new all-time records
Date
Kind
Detail
1983-08-06
Record high maximum temperature
Record high maximum temperature 43.3 C (109.9 F)
1983-12-23
Record low maximum temperature
Record low maximum temperature -31.7 C (-25.1 F)
1989-08-02
Record high minimum temperature
Record high minimum temperature 23.3 C (73.9 F)
2005-07-09
Record high minimum temperature
Record high minimum temperature 27.8 C (82.0 F)
2008-12-30
Record daily snowfall
Record daily snowfall 19.6 cm (7.7 in)
Wettest Day of Each Month
Sep: 83.1 mm (3.3 in)
The wettest day on record for each calendar month at Redstone. The most was 83.1 mm (3.3 in) on 12 September 1978.
Record daily precipitation for each month at Redstone
Month
Record daily precipitation (mm)
Date
Jan
33.0 mm (1.3 in)
28 January 2008
Feb
34.5 mm (1.4 in)
10 February 2008
Mar
38.1 mm (1.5 in)
8 March 2011
Apr
37.6 mm (1.5 in)
18 April 1992
May
53.8 mm (2.1 in)
30 May 2007
Jun
52.1 mm (2.1 in)
30 June 1953
Jul
58.4 mm (2.3 in)
3 July 2007
Aug
54.6 mm (2.1 in)
25 August 1960
Sep
83.1 mm (3.3 in)
12 September 1978
Oct
26.7 mm (1.1 in)
18 October 1971
Nov
34.0 mm (1.3 in)
26 November 2007
Dec
35.6 mm (1.4 in)
28 December 2005
Period of Record Coverage
1951 to 2011
Complete yearUnder 90 percent of days
61 years of record at Redstone, 1951 to 2011. 10 years have data for under 90 percent of days and are left out of rankings: 1951, 2000, 2001, 2002, 2003, 2004, 2005, 2009 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 47 complete years at Redstone, 1952 to 2009. Blue stripes are years cooler than the station's own mean of 4.6 C (40.3 F); red stripes are warmer. The coolest year was 1982, at 2.5 C (36.4 F), and the warmest was 1987, at 7.5 C (45.5 F). The strongest colour marks a difference of 2.9 C (5.2 F).
Annual mean temperature at Redstone as warming stripes, 1952 to 2009
Year
Annual mean temperature
Difference from the station mean
1952
3.9 C
-0.66 C
1954
4.2 C
-0.42 C
1955
3.0 C
-1.56 C
1956
4.3 C
-0.26 C
1957
4.5 C
-0.14 C
1958
4.9 C
+0.30 C
1959
4.1 C
-0.54 C
1960
4.3 C
-0.28 C
1961
5.1 C
+0.48 C
1962
4.4 C
-0.16 C
1963
5.4 C
+0.84 C
1964
4.3 C
-0.28 C
1965
3.2 C
-1.36 C
1966
3.8 C
-0.83 C
1967
3.8 C
-0.78 C
1968
4.3 C
-0.30 C
1969
3.6 C
-0.95 C
1971
4.4 C
-0.17 C
1972
3.4 C
-1.22 C
1975
3.8 C
-0.75 C
1977
5.1 C
+0.52 C
1978
3.5 C
-1.05 C
1979
3.4 C
-1.18 C
1981
6.5 C
+1.90 C
1982
2.5 C
-2.12 C
1983
4.8 C
+0.17 C
1984
5.1 C
+0.55 C
1985
4.0 C
-0.61 C
1986
6.1 C
+1.55 C
1987
7.5 C
+2.89 C
1988
5.9 C
+1.28 C
1989
4.5 C
-0.08 C
1990
5.7 C
+1.14 C
1991
5.8 C
+1.25 C
1992
5.6 C
+1.02 C
1993
3.8 C
-0.76 C
1994
4.7 C
+0.08 C
1995
4.6 C
-0.04 C
1996
2.7 C
-1.91 C
1997
5.0 C
+0.44 C
1998
6.0 C
+1.40 C
1999
5.6 C
+0.98 C
2001
5.9 C
+1.27 C
2006
6.1 C
+1.49 C
2007
5.5 C
+0.92 C
2008
4.4 C
-0.18 C
2009
2.9 C
-1.72 C
