Record envelope, standing records and threshold days for Agassiz Refuge (USC00210050), Minnesota, United States, with 70 years of record.
Key Facts for Agassiz Refuge
Agassiz Refuge (USC00210050) is a weather station in Minnesota, United States at 48.30 latitude and -95.98 longitude, 348 m (1,142 ft) above sea level.
The station reports from 1957 to 2026, 70 years of record.
1,464 records set at Agassiz Refuge still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Agassiz Refuge tied a daily record low maximum temperature of 20.0 C (68.0 F) on 4 August 2026.
About the Station
Location: Minnesota, United States, 48.30 latitude, -95.98 longitude.
Elevation: 348 m (1,142 ft).
Period of record: 1957 to 2026, 70 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
6 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 Agassiz Refuge. The lines show the 2026 daily maximum and minimum. 6 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Agassiz Refuge, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
10.0 C (50.0 F)
-42.2 C (-44.0 F)
-5.6 C (21.9 F)
-33.9 C (-29.0 F)
Feb
13.3 C (55.9 F)
-43.3 C (-45.9 F)
7.8 C (46.0 F)
-26.1 C (-15.0 F)
Mar
21.7 C (71.1 F)
-38.3 C (-36.9 F)
10.0 C (50.0 F)
-25.6 C (-14.1 F)
Apr
34.4 C (93.9 F)
-24.4 C (-11.9 F)
27.2 C (81.0 F)
-12.8 C (9.0 F)
May
35.6 C (96.1 F)
-11.7 C (10.9 F)
32.8 C (91.0 F)
-4.4 C (24.1 F)
Jun
38.3 C (100.9 F)
-2.2 C (28.0 F)
32.2 C (90.0 F)
6.1 C (43.0 F)
Jul
37.2 C (99.0 F)
3.3 C (37.9 F)
34.4 C (93.9 F)
10.0 C (50.0 F)
Aug
36.1 C (97.0 F)
-0.6 C (30.9 F)
28.9 C (84.0 F)
8.3 C (46.9 F)
Sep
34.4 C (93.9 F)
-7.2 C (19.0 F)
n/a
n/a
Oct
31.1 C (88.0 F)
-17.2 C (1.0 F)
n/a
n/a
Nov
21.1 C (70.0 F)
-33.9 C (-29.0 F)
n/a
n/a
Dec
12.2 C (54.0 F)
-40.0 C (-40.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Agassiz Refuge still stand. 1967 holds the most, with 45.
Standing records at Agassiz Refuge by the year they were set
Year set
Standing records
1957
8
1958
28
1959
35
1960
12
1961
23
1962
31
1963
28
1964
24
1965
33
1966
24
1967
45
1968
35
1969
30
1970
16
1971
12
1972
26
1973
25
1974
21
1975
26
1976
26
1977
37
1978
19
1979
16
1980
21
1981
27
1982
20
1983
32
1984
27
1985
23
1986
25
1987
21
1988
34
1989
24
1990
36
1991
41
1992
42
1993
15
1994
16
1995
28
1996
29
1997
35
1998
22
1999
18
2000
33
2001
22
2002
27
2003
33
2004
27
2005
23
2006
30
2007
9
2008
4
2009
10
2010
17
2011
6
2012
6
2013
9
2014
6
2021
9
2022
18
2023
16
2024
19
2025
15
2026
9
All-Time Record Progression
5 new records
5 all-time records were set at Agassiz Refuge between 22 June 1987 and 4 June 2021. Each dot is a new record.
When Agassiz Refuge set new all-time records
Date
Kind
Detail
1987-06-22
Record high maximum temperature
Record high maximum temperature 36.7 C (98.1 F)
1988-07-05
Record high maximum temperature
Record high maximum temperature 37.2 C (99.0 F)
1988-07-05
Record high minimum temperature
Record high minimum temperature 25.6 C (78.1 F)
1996-02-02
Record low minimum temperature
Record low minimum temperature -43.3 C (-45.9 F)
2021-06-04
Record high maximum temperature
Record high maximum temperature 38.3 C (100.9 F)
Wettest Day of Each Month
Aug: 178.6 mm (7.0 in)
The wettest day on record for each calendar month at Agassiz Refuge. The most was 178.6 mm (7.0 in) on 2 August 1964.
