Record envelope, standing records and threshold days for Superior (USC00028348), Arizona, United States, with 87 years of record.
Key Facts for Superior
Superior (USC00028348) is a weather station in Arizona, United States at 33.30 latitude and -111.10 longitude, 872 m (2,860 ft) above sea level.
The station reports from 1920 to 2006, 87 years of record.
1,464 records set at Superior still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Superior set a daily record precipitation of 16.5 mm (0.6 in) on 8 August 2006.
About the Station
Location: Arizona, United States, 33.30 latitude, -111.10 longitude.
Elevation: 872 m (2,860 ft).
Period of record: 1920 to 2006, 87 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 days at or beyond a record
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Superior. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Superior, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
27.2 C (81.0 F)
-6.7 C (19.9 F)
n/a
n/a
Feb
30.6 C (87.1 F)
-5.0 C (23.0 F)
n/a
n/a
Mar
32.8 C (91.0 F)
-4.4 C (24.1 F)
n/a
n/a
Apr
35.6 C (96.1 F)
-0.6 C (30.9 F)
n/a
n/a
May
40.6 C (105.1 F)
2.8 C (37.0 F)
n/a
n/a
Jun
43.9 C (111.0 F)
10.0 C (50.0 F)
n/a
n/a
Jul
44.4 C (111.9 F)
15.0 C (59.0 F)
n/a
n/a
Aug
43.3 C (109.9 F)
16.1 C (61.0 F)
n/a
n/a
Sep
41.1 C (106.0 F)
7.2 C (45.0 F)
n/a
n/a
Oct
38.9 C (102.0 F)
2.8 C (37.0 F)
n/a
n/a
Nov
31.7 C (89.1 F)
-1.7 C (28.9 F)
n/a
n/a
Dec
28.3 C (82.9 F)
-7.2 C (19.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Superior still stand. 1962 holds the most, with 55.
Standing records at Superior by the year they were set
Year set
Standing records
1953
8
1954
23
1955
37
1956
41
1957
28
1958
37
1959
27
1960
30
1961
13
1962
55
1963
28
1964
27
1965
39
1966
17
1967
23
1968
19
1969
28
1970
23
1971
51
1972
39
1973
27
1974
27
1975
38
1976
16
1977
18
1978
19
1979
28
1980
28
1981
19
1982
25
1983
21
1984
17
1985
50
1986
54
1987
28
1988
31
1989
32
1990
25
1991
24
1992
28
1993
12
1994
33
1995
34
1996
20
1997
9
1998
13
1999
36
2000
37
2001
22
2002
14
2003
35
2004
18
2005
16
2006
17
All-Time Record Progression
6 new records
6 all-time records were set at Superior between 22 March 1954 and 29 July 1995. Each dot is a new record.
When Superior set new all-time records
Date
Kind
Detail
1954-03-22
Record daily precipitation
Record daily precipitation 93.0 mm (3.7 in)
1959-10-30
Record daily precipitation
Record daily precipitation 94.5 mm (3.7 in)
1985-02-02
Record low maximum temperature
Record low maximum temperature 0.6 C (33.1 F)
1990-08-14
Record daily precipitation
Record daily precipitation 96.5 mm (3.8 in)
1994-06-26
Record high minimum temperature
Record high minimum temperature 33.9 C (93.0 F)
1995-07-29
Record high maximum temperature
Record high maximum temperature 44.4 C (111.9 F)
Wettest Day of Each Month
Aug: 96.5 mm (3.8 in)
The wettest day on record for each calendar month at Superior. The most was 96.5 mm (3.8 in) on 14 August 1990.
