Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Muroran. 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 Muroran, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
9.5 C (49.1 F)
-13.4 C (7.9 F)
5.7 C (42.3 F)
-6.2 C (20.8 F)
Feb
13.8 C (56.8 F)
-12.1 C (10.2 F)
7.4 C (45.3 F)
-6.0 C (21.2 F)
Mar
16.7 C (62.1 F)
-9.6 C (14.7 F)
10.6 C (51.1 F)
-5.5 C (22.1 F)
Apr
23.1 C (73.6 F)
-4.8 C (23.4 F)
14.3 C (57.7 F)
1.2 C (34.2 F)
May
27.6 C (81.7 F)
0.4 C (32.7 F)
n/a
3.2 C (37.8 F)
Jun
28.7 C (83.7 F)
5.0 C (41.0 F)
24.2 C (75.6 F)
10.5 C (50.9 F)
Jul
31.2 C (88.2 F)
8.5 C (47.3 F)
n/a
16.0 C (60.8 F)
Aug
32.2 C (90.0 F)
11.5 C (52.7 F)
n/a
19.2 C (66.6 F)
Sep
31.0 C (87.8 F)
5.9 C (42.6 F)
n/a
n/a
Oct
24.6 C (76.3 F)
-1.0 C (30.2 F)
n/a
n/a
Nov
21.4 C (70.5 F)
-7.2 C (19.0 F)
n/a
n/a
Dec
14.4 C (57.9 F)
-12.0 C (10.4 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Muroran still stand. 1969 holds the most, with 53.
Standing records at Muroran by the year they were set
Year set
Standing records
1951
36
1952
22
1953
20
1954
33
1955
23
1956
21
1957
15
1958
11
1959
16
1960
15
1961
16
1962
20
1963
15
1964
20
1965
20
1966
36
1967
31
1968
24
1969
53
1970
34
1971
32
1972
22
1973
17
1974
12
1975
10
1976
15
1977
23
1978
30
1979
37
1980
37
1981
28
1982
16
1983
30
1984
39
1985
15
1986
22
1987
34
1988
23
1989
21
1990
20
1991
5
1992
9
1993
13
1994
5
1995
2
1996
8
1997
16
1998
18
1999
20
2000
10
2001
19
2002
11
2003
8
2004
10
2006
5
2007
19
2008
13
2009
6
2010
21
2011
8
2012
27
2013
11
2014
10
2015
15
2016
14
2017
15
2018
17
2019
17
2020
17
2021
25
2022
22
2023
41
2024
19
2025
24
All-Time Record Progression
2 new records
2 all-time records were set at Muroran between 6 August 1984 and 23 July 2025. Each dot is a new record.
When Muroran set new all-time records
Date
Kind
Detail
1984-08-06
Record high minimum temperature
Record high minimum temperature 24.3 C (75.7 F)
2025-07-23
Record high minimum temperature
Record high minimum temperature 24.4 C (75.9 F)
Wettest Day of Each Month
Nov: 170.0 mm (6.7 in)
The wettest day on record for each calendar month at Muroran. The most was 170.0 mm (6.7 in) on 7 November 1975.
Record daily precipitation for each month at Muroran
Month
Record daily precipitation (mm)
Date
Jan
86.0 mm (3.4 in)
31 January 1970
Feb
64.5 mm (2.5 in)
27 February 1972
Mar
85.5 mm (3.4 in)
21 March 1975
Apr
78.6 mm (3.1 in)
16 April 1966
May
97.0 mm (3.8 in)
2 May 1998
Jun
95.0 mm (3.7 in)
13 June 1983
Jul
134.9 mm (5.3 in)
23 July 2008
Aug
165.6 mm (6.5 in)
12 August 2010
Sep
119.1 mm (4.7 in)
7 September 1962
Oct
99.4 mm (3.9 in)
5 October 1961
Nov
170.0 mm (6.7 in)
7 November 1975
Dec
58.4 mm (2.3 in)
23 December 2016
Period of Record Coverage
1951 to 2025
Complete yearUnder 90 percent of days
74 years of record at Muroran, 1951 to 2025. 34 years have data for under 90 percent of days and are left out of rankings: 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 39 complete years at Muroran, 1951 to 1989. Blue stripes are years cooler than the station's own mean of 8.5 C (47.3 F); red stripes are warmer. The coolest year was 1984, at 7.6 C (45.7 F), and the warmest was 1972, at 9.3 C (48.8 F). The strongest colour marks a difference of 1.0 C (1.8 F).