Record daily precipitation for each month at Agassiz Refuge
Month
Record daily precipitation (mm)
Date
Jan
22.1 mm (0.9 in)
23 January 2010
Feb
13.2 mm (0.5 in)
24 February 1977
Mar
26.9 mm (1.1 in)
7 March 1983
Apr
41.9 mm (1.6 in)
6 April 1997
May
94.0 mm (3.7 in)
12 May 2004
Jun
153.7 mm (6.1 in)
10 June 2002
Jul
80.5 mm (3.2 in)
2 July 1975
Aug
178.6 mm (7.0 in)
2 August 1964
Sep
78.7 mm (3.1 in)
16 September 2022
Oct
43.2 mm (1.7 in)
27 October 2000
Nov
30.7 mm (1.2 in)
18 November 1958
Dec
18.0 mm (0.7 in)
5 December 1960
Period of Record Coverage
1957 to 2026
Complete yearUnder 90 percent of days
64 years of record at Agassiz Refuge, 1957 to 2026. 13 years have data for under 90 percent of days and are left out of rankings: 1957, 1983, 2007, 2008, 2009, 2010, 2011, 2012 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 49 complete years at Agassiz Refuge, 1958 to 2024. Blue stripes are years cooler than the station's own mean of 3.8 C (38.8 F); red stripes are warmer. The coolest year was 1966, at 1.6 C (34.8 F), and the warmest was 1998, at 6.3 C (43.4 F). The strongest colour marks a difference of 2.6 C (4.7 F).
Annual mean temperature at Agassiz Refuge as warming stripes, 1958 to 2024
Year
Annual mean temperature
Difference from the station mean
1958
3.1 C
-0.72 C
1959
2.3 C
-1.48 C
1960
2.7 C
-1.11 C
1961
3.2 C
-0.56 C
1962
2.7 C
-1.13 C
1963
3.4 C
-0.35 C
1964
2.9 C
-0.89 C
1965
1.6 C
-2.18 C
1966
1.6 C
-2.20 C
1967
1.6 C
-2.16 C
1969
2.8 C
-0.96 C
1970
2.9 C
-0.89 C
1971
3.3 C
-0.53 C
1972
2.6 C
-1.20 C
1973
5.1 C
+1.29 C
1974
3.8 C
-0.03 C
1975
3.6 C
-0.15 C
1976
3.3 C
-0.47 C
1977
3.8 C
0.00 C
1978
2.4 C
-1.34 C
1979
1.7 C
-2.04 C
1980
3.7 C
-0.05 C
1981
4.7 C
+0.94 C
1982
2.6 C
-1.18 C
1984
4.9 C
+1.07 C
1985
2.7 C
-1.13 C
1986
4.3 C
+0.55 C
1987
6.2 C
+2.37 C
1988
4.4 C
+0.63 C
1989
2.9 C
-0.92 C
1990
5.1 C
+1.29 C
1991
4.7 C
+0.89 C
1992
4.0 C
+0.24 C
1993
3.3 C
-0.47 C
1994
4.7 C
+0.92 C
1995
4.3 C
+0.53 C
1996
2.3 C
-1.45 C
1997
3.6 C
-0.15 C
1998
6.3 C
+2.55 C
1999
6.2 C
+2.44 C
2001
6.0 C
+2.25 C
2002
5.2 C
+1.44 C
2003
4.5 C
+0.72 C
2004
3.9 C
+0.12 C
2005
5.1 C
+1.34 C
2006
6.2 C
+2.40 C
2022
2.7 C
-1.11 C
2023
4.8 C
+1.06 C
2024
5.8 C
+2.02 C
The annual mean temperature here has risen by 0.5 C (0.3 to 0.6) per decade over 1958 to 2024. In Fahrenheit: 0.8 F (0.5 to 1.2) per decade. The slope is a straight line fitted to 49 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Agassiz Refuge
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.5 C (0.3 to 0.6) per decade
0.8 F (0.5 to 1.2) per decade
1958 to 2024
49
Rise
Mean daily maximum
0.3 C (0.1 to 0.4) per decade
0.5 F (0.1 to 0.8) per decade
1958 to 2024
49
Rise
Mean daily minimum
0.7 C (0.5 to 0.9) per decade
1.2 F (0.9 to 1.5) per decade
1958 to 2024
49
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
1957 to 2026
Yearly extremes at Agassiz Refuge: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
38.3 C (100.9 F)
2021
33.3 C (91.9 F)
64
Coldest night (TNn)
-43.3 C (-45.9 F)
1996
-35.6 C (-32.1 F)
64
Wettest day (Rx1day)
178.6 mm (7.0 in)
1964
47.5 mm (1.9 in)
65
Wettest five days (Rx5day)
210.7 mm (8.3 in)
2002
71.3 mm (2.8 in)
64
Longest dry spell (CDD)
74 days
1976
26 days
65
Hottest day (TXx)
The hottest day of the year at Agassiz Refuge, 1957 to 2026. The record is 38.3 C (100.9 F) in 2021, marked on the chart; the median year is 33.3 C (91.9 F).
