Record envelope, standing records and threshold days for Libby 32 SSE (USC00245020), Montana, United States, with 112 years of record.
Key Facts for Libby 32 SSE
Libby 32 SSE (USC00245020) is a weather station in Montana, United States at 47.96 latitude and -115.21 longitude, 1,049 m (3,440 ft) above sea level.
The station reports from 1910 to 2021, 112 years of record.
1,464 records set at Libby 32 SSE still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Libby 32 SSE set a daily record snowfall of 5.1 cm (2.0 in) on 10 April 2021.
About the Station
Location: Montana, United States, 47.96 latitude, -115.21 longitude.
Elevation: 1,049 m (3,440 ft).
Period of record: 1910 to 2021, 112 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 Libby 32 SSE. 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 Libby 32 SSE, 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)
-42.2 C (-44.0 F)
n/a
n/a
Feb
15.0 C (59.0 F)
-40.0 C (-40.0 F)
n/a
n/a
Mar
23.3 C (73.9 F)
-33.3 C (-27.9 F)
n/a
n/a
Apr
30.6 C (87.1 F)
-18.9 C (-2.0 F)
n/a
n/a
May
31.7 C (89.1 F)
-13.3 C (8.1 F)
n/a
n/a
Jun
36.1 C (97.0 F)
-6.1 C (21.0 F)
n/a
n/a
Jul
36.7 C (98.1 F)
-3.3 C (26.1 F)
n/a
n/a
Aug
38.9 C (102.0 F)
-5.6 C (21.9 F)
n/a
n/a
Sep
37.8 C (100.0 F)
-13.3 C (8.1 F)
n/a
n/a
Oct
27.2 C (81.0 F)
-26.1 C (-15.0 F)
n/a
n/a
Nov
18.3 C (64.9 F)
-32.2 C (-26.0 F)
n/a
n/a
Dec
11.7 C (53.1 F)
-41.7 C (-43.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Libby 32 SSE still stand. 1950 holds the most, with 40.
Standing records at Libby 32 SSE by the year they were set
Year set
Standing records
1910
22
1911
10
1912
3
1949
22
1950
40
1951
29
1952
23
1953
23
1954
21
1955
33
1956
12
1957
18
1958
10
1959
6
1960
25
1961
29
1962
18
1963
23
1964
19
1965
22
1966
15
1967
28
1968
13
1969
15
1970
6
1971
14
1972
29
1973
28
1974
14
1975
16
1976
8
1977
19
1978
9
1979
18
1980
23
1981
22
1982
18
1983
30
1984
26
1985
35
1986
29
1987
26
1988
21
1989
23
1990
17
1991
17
1992
23
1993
35
1994
15
1995
22
1996
18
1997
22
1998
19
1999
24
2000
20
2001
25
2002
31
2003
23
2004
20
2005
26
2006
14
2007
20
2008
25
2009
18
2010
11
2011
15
2012
9
2013
14
2014
16
2015
17
2016
9
2017
1
2018
11
2019
13
2020
15
2021
6
All-Time Record Progression
3 new records
3 all-time records were set at Libby 32 SSE between 2 February 1989 and 20 March 2002. Each dot is a new record.
When Libby 32 SSE set new all-time records
Date
Kind
Detail
1989-02-02
Record low maximum temperature
Record low maximum temperature -25.0 C (-13.0 F)
1996-11-19
Record daily snowfall
Record daily snowfall 46.0 cm (18.1 in)
2002-03-20
Record daily snowfall
Record daily snowfall 48.0 cm (18.9 in)
Wettest Day of Each Month
Jun: 96.5 mm (3.8 in)
The wettest day on record for each calendar month at Libby 32 SSE. The most was 96.5 mm (3.8 in) on 30 June 1911.