Record daily precipitation for each month at Superior
Month
Record daily precipitation (mm)
Date
Jan
65.0 mm (2.6 in)
24 January 1943
Feb
64.3 mm (2.5 in)
13 February 2005
Mar
93.0 mm (3.7 in)
22 March 1954
Apr
37.8 mm (1.5 in)
2 April 1999
May
43.9 mm (1.7 in)
2 May 1941
Jun
31.5 mm (1.2 in)
23 June 1972
Jul
50.8 mm (2.0 in)
18 July 1976
Aug
96.5 mm (3.8 in)
14 August 1990
Sep
69.9 mm (2.8 in)
18 September 1946
Oct
94.5 mm (3.7 in)
30 October 1959
Nov
67.6 mm (2.7 in)
13 November 1941
Dec
74.2 mm (2.9 in)
15 December 1967
Period of Record Coverage
1953 to 2006
Complete yearUnder 90 percent of days
54 years of record at Superior, 1953 to 2006. 11 years have data for under 90 percent of days and are left out of rankings: 1953, 1980, 1981, 1982, 1987, 1996, 1997, 1998 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 43 complete years at Superior, 1954 to 2003. Blue stripes are years cooler than the station's own mean of 20.5 C (68.9 F); red stripes are warmer. The coolest year was 1985, at 19.3 C (66.8 F), and the warmest was 1989, at 21.7 C (71.0 F). The strongest colour marks a difference of 1.2 C (2.2 F).
Annual mean temperature at Superior as warming stripes, 1954 to 2003
Year
Annual mean temperature
Difference from the station mean
1954
21.4 C
+0.90 C
1955
20.1 C
-0.38 C
1956
20.8 C
+0.29 C
1957
20.2 C
-0.31 C
1958
21.0 C
+0.49 C
1959
21.0 C
+0.47 C
1960
20.6 C
+0.15 C
1961
20.4 C
-0.05 C
1962
20.8 C
+0.29 C
1963
20.6 C
+0.13 C
1964
19.5 C
-1.04 C
1965
20.0 C
-0.54 C
1966
20.5 C
-0.01 C
1967
20.1 C
-0.40 C
1968
20.3 C
-0.21 C
1969
20.6 C
+0.13 C
1970
20.5 C
-0.02 C
1971
19.7 C
-0.82 C
1972
20.9 C
+0.38 C
1973
19.9 C
-0.61 C
1974
20.2 C
-0.28 C
1975
19.6 C
-0.90 C
1976
19.9 C
-0.56 C
1977
20.6 C
+0.08 C
1978
20.4 C
-0.14 C
1981
21.5 C
+1.03 C
1982
19.5 C
-0.97 C
1983
19.7 C
-0.81 C
1984
19.9 C
-0.58 C
1985
19.3 C
-1.17 C
1986
20.7 C
+0.18 C
1988
20.4 C
-0.12 C
1989
21.7 C
+1.16 C
1990
20.3 C
-0.21 C
1991
20.0 C
-0.53 C
1992
20.2 C
-0.26 C
1994
20.7 C
+0.21 C
1995
21.1 C
+0.64 C
1999
21.4 C
+0.91 C
2000
21.5 C
+1.02 C
2001
21.0 C
+0.55 C
2002
21.6 C
+1.06 C
2003
21.6 C
+1.06 C
The fitted trend in annual mean temperature here over 1954 to 2003 is 0.12 C (-0.02 to 0.25) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.21 F (-0.03 to 0.44) per decade. The slope is a straight line fitted to 43 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Superior
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.12 C (-0.02 to 0.25) per decade
0.21 F (-0.03 to 0.44) per decade
1954 to 2003
43
Not clearly different from zero
Mean daily maximum
0.13 C (-0.04 to 0.30) per decade
0.2 F (-0.1 to 0.5) per decade
1954 to 2003
43
Not clearly different from zero
Mean daily minimum
0.1 C (-0.1 to 0.3) per decade
0.2 F (-0.1 to 0.5) per decade
1954 to 2003
43
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
1920 to 2006
Yearly extremes at Superior: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
44.4 C (111.9 F)
1995
41.1 C (106.0 F)
54
Coldest night (TNn)
-7.2 C (19.0 F)
1978
-1.7 C (28.9 F)
54
Wettest day (Rx1day)
96.5 mm (3.8 in)
1990
45.7 mm (1.8 in)
87
Wettest five days (Rx5day)
222.3 mm (8.8 in)
1990
70.4 mm (2.8 in)
87
Longest dry spell (CDD)
150 days
1972
62 days
87
Hottest day (TXx)
The hottest day of the year at Superior, 1920 to 2006. The record is 44.4 C (111.9 F) in 1995, marked on the chart; the median year is 41.1 C (106.0 F).