The annual mean temperature here has risen by 0.21 C (0.02 to 0.39) per decade over 1952 to 2009. In Fahrenheit: 0.38 F (0.04 to 0.71) per decade. The slope is a straight line fitted to 47 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Redstone
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.21 C (0.02 to 0.39) per decade
0.38 F (0.04 to 0.71) per decade
1952 to 2009
47
Rise
Mean daily maximum
0.19 C (-0.01 to 0.40) per decade
0.35 F (-0.02 to 0.71) per decade
1952 to 2009
47
Not clearly different from zero
Mean daily minimum
0.23 C (0.05 to 0.41) per decade
0.4 F (0.1 to 0.7) per decade
1952 to 2009
47
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
1951 to 2011
Yearly extremes at Redstone: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
43.3 C (109.9 F)
1983
38.3 C (100.9 F)
61
Coldest night (TNn)
-47.2 C (-53.0 F)
1954
-38.3 C (-36.9 F)
61
Wettest day (Rx1day)
83.1 mm (3.3 in)
1978
33.0 mm (1.3 in)
61
Wettest five days (Rx5day)
104.5 mm (4.1 in)
1959
48.5 mm (1.9 in)
60
Longest dry spell (CDD)
83 days
1991
41 days
61
Hottest day (TXx)
The hottest day of the year at Redstone, 1951 to 2011. The record is 43.3 C (109.9 F) in 1983, marked on the chart; the median year is 38.3 C (100.9 F).
Hottest day (TXx) at Redstone by year
Year
Hottest day (TXx)
1951
40.0 C (104.0 F)
1952
38.9 C (102.0 F)
1953
32.8 C (91.0 F)
1954
34.4 C (93.9 F)
1955
37.8 C (100.0 F)
1956
38.3 C (100.9 F)
1957
38.3 C (100.9 F)
1958
40.6 C (105.1 F)
1959
38.9 C (102.0 F)
1960
40.0 C (104.0 F)
1961
38.3 C (100.9 F)
1962
35.0 C (95.0 F)
1963
38.9 C (102.0 F)
1964
37.8 C (100.0 F)
1965
38.9 C (102.0 F)
1966
39.4 C (102.9 F)
1967
37.2 C (99.0 F)
1968
38.3 C (100.9 F)
1969
38.9 C (102.0 F)
1970
38.3 C (100.9 F)
1971
40.0 C (104.0 F)
1972
37.8 C (100.0 F)
1973
38.3 C (100.9 F)
1974
37.8 C (100.0 F)
1975
40.6 C (105.1 F)
1976
38.9 C (102.0 F)
1977
36.7 C (98.1 F)
1978
40.0 C (104.0 F)
1979
37.2 C (99.0 F)
1980
38.9 C (102.0 F)
1981
37.8 C (100.0 F)
1982
35.6 C (96.1 F)
1983
43.3 C (109.9 F)
1984
39.4 C (102.9 F)
1985
40.6 C (105.1 F)
1986
37.2 C (99.0 F)
1987
37.2 C (99.0 F)
1988
40.6 C (105.1 F)
1989
40.0 C (104.0 F)
1990
38.3 C (100.9 F)
1991
37.8 C (100.0 F)
1992
37.2 C (99.0 F)
1993
35.0 C (95.0 F)
1994
38.3 C (100.9 F)
1995
41.1 C (106.0 F)
1996
36.7 C (98.1 F)
1997
35.6 C (96.1 F)
1998
38.3 C (100.9 F)
1999
37.8 C (100.0 F)
2000
36.1 C (97.0 F)
2001
37.2 C (99.0 F)
2002
39.4 C (102.9 F)
2003
38.9 C (102.0 F)
2004
36.1 C (97.0 F)
2005
36.1 C (97.0 F)
2006
37.2 C (99.0 F)
2007
43.3 C (109.9 F)
2008
37.2 C (99.0 F)
2009
35.6 C (96.1 F)
2010
36.1 C (97.0 F)
2011
29.4 C (84.9 F)
Coldest night (TNn)
The coldest night of the year at Redstone, 1951 to 2011. The record is -47.2 C (-53.0 F) in 1954, marked on the chart; the median year is -38.3 C (-36.9 F).