Annual mean temperature at Muroran as warming stripes, 1951 to 1989
Year
Annual mean temperature
Difference from the station mean
1951
9.2 C
+0.66 C
1952
8.1 C
-0.38 C
1953
8.0 C
-0.46 C
1954
7.9 C
-0.63 C
1955
9.0 C
+0.49 C
1956
8.4 C
-0.12 C
1957
8.6 C
+0.05 C
1958
9.1 C
+0.56 C
1959
8.9 C
+0.38 C
1960
8.6 C
+0.08 C
1961
9.1 C
+0.62 C
1962
9.0 C
+0.46 C
1963
9.1 C
+0.57 C
1964
8.3 C
-0.20 C
1965
8.1 C
-0.42 C
1966
8.3 C
-0.19 C
1967
8.7 C
+0.23 C
1968
8.9 C
+0.35 C
1969
7.8 C
-0.66 C
1970
8.6 C
+0.06 C
1971
8.3 C
-0.20 C
1972
9.3 C
+0.82 C
1973
9.0 C
+0.49 C
1974
8.4 C
-0.10 C
1975
9.0 C
+0.50 C
1976
8.2 C
-0.33 C
1977
8.2 C
-0.30 C
1978
8.5 C
-0.01 C
1979
8.5 C
+0.04 C
1980
8.2 C
-0.29 C
1981
7.8 C
-0.66 C
1982
8.7 C
+0.15 C
1983
8.2 C
-0.32 C
1984
7.6 C
-0.91 C
1985
8.2 C
-0.32 C
1986
7.9 C
-0.62 C
1987
8.5 C
+0.02 C
1988
8.2 C
-0.33 C
1989
9.3 C
+0.77 C
The fitted trend in annual mean temperature here over 1951 to 1989 is -0.09 C (-0.22 to 0.04) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.2 F (-0.4 to 0.1) per decade. The slope is a straight line fitted to 39 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Muroran
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.09 C (-0.22 to 0.04) per decade
-0.2 F (-0.4 to 0.1) per decade
1951 to 1989
39
Not clearly different from zero
Mean daily maximum
-0.1 C (-0.2 to 0.1) per decade
-0.2 F (-0.4 to 0.1) per decade
1951 to 1989
39
Not clearly different from zero
Mean daily minimum
-0.09 C (-0.21 to 0.02) per decade
-0.17 F (-0.38 to 0.04) per decade
1951 to 1989
39
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
1951 to 2025
Yearly extremes at Muroran: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
32.2 C (90.0 F)
1951
29.4 C (84.8 F)
74
Coldest night (TNn)
-13.4 C (7.9 F)
1961
-9.5 C (14.8 F)
74
Wettest day (Rx1day)
170.0 mm (6.7 in)
1975
78.6 mm (3.1 in)
74
Wettest five days (Rx5day)
272.0 mm (10.7 in)
1981
114.7 mm (4.5 in)
74
Longest dry spell (CDD)
24 days
1954
13 days
72
Hottest day (TXx)
The hottest day of the year at Muroran, 1951 to 2025. The record is 32.2 C (90.0 F) in 1951, marked on the chart; the median year is 29.4 C (84.8 F).