Hottest day (TXx) at Superior by year
Year
Hottest day (TXx)
1920
n/a
1921
n/a
1922
n/a
1923
n/a
1924
n/a
1925
n/a
1926
n/a
1927
n/a
1928
n/a
1929
n/a
1930
n/a
1931
n/a
1932
n/a
1933
n/a
1934
n/a
1935
n/a
1936
n/a
1937
n/a
1938
n/a
1939
n/a
1940
n/a
1941
n/a
1942
n/a
1943
n/a
1944
n/a
1945
n/a
1946
n/a
1947
n/a
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
37.2 C (99.0 F)
1954
41.1 C (106.0 F)
1955
41.1 C (106.0 F)
1956
41.1 C (106.0 F)
1957
41.7 C (107.1 F)
1958
43.9 C (111.0 F)
1959
40.6 C (105.1 F)
1960
42.2 C (108.0 F)
1961
41.1 C (106.0 F)
1962
41.1 C (106.0 F)
1963
40.0 C (104.0 F)
1964
40.0 C (104.0 F)
1965
41.1 C (106.0 F)
1966
40.6 C (105.1 F)
1967
40.0 C (104.0 F)
1968
41.7 C (107.1 F)
1969
42.8 C (109.0 F)
1970
43.9 C (111.0 F)
1971
41.1 C (106.0 F)
1972
42.8 C (109.0 F)
1973
42.2 C (108.0 F)
1974
43.9 C (111.0 F)
1975
41.7 C (107.1 F)
1976
42.2 C (108.0 F)
1977
40.6 C (105.1 F)
1978
41.7 C (107.1 F)
1979
42.8 C (109.0 F)
1980
42.2 C (108.0 F)
1981
41.1 C (106.0 F)
1982
40.6 C (105.1 F)
1983
42.8 C (109.0 F)
1984
40.6 C (105.1 F)
1985
43.3 C (109.9 F)
1986
41.7 C (107.1 F)
1987
40.0 C (104.0 F)
1988
42.2 C (108.0 F)
1989
42.2 C (108.0 F)
1990
43.9 C (111.0 F)
1991
39.4 C (102.9 F)
1992
39.4 C (102.9 F)
1993
41.1 C (106.0 F)
1994
42.8 C (109.0 F)
1995
44.4 C (111.9 F)
1996
40.0 C (104.0 F)
1997
40.0 C (104.0 F)
1998
28.3 C (82.9 F)
1999
40.0 C (104.0 F)
2000
41.1 C (106.0 F)
2001
42.2 C (108.0 F)
2002
41.1 C (106.0 F)
2003
42.8 C (109.0 F)
2004
40.6 C (105.1 F)
2005
42.2 C (108.0 F)
2006
43.9 C (111.0 F)
Coldest night (TNn)
The coldest night of the year at Superior, 1920 to 2006. The record is -7.2 C (19.0 F) in 1978, marked on the chart; the median year is -1.7 C (28.9 F).