Record daily precipitation for each month at Libby 32 SSE
Month
Record daily precipitation (mm)
Date
Jan
50.8 mm (2.0 in)
9 January 1953
Feb
52.6 mm (2.1 in)
5 February 2018
Mar
53.3 mm (2.1 in)
3 March 2017
Apr
35.8 mm (1.4 in)
6 April 1972
May
54.4 mm (2.1 in)
27 May 1998
Jun
96.5 mm (3.8 in)
30 June 1911
Jul
40.6 mm (1.6 in)
17 July 1954
Aug
40.6 mm (1.6 in)
27 August 1966
Sep
33.3 mm (1.3 in)
18 September 1957
Oct
40.4 mm (1.6 in)
27 October 1994
Nov
59.2 mm (2.3 in)
10 November 2017
Dec
49.0 mm (1.9 in)
8 December 2015
Period of Record Coverage
1910 to 2021
Complete yearUnder 90 percent of days
76 years of record at Libby 32 SSE, 1910 to 2021. 11 years have data for under 90 percent of days and are left out of rankings: 1910, 1911, 1912, 1949, 1958, 1959, 2014, 2017 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 60 complete years at Libby 32 SSE, 1950 to 2020. Blue stripes are years cooler than the station's own mean of 4.8 C (40.6 F); red stripes are warmer. The coolest year was 1985, at 2.4 C (36.2 F), and the warmest was 1953, at 6.3 C (43.3 F). The strongest colour marks a difference of 2.5 C (4.5 F).
Annual mean temperature at Libby 32 SSE as warming stripes, 1950 to 2020
Year
Annual mean temperature
Difference from the station mean
1950
3.9 C
-0.92 C
1951
3.9 C
-0.90 C
1952
5.3 C
+0.54 C
1953
6.3 C
+1.47 C
1954
4.6 C
-0.18 C
1955
3.5 C
-1.28 C
1956
4.8 C
+0.04 C
1957
4.7 C
-0.04 C
1960
4.6 C
-0.17 C
1961
5.6 C
+0.79 C
1962
5.1 C
+0.33 C
1963
5.5 C
+0.73 C
1964
4.4 C
-0.40 C
1965
5.2 C
+0.42 C
1966
5.7 C
+0.90 C
1967
6.0 C
+1.26 C
1968
5.0 C
+0.18 C
1969
5.0 C
+0.18 C
1970
5.2 C
+0.43 C
1971
5.1 C
+0.34 C
1972
4.9 C
+0.15 C
1973
5.8 C
+0.97 C
1974
5.9 C
+1.14 C
1975
4.7 C
-0.04 C
1976
5.7 C
+0.89 C
1977
5.2 C
+0.39 C
1978
4.8 C
-0.01 C
1979
5.2 C
+0.39 C
1980
5.1 C
+0.35 C
1981
5.1 C
+0.28 C
1982
3.3 C
-1.47 C
1983
4.3 C
-0.53 C
1984
4.1 C
-0.70 C
1985
2.4 C
-2.42 C
1987
4.5 C
-0.25 C
1988
4.9 C
+0.07 C
1989
4.0 C
-0.80 C
1990
4.6 C
-0.23 C
1992
5.0 C
+0.20 C
1993
3.1 C
-1.69 C
1994
4.7 C
-0.10 C
1995
4.8 C
-0.03 C
1997
4.5 C
-0.33 C
1998
5.9 C
+1.14 C
1999
5.1 C
+0.32 C
2000
3.9 C
-0.85 C
2001
4.6 C
-0.16 C
2002
4.4 C
-0.42 C
2003
5.0 C
+0.24 C
2004
5.4 C
+0.57 C
2005
4.8 C
-0.02 C
2006
4.9 C
+0.07 C
2008
4.0 C
-0.78 C
2009
4.6 C
-0.17 C
2010
4.6 C
-0.22 C
2011
4.2 C
-0.58 C
2012
5.1 C
+0.27 C
2013
4.5 C
-0.33 C
2016
5.5 C
+0.72 C
2020
5.0 C
+0.21 C
The fitted trend in annual mean temperature here over 1950 to 2020 is -0.05 C (-0.15 to 0.05) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.3 to 0.1) per decade. The slope is a straight line fitted to 60 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Libby 32 SSE
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.05 C (-0.15 to 0.05) per decade
-0.1 F (-0.3 to 0.1) per decade
1950 to 2020
60
Not clearly different from zero
Mean daily maximum
0.09 C (-0.01 to 0.20) per decade
0.17 F (-0.02 to 0.36) per decade
1950 to 2020
60
Not clearly different from zero
Mean daily minimum
-0.2 C (-0.3 to -0.1) per decade
-0.4 F (-0.6 to -0.1) per decade
1950 to 2020
60
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
1910 to 2021
Yearly extremes at Libby 32 SSE: 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)
1961
33.9 C (93.0 F)
76
Coldest night (TNn)
-42.2 C (-44.0 F)
1950
-30.6 C (-23.1 F)
76
Wettest day (Rx1day)
96.5 mm (3.8 in)
1911
27.0 mm (1.1 in)
76
Wettest five days (Rx5day)
143.3 mm (5.6 in)
1974
56.2 mm (2.2 in)
76
Longest dry spell (CDD)
69 days
1987
26 days
76
Hottest day (TXx)
The hottest day of the year at Libby 32 SSE, 1910 to 2021. The record is 38.9 C (102.0 F) in 1961, marked on the chart; the median year is 33.9 C (93.0 F).