Hottest day (TXx) at Agassiz Refuge by year
Year
Hottest day (TXx)
1957
33.3 C (91.9 F)
1958
33.9 C (93.0 F)
1959
33.3 C (91.9 F)
1960
32.2 C (90.0 F)
1961
35.6 C (96.1 F)
1962
31.1 C (88.0 F)
1963
32.8 C (91.0 F)
1964
35.6 C (96.1 F)
1965
36.1 C (97.0 F)
1966
34.4 C (93.9 F)
1967
33.9 C (93.0 F)
1968
32.2 C (90.0 F)
1969
33.9 C (93.0 F)
1970
34.4 C (93.9 F)
1971
33.9 C (93.0 F)
1972
33.3 C (91.9 F)
1973
32.8 C (91.0 F)
1974
33.3 C (91.9 F)
1975
35.0 C (95.0 F)
1976
34.4 C (93.9 F)
1977
32.8 C (91.0 F)
1978
35.0 C (95.0 F)
1979
31.7 C (89.1 F)
1980
36.1 C (97.0 F)
1981
33.3 C (91.9 F)
1982
31.7 C (89.1 F)
1983
35.6 C (96.1 F)
1984
35.0 C (95.0 F)
1985
32.8 C (91.0 F)
1986
33.9 C (93.0 F)
1987
36.7 C (98.1 F)
1988
37.2 C (99.0 F)
1989
36.1 C (97.0 F)
1990
33.9 C (93.0 F)
1991
33.3 C (91.9 F)
1992
32.2 C (90.0 F)
1993
31.7 C (89.1 F)
1994
28.9 C (84.0 F)
1995
35.0 C (95.0 F)
1996
33.3 C (91.9 F)
1997
33.3 C (91.9 F)
1998
32.2 C (90.0 F)
1999
33.3 C (91.9 F)
2000
32.2 C (90.0 F)
2001
34.4 C (93.9 F)
2002
33.9 C (93.0 F)
2003
36.1 C (97.0 F)
2004
31.1 C (88.0 F)
2005
32.8 C (91.0 F)
2006
36.7 C (98.1 F)
2007
25.0 C (77.0 F)
2008
18.9 C (66.0 F)
2009
21.7 C (71.1 F)
2010
20.6 C (69.1 F)
2011
21.7 C (71.1 F)
2012
16.1 C (61.0 F)
2013
29.4 C (84.9 F)
2014
17.8 C (64.0 F)
2017
n/a
2021
38.3 C (100.9 F)
2022
35.0 C (95.0 F)
2023
34.4 C (93.9 F)
2024
30.6 C (87.1 F)
2025
35.6 C (96.1 F)
2026
34.4 C (93.9 F)
Coldest night (TNn)
The coldest night of the year at Agassiz Refuge, 1957 to 2026. The record is -43.3 C (-45.9 F) in 1996, marked on the chart; the median year is -35.6 C (-32.1 F).
