Record envelope, standing records and threshold days for Gibson Dam (USC00243489), Montana, United States, with 116 years of record.
Key Facts for Gibson Dam
Gibson Dam (USC00243489) is a weather station in Montana, United States at 47.60 latitude and -112.75 longitude, 1,399 m (4,590 ft) above sea level.
The station reports from 1911 to 2026, 116 years of record.
1,464 records set at Gibson Dam still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Gibson Dam set a daily record high maximum temperature of 24.4 C (75.9 F) on 22 April 2026.
About the Station
Location: Montana, United States, 47.60 latitude, -112.75 longitude.
Elevation: 1,399 m (4,590 ft).
Period of record: 1911 to 2026, 116 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
2 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 Gibson Dam. The lines show the 2026 daily maximum and minimum. 2 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Gibson Dam, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
19.4 C (66.9 F)
-43.9 C (-47.0 F)
15.0 C (59.0 F)
-18.3 C (-0.9 F)
Feb
20.6 C (69.1 F)
-45.0 C (-49.0 F)
12.8 C (55.0 F)
-22.8 C (-9.0 F)
Mar
27.8 C (82.0 F)
-36.1 C (-33.0 F)
13.9 C (57.0 F)
-18.3 C (-0.9 F)
Apr
27.8 C (82.0 F)
-23.9 C (-11.0 F)
24.4 C (75.9 F)
-7.8 C (18.0 F)
May
32.2 C (90.0 F)
-18.3 C (-0.9 F)
27.2 C (81.0 F)
-3.9 C (25.0 F)
Jun
37.2 C (99.0 F)
-5.6 C (21.9 F)
25.6 C (78.1 F)
0.0 C (32.0 F)
Jul
41.1 C (106.0 F)
-2.2 C (28.0 F)
34.4 C (93.9 F)
5.6 C (42.1 F)
Aug
37.8 C (100.0 F)
-3.3 C (26.1 F)
34.4 C (93.9 F)
2.2 C (36.0 F)
Sep
35.6 C (96.1 F)
-13.3 C (8.1 F)
27.8 C (82.0 F)
-1.1 C (30.0 F)
Oct
32.2 C (90.0 F)
-25.0 C (-13.0 F)
26.1 C (79.0 F)
0.0 C (32.0 F)
Nov
24.4 C (75.9 F)
-37.2 C (-35.0 F)
n/a
n/a
Dec
20.0 C (68.0 F)
-42.2 C (-44.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Gibson Dam still stand. 1919 holds the most, with 53.
Standing records at Gibson Dam by the year they were set
Year set
Standing records
1911
6
1912
18
1913
17
1914
20
1915
18
1916
23
1917
31
1918
30
1919
53
1920
1
1921
12
1922
2
1923
17
1924
21
1926
23
1927
20
1928
29
1929
34
1930
34
1931
19
1932
17
1933
9
1934
16
1935
25
1936
49
1937
16
1938
4
1939
18
1940
12
1941
7
1942
10
1943
25
1944
8
1945
7
1946
8
1947
9
1948
6
1949
18
1950
25
1951
17
1952
10
1953
8
1954
14
1955
23
1956
10
1957
13
1958
5
1959
8
1960
7
1961
9
1962
13
1963
12
1964
4
1965
16
1966
5
1967
20
1968
17
1969
14
1970
10
1971
7
1972
18
1973
14
1974
3
1975
9
1976
6
1977
5
1978
7
1979
4
1980
12
1981
9
1982
3
1983
7
1984
11
1985
28
1986
15
1987
12
1988
6
1989
11
1990
13
1991
7
1992
15
1993
14
1994
6
1995
8
1996
15
1997
6
1998
16
1999
11
2000
8
2001
4
2002
17
2003
6
2004
7
2005
13
2006
7
2007
3
2008
4
2009
14
2010
5
2011
2
2012
4
2013
5
2014
9
2015
3
2016
5
2017
5
2018
3
2019
16
2020
14
2021
18
2022
17
2023
10
2024
6
2025
6
2026
3
All-Time Record Progression
3 new records
3 all-time records were set at Gibson Dam between 18 October 1949 and 8 June 1964. Each dot is a new record.
When Gibson Dam set new all-time records
Date
Kind
Detail
1949-10-18
Record daily snowfall
Record daily snowfall 45.7 cm (18.0 in)
1961-03-27
Record daily snowfall
Record daily snowfall 63.5 cm (25.0 in)
1964-06-08
Record daily precipitation
Record daily precipitation 179.6 mm (7.1 in)
Wettest Day of Each Month
Jun: 179.6 mm (7.1 in)
The wettest day on record for each calendar month at Gibson Dam. The most was 179.6 mm (7.1 in) on 8 June 1964.
