Sandy Lake Dam Libby Weather Records (USC00217460)
Record envelope, standing records and threshold days for Sandy Lake Dam Libby (USC00217460), Minnesota, United States, with 134 years of record.
Key Facts for Sandy Lake Dam Libby
Sandy Lake Dam Libby (USC00217460) is a weather station in Minnesota, United States at 46.80 latitude and -93.32 longitude, 376 m (1,234 ft) above sea level.
The station reports from 1893 to 2026, 134 years of record.
1,464 records set at Sandy Lake Dam Libby still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Sandy Lake Dam Libby set a daily record precipitation of 47.5 mm (1.9 in) on 30 June 2026.
About the Station
Location: Minnesota, United States, 46.80 latitude, -93.32 longitude.
Elevation: 376 m (1,234 ft).
Period of record: 1893 to 2026, 134 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
3 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 Sandy Lake Dam Libby. The lines show the 2026 daily maximum and minimum. 3 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Sandy Lake Dam Libby, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
12.2 C (54.0 F)
-46.7 C (-52.1 F)
3.9 C (39.0 F)
-35.0 C (-31.0 F)
Feb
13.9 C (57.0 F)
-45.0 C (-49.0 F)
10.6 C (51.1 F)
-26.7 C (-16.1 F)
Mar
25.6 C (78.1 F)
-40.0 C (-40.0 F)
20.6 C (69.1 F)
-23.3 C (-9.9 F)
Apr
32.2 C (90.0 F)
-22.8 C (-9.0 F)
25.0 C (77.0 F)
-13.3 C (8.1 F)
May
38.3 C (100.9 F)
-10.6 C (12.9 F)
31.7 C (89.1 F)
-2.8 C (27.0 F)
Jun
36.1 C (97.0 F)
-2.8 C (27.0 F)
31.1 C (88.0 F)
5.6 C (42.1 F)
Jul
38.9 C (102.0 F)
1.7 C (35.1 F)
35.0 C (95.0 F)
8.3 C (46.9 F)
Aug
38.3 C (100.9 F)
-2.8 C (27.0 F)
28.3 C (82.9 F)
7.2 C (45.0 F)
Sep
36.7 C (98.1 F)
-8.3 C (17.1 F)
28.9 C (84.0 F)
4.4 C (39.9 F)
Oct
30.0 C (86.0 F)
-16.1 C (3.0 F)
24.4 C (75.9 F)
0.0 C (32.0 F)
Nov
23.3 C (73.9 F)
-35.6 C (-32.1 F)
n/a
n/a
Dec
15.6 C (60.1 F)
-42.8 C (-45.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Sandy Lake Dam Libby still stand. 1936 holds the most, with 39.
Standing records at Sandy Lake Dam Libby by the year they were set
Year set
Standing records
1893
9
1894
1
1895
8
1896
20
1897
12
1898
10
1899
20
1900
12
1901
20
1902
6
1903
14
1904
8
1905
11
1906
14
1907
11
1908
16
1909
12
1910
13
1911
14
1912
24
1913
18
1914
11
1915
14
1916
15
1917
23
1918
11
1919
21
1920
8
1921
17
1922
6
1923
16
1924
19
1925
23
1926
13
1927
15
1928
9
1929
15
1930
22
1931
27
1932
15
1933
13
1934
14
1935
17
1936
39
1937
8
1938
9
1939
21
1940
13
1941
16
1942
10
1943
4
1944
7
1945
9
1946
9
1947
18
1948
10
1949
8
1950
15
1951
10
1952
11
1953
11
1954
7
1955
4
1956
12
1958
6
1959
9
1961
16
1962
17
1963
9
1964
15
1965
8
1966
10
1967
6
1968
8
1969
8
1970
7
1971
5
1972
9
1973
9
1974
9
1975
6
1976
27
1977
12
1978
4
1979
3
1980
5
1981
11
1982
6
1983
14
1984
15
1985
6
1986
5
1987
19
1988
12
1989
8
1990
10
1991
21
1992
5
1993
5
1994
6
1995
10
1996
13
1997
4
1998
7
1999
8
2000
7
2001
9
2002
7
2003
7
2004
5
2005
7
2006
10
2007
4
2008
4
2009
7
2010
5
2011
3
2012
14
2013
6
2014
11
2015
11
2016
7
2017
12
2018
8
2019
5
2020
4
2021
12
2022
1
2023
13
2024
8
2025
13
2026
3
All-Time Record Progression
8 new records
8 all-time records were set at Sandy Lake Dam Libby between 29 August 1925 and 20 June 2012. Each dot is a new record.
