Record envelope, standing records and threshold days for Cottage Grove Dam (USC00351902), Oregon, United States, with 84 years of record.
Key Facts for Cottage Grove Dam
Cottage Grove Dam (USC00351902) is a weather station in Oregon, United States at 43.72 latitude and -123.06 longitude, 253 m (831 ft) above sea level.
The station reports from 1943 to 2026, 84 years of record.
1,464 records set at Cottage Grove Dam still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Cottage Grove Dam set a daily record high maximum temperature of 35.0 C (95.0 F) on 6 August 2026.
About the Station
Location: Oregon, United States, 43.72 latitude, -123.06 longitude.
Elevation: 253 m (831 ft).
Period of record: 1943 to 2026, 84 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
14 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 Cottage Grove Dam. The lines show the 2026 daily maximum and minimum. 14 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Cottage Grove Dam, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
21.7 C (71.1 F)
-16.1 C (3.0 F)
18.9 C (66.0 F)
-7.2 C (19.0 F)
Feb
23.3 C (73.9 F)
-17.2 C (1.0 F)
18.9 C (66.0 F)
-1.7 C (28.9 F)
Mar
27.2 C (81.0 F)
-7.2 C (19.0 F)
26.1 C (79.0 F)
0.0 C (32.0 F)
Apr
31.1 C (88.0 F)
-4.4 C (24.1 F)
27.2 C (81.0 F)
-0.6 C (30.9 F)
May
37.8 C (100.0 F)
-2.2 C (28.0 F)
31.1 C (88.0 F)
3.3 C (37.9 F)
Jun
37.8 C (100.0 F)
2.2 C (36.0 F)
35.6 C (96.1 F)
4.4 C (39.9 F)
Jul
41.1 C (106.0 F)
3.3 C (37.9 F)
39.4 C (102.9 F)
8.9 C (48.0 F)
Aug
40.6 C (105.1 F)
3.9 C (39.0 F)
35.0 C (95.0 F)
7.2 C (45.0 F)
Sep
38.9 C (102.0 F)
-1.7 C (28.9 F)
n/a
n/a
Oct
34.4 C (93.9 F)
-7.2 C (19.0 F)
n/a
n/a
Nov
24.4 C (75.9 F)
-11.1 C (12.0 F)
n/a
n/a
Dec
21.1 C (70.0 F)
-18.9 C (-2.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Cottage Grove Dam still stand. 1989 holds the most, with 45.
Standing records at Cottage Grove Dam by the year they were set
Year set
Standing records
1943
3
1944
17
1945
18
1946
25
1947
21
1948
20
1949
36
1950
33
1951
25
1952
23
1953
21
1954
22
1955
29
1956
24
1957
23
1958
21
1959
9
1960
17
1961
19
1962
28
1963
18
1964
25
1965
17
1966
13
1967
9
1968
18
1969
7
1970
23
1971
19
1972
37
1973
20
1974
29
1975
22
1976
19
1977
9
1978
20
1979
17
1980
18
1981
11
1982
14
1983
11
1984
13
1985
32
1986
15
1987
21
1988
10
1989
45
1990
19
1991
18
1992
12
1993
12
1994
9
1995
19
1996
17
1997
10
1998
6
1999
9
2000
3
2001
3
2002
15
2003
19
2004
3
2005
14
2006
6
2007
6
2008
13
2009
9
2010
18
2011
11
2012
10
2013
13
2014
13
2015
20
2016
18
2017
18
2018
13
2019
20
2020
14
2021
19
2022
31
2023
17
2024
17
2025
28
2026
16
All-Time Record Progression
4 new records
4 all-time records were set at Cottage Grove Dam between 4 February 1989 and 22 July 2026. Each dot is a new record.
When Cottage Grove Dam set new all-time records
Date
Kind
Detail
1989-02-04
Record low maximum temperature
Record low maximum temperature -8.9 C (16.0 F)
1996-11-19
Record daily precipitation
Record daily precipitation 145.3 mm (5.7 in)
2015-06-27
Record high minimum temperature
Record high minimum temperature 19.4 C (66.9 F)
2026-07-22
Record high minimum temperature
Record high minimum temperature 20.6 C (69.1 F)
Wettest Day of Each Month
Nov: 145.3 mm (5.7 in)
The wettest day on record for each calendar month at Cottage Grove Dam. The most was 145.3 mm (5.7 in) on 19 November 1996.