Hottest day (TXx) at Muroran by year
Year
Hottest day (TXx)
1951
32.2 C (90.0 F)
1952
29.8 C (85.6 F)
1953
29.4 C (84.9 F)
1954
26.2 C (79.2 F)
1955
29.1 C (84.4 F)
1956
26.8 C (80.2 F)
1957
28.2 C (82.8 F)
1958
28.8 C (83.8 F)
1959
28.2 C (82.8 F)
1960
29.3 C (84.7 F)
1961
28.8 C (83.8 F)
1962
29.4 C (84.9 F)
1963
29.8 C (85.6 F)
1964
27.8 C (82.0 F)
1965
28.2 C (82.8 F)
1966
28.6 C (83.5 F)
1967
28.2 C (82.8 F)
1968
27.3 C (81.1 F)
1969
28.0 C (82.4 F)
1970
29.9 C (85.8 F)
1971
30.5 C (86.9 F)
1972
30.0 C (86.0 F)
1973
29.5 C (85.1 F)
1974
29.3 C (84.7 F)
1975
29.0 C (84.2 F)
1976
29.2 C (84.6 F)
1977
29.2 C (84.6 F)
1978
29.5 C (85.1 F)
1979
27.6 C (81.7 F)
1980
25.6 C (78.1 F)
1981
30.4 C (86.7 F)
1982
28.3 C (82.9 F)
1983
30.2 C (86.4 F)
1984
29.7 C (85.5 F)
1985
31.0 C (87.8 F)
1986
29.5 C (85.1 F)
1987
28.1 C (82.6 F)
1988
31.1 C (88.0 F)
1989
29.5 C (85.1 F)
1990
28.8 C (83.8 F)
1991
28.1 C (82.6 F)
1992
27.6 C (81.7 F)
1993
25.7 C (78.3 F)
1994
29.9 C (85.8 F)
1995
28.0 C (82.4 F)
1996
28.0 C (82.4 F)
1997
29.6 C (85.3 F)
1998
26.5 C (79.7 F)
1999
29.8 C (85.6 F)
2000
29.5 C (85.1 F)
2001
27.3 C (81.1 F)
2002
28.4 C (83.1 F)
2003
27.2 C (81.0 F)
2004
29.5 C (85.1 F)
2006
30.5 C (86.9 F)
2007
30.9 C (87.6 F)
2008
28.1 C (82.6 F)
2009
26.9 C (80.4 F)
2010
31.0 C (87.8 F)
2011
30.5 C (86.9 F)
2012
30.7 C (87.3 F)
2013
29.2 C (84.6 F)
2014
31.1 C (88.0 F)
2015
30.5 C (86.9 F)
2016
29.5 C (85.1 F)
2017
30.0 C (86.0 F)
2018
29.6 C (85.3 F)
2019
31.0 C (87.8 F)
2020
31.8 C (89.2 F)
2021
31.2 C (88.2 F)
2022
28.4 C (83.1 F)
2023
30.9 C (87.6 F)
2024
29.8 C (85.6 F)
2025
24.2 C (75.6 F)
Coldest night (TNn)
The coldest night of the year at Muroran, 1951 to 2025. The record is -13.4 C (7.9 F) in 1961, marked on the chart; the median year is -9.5 C (14.8 F).