Coldest night (TNn) at Superior by year
Year
Coldest night (TNn)
1920
n/a
1921
n/a
1922
n/a
1923
n/a
1924
n/a
1925
n/a
1926
n/a
1927
n/a
1928
n/a
1929
n/a
1930
n/a
1931
n/a
1932
n/a
1933
n/a
1934
n/a
1935
n/a
1936
n/a
1937
n/a
1938
n/a
1939
n/a
1940
n/a
1941
n/a
1942
n/a
1943
n/a
1944
n/a
1945
n/a
1946
n/a
1947
n/a
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
-1.1 C (30.0 F)
1954
-1.7 C (28.9 F)
1955
-3.9 C (25.0 F)
1956
-2.8 C (27.0 F)
1957
1.1 C (34.0 F)
1958
-1.7 C (28.9 F)
1959
0.0 C (32.0 F)
1960
-3.3 C (26.1 F)
1961
1.1 C (34.0 F)
1962
-6.7 C (19.9 F)
1963
-5.6 C (21.9 F)
1964
-1.7 C (28.9 F)
1965
-1.7 C (28.9 F)
1966
-2.2 C (28.0 F)
1967
-1.1 C (30.0 F)
1968
-5.0 C (23.0 F)
1969
-0.6 C (30.9 F)
1970
-1.7 C (28.9 F)
1971
-4.4 C (24.1 F)
1972
-1.7 C (28.9 F)
1973
-1.1 C (30.0 F)
1974
-6.1 C (21.0 F)
1975
-6.7 C (19.9 F)
1976
-1.7 C (28.9 F)
1977
0.0 C (32.0 F)
1978
-7.2 C (19.0 F)
1979
-3.3 C (26.1 F)
1980
-0.6 C (30.9 F)
1981
0.0 C (32.0 F)
1982
-1.7 C (28.9 F)
1983
0.0 C (32.0 F)
1984
-3.3 C (26.1 F)
1985
-3.9 C (25.0 F)
1986
0.0 C (32.0 F)
1987
-4.4 C (24.1 F)
1988
-6.1 C (21.0 F)
1989
-1.1 C (30.0 F)
1990
-5.0 C (23.0 F)
1991
-0.6 C (30.9 F)
1992
0.6 C (33.1 F)
1993
2.2 C (36.0 F)
1994
-1.1 C (30.0 F)
1995
0.0 C (32.0 F)
1996
-0.6 C (30.9 F)
1997
-2.2 C (28.0 F)
1998
-2.2 C (28.0 F)
1999
-0.6 C (30.9 F)
2000
0.0 C (32.0 F)
2001
-0.6 C (30.9 F)
2002
-1.1 C (30.0 F)
2003
-2.8 C (27.0 F)
2004
-1.1 C (30.0 F)
2005
-0.6 C (30.9 F)
2006
0.0 C (32.0 F)
Wettest day (Rx1day)
The wettest day of the year at Superior, 1920 to 2006. The record is 96.5 mm (3.8 in) in 1990, marked on the chart; the median year is 45.7 mm (1.8 in).
Wettest day (Rx1day) at Superior by year
Year
Wettest day (Rx1day)
1920
64.8 mm (2.6 in)
1921
37.6 mm (1.5 in)
1922
48.3 mm (1.9 in)
1923
42.9 mm (1.7 in)
1924
22.1 mm (0.9 in)
1925
43.2 mm (1.7 in)
1926
36.3 mm (1.4 in)
1927
46.5 mm (1.8 in)
1928
45.7 mm (1.8 in)
1929
22.1 mm (0.9 in)
1930
77.7 mm (3.1 in)
1931
65.3 mm (2.6 in)
1932
45.7 mm (1.8 in)
1933
67.3 mm (2.6 in)
1934
27.7 mm (1.1 in)
1935
41.1 mm (1.6 in)
1936
50.5 mm (2.0 in)
1937
44.5 mm (1.8 in)
1938
43.2 mm (1.7 in)
1939
42.7 mm (1.7 in)
1940
45.7 mm (1.8 in)
1941
67.6 mm (2.7 in)
1942
35.1 mm (1.4 in)
1943
68.3 mm (2.7 in)
1944
39.1 mm (1.5 in)
1945
66.3 mm (2.6 in)
1946
69.9 mm (2.8 in)
1947
50.8 mm (2.0 in)
1948
34.8 mm (1.4 in)
1949
36.6 mm (1.4 in)
1950
30.7 mm (1.2 in)
1951
48.3 mm (1.9 in)
1952
47.0 mm (1.9 in)
1953
35.1 mm (1.4 in)
1954
93.0 mm (3.7 in)
1955
38.6 mm (1.5 in)
1956
49.3 mm (1.9 in)
1957
31.5 mm (1.2 in)
1958
45.7 mm (1.8 in)
1959
94.5 mm (3.7 in)
1960
33.8 mm (1.3 in)
1961
36.1 mm (1.4 in)
1962
50.3 mm (2.0 in)
1963
74.2 mm (2.9 in)
1964
39.1 mm (1.5 in)
1965
69.1 mm (2.7 in)
1966
42.4 mm (1.7 in)
1967
74.2 mm (2.9 in)
1968
36.3 mm (1.4 in)
1969
46.5 mm (1.8 in)
1970