Record daily precipitation for each month at Cottage Grove Dam
Month
Record daily precipitation (mm)
Date
Jan
85.1 mm (3.4 in)
8 January 1976
Feb
120.4 mm (4.7 in)
10 February 1961
Mar
56.1 mm (2.2 in)
30 March 1963
Apr
63.2 mm (2.5 in)
10 April 1992
May
62.5 mm (2.5 in)
17 May 1991
Jun
35.1 mm (1.4 in)
15 June 1995
Jul
53.6 mm (2.1 in)
19 July 1987
Aug
60.5 mm (2.4 in)
26 August 1968
Sep
57.2 mm (2.3 in)
27 September 1981
Oct
105.4 mm (4.1 in)
29 October 1950
Nov
145.3 mm (5.7 in)
19 November 1996
Dec
120.9 mm (4.8 in)
6 December 1981
Period of Record Coverage
1943 to 2026
Complete yearUnder 90 percent of days
84 years of record at Cottage Grove Dam, 1943 to 2026. 9 years have data for under 90 percent of days and are left out of rankings: 1943, 2002, 2003, 2004, 2005, 2006, 2008, 2016 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 75 complete years at Cottage Grove Dam, 1944 to 2025. Blue stripes are years cooler than the station's own mean of 11.0 C (51.8 F); red stripes are warmer. The coolest year was 1989, at 8.9 C (48.0 F), and the warmest was 2025, at 12.6 C (54.6 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Cottage Grove Dam as warming stripes, 1944 to 2025
Year
Annual mean temperature
Difference from the station mean
1944
11.1 C
+0.03 C
1945
10.9 C
-0.10 C
1946
10.5 C
-0.49 C
1947
11.5 C
+0.43 C
1948
10.1 C
-0.97 C
1949
10.5 C
-0.50 C
1950
10.9 C
-0.17 C
1951
11.1 C
+0.11 C
1952
10.8 C
-0.19 C
1953
11.3 C
+0.26 C
1954
10.6 C
-0.43 C
1955
10.1 C
-0.94 C
1956
10.7 C
-0.33 C
1957
10.9 C
-0.17 C
1958
12.4 C
+1.38 C
1959
11.1 C
+0.11 C
1960
10.9 C
-0.12 C
1961
11.2 C
+0.19 C
1962
10.8 C
-0.25 C
1963
10.8 C
-0.27 C
1964
10.1 C
-0.97 C
1965
10.8 C
-0.19 C
1966
10.9 C
-0.14 C
1967
11.3 C
+0.31 C
1968
11.1 C
+0.05 C
1969
10.5 C
-0.49 C
1970
10.8 C
-0.23 C
1971
10.1 C
-0.97 C
1972
10.7 C
-0.32 C
1973
10.9 C
-0.11 C
1974
10.8 C
-0.25 C
1975
10.4 C
-0.67 C
1976
10.5 C
-0.54 C
1977
11.3 C
+0.23 C
1978
11.1 C
+0.10 C
1979
11.3 C
+0.32 C
1980
11.0 C
+0.02 C
1981
11.4 C
+0.40 C
1982
10.4 C
-0.59 C
1983
11.0 C
-0.06 C
1984
10.5 C
-0.56 C
1985
9.8 C
-1.23 C
1986
11.1 C
+0.08 C
1987
11.1 C
+0.11 C
1988
10.2 C
-0.85 C
1989
8.9 C
-2.13 C
1990
10.9 C
-0.16 C
1991
10.9 C
-0.08 C
1992
12.1 C
+1.10 C
1993
10.4 C
-0.64 C
1994
11.1 C
+0.11 C
1995
11.6 C
+0.62 C
1996
11.2 C
+0.21 C
1997
11.2 C
+0.21 C
1998
11.3 C
+0.27 C
1999
10.7 C
-0.36 C
2000
10.7 C
-0.33 C
2001
10.8 C
-0.18 C
2002
10.9 C
-0.17 C
2003
11.8 C
+0.81 C
2004
11.7 C
+0.66 C
2010
11.3 C
+0.26 C
2011
10.5 C