Coldest night (TNn) at Agassiz Refuge by year
Year
Coldest night (TNn)
1957
-28.3 C (-18.9 F)
1958
-33.3 C (-27.9 F)
1959
-38.3 C (-36.9 F)
1960
-33.3 C (-27.9 F)
1961
-36.7 C (-34.1 F)
1962
-40.6 C (-41.1 F)
1963
-37.2 C (-35.0 F)
1964
-31.7 C (-25.1 F)
1965
-38.3 C (-36.9 F)
1966
-42.2 C (-44.0 F)
1967
-40.0 C (-40.0 F)
1968
-41.7 C (-43.1 F)
1969
-34.4 C (-29.9 F)
1970
-37.2 C (-35.0 F)
1971
-34.4 C (-29.9 F)
1972
-38.9 C (-38.0 F)
1973
-37.8 C (-36.0 F)
1974
-36.7 C (-34.1 F)
1975
-33.3 C (-27.9 F)
1976
-37.2 C (-35.0 F)
1977
-38.3 C (-36.9 F)
1978
-33.9 C (-29.0 F)
1979
-37.2 C (-35.0 F)
1980
-32.8 C (-27.0 F)
1981
-35.6 C (-32.1 F)
1982
-40.0 C (-40.0 F)
1983
-35.0 C (-31.0 F)
1984
-35.6 C (-32.1 F)
1985
-37.2 C (-35.0 F)
1986
-35.6 C (-32.1 F)
1987
-37.8 C (-36.0 F)
1988
-35.6 C (-32.1 F)
1989
-41.1 C (-42.0 F)
1990
-37.2 C (-35.0 F)
1991
-35.6 C (-32.1 F)
1992
-33.3 C (-27.9 F)
1993
-33.9 C (-29.0 F)
1994
-37.8 C (-36.0 F)
1995
-33.9 C (-29.0 F)
1996
-43.3 C (-45.9 F)
1997
-40.0 C (-40.0 F)
1998
-31.1 C (-24.0 F)
1999
-32.8 C (-27.0 F)
2000
-35.0 C (-31.0 F)
2001
-31.1 C (-24.0 F)
2002
-26.7 C (-16.1 F)
2003
-35.0 C (-31.0 F)
2004
-38.3 C (-36.9 F)
2005
-40.6 C (-41.1 F)
2006
-33.3 C (-27.9 F)
2007
-36.7 C (-34.1 F)
2008
-32.2 C (-26.0 F)
2009
-40.6 C (-41.1 F)
2010
-39.4 C (-38.9 F)
2011
-40.0 C (-40.0 F)
2012
-30.6 C (-23.1 F)
2013
-33.9 C (-29.0 F)
2014
-38.9 C (-38.0 F)
2017
n/a
2021
-33.3 C (-27.9 F)
2022
-34.4 C (-29.9 F)
2023
-32.2 C (-26.0 F)
2024
-28.3 C (-18.9 F)
2025
-33.3 C (-27.9 F)
2026
-33.9 C (-29.0 F)
Wettest day (Rx1day)
The wettest day of the year at Agassiz Refuge, 1957 to 2026. The record is 178.6 mm (7.0 in) in 1964, marked on the chart; the median year is 47.5 mm (1.9 in).