Coldest night (TNn) at Redstone by year
Year
Coldest night (TNn)
1951
-38.3 C (-36.9 F)
1952
-37.8 C (-36.0 F)
1953
-41.1 C (-42.0 F)
1954
-47.2 C (-53.0 F)
1955
-35.0 C (-31.0 F)
1956
-37.2 C (-35.0 F)
1957
-39.4 C (-38.9 F)
1958
-37.2 C (-35.0 F)
1959
-38.9 C (-38.0 F)
1960
-33.9 C (-29.0 F)
1961
-36.7 C (-34.1 F)
1962
-44.4 C (-47.9 F)
1963
-38.3 C (-36.9 F)
1964
-35.6 C (-32.1 F)
1965
-40.6 C (-41.1 F)
1966
-39.4 C (-38.9 F)
1967
-38.9 C (-38.0 F)
1968
-38.9 C (-38.0 F)
1969
-44.4 C (-47.9 F)
1970
-41.7 C (-43.1 F)
1971
-36.7 C (-34.1 F)
1972
-37.8 C (-36.0 F)
1973
-36.7 C (-34.1 F)
1974
-41.1 C (-42.0 F)
1975
-35.6 C (-32.1 F)
1976
-37.8 C (-36.0 F)
1977
-41.1 C (-42.0 F)
1978
-40.0 C (-40.0 F)
1979
-38.3 C (-36.9 F)
1980
-38.9 C (-38.0 F)
1981
-33.9 C (-29.0 F)
1982
-41.1 C (-42.0 F)
1983
-46.7 C (-52.1 F)
1984
-39.4 C (-38.9 F)
1985
-36.1 C (-33.0 F)
1986
-38.9 C (-38.0 F)
1987
-24.4 C (-11.9 F)
1988
-38.3 C (-36.9 F)
1989
-42.2 C (-44.0 F)
1990
-40.6 C (-41.1 F)
1991
-38.9 C (-38.0 F)
1992
-35.0 C (-31.0 F)
1993
-41.7 C (-43.1 F)
1994
-42.2 C (-44.0 F)
1995
-32.2 C (-26.0 F)
1996
-42.2 C (-44.0 F)
1997
-39.4 C (-38.9 F)
1998
-37.8 C (-36.0 F)
1999
-37.2 C (-35.0 F)
2000
-35.0 C (-31.0 F)
2001
-31.7 C (-25.1 F)
2002
-36.1 C (-33.0 F)
2003
-37.8 C (-36.0 F)
2004
-38.3 C (-36.9 F)
2005
-38.3 C (-36.9 F)
2006
-31.1 C (-24.0 F)
2007
-32.8 C (-27.0 F)
2008
-36.7 C (-34.1 F)
2009
-38.9 C (-38.0 F)
2010
-37.2 C (-35.0 F)
2011
-38.9 C (-38.0 F)
Wettest day (Rx1day)
The wettest day of the year at Redstone, 1951 to 2011. The record is 83.1 mm (3.3 in) in 1978, marked on the chart; the median year is 33.0 mm (1.3 in).