Hottest day (TXx) at Libby 32 SSE by year
Year
Hottest day (TXx)
1910
36.7 C (98.1 F)
1911
30.0 C (86.0 F)
1912
8.3 C (46.9 F)
1948
n/a
1949
34.4 C (93.9 F)
1950
37.8 C (100.0 F)
1951
34.4 C (93.9 F)
1952
35.6 C (96.1 F)
1953
36.7 C (98.1 F)
1954
32.2 C (90.0 F)
1955
33.9 C (93.0 F)
1956
33.9 C (93.0 F)
1957
31.1 C (88.0 F)
1958
31.7 C (89.1 F)
1959
29.4 C (84.9 F)
1960
36.7 C (98.1 F)
1961
38.9 C (102.0 F)
1962
36.1 C (97.0 F)
1963
36.1 C (97.0 F)
1964
33.9 C (93.0 F)
1965
34.4 C (93.9 F)
1966
33.3 C (91.9 F)
1967
36.1 C (97.0 F)
1968
33.9 C (93.0 F)
1969
36.1 C (97.0 F)
1970
33.9 C (93.0 F)
1971
34.4 C (93.9 F)
1972
33.9 C (93.0 F)
1973
33.9 C (93.0 F)
1974
33.3 C (91.9 F)
1975
35.0 C (95.0 F)
1976
32.2 C (90.0 F)
1977
34.4 C (93.9 F)
1978
33.9 C (93.0 F)
1979
35.0 C (95.0 F)
1980
33.3 C (91.9 F)
1981
35.6 C (96.1 F)
1982
31.7 C (89.1 F)
1983
33.9 C (93.0 F)
1984
35.6 C (96.1 F)
1985
35.6 C (96.1 F)
1986
32.2 C (90.0 F)
1987
32.2 C (90.0 F)
1988
33.9 C (93.0 F)
1989
32.2 C (90.0 F)
1990
33.9 C (93.0 F)
1991
32.8 C (91.0 F)
1992
34.4 C (93.9 F)
1993
30.0 C (86.0 F)
1994
35.6 C (96.1 F)
1995
29.4 C (84.9 F)
1996
33.3 C (91.9 F)
1997
32.2 C (90.0 F)
1998
35.0 C (95.0 F)
1999
32.8 C (91.0 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
32.8 C (91.0 F)
2005
32.8 C (91.0 F)
2006
34.4 C (93.9 F)
2007
35.6 C (96.1 F)
2008
33.9 C (93.0 F)
2009
32.8 C (91.0 F)
2010
31.7 C (89.1 F)
2011
30.6 C (87.1 F)
2012
30.6 C (87.1 F)
2013
32.2 C (90.0 F)
2014
32.8 C (91.0 F)
2015
36.1 C (97.0 F)
2016
31.7 C (89.1 F)
2017
30.6 C (87.1 F)
2018
31.7 C (89.1 F)
2019
32.8 C (91.0 F)
2020
34.4 C (93.9 F)
2021
17.2 C (63.0 F)
Coldest night (TNn)
The coldest night of the year at Libby 32 SSE, 1910 to 2021. The record is -42.2 C (-44.0 F) in 1950, marked on the chart; the median year is -30.6 C (-23.1 F).