-0.51 C
2012
11.0 C
-0.03 C
2013
11.1 C
+0.03 C
2014
12.3 C
+1.29 C
2017
11.8 C
+0.77 C
2018
11.6 C
+0.61 C
2019
11.2 C
+0.14 C
2020
11.7 C
+0.72 C
2021
11.8 C
+0.78 C
2022
11.8 C
+0.77 C
2023
12.0 C
+1.00 C
2024
12.5 C
+1.46 C
2025
12.6 C
+1.53 C
The annual mean temperature here has risen by 0.1 C (0.1 to 0.2) per decade over 1944 to 2025. In Fahrenheit: 0.2 F (0.1 to 0.3) per decade. The slope is a straight line fitted to 75 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Cottage Grove Dam
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
1944 to 2025
75
Rise
Mean daily maximum
0.2 C (0.1 to 0.2) per decade
0.3 F (0.2 to 0.4) per decade
1944 to 2025
75
Rise
Mean daily minimum
0.07 C (0.01 to 0.13) per decade
0.12 F (0.02 to 0.23) per decade
1944 to 2025
75
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
1943 to 2026
Yearly extremes at Cottage Grove 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)
1946
36.1 C (97.0 F)
84
Coldest night (TNn)
-18.9 C (-2.0 F)
1972
-7.8 C (18.0 F)
84
Wettest day (Rx1day)
145.3 mm (5.7 in)
1996
57.2 mm (2.3 in)
84
Wettest five days (Rx5day)
239.8 mm (9.4 in)
1961
113.9 mm (4.5 in)
84
Longest dry spell (CDD)
96 days
1951
43 days
84
Hottest day (TXx)
The hottest day of the year at Cottage Grove Dam, 1943 to 2026. The record is 41.1 C (106.0 F) in 1946, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Cottage Grove Dam by year
Year
Hottest day (TXx)
1943
35.6 C (96.1 F)
1944
38.9 C (102.0 F)
1945
35.6 C (96.1 F)
1946
41.1 C (106.0 F)
1947
32.2 C (90.0 F)
1948
36.7 C (98.1 F)
1949
36.7 C (98.1 F)
1950
36.7 C (98.1 F)
1951
37.8 C (100.0 F)
1952
37.2 C (99.0 F)
1953
34.4 C (93.9 F)
1954
28.9 C (84.0 F)
1955
37.8 C (100.0 F)
1956
36.7 C (98.1 F)
1957
34.4 C (93.9 F)
1958
39.4 C (102.9 F)
1959
36.1 C (97.0 F)
1960
37.2 C (99.0 F)
1961
40.0 C (104.0 F)
1962
34.4 C (93.9 F)
1963
34.4 C (93.9 F)
1964
33.3 C (91.9 F)
1965
35.6 C (96.1 F)
1966
35.0 C (95.0 F)
1967
37.2 C (99.0 F)
1968
35.0 C (95.0 F)
1969
32.2 C (90.0 F)
1970
36.1 C (97.0 F)
1971
35.6 C (96.1 F)
1972
38.9 C (102.0 F)
1973
35.0 C (95.0 F)
1974
35.6 C (96.1 F)
1975
33.3 C (91.9 F)
1976
32.2 C (90.0 F)
1977
38.3 C (100.9 F)
1978
40.0 C (104.0 F)
1979
38.3 C (100.9 F)
1980
35.6 C (96.1 F)
1981
40.6 C (105.1 F)
1982
35.6 C (96.1 F)
1983
34.4 C (93.9 F)
1984
34.4 C (93.9 F)
1985
36.1 C (97.0 F)
1986
34.4 C (93.9 F)
1987
37.8 C (100.0 F)
1988
37.2 C (99.0 F)
1989
32.8 C (91.0 F)
1990
36.1 C (97.0 F)
1991
36.1 C (97.0 F)
1992
37.2 C (99.0 F)
1993
34.4 C (93.9 F)
1994