When Sandy Lake Dam Libby set new all-time records
Date
Kind
Detail
1925-08-29
Record daily precipitation
Record daily precipitation 96.5 mm (3.8 in)
1934-05-31
Record high maximum temperature
Record high maximum temperature 38.3 C (100.9 F)
1936-01-23
Record low maximum temperature
Record low maximum temperature -30.0 C (-22.0 F)
1942-10-25
Record daily snowfall
Record daily snowfall 38.1 cm (15.0 in)
1953-08-06
Record daily precipitation
Record daily precipitation 103.9 mm (4.1 in)
1972-07-28
Record daily precipitation
Record daily precipitation 118.1 mm (4.6 in)
1988-07-28
Record high maximum temperature
Record high maximum temperature 38.9 C (102.0 F)
2012-06-20
Record daily precipitation
Record daily precipitation 128.5 mm (5.1 in)
Wettest Day of Each Month
Jun: 128.5 mm (5.1 in)
The wettest day on record for each calendar month at Sandy Lake Dam Libby. The most was 128.5 mm (5.1 in) on 20 June 2012.
Record daily precipitation for each month at Sandy Lake Dam Libby
Month
Record daily precipitation (mm)
Date
Jan
32.0 mm (1.3 in)
11 January 1975
Feb
57.2 mm (2.3 in)
23 February 1893
Mar
36.3 mm (1.4 in)
15 March 1945
Apr
75.2 mm (3.0 in)
15 April 1894
May
74.9 mm (2.9 in)
29 May 1978
Jun
128.5 mm (5.1 in)
20 June 2012
Jul
118.1 mm (4.6 in)
28 July 1972
Aug
107.4 mm (4.2 in)
31 August 1989
Sep
107.7 mm (4.2 in)
1 September 1986
Oct
110.0 mm (4.3 in)
2 October 1995
Nov
45.7 mm (1.8 in)
28 November 1905
Dec
30.7 mm (1.2 in)
16 December 2021
Period of Record Coverage
1897 to 2026
Complete yearUnder 90 percent of days
130 years of record at Sandy Lake Dam Libby, 1897 to 2026. 30 years have data for under 90 percent of days and are left out of rankings: 1897, 1910, 1990, 1991, 1992, 1993, 1994, 1995 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 96 complete years at Sandy Lake Dam Libby, 1898 to 2025. Blue stripes are years cooler than the station's own mean of 4.4 C (39.9 F); red stripes are warmer. The coolest year was 1917, at 1.1 C (33.9 F), and the warmest was 1987, at 7.7 C (45.8 F). The strongest colour marks a difference of 3.4 C (6.1 F).
Annual mean temperature at Sandy Lake Dam Libby as warming stripes, 1898 to 2025
Year
Annual mean temperature
Difference from the station mean
1898
3.7 C
-0.68 C
1899
3.1 C
-1.35 C
1901
4.1 C
-0.31 C
1902
4.3 C
-0.06 C
1903
3.0 C
-1.36 C
1905
4.0 C
-0.38 C
1906
4.8 C
+0.38 C
1907
3.6 C
-0.83 C
1908
5.7 C
+1.26 C
1909
4.1 C
-0.27 C
1911
3.6 C
-0.77 C
1912
3.0 C
-1.39 C
1913
3.9 C
-0.48 C
1914
4.0 C
-0.44 C
1915
4.6 C
+0.19 C
1916
2.3 C
-2.12 C
1917
1.1 C
-3.33 C
1918
4.4 C
+0.04 C
1919
3.6 C
-0.77 C
1920
3.4 C
-0.96 C
1921
5.7 C
+1.34 C
1922
5.2 C
+0.83 C
1923
4.8 C
+0.44 C
1924
3.0 C
-1.40 C
1925
4.5 C
+0.07 C
1926
3.2 C
-1.20 C
1927
3.0 C
-1.36 C
1928
4.5 C
+0.14 C
1929
3.1 C
-1.35 C
1930
4.8 C
+0.36 C
1931
7.1 C
+2.66 C
1932
4.0 C
-0.41 C
1933
3.9 C
-0.54 C
1934
3.9 C
-0.54 C
1935
3.4 C
-0.99 C
1936
2.5 C