Coldest night (TNn) at Libby 32 SSE by year
Year
Coldest night (TNn)
1910
-15.0 C (5.0 F)
1911
-28.9 C (-20.0 F)
1912
-27.8 C (-18.0 F)
1948
n/a
1949
-26.7 C (-16.1 F)
1950
-42.2 C (-44.0 F)
1951
-36.7 C (-34.1 F)
1952
-33.3 C (-27.9 F)
1953
-21.1 C (-6.0 F)
1954
-30.0 C (-22.0 F)
1955
-30.0 C (-22.0 F)
1956
-30.6 C (-23.1 F)
1957
-33.9 C (-29.0 F)
1958
-19.4 C (-2.9 F)
1959
-32.2 C (-26.0 F)
1960
-30.6 C (-23.1 F)
1961
-30.6 C (-23.1 F)
1962
-31.7 C (-25.1 F)
1963
-33.3 C (-27.9 F)
1964
-35.6 C (-32.1 F)
1965
-25.6 C (-14.1 F)
1966
-22.2 C (-8.0 F)
1967
-21.7 C (-7.1 F)
1968
-38.3 C (-36.9 F)
1969
-25.6 C (-14.1 F)
1970
-25.0 C (-13.0 F)
1971
-23.9 C (-11.0 F)
1972
-30.6 C (-23.1 F)
1973
-29.4 C (-20.9 F)
1974
-28.3 C (-18.9 F)
1975
-25.6 C (-14.1 F)
1976
-23.9 C (-11.0 F)
1977
-25.0 C (-13.0 F)
1978
-33.9 C (-29.0 F)
1979
-34.4 C (-29.9 F)
1980
-30.6 C (-23.1 F)
1981
-29.4 C (-20.9 F)
1982
-38.9 C (-38.0 F)
1983
-38.9 C (-38.0 F)
1984
-31.1 C (-24.0 F)
1985
-37.8 C (-36.0 F)
1986
-27.2 C (-17.0 F)
1987
-27.2 C (-17.0 F)
1988
-30.0 C (-22.0 F)
1989
-36.1 C (-33.0 F)
1990
-41.7 C (-43.1 F)
1991
-26.7 C (-16.1 F)
1992
-25.6 C (-14.1 F)
1993
-37.2 C (-35.0 F)
1994
-38.9 C (-38.0 F)
1995
-27.2 C (-17.0 F)
1996
-39.4 C (-38.9 F)
1997
-33.9 C (-29.0 F)
1998
-35.6 C (-32.1 F)
1999
-20.0 C (-4.0 F)
2000
-28.3 C (-18.9 F)
2001
-31.7 C (-25.1 F)
2002
-30.0 C (-22.0 F)
2003
-27.8 C (-18.0 F)
2004
-41.1 C (-42.0 F)
2005
-34.4 C (-29.9 F)
2006
-34.4 C (-29.9 F)
2007
-31.7 C (-25.1 F)
2008
-36.1 C (-33.0 F)
2009
-33.3 C (-27.9 F)
2010
-32.2 C (-26.0 F)
2011
-32.2 C (-26.0 F)
2012
-22.8 C (-9.0 F)
2013
-30.6 C (-23.1 F)
2014
-40.0 C (-40.0 F)
2015
-22.8 C (-9.0 F)
2016
-31.7 C (-25.1 F)
2017
-28.3 C (-18.9 F)
2018
-29.4 C (-20.9 F)
2019
-19.4 C (-2.9 F)
2020
-24.4 C (-11.9 F)
2021
-29.4 C (-20.9 F)
Wettest day (Rx1day)
The wettest day of the year at Libby 32 SSE, 1910 to 2021. The record is 96.5 mm (3.8 in) in 1911, marked on the chart; the median year is 27.0 mm (1.1 in).
Wettest day (Rx1day) at Libby 32 SSE by year
Year
Wettest day (Rx1day)
1910
21.1 mm (0.8 in)
1911
96.5 mm (3.8 in)
1912
11.4 mm (0.4 in)
1948
n/a
1949
25.1 mm (1.0 in)
1950
26.2 mm (1.0 in)
1951
23.9 mm (0.9 in)
1952
25.4 mm (1.0 in)
1953
50.8 mm (2.0 in)
1954
40.6 mm (1.6 in)
1955
49.5 mm (1.9 in)
1956
20.1 mm (0.8 in)
1957
33.3 mm (1.3 in)
1958
19.8 mm (0.8 in)
1959
21.1 mm (0.8 in)
1960
28.2 mm (1.1 in)
1961
23.1 mm (0.9 in)
1962
18.3 mm (0.7 in)
1963
32.0 mm (1.3 in)
1964
57.7 mm (2.3 in)
1965
22.9 mm (0.9 in)
1966
40.6 mm (1.6 in)
1967
26.7 mm (1.1 in)
1968
27.2 mm (1.1 in)
1969
30.5 mm (1.2 in)
1970
30.2 mm (1.2 in)
1971
25.4 mm (1.0 in)
1972
35.8 mm (1.4 in)
1973
24.6 mm (1.0 in)
1974
46.0 mm (1.8 in)
1975
26.7 mm (1.1 in)
1976
24.4 mm (1.0 in)
1977
26.2 mm (1.0 in)
1978
27.7 mm (1.1 in)
1979
27.9 mm (1.1 in)
1980
30.5 mm (1.2 in)
1981
21.8 mm (0.9 in)
1982
29.5 mm (1.2 in)
1983
25.9 mm (1.0 in)
1984
34.3 mm (1.4 in)