47.0 mm (1.9 in)
1971
66.5 mm (2.6 in)
1972
71.6 mm (2.8 in)
1973
36.3 mm (1.4 in)
1974
43.4 mm (1.7 in)
1975
52.1 mm (2.1 in)
1976
50.8 mm (2.0 in)
1977
34.3 mm (1.4 in)
1978
70.9 mm (2.8 in)
1979
43.9 mm (1.7 in)
1980
31.2 mm (1.2 in)
1981
45.0 mm (1.8 in)
1982
55.1 mm (2.2 in)
1983
49.5 mm (1.9 in)
1984
59.9 mm (2.4 in)
1985
38.9 mm (1.5 in)
1986
36.8 mm (1.4 in)
1987
50.8 mm (2.0 in)
1988
44.7 mm (1.8 in)
1989
37.8 mm (1.5 in)
1990
96.5 mm (3.8 in)
1991
49.0 mm (1.9 in)
1992
50.5 mm (2.0 in)
1993
51.3 mm (2.0 in)
1994
45.2 mm (1.8 in)
1995
56.6 mm (2.2 in)
1996
33.0 mm (1.3 in)
1997
35.3 mm (1.4 in)
1998
49.3 mm (1.9 in)
1999
39.4 mm (1.6 in)
2000
33.0 mm (1.3 in)
2001
41.7 mm (1.6 in)
2002
16.8 mm (0.7 in)
2003
45.0 mm (1.8 in)
2004
51.1 mm (2.0 in)
2005
64.3 mm (2.5 in)
2006
65.5 mm (2.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Superior, 1920 to 2006. The record is 222.3 mm (8.8 in) in 1990, marked on the chart; the median year is 70.4 mm (2.8 in).
Wettest five days (Rx5day) at Superior by year
Year
Wettest five days (Rx5day)
1920
107.3 mm (4.2 in)
1921
65.8 mm (2.6 in)
1922
77.0 mm (3.0 in)
1923
99.6 mm (3.9 in)
1924
65.8 mm (2.6 in)
1925
67.3 mm (2.6 in)
1926
62.8 mm (2.5 in)
1927
86.4 mm (3.4 in)
1928
69.4 mm (2.7 in)
1929
35.8 mm (1.4 in)
1930
100.6 mm (4.0 in)
1931
110.0 mm (4.3 in)
1932
86.1 mm (3.4 in)
1933
87.2 mm (3.4 in)
1934
42.7 mm (1.7 in)
1935
66.3 mm (2.6 in)
1936
75.9 mm (3.0 in)
1937
77.5 mm (3.1 in)
1938
68.3 mm (2.7 in)
1939
49.1 mm (1.9 in)
1940
60.4 mm (2.4 in)
1941
129.1 mm (5.1 in)
1942
43.2 mm (1.7 in)
1943
85.6 mm (3.4 in)
1944
76.3 mm (3.0 in)
1945
92.0 mm (3.6 in)
1946
114.9 mm (4.5 in)
1947
54.9 mm (2.2 in)
1948
53.9 mm (2.1 in)
1949
76.3 mm (3.0 in)
1950
45.4 mm (1.8 in)
1951
77.8 mm (3.1 in)
1952
60.7 mm (2.4 in)
1953
79.0 mm (3.1 in)
1954
122.0 mm (4.8 in)
1955
80.0 mm (3.1 in)
1956
59.8 mm (2.4 in)
1957
76.2 mm (3.0 in)
1958
51.4 mm (2.0 in)
1959
115.0 mm (4.5 in)
1960
72.2 mm (2.8 in)
1961
47.8 mm (1.9 in)
1962
70.4 mm (2.8 in)
1963
111.4 mm (4.4 in)
1964
39.1 mm (1.5 in)
1965
111.3 mm (4.4 in)
1966
70.6 mm (2.8 in)
1967
180.7 mm (7.1 in)
1968
54.1 mm (2.1 in)
1969
53.9 mm (2.1 in)
1970
89.6 mm (3.5 in)
1971
117.0 mm (4.6 in)
1972
113.7 mm (4.5 in)
1973
51.7 mm (2.0 in)
1974
68.1 mm (2.7 in)
1975
91.7 mm (3.6 in)
1976
63.5 mm (2.5 in)
1977
62.2 mm (2.4 in)
1978
132.1 mm (5.2 in)
1979
69.4 mm (2.7 in)
1980
103.6 mm (4.1 in)
1981
77.4 mm (3.0 in)
1982
68.9 mm (2.7 in)
1983
123.9 mm (4.9 in)
1984
69.6 mm (2.7 in)
1985
47.1 mm (1.9 in)
1986
63.7 mm (2.5 in)
1987
68.8 mm (2.7 in)
1988
77.2 mm (3.0 in)
1989
49.8 mm (2.0 in)
1990
222.3 mm (8.8 in)
1991
56.6 mm (2.2 in)
1992
82.5 mm (3.2 in)
1993
156.7 mm (6.2 in)
1994
55.1 mm (2.2 in)
1995
61.7 mm (2.4 in)
1996
59.9 mm (2.4 in)
1997
48.8 mm (1.9 in)
1998
66.6 mm (2.6 in)
1999
72.1 mm (2.8 in)