Record daily precipitation for each month at Gibson Dam
Month
Record daily precipitation (mm)
Date
Jan
31.5 mm (1.2 in)
28 January 1959
Feb
24.1 mm (0.9 in)
18 February 2018
Mar
96.0 mm (3.8 in)
27 March 1961
Apr
77.2 mm (3.0 in)
30 April 1951
May
85.9 mm (3.4 in)
25 May 1962
Jun
179.6 mm (7.1 in)
8 June 1964
Jul
85.6 mm (3.4 in)
13 July 1989
Aug
102.6 mm (4.0 in)
30 August 1971
Sep
64.3 mm (2.5 in)
21 September 1940
Oct
45.7 mm (1.8 in)
18 October 1949
Nov
50.3 mm (2.0 in)
22 November 1915
Dec
30.5 mm (1.2 in)
22 December 1955
Period of Record Coverage
1911 to 2026
Complete yearUnder 90 percent of days
116 years of record at Gibson Dam, 1911 to 2026. 19 years have data for under 90 percent of days and are left out of rankings: 1911, 1912, 1913, 1919, 1920, 1921, 1922, 1925 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 87 complete years at Gibson Dam, 1914 to 2021. Blue stripes are years cooler than the station's own mean of 5.4 C (41.8 F); red stripes are warmer. The coolest year was 1951, at 3.3 C (37.9 F), and the warmest was 1928, at 8.1 C (46.5 F). The strongest colour marks a difference of 2.7 C (4.9 F).
Annual mean temperature at Gibson Dam as warming stripes, 1914 to 2021
Year
Annual mean temperature
Difference from the station mean
1914
7.4 C
+1.95 C
1916
3.5 C
-1.98 C
1917
4.9 C
-0.53 C
1918
6.5 C
+1.10 C
1923
6.1 C
+0.69 C
1927
5.9 C
+0.42 C
1928
8.1 C
+2.64 C
1929
5.6 C
+0.14 C
1930
5.8 C
+0.35 C
1931
6.9 C
+1.46 C
1932
5.1 C
-0.31 C
1933
5.7 C
+0.21 C
1934
7.2 C
+1.71 C
1935
5.0 C
-0.41 C
1936
5.3 C
-0.14 C
1937
4.6 C
-0.82 C
1938
5.5 C
+0.06 C
1939
6.7 C
+1.25 C
1940
6.3 C
+0.84 C
1941
6.0 C
+0.58 C
1942
4.9 C
-0.56 C
1943
4.9 C
-0.56 C
1944
5.5 C
+0.04 C
1946
5.8 C
+0.33 C
1947
5.9 C
+0.42 C
1949
4.9 C
-0.52 C
1950
4.1 C
-1.37 C
1951
3.3 C
-2.18 C
1952
5.8 C
+0.35 C
1953
6.7 C
+1.21 C
1955
3.9 C
-1.58 C
1956
5.2 C
-0.20 C
1957
4.8 C
-0.62 C
1958
6.0 C
+0.52 C
1959
5.0 C
-0.41 C
1960
5.3 C
-0.15 C
1962
5.7 C
+0.28 C
1963
6.1 C
+0.67 C
1964
5.2 C
-0.23 C
1965
5.1 C
-0.35 C
1966
5.9 C
+0.46 C
1967
5.5 C
+0.10 C
1968
5.4 C
-0.02 C
1969
5.0 C
-0.48 C
1971
5.1 C
-0.39 C
1972
4.7 C
-0.79 C
1973
5.8 C
+0.40 C
1974
6.4 C
+0.96 C
1975
4.3 C
-1.15 C
1976
6.4 C
+0.98 C
1977
5.6 C
+0.20 C
1978
4.7 C
-0.74 C
1979
5.5 C
+0.02 C
1980
5.8 C
+0.38 C
1981
6.7 C
+1.26 C
1982
4.6 C
-0.86 C
1983
5.9 C
+0.48 C
1984
5.9 C
+0.41 C
1985
4.5 C
-0.92 C
1986
6.6 C
+1.18 C
1987
7.2 C
+1.75 C
1988