1985
23.9 mm (0.9 in)
1986
27.9 mm (1.1 in)
1987
37.8 mm (1.5 in)
1988
20.1 mm (0.8 in)
1989
27.7 mm (1.1 in)
1990
43.7 mm (1.7 in)
1991
20.3 mm (0.8 in)
1992
38.9 mm (1.5 in)
1993
27.9 mm (1.1 in)
1994
40.4 mm (1.6 in)
1995
24.4 mm (1.0 in)
1996
45.0 mm (1.8 in)
1997
30.2 mm (1.2 in)
1998
54.4 mm (2.1 in)
1999
24.9 mm (1.0 in)
2000
20.6 mm (0.8 in)
2001
17.3 mm (0.7 in)
2002
25.4 mm (1.0 in)
2003
23.1 mm (0.9 in)
2004
25.4 mm (1.0 in)
2005
27.4 mm (1.1 in)
2006
36.3 mm (1.4 in)
2007
20.8 mm (0.8 in)
2008
21.6 mm (0.9 in)
2009
25.9 mm (1.0 in)
2010
33.0 mm (1.3 in)
2011
15.7 mm (0.6 in)
2012
24.6 mm (1.0 in)
2013
20.6 mm (0.8 in)
2014
54.6 mm (2.1 in)
2015
49.0 mm (1.9 in)
2016
44.5 mm (1.8 in)
2017
59.2 mm (2.3 in)
2018
52.6 mm (2.1 in)
2019
30.5 mm (1.2 in)
2020
25.4 mm (1.0 in)
2021
18.3 mm (0.7 in)
Wettest five days (Rx5day)
The wettest five days of the year at Libby 32 SSE, 1910 to 2021. The record is 143.3 mm (5.6 in) in 1974, marked on the chart; the median year is 56.2 mm (2.2 in).
Wettest five days (Rx5day) at Libby 32 SSE by year
Year
Wettest five days (Rx5day)
1910
46.8 mm (1.8 in)
1911
96.5 mm (3.8 in)
1912
19.0 mm (0.7 in)
1948
n/a
1949
39.6 mm (1.6 in)
1950
84.4 mm (3.3 in)
1951
56.7 mm (2.2 in)
1952
43.5 mm (1.7 in)
1953
98.9 mm (3.9 in)
1954
75.9 mm (3.0 in)
1955
88.0 mm (3.5 in)
1956
42.5 mm (1.7 in)
1957
68.8 mm (2.7 in)
1958
35.3 mm (1.4 in)
1959
54.8 mm (2.2 in)
1960
44.2 mm (1.7 in)
1961
61.2 mm (2.4 in)
1962
43.3 mm (1.7 in)
1963
61.9 mm (2.4 in)
1964
104.1 mm (4.1 in)
1965
51.1 mm (2.0 in)
1966
56.4 mm (2.2 in)
1967
55.7 mm (2.2 in)
1968
55.9 mm (2.2 in)
1969
57.1 mm (2.2 in)
1970
57.1 mm (2.2 in)
1971
70.1 mm (2.8 in)
1972
79.5 mm (3.1 in)
1973
41.2 mm (1.6 in)
1974
143.3 mm (5.6 in)
1975
90.5 mm (3.6 in)
1976
44.7 mm (1.8 in)
1977
47.3 mm (1.9 in)
1978
50.6 mm (2.0 in)
1979
53.9 mm (2.1 in)
1980
72.6 mm (2.9 in)
1981
51.5 mm (2.0 in)
1982
60.7 mm (2.4 in)
1983
54.3 mm (2.1 in)
1984
57.7 mm (2.3 in)
1985
52.8 mm (2.1 in)
1986
48.1 mm (1.9 in)
1987
53.3 mm (2.1 in)
1988
43.8 mm (1.7 in)
1989
64.8 mm (2.6 in)
1990
79.3 mm (3.1 in)
1991
38.8 mm (1.5 in)
1992
60.8 mm (2.4 in)
1993
62.4 mm (2.5 in)
1994
74.1 mm (2.9 in)
1995
73.6 mm (2.9 in)
1996
96.5 mm (3.8 in)
1997
95.6 mm (3.8 in)
1998
85.7 mm (3.4 in)
1999
37.4 mm (1.5 in)
2000
32.7 mm (1.3 in)
2001
32.5 mm (1.3 in)
2002
56.4 mm (2.2 in)
2003
40.9 mm (1.6 in)
2004
55.6 mm (2.2 in)
2005
61.1 mm (2.4 in)
2006
86.1 mm (3.4 in)
2007
30.6 mm (1.2 in)
2008
44.0 mm (1.7 in)
2009
43.7 mm (1.7 in)
2010
68.6 mm (2.7 in)
2011
39.6 mm (1.6 in)
2012
47.7 mm (1.9 in)
2013
38.9 mm (1.5 in)
2014
68.6 mm (2.7 in)
2015
87.8 mm (3.5 in)
2016
52.6 mm (2.1 in)
2017
99.3 mm (3.9 in)
2018
59.2 mm (2.3 in)
2019
47.3 mm (1.9 in)
2020
61.5 mm (2.4 in)
2021
24.4 mm (1.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Libby 32 SSE, 1910 to 2021. The record is 69 days in 1987, marked on the chart; the median year is 26 days.