-1.86 C
1937
2.8 C
-1.63 C
1938
4.5 C
+0.08 C
1939
4.6 C
+0.17 C
1940
3.9 C
-0.53 C
1941
5.6 C
+1.21 C
1942
5.0 C
+0.56 C
1943
4.0 C
-0.40 C
1944
5.5 C
+1.09 C
1945
3.9 C
-0.47 C
1946
4.6 C
+0.24 C
1947
4.2 C
-0.16 C
1948
4.3 C
-0.08 C
1949
4.8 C
+0.40 C
1950
2.4 C
-1.98 C
1951
3.1 C
-1.28 C
1952
5.1 C
+0.69 C
1953
5.5 C
+1.12 C
1954
4.8 C
+0.38 C
1955
4.4 C
+0.04 C
1956
4.2 C
-0.25 C
1957
4.2 C
-0.21 C
1958
4.5 C
+0.11 C
1959
4.3 C
-0.13 C
1961
5.5 C
+1.06 C
1962
4.5 C
+0.13 C
1963
5.1 C
+0.74 C
1964
5.2 C
+0.77 C
1965
3.8 C
-0.58 C
1966
4.2 C
-0.25 C
1967
4.1 C
-0.28 C
1968
5.1 C
+0.69 C
1969
4.7 C
+0.31 C
1970
4.1 C
-0.29 C
1971
4.3 C
-0.08 C
1972
3.2 C
-1.20 C
1973
6.0 C
+1.63 C
1974
5.1 C
+0.65 C
1975
5.0 C
+0.61 C
1976
4.8 C
+0.42 C
1977
5.1 C
+0.72 C
1978
4.7 C
+0.33 C
1979
3.6 C
-0.76 C
1980
4.8 C
+0.43 C
1981
5.8 C
+1.42 C
1982
3.3 C
-1.06 C
1983
5.2 C
+0.78 C
1984
5.6 C
+1.21 C
1985
4.5 C
+0.11 C
1986
5.9 C
+1.46 C
1987
7.7 C
+3.26 C
1988
5.3 C
+0.86 C
1989
4.3 C
-0.15 C
2015
5.9 C
+1.52 C
2018
4.0 C
-0.43 C
2019
3.4 C
-0.98 C
2021
6.0 C
+1.58 C
2022
3.4 C
-0.97 C
2023
5.8 C
+1.37 C
2024
6.8 C
+2.42 C
2025
5.2 C
+0.83 C
The annual mean temperature here has risen by 0.1 C (0.1 to 0.2) per decade over 1898 to 2025. In Fahrenheit: 0.2 F (0.1 to 0.3) per decade. The slope is a straight line fitted to 96 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Sandy Lake Dam Libby
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.1 C (0.1 to 0.2) per decade
0.2 F (0.1 to 0.3) per decade
1898 to 2025
96
Rise
Mean daily maximum
0.1 C (0.1 to 0.2) per decade
0.2 F (0.1 to 0.3) per decade
1898 to 2025
96
Rise
Mean daily minimum
0.1 C (0.1 to 0.2) per decade
0.3 F (0.1 to 0.4) per decade
1898 to 2025
96
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
1893 to 2026
Yearly extremes at Sandy Lake Dam Libby: 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)
1988
33.3 C (91.9 F)
130
Coldest night (TNn)
-46.7 C (-52.1 F)
1899
-36.7 C (-34.1 F)
134
Wettest day (Rx1day)
128.5 mm (5.1 in)
2012
50.8 mm (2.0 in)
134
Wettest five days (Rx5day)
229.1 mm (9.0 in)
1953
80.0 mm (3.1 in)
134
Longest dry spell (CDD)
69 days
1893
23 days
134
Hottest day (TXx)
The hottest day of the year at Sandy Lake Dam Libby, 1893 to 2026. The record is 38.9 C (102.0 F) in 1988, marked on the chart; the median year is 33.3 C (91.9 F).
Hottest day (TXx) at Sandy Lake Dam Libby by year
Year
Hottest day (TXx)
1893
n/a
1894
n/a
1895
n/a
1896
n/a
1897
31.7 C (89.1 F)
1898
32.2 C (90.0 F)
1899
32.2 C (90.0 F)
1900
35.0 C (95.0 F)
1901
36.7 C (98.1 F)
1902
32.2 C (90.0 F)
1903
32.2 C (90.0 F)
1904
33.3 C (91.9 F)
1905
32.2 C (90.0 F)
1906
32.8 C (91.0 F)
1907
32.2 C (90.0 F)
1908
34.4 C (93.9 F)
1909
30.6 C (87.1 F)
1910
36.1 C (97.0 F)
1911
33.9 C (93.0 F)
1912
34.4 C (93.9 F)
1913
33.9 C (93.0 F)
1914
33.9 C (93.0 F)
1915
30.6 C (87.1 F)
1916
33.9 C (93.0 F)
1917
36.1 C (97.0 F)
1918