Coldest night (TNn) at Muroran by year
Year
Coldest night (TNn)
1951
-10.7 C (12.7 F)
1952
-11.8 C (10.8 F)
1953
-9.7 C (14.5 F)
1954
-11.6 C (11.1 F)
1955
-9.1 C (15.6 F)
1956
-9.5 C (14.9 F)
1957
-10.9 C (12.4 F)
1958
-9.3 C (15.3 F)
1959
-9.3 C (15.3 F)
1960
-9.2 C (15.4 F)
1961
-13.4 C (7.9 F)
1962
-10.9 C (12.4 F)
1963
-8.4 C (16.9 F)
1964
-9.5 C (14.9 F)
1965
-10.4 C (13.3 F)
1966
-12.7 C (9.1 F)
1967
-12.8 C (9.0 F)
1968
-9.9 C (14.2 F)
1969
-11.6 C (11.1 F)
1970
-9.4 C (15.1 F)
1971
-9.1 C (15.6 F)
1972
-8.6 C (16.5 F)
1973
-7.8 C (18.0 F)
1974
-9.2 C (15.4 F)
1975
-9.2 C (15.4 F)
1976
-10.3 C (13.5 F)
1977
-11.3 C (11.7 F)
1978
-11.2 C (11.8 F)
1979
-11.0 C (12.2 F)
1980
-9.8 C (14.4 F)
1981
-8.0 C (17.6 F)
1982
-9.3 C (15.3 F)
1983
-8.9 C (16.0 F)
1984
-12.0 C (10.4 F)
1985
-9.6 C (14.7 F)
1986
-10.6 C (12.9 F)
1987
-10.2 C (13.6 F)
1988
-9.2 C (15.4 F)
1989
-8.8 C (16.2 F)
1990
-9.1 C (15.6 F)
1991
-7.1 C (19.2 F)
1992
-8.4 C (16.9 F)
1993
-7.0 C (19.4 F)
1994
-9.6 C (14.7 F)
1995
-8.0 C (17.6 F)
1996
-11.2 C (11.8 F)
1997
-8.1 C (17.4 F)
1998
-11.3 C (11.7 F)
1999
-9.9 C (14.2 F)
2000
-10.4 C (13.3 F)
2001
-12.1 C (10.2 F)
2002
-9.1 C (15.6 F)
2003
-9.7 C (14.5 F)
2004
-7.5 C (18.5 F)
2006
-10.2 C (13.6 F)
2007
-5.8 C (21.6 F)
2008
-9.4 C (15.1 F)
2009
-7.0 C (19.4 F)
2010
-11.2 C (11.8 F)
2011
-9.1 C (15.6 F)
2012
-10.4 C (13.3 F)
2013
-8.7 C (16.3 F)
2014
-10.2 C (13.6 F)
2015
-7.7 C (18.1 F)
2016
-7.7 C (18.1 F)
2017
-9.2 C (15.4 F)
2018
-10.1 C (13.8 F)
2019
-10.6 C (12.9 F)
2020
-9.9 C (14.2 F)
2021
-8.9 C (16.0 F)
2022
-9.6 C (14.7 F)
2023
-12.2 C (10.0 F)
2024
-7.8 C (18.0 F)
2025
-6.2 C (20.8 F)
Wettest day (Rx1day)
The wettest day of the year at Muroran, 1951 to 2025. The record is 170.0 mm (6.7 in) in 1975, marked on the chart; the median year is 78.6 mm (3.1 in).
Wettest day (Rx1day) at Muroran by year
Year
Wettest day (Rx1day)
1951
62.4 mm (2.5 in)
1952
64.4 mm (2.5 in)
1953
89.6 mm (3.5 in)
1954
73.8 mm (2.9 in)
1955
61.5 mm (2.4 in)
1956
69.0 mm (2.7 in)
1957
86.1 mm (3.4 in)
1958
74.1 mm (2.9 in)
1959
71.4 mm (2.8 in)
1960
56.0 mm (2.2 in)
1961
99.4 mm (3.9 in)
1962
119.1 mm (4.7 in)
1963
66.5 mm (2.6 in)
1964
100.2 mm (3.9 in)
1965
90.0 mm (3.5 in)
1966
78.6 mm (3.1 in)
1967
66.6 mm (2.6 in)
1968
103.5 mm (4.1 in)
1969
73.5 mm (2.9 in)
1970
95.5 mm (3.8 in)
1971
66.0 mm (2.6 in)
1972
86.0 mm (3.4 in)
1973
106.5 mm (4.2 in)
1974
70.0 mm (2.8 in)
1975
170.0 mm (6.7 in)
1976
101.5 mm (4.0 in)
1977
80.5 mm (3.2 in)
1978
81.0 mm (3.2 in)
1979
79.5 mm (3.1 in)
1980
91.0 mm (3.6 in)
1981
140.5 mm (5.5 in)
1982