2000
66.8 mm (2.6 in)
2001
66.1 mm (2.6 in)
2002
31.6 mm (1.2 in)
2003
79.5 mm (3.1 in)
2004
68.7 mm (2.7 in)
2005
137.7 mm (5.4 in)
2006
73.6 mm (2.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Superior, 1920 to 2006. The record is 150 days in 1972, marked on the chart; the median year is 62 days.
Longest dry spell (CDD) at Superior by year
Year
Longest dry spell (CDD)
1920
43 days
1921
80 days
1922
54 days
1923
55 days
1924
59 days
1925
46 days
1926
31 days
1927
36 days
1928
63 days
1929
96 days
1930
52 days
1931
60 days
1932
47 days
1933
62 days
1934
53 days
1935
53 days
1936
90 days
1937
59 days
1938
99 days
1939
65 days
1940
30 days
1941
43 days
1942
75 days
1943
129 days
1944
52 days
1945
100 days
1946
78 days
1947
70 days
1948
109 days
1949
44 days
1950
53 days
1951
62 days
1952
46 days
1953
81 days
1954
66 days
1955
106 days
1956
75 days
1957
47 days
1958
44 days
1959
66 days
1960
72 days
1961
85 days
1962
67 days
1963
67 days
1964
74 days
1965
39 days
1966
91 days
1967
52 days
1968
78 days
1969
72 days
1970
80 days
1971
94 days
1972
150 days
1973
74 days
1974
96 days
1975
46 days
1976
47 days
1977
49 days
1978
53 days
1979
46 days
1980
54 days
1981
46 days
1982
41 days
1983
76 days
1984
55 days
1985
75 days
1986
62 days
1987
53 days
1988
50 days
1989
54 days
1990
33 days
1991
62 days
1992
34 days
1993
56 days
1994
32 days
1995
86 days
1996
80 days
1997
60 days
1998
23 days
1999
101 days
2000
81 days
2001
49 days
2002
97 days
2003
96 days
2004
96 days
2005
73 days
2006
68 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.
Rainfall Return Levels
82 years, 1921 to 2005
A day with at least 45.4 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 101.1 mm (4.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Superior: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
45.4 mm (1.8 in)
5 years
59.2 mm (2.3 in)
10 years
68.8 mm (2.7 in)
25 years
81.4 mm (3.2 in)
50 years
91.1 mm (3.6 in)
100 years
101.1 mm (4.0 in)
Longer than the 82 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, 82 years of values from 1921 to 2005.
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: 96.5 mm (3.8 in) in 1990; 94.5 mm (3.7 in) in 1959; 93.0 mm (3.7 in) in 1954.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Superior, at 1964 and 1982. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1964 ran 0.2 C (0.3 F) higher than in the years before (possible change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1982 ran 0.3 C (0.6 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Superior, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1964
+0.2
+0.3
possible
5
1982
-0.3
-0.6
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 Superior standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Superior 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.