Wettest day (Rx1day) at Agassiz Refuge by year
Year
Wettest day (Rx1day)
1957
68.3 mm (2.7 in)
1958
49.5 mm (1.9 in)
1959
58.4 mm (2.3 in)
1960
36.8 mm (1.4 in)
1961
35.8 mm (1.4 in)
1962
26.9 mm (1.1 in)
1963
35.6 mm (1.4 in)
1964
178.6 mm (7.0 in)
1965
53.1 mm (2.1 in)
1966
45.7 mm (1.8 in)
1967
31.2 mm (1.2 in)
1968
70.9 mm (2.8 in)
1969
44.7 mm (1.8 in)
1970
57.4 mm (2.3 in)
1971
34.5 mm (1.4 in)
1972
43.7 mm (1.7 in)
1973
41.1 mm (1.6 in)
1974
45.2 mm (1.8 in)
1975
80.5 mm (3.2 in)
1976
64.3 mm (2.5 in)
1977
44.5 mm (1.8 in)
1978
38.1 mm (1.5 in)
1979
47.0 mm (1.9 in)
1980
20.1 mm (0.8 in)
1981
56.9 mm (2.2 in)
1982
49.0 mm (1.9 in)
1983
51.8 mm (2.0 in)
1984
54.1 mm (2.1 in)
1985
49.0 mm (1.9 in)
1986
34.3 mm (1.4 in)
1987
51.1 mm (2.0 in)
1988
58.4 mm (2.3 in)
1989
35.6 mm (1.4 in)
1990
33.3 mm (1.3 in)
1991
47.5 mm (1.9 in)
1992
48.3 mm (1.9 in)
1993
43.2 mm (1.7 in)
1994
53.3 mm (2.1 in)
1995
46.0 mm (1.8 in)
1996
71.9 mm (2.8 in)
1997
58.4 mm (2.3 in)
1998
72.1 mm (2.8 in)
1999
49.8 mm (2.0 in)
2000
43.2 mm (1.7 in)
2001
70.6 mm (2.8 in)
2002
153.7 mm (6.1 in)
2003
30.5 mm (1.2 in)
2004
94.0 mm (3.7 in)
2005
70.6 mm (2.8 in)
2006
47.5 mm (1.9 in)
2007
33.8 mm (1.3 in)
2008
18.8 mm (0.7 in)
2009
17.8 mm (0.7 in)
2010
22.1 mm (0.9 in)
2011
23.6 mm (0.9 in)
2012
41.9 mm (1.6 in)
2013
25.9 mm (1.0 in)
2014
63.2 mm (2.5 in)
2017
0.0 mm (0.00 in)
2021
48.5 mm (1.9 in)
2022
78.7 mm (3.1 in)
2023
36.8 mm (1.4 in)
2024
81.3 mm (3.2 in)
2025
39.9 mm (1.6 in)
2026
57.2 mm (2.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Agassiz Refuge, 1957 to 2026. The record is 210.7 mm (8.3 in) in 2002, marked on the chart; the median year is 71.3 mm (2.8 in).
Wettest five days (Rx5day) at Agassiz Refuge by year
Year
Wettest five days (Rx5day)
1957
126.2 mm (5.0 in)
1958
91.9 mm (3.6 in)
1959
108.7 mm (4.3 in)
1960
85.3 mm (3.4 in)
1961
75.7 mm (3.0 in)
1962
63.6 mm (2.5 in)
1963
67.1 mm (2.6 in)
1964
184.7 mm (7.3 in)
1965
98.1 mm (3.9 in)
1966
82.1 mm (3.2 in)
1967
68.0 mm (2.7 in)
1968
134.9 mm (5.3 in)
1969
50.1 mm (2.0 in)
1970
78.5 mm (3.1 in)
1971
86.6 mm (3.4 in)
1972
48.3 mm (1.9 in)
1973
98.2 mm (3.9 in)
1974
71.4 mm (2.8 in)
1975
130.6 mm (5.1 in)
1976
78.6 mm (3.1 in)
1977
69.1 mm (2.7 in)
1978
56.9 mm (2.2 in)
1979
70.9 mm (2.8 in)
1980
47.3 mm (1.9 in)
1981
57.1 mm (2.2 in)
1982
65.3 mm (2.6 in)
1983
87.1 mm (3.4 in)
1984
127.6 mm (5.0 in)
1985
124.0 mm (4.9 in)
1986
59.1 mm (2.3 in)
1987
70.7 mm (2.8 in)
1988
73.4 mm (2.9 in)
1989
60.5 mm (2.4 in)
1990
55.5 mm (2.2 in)
1991
88.9 mm (3.5 in)
1992
78.5 mm (3.1 in)
1993
68.0 mm (2.7 in)
1994
68.6 mm (2.7 in)
1995
55.2 mm (2.2 in)
1996
98.4 mm (3.9 in)
1997
97.8 mm (3.9 in)
1998
104.1 mm (4.1 in)
1999
82.6 mm (3.3 in)
2000
67.9 mm (2.7 in)
2001
103.9 mm (4.1 in)
2002
210.7 mm (8.3 in)
2003
49.2 mm (1.9 in)
2004
108.5 mm (4.3 in)
2005
73.6 mm (2.9 in)
2006
72.6 mm (2.9 in)
2007
59.8 mm (2.4 in)
2008
39.1 mm (1.5 in)
2009
52.1 mm (2.1 in)
2010
24.0 mm (0.9 in)
2011
27.1 mm (1.1 in)
2012
14.2 mm (0.6 in)
2013
71.1 mm (2.8 in)
2014
4.6 mm (0.18 in)
2017
n/a
2021
48.8 mm (1.9 in)
2022
82.0 mm (3.2 in)
2023
40.4 mm (1.6 in)
2024
85.1 mm (3.4 in)
2025
55.9 mm (2.2 in)
2026
35.5 mm (1.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Agassiz Refuge, 1957 to 2026. The record is 74 days in 1976, marked on the chart; the median year is 26 days.