58.5 mm (2.3 in)
1983
95.0 mm (3.7 in)
1984
78.5 mm (3.1 in)
1985
60.0 mm (2.4 in)
1986
79.0 mm (3.1 in)
1987
72.0 mm (2.8 in)
1988
87.5 mm (3.4 in)
1989
81.5 mm (3.2 in)
1990
80.0 mm (3.1 in)
1991
73.9 mm (2.9 in)
1992
71.9 mm (2.8 in)
1993
67.1 mm (2.6 in)
1994
83.1 mm (3.3 in)
1995
68.1 mm (2.7 in)
1996
109.5 mm (4.3 in)
1997
78.0 mm (3.1 in)
1998
97.0 mm (3.8 in)
1999
86.1 mm (3.4 in)
2000
71.9 mm (2.8 in)
2001
74.2 mm (2.9 in)
2002
60.2 mm (2.4 in)
2003
80.0 mm (3.1 in)
2004
62.5 mm (2.5 in)
2006
70.6 mm (2.8 in)
2007
41.4 mm (1.6 in)
2008
134.9 mm (5.3 in)
2009
63.5 mm (2.5 in)
2010
165.6 mm (6.5 in)
2011
90.9 mm (3.6 in)
2012
89.9 mm (3.5 in)
2013
68.1 mm (2.7 in)
2014
86.6 mm (3.4 in)
2015
57.4 mm (2.3 in)
2016
72.9 mm (2.9 in)
2017
63.0 mm (2.5 in)
2018
82.5 mm (3.2 in)
2019
58.4 mm (2.3 in)
2020
62.0 mm (2.4 in)
2021
164.1 mm (6.5 in)
2022
82.0 mm (3.2 in)
2023
97.0 mm (3.8 in)
2024
54.6 mm (2.1 in)
2025
45.0 mm (1.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Muroran, 1951 to 2025. The record is 272.0 mm (10.7 in) in 1981, marked on the chart; the median year is 114.7 mm (4.5 in).
Wettest five days (Rx5day) at Muroran by year
Year
Wettest five days (Rx5day)
1951
78.7 mm (3.1 in)
1952
94.8 mm (3.7 in)
1953
127.2 mm (5.0 in)
1954
105.5 mm (4.2 in)
1955
121.4 mm (4.8 in)
1956
125.9 mm (5.0 in)
1957
119.8 mm (4.7 in)
1958
137.5 mm (5.4 in)
1959
112.9 mm (4.4 in)
1960
127.5 mm (5.0 in)
1961
194.0 mm (7.6 in)
1962
137.9 mm (5.4 in)
1963
120.9 mm (4.8 in)
1964
145.6 mm (5.7 in)
1965
133.6 mm (5.3 in)
1966
154.0 mm (6.1 in)
1967
92.7 mm (3.6 in)
1968
181.0 mm (7.1 in)
1969
90.5 mm (3.6 in)
1970
153.5 mm (6.0 in)
1971
131.0 mm (5.2 in)
1972
122.0 mm (4.8 in)
1973
202.5 mm (8.0 in)
1974
100.5 mm (4.0 in)
1975
231.0 mm (9.1 in)
1976
126.5 mm (5.0 in)
1977
148.0 mm (5.8 in)
1978
92.5 mm (3.6 in)
1979
96.0 mm (3.8 in)
1980
255.5 mm (10.1 in)
1981
272.0 mm (10.7 in)
1982
84.5 mm (3.3 in)
1983
164.0 mm (6.5 in)
1984
98.0 mm (3.9 in)
1985
112.5 mm (4.4 in)
1986
123.0 mm (4.8 in)
1987
101.5 mm (4.0 in)
1988
126.0 mm (5.0 in)
1989
139.0 mm (5.5 in)
1990
20.5 mm (0.8 in)
1991
30.7 mm (1.2 in)
1992
14.9 mm (0.6 in)
1993
99.6 mm (3.9 in)
1994
22.5 mm (0.9 in)
1995
128.3 mm (5.1 in)
1996
55.5 mm (2.2 in)
1997
51.2 mm (2.0 in)
1998
42.7 mm (1.7 in)
1999
136.9 mm (5.4 in)
2000
82.7 mm (3.3 in)
2001
94.3 mm (3.7 in)
2002
95.9 mm (3.8 in)
2003
60.5 mm (2.4 in)
2004
77.1 mm (3.0 in)
2006
88.1 mm (3.5 in)
2007
67.2 mm (2.6 in)
2008
163.3 mm (6.4 in)
2009
114.3 mm (4.5 in)
2010
203.7 mm (8.0 in)
2011
128.0 mm (5.0 in)
2012
164.1 mm (6.5 in)