Wettest day (Rx1day) at Redstone by year
Year
Wettest day (Rx1day)
1951
23.1 mm (0.9 in)
1952
26.2 mm (1.0 in)
1953
52.1 mm (2.1 in)
1954
58.2 mm (2.3 in)
1955
48.3 mm (1.9 in)
1956
18.3 mm (0.7 in)
1957
15.5 mm (0.6 in)
1958
16.5 mm (0.6 in)
1959
43.2 mm (1.7 in)
1960
54.6 mm (2.1 in)
1961
28.4 mm (1.1 in)
1962
57.2 mm (2.3 in)
1963
46.5 mm (1.8 in)
1964
26.4 mm (1.0 in)
1965
43.4 mm (1.7 in)
1966
31.2 mm (1.2 in)
1967
24.4 mm (1.0 in)
1968
38.4 mm (1.5 in)
1969
29.2 mm (1.1 in)
1970
33.0 mm (1.3 in)
1971
26.7 mm (1.1 in)
1972
32.3 mm (1.3 in)
1973
24.1 mm (0.9 in)
1974
29.2 mm (1.1 in)
1975
47.0 mm (1.9 in)
1976
33.5 mm (1.3 in)
1977
36.8 mm (1.4 in)
1978
83.1 mm (3.3 in)
1979
21.1 mm (0.8 in)
1980
33.8 mm (1.3 in)
1981
40.6 mm (1.6 in)
1982
43.2 mm (1.7 in)
1983
24.9 mm (1.0 in)
1984
19.6 mm (0.8 in)
1985
33.5 mm (1.3 in)
1986
40.6 mm (1.6 in)
1987
47.0 mm (1.9 in)
1988
17.3 mm (0.7 in)
1989
19.1 mm (0.8 in)
1990
30.7 mm (1.2 in)
1991
39.4 mm (1.6 in)
1992
37.6 mm (1.5 in)
1993
46.7 mm (1.8 in)
1994
31.0 mm (1.2 in)
1995
53.3 mm (2.1 in)
1996
28.4 mm (1.1 in)
1997
40.9 mm (1.6 in)
1998
31.0 mm (1.2 in)
1999
23.1 mm (0.9 in)
2000
13.7 mm (0.5 in)
2001
18.8 mm (0.7 in)
2002
20.8 mm (0.8 in)
2003
21.1 mm (0.8 in)
2004
40.1 mm (1.6 in)
2005
35.6 mm (1.4 in)
2006
26.9 mm (1.1 in)
2007
58.4 mm (2.3 in)
2008
34.5 mm (1.4 in)
2009
45.7 mm (1.8 in)
2010
30.5 mm (1.2 in)
2011
40.1 mm (1.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Redstone, 1951 to 2011. The record is 104.5 mm (4.1 in) in 1959, marked on the chart; the median year is 48.5 mm (1.9 in).
Wettest five days (Rx5day) at Redstone by year
Year
Wettest five days (Rx5day)
1951
43.4 mm (1.7 in)
1952
44.1 mm (1.7 in)
1953
69.9 mm (2.8 in)
1954
67.9 mm (2.7 in)
1955
49.3 mm (1.9 in)
1956
34.6 mm (1.4 in)
1957
27.0 mm (1.1 in)
1958
21.9 mm (0.9 in)
1959
104.5 mm (4.1 in)
1960
65.3 mm (2.6 in)
1961
28.4 mm (1.1 in)
1962
66.1 mm (2.6 in)
1963
88.1 mm (3.5 in)
1964
48.8 mm (1.9 in)
1965
63.5 mm (2.5 in)
1966
37.1 mm (1.5 in)
1967
43.9 mm (1.7 in)
1968
52.5 mm (2.1 in)
1969
62.0 mm (2.4 in)
1970
34.6 mm (1.4 in)
1971
35.6 mm (1.4 in)
1972
60.3 mm (2.4 in)
1973
44.0 mm (1.7 in)
1974
49.3 mm (1.9 in)
1975
51.9 mm (2.0 in)
1976
58.4 mm (2.3 in)
1977
47.8 mm (1.9 in)
1978
102.7 mm (4.0 in)
1979
30.5 mm (1.2 in)
1980
34.9 mm (1.4 in)
1981
46.5 mm (1.8 in)
1982
65.1 mm (2.6 in)
1983
35.1 mm (1.4 in)
1984
28.5 mm (1.1 in)
1985
46.0 mm (1.8 in)
1986
67.0 mm (2.6 in)
1987
82.8 mm (3.3 in)
1988
28.5 mm (1.1 in)
1989
26.1 mm (1.0 in)
1990
44.4 mm (1.7 in)
1991
57.8 mm (2.3 in)
1992
59.7 mm (2.4 in)
1993
103.4 mm (4.1 in)
1994
50.4 mm (2.0 in)
1995
64.2 mm (2.5 in)
1996
47.9 mm (1.9 in)
1997
88.2 mm (3.5 in)
1998
50.8 mm (2.0 in)
1999