Longest dry spell (CDD) at Libby 32 SSE by year
Year
Longest dry spell (CDD)
1910
32 days
1911
17 days
1912
10 days
1948
n/a
1949
17 days
1950
20 days
1951
32 days
1952
30 days
1953
35 days
1954
25 days
1955
41 days
1956
25 days
1957
15 days
1958
14 days
1959
8 days
1960
40 days
1961
23 days
1962
20 days
1963
37 days
1964
14 days
1965
23 days
1966
31 days
1967
53 days
1968
24 days
1969
66 days
1970
32 days
1971
22 days
1972
17 days
1973
29 days
1974
31 days
1975
17 days
1976
15 days
1977
36 days
1978
32 days
1979
33 days
1980
21 days
1981
53 days
1982
16 days
1983
20 days
1984
36 days
1985
31 days
1986
37 days
1987
69 days
1988
20 days
1989
15 days
1990
35 days
1991
31 days
1992
16 days
1993
22 days
1994
29 days
1995
17 days
1996
36 days
1997
17 days
1998
21 days
1999
19 days
2000
48 days
2001
22 days
2002
27 days
2003
32 days
2004
17 days
2005
26 days
2006
28 days
2007
42 days
2008
26 days
2009
25 days
2010
33 days
2011
20 days
2012
26 days
2013
24 days
2014
24 days
2015
33 days
2016
24 days
2017
27 days
2018
35 days
2019
28 days
2020
32 days
2021
19 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
60 years with a frost
Across 60 years with a frost, the median last spring frost at Libby 32 SSE falls on 23 June and the median first autumn frost on 11 July, which leaves a median of 19 days between them.
In 1982 to 2020 the median growing season was 15 days. That is 42 days fewer than in 1950 to 1981.
Fitted over all years, the growing season changes by -6.7 days per decade at this station.
Frost dates and growing season at Libby 32 SSE
Measure
Median, all years
Earliest period (1950 to 1981)
Recent period (1982 to 2020)
Recent against earliest
Fitted trend
Last spring frost
23 June
18 June
24 June
6 days later
+1.2 days per decade
First autumn frost
11 July
11 August
5 July
37 days earlier
-5.4 days per decade
Growing days
19 days
57 days
15 days
42 days fewer
-6.7 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
65 years, 1950 to 2020
A day with at least 27.8 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 66.9 mm (2.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Libby 32 SSE: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
27.8 mm (1.1 in)
5 years
36.0 mm (1.4 in)
10 years
42.3 mm (1.7 in)
25 years
51.2 mm (2.0 in)
50 years
58.7 mm (2.3 in)
100 years
66.9 mm (2.6 in)
Longer than the 65 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, 65 years of values from 1950 to 2020.
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: 57.7 mm (2.3 in) in 1964; 54.4 mm (2.1 in) in 1998; 50.8 mm (2.0 in) in 1953.
Station Changes
3 suspected
3 changes were suspected in the annual mean temperature of Libby 32 SSE, at 1969, 1981 and 1995. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1969 ran 0.3 C (0.6 F) higher than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1981 ran 1.0 C (1.8 F) lower than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1995 ran 0.4 C (0.7 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Libby 32 SSE, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1969
+0.3
+0.6
likely
5
1981
-1.0
-1.8
likely
5
1995
+0.4
+0.7
likely
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 Libby 32 SSE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Libby 32 SSE 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.