7.1 C
+1.61 C
1989
5.3 C
-0.16 C
1990
6.0 C
+0.55 C
1991
6.3 C
+0.87 C
1992
6.3 C
+0.90 C
1993
4.2 C
-1.24 C
1994
5.7 C
+0.27 C
1995
5.0 C
-0.46 C
1996
3.4 C
-2.07 C
1997
5.2 C
-0.24 C
1998
5.2 C
-0.28 C
2000
5.1 C
-0.32 C
2001
5.3 C
-0.16 C
2002
4.1 C
-1.32 C
2003
5.8 C
+0.35 C
2004
5.7 C
+0.22 C
2006
5.7 C
+0.24 C
2007
6.0 C
+0.57 C
2009
4.4 C
-1.04 C
2010
4.3 C
-1.10 C
2011
4.1 C
-1.32 C
2013
5.0 C
-0.41 C
2017
4.7 C
-0.75 C
2019
3.3 C
-2.11 C
2020
5.6 C
+0.17 C
2021
5.5 C
+0.03 C
The annual mean temperature here has fallen by 0.08 C (0.01 to 0.14) per decade over 1914 to 2021. In Fahrenheit: 0.13 F (0.01 to 0.26) per decade. The slope is a straight line fitted to 87 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Gibson Dam
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.07 C (-0.14 to -0.01) per decade
-0.13 F (-0.26 to -0.01) per decade
1914 to 2021
87
Fall
Mean daily maximum
-0.09 C (-0.17 to -0.01) per decade
-0.17 F (-0.31 to -0.03) per decade
1914 to 2021
87
Fall
Mean daily minimum
-0.06 C (-0.12 to 0.01) per decade
-0.10 F (-0.22 to 0.02) per decade
1914 to 2021
87
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
1911 to 2026
Yearly extremes at Gibson Dam: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.1 C (106.0 F)
1929
33.3 C (91.9 F)
116
Coldest night (TNn)
-45.0 C (-49.0 F)
1936
-32.5 C (-26.5 F)
116
Wettest day (Rx1day)
179.6 mm (7.1 in)
1964
35.6 mm (1.4 in)
116
Wettest five days (Rx5day)
228.1 mm (9.0 in)
1916
59.4 mm (2.3 in)
116
Longest dry spell (CDD)
73 days
1969
29 days
116
Hottest day (TXx)
The hottest day of the year at Gibson Dam, 1911 to 2026. The record is 41.1 C (106.0 F) in 1929, marked on the chart; the median year is 33.3 C (91.9 F).
Hottest day (TXx) at Gibson Dam by year
Year
Hottest day (TXx)
1911
21.1 C (70.0 F)
1912
32.2 C (90.0 F)
1913
33.9 C (93.0 F)
1914
37.2 C (99.0 F)
1915
33.3 C (91.9 F)
1916
31.7 C (89.1 F)
1917
36.1 C (97.0 F)
1918
37.2 C (99.0 F)
1919
35.6 C (96.1 F)
1920
18.9 C (66.0 F)
1921
18.3 C (64.9 F)
1922
13.9 C (57.0 F)
1923
33.3 C (91.9 F)
1924
32.8 C (91.0 F)
1925
22.2 C (72.0 F)
1926
37.2 C (99.0 F)
1927
32.8 C (91.0 F)
1928
36.7 C (98.1 F)
1929
41.1 C (106.0 F)
1930
36.7 C (98.1 F)
1931
36.1 C (97.0 F)
1932
33.3 C (91.9 F)
1933
37.8 C (100.0 F)
1934
35.0 C (95.0 F)
1935
35.6 C (96.1 F)
1936
36.7 C (98.1 F)
1937
35.6 C (96.1 F)
1938
31.7 C (89.1 F)
1939
35.0 C (95.0 F)
1940
37.8 C (100.0 F)
1941
33.9 C (93.0 F)
1942