36.1 C (97.0 F)
1995
33.9 C (93.0 F)
1996
37.8 C (100.0 F)
1997
33.9 C (93.0 F)
1998
38.3 C (100.9 F)
1999
33.9 C (93.0 F)
2000
33.3 C (91.9 F)
2001
35.6 C (96.1 F)
2002
38.9 C (102.0 F)
2003
37.2 C (99.0 F)
2004
36.7 C (98.1 F)
2005
34.4 C (93.9 F)
2006
37.8 C (100.0 F)
2007
35.6 C (96.1 F)
2008
37.8 C (100.0 F)
2009
39.4 C (102.9 F)
2010
35.6 C (96.1 F)
2011
32.8 C (91.0 F)
2012
36.1 C (97.0 F)
2013
33.3 C (91.9 F)
2014
37.8 C (100.0 F)
2015
37.8 C (100.0 F)
2016
37.8 C (100.0 F)
2017
38.9 C (102.0 F)
2018
35.6 C (96.1 F)
2019
36.7 C (98.1 F)
2020
38.3 C (100.9 F)
2021
38.9 C (102.0 F)
2022
36.7 C (98.1 F)
2023
40.0 C (104.0 F)
2024
38.3 C (100.9 F)
2025
39.4 C (102.9 F)
2026
39.4 C (102.9 F)
Coldest night (TNn)
The coldest night of the year at Cottage Grove Dam, 1943 to 2026. The record is -18.9 C (-2.0 F) in 1972, marked on the chart; the median year is -7.8 C (18.0 F).
Coldest night (TNn) at Cottage Grove Dam by year
Year
Coldest night (TNn)
1943
-3.3 C (26.1 F)
1944
-5.6 C (21.9 F)
1945
-6.7 C (19.9 F)
1946
-4.4 C (24.1 F)
1947
-7.8 C (18.0 F)
1948
-8.3 C (17.1 F)
1949
-14.4 C (6.1 F)
1950
-15.0 C (5.0 F)
1951
-12.2 C (10.0 F)
1952
-7.8 C (18.0 F)
1953
-3.3 C (26.1 F)
1954
-5.0 C (23.0 F)
1955
-11.1 C (12.0 F)
1956
-11.7 C (10.9 F)
1957
-15.0 C (5.0 F)
1958
-3.9 C (25.0 F)
1959
-6.1 C (21.0 F)
1960
-7.8 C (18.0 F)
1961
-7.8 C (18.0 F)
1962
-16.1 C (3.0 F)
1963
-14.4 C (6.1 F)
1964
-12.8 C (9.0 F)
1965
-7.8 C (18.0 F)
1966
-3.9 C (25.0 F)
1967
-9.4 C (15.1 F)
1968
-7.8 C (18.0 F)
1969
-7.8 C (18.0 F)
1970
-5.6 C (21.9 F)
1971
-7.8 C (18.0 F)
1972
-18.9 C (-2.0 F)
1973
-5.0 C (23.0 F)
1974
-13.3 C (8.1 F)
1975
-3.9 C (25.0 F)
1976
-6.7 C (19.9 F)
1977
-8.3 C (17.1 F)
1978
-10.0 C (14.0 F)
1979
-12.2 C (10.0 F)
1980
-13.9 C (7.0 F)
1981
-4.4 C (24.1 F)
1982
-7.8 C (18.0 F)
1983
-15.0 C (5.0 F)
1984
-7.8 C (18.0 F)
1985
-8.9 C (16.0 F)
1986
-3.9 C (25.0 F)
1987
-7.2 C (19.0 F)
1988
-7.2 C (19.0 F)
1989
-17.2 C (1.0 F)
1990
-17.2 C (1.0 F)
1991
-7.2 C (19.0 F)
1992
-3.9 C (25.0 F)
1993
-7.2 C (19.0 F)
1994
-7.2 C (19.0 F)
1995
-5.0 C (23.0 F)
1996
-9.4 C (15.1 F)
1997
-7.8 C (18.0 F)
1998
-13.3 C (8.1 F)
1999
-5.6 C (21.9 F)
2000
-4.4 C (24.1 F)
2001
-3.9 C (25.0 F)
2002
-7.2 C (19.0 F)
2003
-5.6 C (21.9 F)
2004
-5.6 C (21.9 F)
2005
-6.7 C (19.9 F)
2006
-7.8 C (18.0 F)
2007
-5.0 C (23.0 F)
2008
-10.6 C (12.9 F)
2009
-13.3 C (8.1 F)
2010
-4.4 C (24.1 F)
2011
-8.3 C (17.1 F)
2012
-3.9 C (25.0 F)
2013
-16.1 C (3.0 F)
2014
-7.2 C (19.0 F)
2015
-7.2 C (19.0 F)
2016
-6.7 C (19.9 F)