35.0 C (95.0 F)
1919
32.8 C (91.0 F)
1920
31.1 C (88.0 F)
1921
35.6 C (96.1 F)
1922
34.4 C (93.9 F)
1923
33.3 C (91.9 F)
1924
30.6 C (87.1 F)
1925
32.8 C (91.0 F)
1926
32.8 C (91.0 F)
1927
32.8 C (91.0 F)
1928
31.7 C (89.1 F)
1929
36.7 C (98.1 F)
1930
35.0 C (95.0 F)
1931
35.6 C (96.1 F)
1932
34.4 C (93.9 F)
1933
33.3 C (91.9 F)
1934
38.3 C (100.9 F)
1935
33.3 C (91.9 F)
1936
37.8 C (100.0 F)
1937
32.8 C (91.0 F)
1938
31.1 C (88.0 F)
1939
32.2 C (90.0 F)
1940
32.8 C (91.0 F)
1941
35.0 C (95.0 F)
1942
31.7 C (89.1 F)
1943
32.2 C (90.0 F)
1944
32.2 C (90.0 F)
1945
33.3 C (91.9 F)
1946
31.1 C (88.0 F)
1947
37.2 C (99.0 F)
1948
33.9 C (93.0 F)
1949
34.4 C (93.9 F)
1950
31.1 C (88.0 F)
1951
30.6 C (87.1 F)
1952
31.7 C (89.1 F)
1953
31.1 C (88.0 F)
1954
30.6 C (87.1 F)
1955
32.8 C (91.0 F)
1956
32.8 C (91.0 F)
1957
31.7 C (89.1 F)
1958
33.3 C (91.9 F)
1959
32.2 C (90.0 F)
1960
32.8 C (91.0 F)
1961
35.0 C (95.0 F)
1962
30.0 C (86.0 F)
1963
32.2 C (90.0 F)
1964
35.0 C (95.0 F)
1965
31.7 C (89.1 F)
1966
32.8 C (91.0 F)
1967
32.2 C (90.0 F)
1968
31.7 C (89.1 F)
1969
32.2 C (90.0 F)
1970
32.8 C (91.0 F)
1971
31.7 C (89.1 F)
1972
31.1 C (88.0 F)
1973
33.9 C (93.0 F)
1974
34.4 C (93.9 F)
1975
33.9 C (93.0 F)
1976
38.3 C (100.9 F)
1977
33.3 C (91.9 F)
1978
33.3 C (91.9 F)
1979
31.7 C (89.1 F)
1980
35.6 C (96.1 F)
1981
34.4 C (93.9 F)
1982
33.9 C (93.0 F)
1983
34.4 C (93.9 F)
1984
35.0 C (95.0 F)
1985
32.2 C (90.0 F)
1986
32.8 C (91.0 F)
1987
34.4 C (93.9 F)
1988
38.9 C (102.0 F)
1989
34.4 C (93.9 F)
1990
35.6 C (96.1 F)
1991
33.3 C (91.9 F)
1992
31.1 C (88.0 F)
1993
32.2 C (90.0 F)
1994
33.3 C (91.9 F)
1995
35.0 C (95.0 F)
1996
32.8 C (91.0 F)
1997
33.3 C (91.9 F)
1998
33.3 C (91.9 F)
1999
32.8 C (91.0 F)
2000
32.2 C (90.0 F)
2001
34.4 C (93.9 F)
2002
33.9 C (93.0 F)
2003
33.3 C (91.9 F)
2004
33.3 C (91.9 F)
2005
33.3 C (91.9 F)
2006
37.8 C (100.0 F)
2007
33.9 C (93.0 F)
2008
31.7 C (89.1 F)
2009
31.1 C (88.0 F)
2010
33.3 C (91.9 F)
2011
34.4 C (93.9 F)
2012
34.4 C (93.9 F)
2013
35.0 C (95.0 F)
2014
32.2 C (90.0 F)
2015
33.9 C (93.0 F)
2016
32.2 C (90.0 F)
2017
31.7 C (89.1 F)
2018
32.8 C (91.0 F)
2019
31.1 C (88.0 F)
2020
33.3 C (91.9 F)
2021
35.6 C (96.1 F)
2022
34.4 C (93.9 F)
2023
36.7 C (98.1 F)
2024
31.1 C (88.0 F)
2025
32.8 C (91.0 F)
2026
35.0 C (95.0 F)
Coldest night (TNn)
The coldest night of the year at Sandy Lake Dam Libby, 1893 to 2026. The record is -46.7 C (-52.1 F) in 1899, marked on the chart; the median year is -36.7 C (-34.1 F).
Coldest night (TNn) at Sandy Lake Dam Libby by year
Year
Coldest night (TNn)
1893
-40.6 C (-41.1 F)
1894
-31.7 C (-25.1 F)
1895
-45.0 C (-49.0 F)
1896
-40.6 C (-41.1 F)
1897
-39.4 C (-38.9 F)
1898
-42.8 C (-45.0 F)
1899
-46.7 C (-52.1 F)
1900
-33.9 C (-29.0 F)
1901
-39.4 C (-38.9 F)
1902
-40.0 C (-40.0 F)
1903
-40.6 C (-41.1 F)
1904
-41.1 C (-42.0 F)
1905
-37.2 C (-35.0 F)
1906
-41.1 C (-42.0 F)
1907
-42.8 C (-45.0 F)
1908
-37.2 C (-35.0 F)