33.9 C (93.0 F)
1943
32.2 C (90.0 F)
1944
30.6 C (87.1 F)
1945
33.3 C (91.9 F)
1946
32.8 C (91.0 F)
1947
32.8 C (91.0 F)
1948
36.1 C (97.0 F)
1949
36.1 C (97.0 F)
1950
34.4 C (93.9 F)
1951
31.7 C (89.1 F)
1952
32.8 C (91.0 F)
1953
34.4 C (93.9 F)
1954
32.2 C (90.0 F)
1955
32.8 C (91.0 F)
1956
31.7 C (89.1 F)
1957
31.1 C (88.0 F)
1958
30.6 C (87.1 F)
1959
35.6 C (96.1 F)
1960
36.1 C (97.0 F)
1961
37.8 C (100.0 F)
1962
33.3 C (91.9 F)
1963
33.3 C (91.9 F)
1964
31.7 C (89.1 F)
1965
33.9 C (93.0 F)
1966
32.8 C (91.0 F)
1967
33.3 C (91.9 F)
1968
33.3 C (91.9 F)
1969
37.2 C (99.0 F)
1970
32.8 C (91.0 F)
1971
32.8 C (91.0 F)
1972
31.7 C (89.1 F)
1973
35.6 C (96.1 F)
1974
31.7 C (89.1 F)
1975
33.3 C (91.9 F)
1976
32.8 C (91.0 F)
1977
31.1 C (88.0 F)
1978
31.7 C (89.1 F)
1979
33.3 C (91.9 F)
1980
33.3 C (91.9 F)
1981
34.4 C (93.9 F)
1982
30.0 C (86.0 F)
1983
35.6 C (96.1 F)
1984
34.4 C (93.9 F)
1985
34.4 C (93.9 F)
1986
31.7 C (89.1 F)
1987
32.2 C (90.0 F)
1988
33.3 C (91.9 F)
1989
32.8 C (91.0 F)
1990
33.9 C (93.0 F)
1991
33.3 C (91.9 F)
1992
33.3 C (91.9 F)
1993
30.6 C (87.1 F)
1994
36.7 C (98.1 F)
1995
37.8 C (100.0 F)
1996
35.0 C (95.0 F)
1997
31.1 C (88.0 F)
1998
34.4 C (93.9 F)
1999
33.3 C (91.9 F)
2000
36.7 C (98.1 F)
2001
33.9 C (93.0 F)
2002
37.8 C (100.0 F)
2003
35.6 C (96.1 F)
2004
32.8 C (91.0 F)
2005
32.8 C (91.0 F)
2006
35.0 C (95.0 F)
2007
37.2 C (99.0 F)
2008
32.2 C (90.0 F)
2009
31.7 C (89.1 F)
2010
31.7 C (89.1 F)
2011
33.3 C (91.9 F)
2012
33.3 C (91.9 F)
2013
35.6 C (96.1 F)
2014
31.1 C (88.0 F)
2015
33.9 C (93.0 F)
2016
32.2 C (90.0 F)
2017
35.0 C (95.0 F)
2018
37.8 C (100.0 F)
2019
32.8 C (91.0 F)
2020
37.2 C (99.0 F)
2021
33.9 C (93.0 F)
2022
35.6 C (96.1 F)
2023
35.0 C (95.0 F)
2024
36.1 C (97.0 F)
2025
33.3 C (91.9 F)
2026
34.4 C (93.9 F)
Coldest night (TNn)
The coldest night of the year at Gibson Dam, 1911 to 2026. The record is -45.0 C (-49.0 F) in 1936, marked on the chart; the median year is -32.5 C (-26.5 F).
Coldest night (TNn) at Gibson Dam by year
Year
Coldest night (TNn)
1911
-34.4 C (-29.9 F)
1912
-32.8 C (-27.0 F)
1913
-32.8 C (-27.0 F)
1914
-33.9 C (-29.0 F)
1915
-24.4 C (-11.9 F)
1916
-43.9 C (-47.0 F)
1917
-39.4 C (-38.9 F)
1918
-34.4 C (-29.9 F)
1919
-37.2 C (-35.0 F)
1920
-31.7 C (-25.1 F)
1921
-28.3 C (-18.9 F)
1922
-31.7 C (-25.1 F)
1923
-42.2 C (-44.0 F)
1924
-37.2 C (-35.0 F)
1925
-25.6 C (-14.1 F)
1926
-31.1 C (-24.0 F)
1927
-38.3 C (-36.9 F)
1928