2017
-11.1 C (12.0 F)
2018
-5.0 C (23.0 F)
2019
-7.2 C (19.0 F)
2020
-5.6 C (21.9 F)
2021
-4.4 C (24.1 F)
2022
-7.8 C (18.0 F)
2023
-8.3 C (17.1 F)
2024
-4.4 C (24.1 F)
2025
-7.8 C (18.0 F)
2026
-7.2 C (19.0 F)
Wettest day (Rx1day)
The wettest day of the year at Cottage Grove Dam, 1943 to 2026. The record is 145.3 mm (5.7 in) in 1996, marked on the chart; the median year is 57.2 mm (2.3 in).
Wettest day (Rx1day) at Cottage Grove Dam by year
Year
Wettest day (Rx1day)
1943
49.0 mm (1.9 in)
1944
26.2 mm (1.0 in)
1945
62.7 mm (2.5 in)
1946
62.2 mm (2.4 in)
1947
100.1 mm (3.9 in)
1948
63.0 mm (2.5 in)
1949
34.3 mm (1.4 in)
1950
105.4 mm (4.1 in)
1951
57.2 mm (2.3 in)
1952
41.1 mm (1.6 in)
1953
86.6 mm (3.4 in)
1954
41.4 mm (1.6 in)
1955
78.2 mm (3.1 in)
1956
66.5 mm (2.6 in)
1957
53.8 mm (2.1 in)
1958
61.5 mm (2.4 in)
1959
62.5 mm (2.5 in)
1960
77.2 mm (3.0 in)
1961
123.2 mm (4.9 in)
1962
55.6 mm (2.2 in)
1963
56.6 mm (2.2 in)
1964
79.2 mm (3.1 in)
1965
51.8 mm (2.0 in)
1966
67.1 mm (2.6 in)
1967
33.3 mm (1.3 in)
1968
60.5 mm (2.4 in)
1969
78.0 mm (3.1 in)
1970
47.2 mm (1.9 in)
1971
43.9 mm (1.7 in)
1972
59.2 mm (2.3 in)
1973
61.0 mm (2.4 in)
1974
63.0 mm (2.5 in)
1975
43.4 mm (1.7 in)
1976
85.1 mm (3.4 in)
1977
52.1 mm (2.1 in)
1978
46.5 mm (1.8 in)
1979
49.3 mm (1.9 in)
1980
78.7 mm (3.1 in)
1981
120.9 mm (4.8 in)
1982
68.6 mm (2.7 in)
1983
62.5 mm (2.5 in)
1984
93.2 mm (3.7 in)
1985
31.0 mm (1.2 in)
1986
50.3 mm (2.0 in)
1987
53.6 mm (2.1 in)
1988
63.5 mm (2.5 in)
1989
53.8 mm (2.1 in)
1990
50.3 mm (2.0 in)
1991
62.5 mm (2.5 in)
1992
63.2 mm (2.5 in)
1993
35.8 mm (1.4 in)
1994
48.3 mm (1.9 in)
1995
65.5 mm (2.6 in)
1996
145.3 mm (5.7 in)
1997
47.0 mm (1.9 in)
1998
100.8 mm (4.0 in)
1999
45.0 mm (1.8 in)
2000
56.6 mm (2.2 in)
2001
61.0 mm (2.4 in)
2002
89.2 mm (3.5 in)
2003
63.5 mm (2.5 in)
2004
63.5 mm (2.5 in)
2005
37.3 mm (1.5 in)
2006
60.2 mm (2.4 in)
2007
69.1 mm (2.7 in)
2008
51.3 mm (2.0 in)
2009
34.3 mm (1.4 in)
2010
33.5 mm (1.3 in)
2011
49.0 mm (1.9 in)
2012
54.9 mm (2.2 in)
2013
36.8 mm (1.4 in)
2014
50.8 mm (2.0 in)
2015
88.9 mm (3.5 in)
2016
58.4 mm (2.3 in)
2017
45.7 mm (1.8 in)
2018
40.1 mm (1.6 in)
2019
61.0 mm (2.4 in)
2020
57.7 mm (2.3 in)
2021
50.8 mm (2.0 in)
2022
55.9 mm (2.2 in)
2023
53.3 mm (2.1 in)
2024
55.9 mm (2.2 in)
2025
57.2 mm (2.3 in)
2026
50.8 mm (2.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Cottage Grove Dam, 1943 to 2026. The record is 239.8 mm (9.4 in) in 1961, marked on the chart; the median year is 113.9 mm (4.5 in).