55.8 mm (2.2 in)
2000
19.9 mm (0.8 in)
2001
29.5 mm (1.2 in)
2002
35.3 mm (1.4 in)
2003
32.0 mm (1.3 in)
2004
49.2 mm (1.9 in)
2005
35.6 mm (1.4 in)
2006
40.6 mm (1.6 in)
2007
62.5 mm (2.5 in)
2008
37.0 mm (1.5 in)
2009
51.0 mm (2.0 in)
2010
48.2 mm (1.9 in)
2011
n/a
Longest dry spell (CDD)
The longest dry spell of the year at Redstone, 1951 to 2011. The record is 83 days in 1991, marked on the chart; the median year is 41 days.
Longest dry spell (CDD) at Redstone by year
Year
Longest dry spell (CDD)
1951
21 days
1952
43 days
1953
42 days
1954
67 days
1955
27 days
1956
81 days
1957
42 days
1958
45 days
1959
36 days
1960
77 days
1961
40 days
1962
20 days
1963
67 days
1964
54 days
1965
48 days
1966
54 days
1967
23 days
1968
37 days
1969
57 days
1970
45 days
1971
77 days
1972
33 days
1973
41 days
1974
29 days
1975
55 days
1976
59 days
1977
54 days
1978
44 days
1979
50 days
1980
50 days
1981
48 days
1982
34 days
1983
37 days
1984
27 days
1985
40 days
1986
46 days
1987
76 days
1988
36 days
1989
31 days
1990
40 days
1991
83 days
1992
41 days
1993
38 days
1994
41 days
1995
31 days
1996
36 days
1997
40 days
1998
23 days
1999
49 days
2000
32 days
2001
43 days
2002
27 days
2003
46 days
2004
22 days
2005
44 days
2006
33 days
2007
50 days
2008
21 days
2009
49 days
2010
39 days
2011
1 day
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
47 years with a frost
Across 47 years with a frost, the median last spring frost at Redstone falls on 31 May and the median first autumn frost on 3 September, which leaves a median of 98 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 Redstone
Measure
Median, all years
Earliest period
Recent period (1971 to 2009)
Recent against earliest
Fitted trend
Last spring frost
31 May
n/a
30 May
n/a
-1.0 days per decade
First autumn frost
3 September
n/a
4 September
n/a
+2.0 days per decade
Growing days
98 days
n/a
101 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
53 years, 1952 to 2008
A day with at least 33.1 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 77.0 mm (3.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Redstone: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
33.1 mm (1.3 in)
5 years
45.3 mm (1.8 in)
10 years
53.2 mm (2.1 in)
25 years
63.0 mm (2.5 in)
50 years
70.1 mm (2.8 in)
100 years
77.0 mm (3.0 in)
Longer than the 53 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, 53 years of values from 1952 to 2008.
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: 83.1 mm (3.3 in) in 1978; 58.4 mm (2.3 in) in 2007; 58.2 mm (2.3 in) in 1954.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Redstone standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Redstone 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.