-31.1 C (-24.0 F)
1929
-40.0 C (-40.0 F)
1930
-39.4 C (-38.9 F)
1931
-30.6 C (-23.1 F)
1932
-37.2 C (-35.0 F)
1933
-36.7 C (-34.1 F)
1934
-28.9 C (-20.0 F)
1935
-38.3 C (-36.9 F)
1936
-45.0 C (-49.0 F)
1937
-37.2 C (-35.0 F)
1938
-32.2 C (-26.0 F)
1939
-37.8 C (-36.0 F)
1940
-30.0 C (-22.0 F)
1941
-28.9 C (-20.0 F)
1942
-32.8 C (-27.0 F)
1943
-40.0 C (-40.0 F)
1944
-26.7 C (-16.1 F)
1945
-31.7 C (-25.1 F)
1946
-26.7 C (-16.1 F)
1947
-30.0 C (-22.0 F)
1948
-30.0 C (-22.0 F)
1949
-35.0 C (-31.0 F)
1950
-37.8 C (-36.0 F)
1951
-35.0 C (-31.0 F)
1952
-31.7 C (-25.1 F)
1953
-22.8 C (-9.0 F)
1954
-35.6 C (-32.1 F)
1955
-33.3 C (-27.9 F)
1956
-33.3 C (-27.9 F)
1957
-41.1 C (-42.0 F)
1958
-24.4 C (-11.9 F)
1959
-36.7 C (-34.1 F)
1960
-32.8 C (-27.0 F)
1961
-29.4 C (-20.9 F)
1962
-35.0 C (-31.0 F)
1963
-32.2 C (-26.0 F)
1964
-36.7 C (-34.1 F)
1965
-30.6 C (-23.1 F)
1966
-27.2 C (-17.0 F)
1967
-27.8 C (-18.0 F)
1968
-36.7 C (-34.1 F)
1969
-34.4 C (-29.9 F)
1970
-37.2 C (-35.0 F)
1971
-31.7 C (-25.1 F)
1972
-36.7 C (-34.1 F)
1973
-30.0 C (-22.0 F)
1974
-31.1 C (-24.0 F)
1975
-30.0 C (-22.0 F)
1976
-32.2 C (-26.0 F)
1977
-32.2 C (-26.0 F)
1978
-36.7 C (-34.1 F)
1979
-28.9 C (-20.0 F)
1980
-33.9 C (-29.0 F)
1981
-33.9 C (-29.0 F)
1982
-33.3 C (-27.9 F)
1983
-39.4 C (-38.9 F)
1984
-28.9 C (-20.0 F)
1985
-33.3 C (-27.9 F)
1986
-26.1 C (-15.0 F)
1987
-22.8 C (-9.0 F)
1988
-26.7 C (-16.1 F)
1989
-39.4 C (-38.9 F)
1990
-37.8 C (-36.0 F)
1991
-28.3 C (-18.9 F)
1992
-35.0 C (-31.0 F)
1993
-32.2 C (-26.0 F)
1994
-33.9 C (-29.0 F)
1995
-28.9 C (-20.0 F)
1996
-34.4 C (-29.9 F)
1997
-31.7 C (-25.1 F)
1998
-34.4 C (-29.9 F)
1999
-23.3 C (-9.9 F)
2000
-28.3 C (-18.9 F)
2001
-25.0 C (-13.0 F)
2002
-33.3 C (-27.9 F)
2003
-28.3 C (-18.9 F)
2004
-32.2 C (-26.0 F)
2005
-35.0 C (-31.0 F)
2006
-36.7 C (-34.1 F)
2007
-26.1 C (-15.0 F)
2008
-30.6 C (-23.1 F)
2009
-32.8 C (-27.0 F)
2010
-27.2 C (-17.0 F)
2011
-31.7 C (-25.1 F)
2012
-28.9 C (-20.0 F)
2013
-34.4 C (-29.9 F)
2014
-34.4 C (-29.9 F)
2015
-22.8 C (-9.0 F)
2016
-32.2 C (-26.0 F)
2017
-31.7 C (-25.1 F)
2018
-30.6 C (-23.1 F)
2019
-35.6 C (-32.1 F)
2020
-25.6 C (-14.1 F)
2021
-36.7 C (-34.1 F)
2022
-39.4 C (-38.9 F)
2023
-31.1 C (-24.0 F)
2024
-38.9 C (-38.0 F)
2025
-30.6 C (-23.1 F)
2026
-22.8 C (-9.0 F)
Wettest day (Rx1day)
The wettest day of the year at Gibson Dam, 1911 to 2026. The record is 179.6 mm (7.1 in) in 1964, marked on the chart; the median year is 35.6 mm (1.4 in).