Wettest five days (Rx5day) at Cottage Grove Dam by year
Year
Wettest five days (Rx5day)
1943
96.6 mm (3.8 in)
1944
64.1 mm (2.5 in)
1945
136.1 mm (5.4 in)
1946
115.6 mm (4.6 in)
1947
147.4 mm (5.8 in)
1948
152.1 mm (6.0 in)
1949
75.9 mm (3.0 in)
1950
232.7 mm (9.2 in)
1951
117.3 mm (4.6 in)
1952
110.8 mm (4.4 in)
1953
162.1 mm (6.4 in)
1954
118.7 mm (4.7 in)
1955
147.9 mm (5.8 in)
1956
113.2 mm (4.5 in)
1957
173.7 mm (6.8 in)
1958
116.7 mm (4.6 in)
1959
129.0 mm (5.1 in)
1960
169.4 mm (6.7 in)
1961
239.8 mm (9.4 in)
1962
114.6 mm (4.5 in)
1963
124.0 mm (4.9 in)
1964
225.5 mm (8.9 in)
1965
92.8 mm (3.7 in)
1966
171.6 mm (6.8 in)
1967
99.3 mm (3.9 in)
1968
90.4 mm (3.6 in)
1969
139.0 mm (5.5 in)
1970
134.8 mm (5.3 in)
1971
128.5 mm (5.1 in)
1972
156.5 mm (6.2 in)
1973
134.2 mm (5.3 in)
1974
176.0 mm (6.9 in)
1975
101.8 mm (4.0 in)
1976
161.5 mm (6.4 in)
1977
141.3 mm (5.6 in)
1978
74.0 mm (2.9 in)
1979
86.6 mm (3.4 in)
1980
203.4 mm (8.0 in)
1981
157.8 mm (6.2 in)
1982
101.0 mm (4.0 in)
1983
93.2 mm (3.7 in)
1984
125.4 mm (4.9 in)
1985
112.8 mm (4.4 in)
1986
122.2 mm (4.8 in)
1987
145.3 mm (5.7 in)
1988
117.4 mm (4.6 in)
1989
76.0 mm (3.0 in)
1990
96.0 mm (3.8 in)
1991
94.3 mm (3.7 in)
1992
102.3 mm (4.0 in)
1993
105.3 mm (4.1 in)
1994
96.3 mm (3.8 in)
1995
157.5 mm (6.2 in)
1996
221.8 mm (8.7 in)
1997
94.7 mm (3.7 in)
1998
197.1 mm (7.8 in)
1999
118.4 mm (4.7 in)
2000
164.8 mm (6.5 in)
2001
101.2 mm (4.0 in)
2002
113.1 mm (4.5 in)
2003
96.2 mm (3.8 in)
2004
123.4 mm (4.9 in)
2005
59.5 mm (2.3 in)
2006
91.7 mm (3.6 in)
2007
81.7 mm (3.2 in)
2008
56.4 mm (2.2 in)
2009
76.7 mm (3.0 in)
2010
69.4 mm (2.7 in)
2011
98.5 mm (3.9 in)
2012
107.8 mm (4.2 in)
2013
85.0 mm (3.3 in)
2014
85.6 mm (3.4 in)
2015
106.7 mm (4.2 in)
2016
157.8 mm (6.2 in)
2017
40.9 mm (1.6 in)
2018
61.2 mm (2.4 in)
2019
58.6 mm (2.3 in)
2020
125.3 mm (4.9 in)
2021
101.6 mm (4.0 in)
2022
103.7 mm (4.1 in)
2023
128.0 mm (5.0 in)
2024
127.3 mm (5.0 in)
2025
97.6 mm (3.8 in)
2026
75.5 mm (3.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Cottage Grove Dam, 1943 to 2026. The record is 96 days in 1951, marked on the chart; the median year is 43 days.