1909
-38.3 C (-36.9 F)
1910
-40.0 C (-40.0 F)
1911
-40.0 C (-40.0 F)
1912
-43.9 C (-47.0 F)
1913
-37.2 C (-35.0 F)
1914
-40.6 C (-41.1 F)
1915
-40.6 C (-41.1 F)
1916
-40.0 C (-40.0 F)
1917
-40.0 C (-40.0 F)
1918
-36.7 C (-34.1 F)
1919
-36.7 C (-34.1 F)
1920
-35.6 C (-32.1 F)
1921
-36.7 C (-34.1 F)
1922
-42.8 C (-45.0 F)
1923
-38.3 C (-36.9 F)
1924
-40.0 C (-40.0 F)
1925
-34.4 C (-29.9 F)
1926
-36.1 C (-33.0 F)
1927
-42.8 C (-45.0 F)
1928
-35.6 C (-32.1 F)
1929
-36.7 C (-34.1 F)
1930
-39.4 C (-38.9 F)
1931
-31.1 C (-24.0 F)
1932
-32.2 C (-26.0 F)
1933
-43.3 C (-45.9 F)
1934
-35.0 C (-31.0 F)
1935
-42.2 C (-44.0 F)
1936
-41.1 C (-42.0 F)
1937
-41.7 C (-43.1 F)
1938
-40.0 C (-40.0 F)
1939
-45.0 C (-49.0 F)
1940
-36.7 C (-34.1 F)
1941
-31.7 C (-25.1 F)
1942
-37.2 C (-35.0 F)
1943
-35.0 C (-31.0 F)
1944
-32.2 C (-26.0 F)
1945
-34.4 C (-29.9 F)
1946
-42.8 C (-45.0 F)
1947
-31.7 C (-25.1 F)
1948
-41.7 C (-43.1 F)
1949
-37.2 C (-35.0 F)
1950
-43.3 C (-45.9 F)
1951
-40.0 C (-40.0 F)
1952
-37.8 C (-36.0 F)
1953
-36.7 C (-34.1 F)
1954
-40.0 C (-40.0 F)
1955
-37.8 C (-36.0 F)
1956
-33.3 C (-27.9 F)
1957
-34.4 C (-29.9 F)
1958
-35.6 C (-32.1 F)
1959
-37.8 C (-36.0 F)
1960
-33.3 C (-27.9 F)
1961
-34.4 C (-29.9 F)
1962
-40.0 C (-40.0 F)
1963
-37.8 C (-36.0 F)
1964
-31.1 C (-24.0 F)
1965
-40.6 C (-41.1 F)
1966
-38.9 C (-38.0 F)
1967
-40.0 C (-40.0 F)
1968
-38.3 C (-36.9 F)
1969
-32.8 C (-27.0 F)
1970
-38.3 C (-36.9 F)
1971
-35.6 C (-32.1 F)
1972
-45.0 C (-49.0 F)
1973
-36.7 C (-34.1 F)
1974
-35.6 C (-32.1 F)
1975
-31.7 C (-25.1 F)
1976
-36.1 C (-33.0 F)
1977
-41.1 C (-42.0 F)
1978
-36.7 C (-34.1 F)
1979
-38.9 C (-38.0 F)
1980
-33.9 C (-29.0 F)
1981
-36.1 C (-33.0 F)
1982
-40.6 C (-41.1 F)
1983
-40.0 C (-40.0 F)
1984
-35.6 C (-32.1 F)
1985
-35.6 C (-32.1 F)
1986
-33.3 C (-27.9 F)
1987
-37.2 C (-35.0 F)
1988
-37.2 C (-35.0 F)
1989
-36.7 C (-34.1 F)
1990
-32.8 C (-27.0 F)
1991
-32.2 C (-26.0 F)
1992
-32.2 C (-26.0 F)
1993
-36.1 C (-33.0 F)
1994
-38.3 C (-36.9 F)
1995
-31.1 C (-24.0 F)
1996
-42.2 C (-44.0 F)
1997
-37.2 C (-35.0 F)
1998
-30.6 C (-23.1 F)
1999
-30.6 C (-23.1 F)
2000
-30.6 C (-23.1 F)
2001
-31.1 C (-24.0 F)
2002
-25.6 C (-14.1 F)
2003
-31.7 C (-25.1 F)
2004
-36.1 C (-33.0 F)
2005
-40.0 C (-40.0 F)
2006
-27.8 C (-18.0 F)
2007
-33.9 C (-29.0 F)
2008
-33.3 C (-27.9 F)
2009
-36.7 C (-34.1 F)
2010
-34.4 C (-29.9 F)
2011
-31.1 C (-24.0 F)
2012
-28.9 C (-20.0 F)
2013
-34.4 C (-29.9 F)
2014
-36.1 C (-33.0 F)
2015
-32.2 C (-26.0 F)
2016
-31.1 C (-24.0 F)
2017
-34.4 C (-29.9 F)
2018
-33.9 C (-29.0 F)
2019
-40.6 C (-41.1 F)
2020
-30.6 C (-23.1 F)
2021
-37.2 C (-35.0 F)
2022
-35.6 C (-32.1 F)
2023
-32.2 C (-26.0 F)
2024
-28.3 C (-18.9 F)
2025
-33.3 C (-27.9 F)
2026
-35.0 C (-31.0 F)
Wettest day (Rx1day)
The wettest day of the year at Sandy Lake Dam Libby, 1893 to 2026. The record is 128.5 mm (5.1 in) in 2012, marked on the chart; the median year is 50.8 mm (2.0 in).