Wettest day (Rx1day) at Gibson Dam by year
Year
Wettest day (Rx1day)
1911
20.8 mm (0.8 in)
1912
40.1 mm (1.6 in)
1913
19.3 mm (0.8 in)
1914
30.5 mm (1.2 in)
1915
51.3 mm (2.0 in)
1916
124.5 mm (4.9 in)
1917
47.5 mm (1.9 in)
1918
44.5 mm (1.8 in)
1919
13.7 mm (0.5 in)
1920
15.2 mm (0.6 in)
1921
19.1 mm (0.8 in)
1922
10.7 mm (0.4 in)
1923
55.9 mm (2.2 in)
1924
24.4 mm (1.0 in)
1925
19.3 mm (0.8 in)
1926
25.1 mm (1.0 in)
1927
33.0 mm (1.3 in)
1928
30.7 mm (1.2 in)
1929
34.8 mm (1.4 in)
1930
45.7 mm (1.8 in)
1931
27.7 mm (1.1 in)
1932
29.2 mm (1.1 in)
1933
51.3 mm (2.0 in)
1934
62.5 mm (2.5 in)
1935
18.3 mm (0.7 in)
1936
26.2 mm (1.0 in)
1937
25.4 mm (1.0 in)
1938
52.6 mm (2.1 in)
1939
29.0 mm (1.1 in)
1940
64.3 mm (2.5 in)
1941
29.5 mm (1.2 in)
1942
36.1 mm (1.4 in)
1943
41.1 mm (1.6 in)
1944
40.4 mm (1.6 in)
1945
36.8 mm (1.4 in)
1946
32.5 mm (1.3 in)
1947
32.3 mm (1.3 in)
1948
61.0 mm (2.4 in)
1949
45.7 mm (1.8 in)
1950
50.5 mm (2.0 in)
1951
77.2 mm (3.0 in)
1952
38.1 mm (1.5 in)
1953
44.2 mm (1.7 in)
1954
26.7 mm (1.1 in)
1955
30.5 mm (1.2 in)
1956
43.2 mm (1.7 in)
1957
58.4 mm (2.3 in)
1958
39.6 mm (1.6 in)
1959
31.5 mm (1.2 in)
1960
22.6 mm (0.9 in)
1961
96.0 mm (3.8 in)
1962
85.9 mm (3.4 in)
1963
27.9 mm (1.1 in)
1964
179.6 mm (7.1 in)
1965
43.9 mm (1.7 in)
1966
23.9 mm (0.9 in)
1967
60.5 mm (2.4 in)
1968
40.4 mm (1.6 in)
1969
30.7 mm (1.2 in)
1970
38.9 mm (1.5 in)
1971
102.6 mm (4.0 in)
1972
34.8 mm (1.4 in)
1973
18.5 mm (0.7 in)
1974
30.0 mm (1.2 in)
1975
88.6 mm (3.5 in)
1976
24.9 mm (1.0 in)
1977
20.8 mm (0.8 in)
1978
33.8 mm (1.3 in)
1979
20.8 mm (0.8 in)
1980
37.3 mm (1.5 in)
1981
65.5 mm (2.6 in)
1982
34.3 mm (1.4 in)
1983
56.6 mm (2.2 in)
1984
54.1 mm (2.1 in)
1985
31.5 mm (1.2 in)
1986
52.1 mm (2.1 in)
1987
51.1 mm (2.0 in)
1988
19.8 mm (0.8 in)
1989
85.6 mm (3.4 in)
1990
46.7 mm (1.8 in)
1991
67.6 mm (2.7 in)
1992
20.1 mm (0.8 in)
1993
33.8 mm (1.3 in)
1994
30.5 mm (1.2 in)
1995
47.5 mm (1.9 in)
1996
37.1 mm (1.5 in)
1997
48.8 mm (1.9 in)
1998
21.3 mm (0.8 in)
1999
25.4 mm (1.0 in)
2000
43.9 mm (1.7 in)
2001
52.8 mm (2.1 in)
2002
21.6 mm (0.9 in)
2003
28.2 mm (1.1 in)
2004
20.8 mm (0.8 in)
2005
38.6 mm (1.5 in)
2006
39.4 mm (1.6 in)
2007
37.1 mm (1.5 in)
2008
23.1 mm (0.9 in)
2009
51.3 mm (2.0 in)
2010
26.2 mm (1.0 in)
2011
28.4 mm (1.1 in)
2012
58.9 mm (2.3 in)
2013
30.2 mm (1.2 in)
2014
23.6 mm (0.9 in)
2015
21.1 mm (0.8 in)
2016
35.6 mm (1.4 in)
2017
37.3 mm (1.5 in)
2018
107.4 mm (4.2 in)
2019
50.0 mm (2.0 in)
2020
35.6 mm (1.4 in)
2021
28.7 mm (1.1 in)
2022
17.0 mm (0.7 in)
2023
72.6 mm (2.9 in)
2024
56.4 mm (2.2 in)
2025
18.3 mm (0.7 in)
2026
34.0 mm (1.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Gibson Dam, 1911 to 2026. The record is 228.1 mm (9.0 in) in 1916, marked on the chart; the median year is 59.4 mm (2.3 in).