Longest dry spell (CDD) at Cottage Grove Dam by year
Year
Longest dry spell (CDD)
1943
27 days
1944
43 days
1945
41 days
1946
20 days
1947
26 days
1948
19 days
1949
43 days
1950
30 days
1951
96 days
1952
66 days
1953
35 days
1954
35 days
1955
48 days
1956
43 days
1957
51 days
1958
58 days
1959
60 days
1960
65 days
1961
28 days
1962
58 days
1963
49 days
1964
19 days
1965
35 days
1966
62 days
1967
79 days
1968
32 days
1969
63 days
1970
38 days
1971
42 days
1972
36 days
1973
59 days
1974
32 days
1975
31 days
1976
28 days
1977
45 days
1978
40 days
1979
34 days
1980
33 days
1981
73 days
1982
17 days
1983
39 days
1984
36 days
1985
52 days
1986
72 days
1987
45 days
1988
74 days
1989
20 days
1990
41 days
1991
45 days
1992
27 days
1993
38 days
1994
40 days
1995
26 days
1996
46 days
1997
40 days
1998
52 days
1999
40 days
2000
57 days
2001
31 days
2002
48 days
2003
51 days
2004
38 days
2005
36 days
2006
63 days
2007
28 days
2008
21 days
2009
47 days
2010
47 days
2011
67 days
2012
59 days
2013
41 days
2014
23 days
2015
87 days
2016
57 days
2017
67 days
2018
72 days
2019
35 days
2020
86 days
2021
65 days
2022
75 days
2023
72 days
2024
61 days
2025
45 days
2026
63 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
75 years with a frost
Across 75 years with a frost, the median last spring frost at Cottage Grove Dam falls on 18 April and the median first autumn frost on 1 November, which leaves a median of 200 days between them.
In 1989 to 2025 the median growing season was 208 days. That is 20 days more than in 1944 to 1973.
Fitted over all years, the growing season changes by +2.0 days per decade at this station.
Frost dates and growing season at Cottage Grove Dam
Measure
Median, all years
Earliest period (1944 to 1973)
Recent period (1989 to 2025)
Recent against earliest
Fitted trend
Last spring frost
18 April
23 April
14 April
9 days earlier
-0.6 days per decade
First autumn frost
1 November
29 October
1 November
3 days later
+1.4 days per decade
Growing days
200 days
188 days
208 days
20 days more
+2.0 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
65 years, 1944 to 2025
A day with at least 58.4 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 142.2 mm (5.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Cottage Grove 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
58.4 mm (2.3 in)
5 years
77.2 mm (3.0 in)
10 years
90.9 mm (3.6 in)
25 years
110.0 mm (4.3 in)
50 years
125.5 mm (4.9 in)
100 years
142.2 mm (5.6 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 1944 to 2025.
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: 145.3 mm (5.7 in) in 1996; 123.2 mm (4.9 in) in 1961; 120.9 mm (4.8 in) in 1981.
Station Changes
3 suspected
3 changes were suspected in the annual mean temperature of Cottage Grove Dam, at 1953, 1985 and 1990. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1953 ran 0.2 C (0.4 F) higher than in the years before (possible change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1985 ran 0.8 C (1.5 F) lower than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1990 ran 0.6 C (1.0 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Cottage Grove Dam, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1953
+0.2
+0.4
possible
5
1985
-0.8
-1.5
likely
5
1990
+0.6
+1.0
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 Cottage Grove Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Cottage Grove 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.