Wettest day (Rx1day) at Sandy Lake Dam Libby by year
Year
Wettest day (Rx1day)
1893
57.2 mm (2.3 in)
1894
75.2 mm (3.0 in)
1895
54.6 mm (2.1 in)
1896
49.8 mm (2.0 in)
1897
85.1 mm (3.4 in)
1898
27.2 mm (1.1 in)
1899
52.1 mm (2.1 in)
1900
47.0 mm (1.9 in)
1901
78.5 mm (3.1 in)
1902
62.2 mm (2.4 in)
1903
58.4 mm (2.3 in)
1904
33.0 mm (1.3 in)
1905
61.5 mm (2.4 in)
1906
40.9 mm (1.6 in)
1907
50.8 mm (2.0 in)
1908
78.7 mm (3.1 in)
1909
82.0 mm (3.2 in)
1910
54.6 mm (2.1 in)
1911
53.3 mm (2.1 in)
1912
32.0 mm (1.3 in)
1913
41.1 mm (1.6 in)
1914
72.1 mm (2.8 in)
1915
68.3 mm (2.7 in)
1916
49.5 mm (1.9 in)
1917
27.9 mm (1.1 in)
1918
40.6 mm (1.6 in)
1919
50.8 mm (2.0 in)
1920
52.1 mm (2.1 in)
1921
49.5 mm (1.9 in)
1922
63.5 mm (2.5 in)
1923
61.0 mm (2.4 in)
1924
53.3 mm (2.1 in)
1925
96.5 mm (3.8 in)
1926
40.6 mm (1.6 in)
1927
37.6 mm (1.5 in)
1928
56.9 mm (2.2 in)
1929
39.1 mm (1.5 in)
1930
46.2 mm (1.8 in)
1931
76.5 mm (3.0 in)
1932
29.0 mm (1.1 in)
1933
38.6 mm (1.5 in)
1934
50.8 mm (2.0 in)
1935
47.0 mm (1.9 in)
1936
26.2 mm (1.0 in)
1937
39.6 mm (1.6 in)
1938
51.1 mm (2.0 in)
1939
37.3 mm (1.5 in)
1940
41.9 mm (1.6 in)
1941
51.8 mm (2.0 in)
1942
79.0 mm (3.1 in)
1943
60.2 mm (2.4 in)
1944
54.4 mm (2.1 in)
1945
36.3 mm (1.4 in)
1946
65.0 mm (2.6 in)
1947
70.6 mm (2.8 in)
1948
33.0 mm (1.3 in)
1949
51.6 mm (2.0 in)
1950
41.1 mm (1.6 in)
1951
37.1 mm (1.5 in)
1952
66.3 mm (2.6 in)
1953
103.9 mm (4.1 in)
1954
64.8 mm (2.6 in)
1955
59.9 mm (2.4 in)
1956
38.1 mm (1.5 in)
1957
46.5 mm (1.8 in)
1958
40.6 mm (1.6 in)
1959
42.7 mm (1.7 in)
1960
41.7 mm (1.6 in)
1961
35.6 mm (1.4 in)
1962
52.6 mm (2.1 in)
1963
71.9 mm (2.8 in)
1964
59.2 mm (2.3 in)
1965
48.8 mm (1.9 in)
1966
52.1 mm (2.1 in)
1967
53.8 mm (2.1 in)
1968
31.2 mm (1.2 in)
1969
44.2 mm (1.7 in)
1970
38.6 mm (1.5 in)
1971
59.7 mm (2.4 in)
1972
118.1 mm (4.6 in)
1973
64.8 mm (2.6 in)
1974
58.7 mm (2.3 in)
1975
35.3 mm (1.4 in)
1976
35.6 mm (1.4 in)
1977
38.1 mm (1.5 in)
1978
99.6 mm (3.9 in)
1979
44.2 mm (1.7 in)
1980
33.5 mm (1.3 in)
1981
39.4 mm (1.6 in)
1982
37.1 mm (1.5 in)
1983
42.4 mm (1.7 in)
1984
52.6 mm (2.1 in)
1985
70.4 mm (2.8 in)
1986
107.7 mm (4.2 in)
1987
51.6 mm (2.0 in)
1988
30.0 mm (1.2 in)
1989
107.4 mm (4.2 in)
1990
102.4 mm (4.0 in)
1991
39.4 mm (1.6 in)
1992
43.4 mm (1.7 in)
1993
74.4 mm (2.9 in)
1994
58.4 mm (2.3 in)
1995
110.0 mm (4.3 in)
1996
41.9 mm (1.6 in)
1997
56.9 mm (2.2 in)
1998
41.9 mm (1.6 in)
1999
73.4 mm (2.9 in)
2000
82.6 mm (3.3 in)
2001
59.7 mm (2.4 in)
2002
77.5 mm (3.1 in)
2003
49.0 mm (1.9 in)
2004
53.8 mm (2.1 in)
2005
70.9 mm (2.8 in)
2006
33.5 mm (1.3 in)
2007
44.5 mm (1.8 in)
2008
40.4 mm (1.6 in)
2009
37.8 mm (1.5 in)
2010
67.1 mm (2.6 in)
2011
50.8 mm (2.0 in)
2012
128.5 mm (5.1 in)
2013
41.1 mm (1.6 in)
2014
47.8 mm (1.9 in)
2015
63.8 mm (2.5 in)
2016
47.8 mm (1.9 in)
2017
32.8 mm (1.3 in)
2018
48.5 mm (1.9 in)
2019
49.5 mm (1.9 in)
2020
77.5 mm (3.1 in)
2021
30.7 mm (1.2 in)
2022
37.1 mm (1.5 in)
2023
31.2 mm (1.2 in)
2024
38.6 mm (1.5 in)
2025
36.6 mm (1.4 in)
2026
47.5 mm (1.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Sandy Lake Dam Libby, 1893 to 2026. The record is 229.1 mm (9.0 in) in 1953, marked on the chart; the median year is 80.0 mm (3.1 in).