Wettest five days (Rx5day) at Gibson Dam by year
Year
Wettest five days (Rx5day)
1911
20.8 mm (0.8 in)
1912
70.9 mm (2.8 in)
1913
33.3 mm (1.3 in)
1914
60.5 mm (2.4 in)
1915
59.5 mm (2.3 in)
1916
228.1 mm (9.0 in)
1917
89.4 mm (3.5 in)
1918
49.0 mm (1.9 in)
1919
19.4 mm (0.8 in)
1920
35.8 mm (1.4 in)
1921
25.7 mm (1.0 in)
1922
21.9 mm (0.9 in)
1923
93.5 mm (3.7 in)
1924
48.0 mm (1.9 in)
1925
52.8 mm (2.1 in)
1926
48.0 mm (1.9 in)
1927
40.2 mm (1.6 in)
1928
58.9 mm (2.3 in)
1929
67.3 mm (2.6 in)
1930
29.7 mm (1.2 in)
1931
51.6 mm (2.0 in)
1932
63.0 mm (2.5 in)
1933
64.5 mm (2.5 in)
1934
121.4 mm (4.8 in)
1935
26.2 mm (1.0 in)
1936
46.2 mm (1.8 in)
1937
40.9 mm (1.6 in)
1938
89.9 mm (3.5 in)
1939
38.9 mm (1.5 in)
1940
85.4 mm (3.4 in)
1941
53.9 mm (2.1 in)
1942
87.7 mm (3.5 in)
1943
70.4 mm (2.8 in)
1944
64.8 mm (2.6 in)
1945
79.5 mm (3.1 in)
1946
49.2 mm (1.9 in)
1947
68.1 mm (2.7 in)
1948
101.9 mm (4.0 in)
1949
51.5 mm (2.0 in)
1950
67.3 mm (2.6 in)
1951
81.5 mm (3.2 in)
1952
62.6 mm (2.5 in)
1953
80.4 mm (3.2 in)
1954
41.5 mm (1.6 in)
1955
47.8 mm (1.9 in)
1956
51.5 mm (2.0 in)
1957
91.4 mm (3.6 in)
1958
99.9 mm (3.9 in)
1959
38.7 mm (1.5 in)
1960
35.3 mm (1.4 in)
1961
104.4 mm (4.1 in)
1962
133.6 mm (5.3 in)
1963
37.7 mm (1.5 in)
1964
223.8 mm (8.8 in)
1965
72.6 mm (2.9 in)
1966
36.1 mm (1.4 in)
1967
95.0 mm (3.7 in)
1968
57.9 mm (2.3 in)
1969
93.5 mm (3.7 in)
1970
98.3 mm (3.9 in)
1971
106.1 mm (4.2 in)
1972
48.5 mm (1.9 in)
1973
23.6 mm (0.9 in)
1974
66.6 mm (2.6 in)
1975
134.5 mm (5.3 in)
1976
41.2 mm (1.6 in)
1977
37.7 mm (1.5 in)
1978
50.2 mm (2.0 in)
1979
22.9 mm (0.9 in)
1980
96.1 mm (3.8 in)
1981
93.9 mm (3.7 in)
1982
47.3 mm (1.9 in)
1983
73.1 mm (2.9 in)
1984
68.0 mm (2.7 in)
1985
63.2 mm (2.5 in)
1986
75.1 mm (3.0 in)
1987
106.4 mm (4.2 in)
1988
27.2 mm (1.1 in)
1989
99.3 mm (3.9 in)
1990
66.5 mm (2.6 in)
1991
89.2 mm (3.5 in)
1992
37.9 mm (1.5 in)
1993
59.3 mm (2.3 in)
1994
68.9 mm (2.7 in)
1995
113.0 mm (4.4 in)
1996
65.8 mm (2.6 in)
1997
80.9 mm (3.2 in)
1998
77.7 mm (3.1 in)
1999
39.9 mm (1.6 in)
2000
60.9 mm (2.4 in)
2001
76.5 mm (3.0 in)
2002
54.7 mm (2.2 in)
2003
47.8 mm (1.9 in)
2004
34.3 mm (1.4 in)
2005
57.2 mm (2.3 in)
2006
74.2 mm (2.9 in)
2007
48.3 mm (1.9 in)
2008
37.4 mm (1.5 in)
2009
51.3 mm (2.0 in)
2010
58.1 mm (2.3 in)
2011
61.7 mm (2.4 in)
2012
55.9 mm (2.2 in)
2013
30.3 mm (1.2 in)
2014
45.4 mm (1.8 in)
2015
39.8 mm (1.6 in)
2016
48.3 mm (1.9 in)
2017
64.0 mm (2.5 in)
2018
191.5 mm (7.5 in)
2019
103.6 mm (4.1 in)
2020
53.6 mm (2.1 in)
2021
39.4 mm (1.6 in)
2022
42.1 mm (1.7 in)
2023
105.1 mm (4.1 in)
2024
22.7 mm (0.9 in)
2025
20.8 mm (0.8 in)
2026
60.1 mm (2.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Gibson Dam, 1911 to 2026. The record is 73 days in 1969, marked on the chart; the median year is 29 days.