Longest dry spell (CDD) at Agassiz Refuge by year
Year
Longest dry spell (CDD)
1957
31 days
1958
26 days
1959
28 days
1960
52 days
1961
29 days
1962
21 days
1963
31 days
1964
37 days
1965
34 days
1966
21 days
1967
24 days
1968
35 days
1969
19 days
1970
25 days
1971
28 days
1972
23 days
1973
26 days
1974
28 days
1975
19 days
1976
74 days
1977
19 days
1978
52 days
1979
19 days
1980
23 days
1981
30 days
1982
18 days
1983
23 days
1984
36 days
1985
39 days
1986
39 days
1987
35 days
1988
39 days
1989
31 days
1990
46 days
1991
17 days
1992
26 days
1993
37 days
1994
24 days
1995
21 days
1996
18 days
1997
24 days
1998
28 days
1999
39 days
2000
21 days
2001
24 days
2002
25 days
2003
23 days
2004
23 days
2005
29 days
2006
24 days
2007
28 days
2008
31 days
2009
35 days
2010
22 days
2011
43 days
2012
21 days
2013
13 days
2014
6 days
2017
1 day
2021
9 days
2022
28 days
2023
18 days
2024
42 days
2025
37 days
2026
4 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
49 years with a frost
Across 49 years with a frost, the median last spring frost at Agassiz Refuge falls on 14 May and the median first autumn frost on 20 September, which leaves a median of 128 days between them.
Fitted over all years, the growing season changes by +5.2 days per decade at this station.
Frost dates and growing season at Agassiz Refuge
Measure
Median, all years
Earliest period
Recent period (1978 to 2024)
Recent against earliest
Fitted trend
Last spring frost
14 May
n/a
11 May
n/a
-2.8 days per decade
First autumn frost
20 September
n/a
23 September
n/a
+2.4 days per decade
Growing days
128 days
n/a
134 days
n/a
+5.2 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
48 years, 1958 to 2024
A day with at least 47.5 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 165.3 mm (6.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Agassiz Refuge: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
47.5 mm (1.9 in)
5 years
66.9 mm (2.6 in)
10 years
83.5 mm (3.3 in)
25 years
110.2 mm (4.3 in)
50 years
135.2 mm (5.3 in)
Longer than the 48 years of record
100 years
165.3 mm (6.5 in)
Longer than the 48 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, 48 years of values from 1958 to 2024.
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: 178.6 mm (7.0 in) in 1964; 153.7 mm (6.1 in) in 2002; 94.0 mm (3.7 in) in 2004.
Station Changes
3 suspected
3 changes were suspected in the annual mean temperature of Agassiz Refuge, at 1969, 1976 and 1993. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1969 ran 1.0 C (1.8 F) higher than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1976 ran 0.4 C (0.8 F) lower than in the years before (possible change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1993 ran 0.6 C (1.0 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Agassiz Refuge, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1969
+1.0
+1.8
likely
5
1976
-0.4
-0.8
possible
5
1993
+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 Agassiz Refuge standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Agassiz Refuge 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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.