Wettest five days (Rx5day) at Sandy Lake Dam Libby by year
Year
Wettest five days (Rx5day)
1893
35.6 mm (1.4 in)
1894
119.3 mm (4.7 in)
1895
66.5 mm (2.6 in)
1896
88.9 mm (3.5 in)
1897
192.0 mm (7.6 in)
1898
61.3 mm (2.4 in)
1899
98.5 mm (3.9 in)
1900
87.8 mm (3.5 in)
1901
104.4 mm (4.1 in)
1902
117.1 mm (4.6 in)
1903
88.4 mm (3.5 in)
1904
55.2 mm (2.2 in)
1905
86.7 mm (3.4 in)
1906
97.0 mm (3.8 in)
1907
70.0 mm (2.8 in)
1908
107.9 mm (4.2 in)
1909
166.6 mm (6.6 in)
1910
80.2 mm (3.2 in)
1911
62.7 mm (2.5 in)
1912
58.6 mm (2.3 in)
1913
58.7 mm (2.3 in)
1914
87.1 mm (3.4 in)
1915
82.6 mm (3.3 in)
1916
66.0 mm (2.6 in)
1917
49.1 mm (1.9 in)
1918
49.2 mm (1.9 in)
1919
103.6 mm (4.1 in)
1920
96.6 mm (3.8 in)
1921
81.2 mm (3.2 in)
1922
63.5 mm (2.5 in)
1923
68.6 mm (2.7 in)
1924
77.4 mm (3.0 in)
1925
104.1 mm (4.1 in)
1926
55.7 mm (2.2 in)
1927
49.8 mm (2.0 in)
1928
84.0 mm (3.3 in)
1929
54.9 mm (2.2 in)
1930
68.8 mm (2.7 in)
1931
100.1 mm (3.9 in)
1932
47.7 mm (1.9 in)
1933
54.6 mm (2.1 in)
1934
61.1 mm (2.4 in)
1935
55.4 mm (2.2 in)
1936
47.5 mm (1.9 in)
1937
88.4 mm (3.5 in)
1938
86.2 mm (3.4 in)
1939
79.7 mm (3.1 in)
1940
66.4 mm (2.6 in)
1941
95.7 mm (3.8 in)
1942
102.3 mm (4.0 in)
1943
97.5 mm (3.8 in)
1944
158.8 mm (6.3 in)
1945
65.2 mm (2.6 in)
1946
76.2 mm (3.0 in)
1947
83.3 mm (3.3 in)
1948
55.6 mm (2.2 in)
1949
112.3 mm (4.4 in)
1950
62.3 mm (2.5 in)
1951
85.3 mm (3.4 in)
1952
139.2 mm (5.5 in)
1953
229.1 mm (9.0 in)
1954
84.6 mm (3.3 in)
1955
155.3 mm (6.1 in)
1956
54.1 mm (2.1 in)
1957
65.6 mm (2.6 in)
1958
65.5 mm (2.6 in)
1959
86.9 mm (3.4 in)
1960
69.8 mm (2.7 in)
1961
66.1 mm (2.6 in)
1962
76.4 mm (3.0 in)
1963
96.7 mm (3.8 in)
1964
95.5 mm (3.8 in)
1965
97.3 mm (3.8 in)
1966
80.3 mm (3.2 in)
1967
76.7 mm (3.0 in)
1968
84.1 mm (3.3 in)
1969
62.0 mm (2.4 in)
1970
91.7 mm (3.6 in)
1971
85.3 mm (3.4 in)
1972
121.7 mm (4.8 in)
1973
95.3 mm (3.8 in)
1974
96.3 mm (3.8 in)
1975
75.4 mm (3.0 in)
1976
52.4 mm (2.1 in)
1977
60.2 mm (2.4 in)
1978
127.0 mm (5.0 in)
1979
76.8 mm (3.0 in)
1980
60.7 mm (2.4 in)
1981
63.0 mm (2.5 in)
1982
68.6 mm (2.7 in)
1983
104.8 mm (4.1 in)
1984
107.7 mm (4.2 in)
1985
106.5 mm (4.2 in)
1986
147.5 mm (5.8 in)
1987
75.7 mm (3.0 in)
1988
61.4 mm (2.4 in)
1989
142.5 mm (5.6 in)
1990
114.1 mm (4.5 in)
1991
92.8 mm (3.7 in)
1992
102.1 mm (4.0 in)
1993
126.0 mm (5.0 in)
1994
88.4 mm (3.5 in)
1995
64.7 mm (2.5 in)
1996
79.5 mm (3.1 in)
1997
112.7 mm (4.4 in)
1998
63.3 mm (2.5 in)
1999
80.3 mm (3.2 in)
2000
51.3 mm (2.0 in)
2001
74.7 mm (2.9 in)
2002
91.2 mm (3.6 in)
2003
48.4 mm (1.9 in)
2004
40.6 mm (1.6 in)
2005
91.8 mm (3.6 in)
2006
59.5 mm (2.3 in)
2007
67.1 mm (2.6 in)
2008
57.0 mm (2.2 in)
2009
43.5 mm (1.7 in)
2010
49.6 mm (2.0 in)
2011
71.1 mm (2.8 in)
2012
195.1 mm (7.7 in)
2013
55.1 mm (2.2 in)
2014
68.6 mm (2.7 in)
2015
92.3 mm (3.6 in)
2016
123.5 mm (4.9 in)
2017
59.5 mm (2.3 in)
2018
89.8 mm (3.5 in)
2019
81.3 mm (3.2 in)
2020
85.9 mm (3.4 in)
2021
38.1 mm (1.5 in)
2022
16.2 mm (0.6 in)
2023
40.7 mm (1.6 in)
2024
62.2 mm (2.4 in)
2025
59.2 mm (2.3 in)
2026
89.9 mm (3.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Sandy Lake Dam Libby, 1893 to 2026. The record is 69 days in 1893, marked on the chart; the median year is 23 days.