Longest dry spell (CDD) at Gibson Dam by year
Year
Longest dry spell (CDD)
1911
27 days
1912
26 days
1913
36 days
1914
68 days
1915
28 days
1916
26 days
1917
29 days
1918
29 days
1919
26 days
1920
29 days
1921
28 days
1922
18 days
1923
33 days
1924
30 days
1925
20 days
1926
40 days
1927
30 days
1928
31 days
1929
35 days
1930
47 days
1931
62 days
1932
47 days
1933
24 days
1934
27 days
1935
43 days
1936
27 days
1937
26 days
1938
20 days
1939
31 days
1940
24 days
1941
42 days
1942
31 days
1943
23 days
1944
32 days
1945
28 days
1946
32 days
1947
16 days
1948
42 days
1949
26 days
1950
26 days
1951
17 days
1952
40 days
1953
48 days
1954
30 days
1955
45 days
1956
22 days
1957
15 days
1958
19 days
1959
44 days
1960
42 days
1961
29 days
1962
25 days
1963
33 days
1964
26 days
1965
50 days
1966
30 days
1967
33 days
1968
32 days
1969
73 days
1970
37 days
1971
30 days
1972
27 days
1973
36 days
1974
21 days
1975
20 days
1976
36 days
1977
34 days
1978
19 days
1979
36 days
1980
24 days
1981
25 days
1982
24 days
1983
39 days
1984
37 days
1985
26 days
1986
26 days
1987
26 days
1988
25 days
1989
18 days
1990
26 days
1991
22 days
1992
40 days
1993
23 days
1994
27 days
1995
31 days
1996
29 days
1997
35 days
1998
34 days
1999
17 days
2000
47 days
2001
40 days
2002
26 days
2003
33 days
2004
39 days
2005
24 days
2006
33 days
2007
34 days
2008
26 days
2009
46 days
2010
33 days
2011
1 day
2012
18 days
2013
28 days
2014
16 days
2015
39 days
2016
33 days
2017
44 days
2018
34 days
2019
22 days
2020
20 days
2021
21 days
2022
15 days
2023
17 days
2024
21 days
2025
14 days
2026
16 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
87 years with a frost
Across 87 years with a frost, the median last spring frost at Gibson Dam falls on 7 June and the median first autumn frost on 10 September, which leaves a median of 95 days between them.
In 1984 to 2021 the median growing season was 99 days. That is 8 days more than in 1914 to 1953.
Fitted over all years, the growing season changes by +0.9 days per decade at this station.
Frost dates and growing season at Gibson Dam
Measure
Median, all years
Earliest period (1914 to 1953)
Recent period (1984 to 2021)
Recent against earliest
Fitted trend
Last spring frost
7 June
9 June
5 June
4 days earlier
-0.3 days per decade
First autumn frost
10 September
9 September
11 September
2 days later
+0.5 days per decade
Growing days
95 days
91 days
99 days
8 days more
+0.9 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
90 years, 1912 to 2019
A day with at least 37.9 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 146.6 mm (5.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Gibson Dam: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
37.9 mm (1.5 in)
5 years
56.5 mm (2.2 in)
10 years
72.2 mm (2.8 in)
25 years
96.9 mm (3.8 in)
50 years
119.6 mm (4.7 in)
100 years
146.6 mm (5.8 in)
Longer than the 90 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, 90 years of values from 1912 to 2019.
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: 179.6 mm (7.1 in) in 1964; 124.5 mm (4.9 in) in 1916; 107.4 mm (4.2 in) in 2018.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Gibson Dam, at 1946. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1946 ran 0.4 C (0.8 F) higher than in the years before (possible change).
Suspected changes in the annual mean temperature at Gibson Dam, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1946
+0.4
+0.8
possible
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 Gibson Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Gibson Dam 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 2026-10-12 (12 October 2026). Records are computed by this site and are not official.