Longest dry spell (CDD) at Sandy Lake Dam Libby by year
Year
Longest dry spell (CDD)
1893
69 days
1894
30 days
1895
36 days
1896
16 days
1897
17 days
1898
27 days
1899
30 days
1900
28 days
1901
30 days
1902
15 days
1903
23 days
1904
18 days
1905
28 days
1906
29 days
1907
34 days
1908
26 days
1909
23 days
1910
21 days
1911
39 days
1912
38 days
1913
27 days
1914
20 days
1915
20 days
1916
31 days
1917
31 days
1918
27 days
1919
26 days
1920
22 days
1921
21 days
1922
19 days
1923
30 days
1924
19 days
1925
29 days
1926
35 days
1927
20 days
1928
31 days
1929
25 days
1930
27 days
1931
21 days
1932
21 days
1933
32 days
1934
27 days
1935
25 days
1936
30 days
1937
21 days
1938
23 days
1939
44 days
1940
23 days
1941
36 days
1942
28 days
1943
23 days
1944
26 days
1945
17 days
1946
13 days
1947
21 days
1948
33 days
1949
22 days
1950
26 days
1951
17 days
1952
32 days
1953
23 days
1954
24 days
1955
15 days
1956
19 days
1957
19 days
1958
30 days
1959
30 days
1960
25 days
1961
30 days
1962
36 days
1963
31 days
1964
28 days
1965
18 days
1966
21 days
1967
19 days
1968
35 days
1969
25 days
1970
24 days
1971
14 days
1972
18 days
1973
21 days
1974
22 days
1975
19 days
1976
35 days
1977
20 days
1978
25 days
1979
18 days
1980
30 days
1981
25 days
1982
22 days
1983
23 days
1984
43 days
1985
18 days
1986
21 days
1987
35 days
1988
33 days
1989
27 days
1990
28 days
1991
28 days
1992
26 days
1993
19 days
1994
24 days
1995
17 days
1996
18 days
1997
19 days
1998
28 days
1999
15 days
2000
5 days
2001
12 days
2002
14 days
2003
8 days
2004
6 days
2005
17 days
2006
21 days
2007
18 days
2008
24 days
2009
20 days
2010
24 days
2011
18 days
2012
23 days
2013
18 days
2014
10 days
2015
9 days
2016
7 days
2017
11 days
2018
14 days
2019
9 days
2020
12 days
2021
18 days
2022
4 days
2023
13 days
2024
44 days
2025
17 days
2026
22 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
96 years with a frost
Across 96 years with a frost, the median last spring frost at Sandy Lake Dam Libby falls on 20 May and the median first autumn frost on 22 September, which leaves a median of 125 days between them.
In 1968 to 2025 the median growing season was 135 days. That is 16 days more than in 1898 to 1930.
Fitted over all years, the growing season changes by +2.5 days per decade at this station.
Frost dates and growing season at Sandy Lake Dam Libby
Measure
Median, all years
Earliest period (1898 to 1930)
Recent period (1968 to 2025)
Recent against earliest
Fitted trend
Last spring frost
20 May
25 May
14 May
11 days earlier
-1.3 days per decade
First autumn frost
22 September
20 September
24 September
4 days later
+1.2 days per decade
Growing days
125 days
119 days
135 days
16 days more
+2.5 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
94 years, 1894 to 2011
A day with at least 49.8 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 126.0 mm (5.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Sandy Lake Dam Libby: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
49.8 mm (2.0 in)
5 years
67.0 mm (2.6 in)
10 years
79.6 mm (3.1 in)
25 years
97.0 mm (3.8 in)
50 years
111.0 mm (4.4 in)
100 years
126.0 mm (5.0 in)
Longer than the 94 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, 94 years of values from 1894 to 2011.
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: 118.1 mm (4.6 in) in 1972; 107.7 mm (4.2 in) in 1986; 107.4 mm (4.2 in) in 1989.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Sandy Lake Dam Libby standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Sandy Lake Dam Libby 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.