2013
182.6 mm (7.2 in)
2014
142.7 mm (5.6 in)
2015
89.1 mm (3.5 in)
2016
111.7 mm (4.4 in)
2017
74.0 mm (2.9 in)
2018
109.2 mm (4.3 in)
2019
75.9 mm (3.0 in)
2020
91.9 mm (3.6 in)
2021
185.2 mm (7.3 in)
2022
115.0 mm (4.5 in)
2023
122.9 mm (4.8 in)
2024
108.7 mm (4.3 in)
2025
56.4 mm (2.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Muroran, 1951 to 2025. The record is 24 days in 1954, marked on the chart; the median year is 13 days.
Longest dry spell (CDD) at Muroran by year
Year
Longest dry spell (CDD)
1951
13 days
1952
16 days
1953
18 days
1954
24 days
1955
16 days
1956
15 days
1957
14 days
1958
16 days
1959
9 days
1960
13 days
1961
12 days
1962
14 days
1963
13 days
1964
10 days
1965
13 days
1966
11 days
1967
18 days
1968
13 days
1969
12 days
1970
12 days
1971
14 days
1972
14 days
1973
22 days
1974
10 days
1975
15 days
1976
13 days
1977
13 days
1978
20 days
1979
18 days
1980
19 days
1981
17 days
1982
14 days
1983
13 days
1984
24 days
1985
18 days
1986
23 days
1987
16 days
1988
20 days
1989
15 days
1990
3 days
1991
3 days
1992
6 days
1993
4 days
1994
6 days
1995
3 days
1996
6 days
1997
5 days
1998
3 days
1999
8 days
2000
n/a
2001
n/a
2002
6 days
2003
11 days
2004
19 days
2006
22 days
2007
13 days
2008
19 days
2009
18 days
2010
11 days
2011
12 days
2012
14 days
2013
14 days
2014
20 days
2015
13 days
2016
9 days
2017
12 days
2018
13 days
2019
18 days
2020
13 days
2021
12 days
2022
16 days
2023
15 days
2024
11 days
2025
9 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
39 years with a frost
Across 39 years with a frost, the median last spring frost at Muroran falls on 8 April and the median first autumn frost on 15 November, which leaves a median of 221 days between them.
Fitted over all years, the growing season changes by -0.1 days per decade at this station.
Frost dates and growing season at Muroran
Measure
Median, all years
Earliest period
Recent period (1960 to 1989)
Recent against earliest
Fitted trend
Last spring frost
8 April
n/a
9 April
n/a
0.0 days per decade
First autumn frost
15 November
n/a
15 November
n/a
-0.1 days per decade
Growing days
221 days
n/a
219 days
n/a
-0.1 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
56 years, 1951 to 2022
A day with at least 77.8 mm (3.1 in) of rain is expected about once in 2 years. A day with at least 189.9 mm (7.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Muroran: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
77.8 mm (3.1 in)
5 years
99.6 mm (3.9 in)
10 years
116.8 mm (4.6 in)
25 years
142.5 mm (5.6 in)
50 years
164.7 mm (6.5 in)
100 years
189.9 mm (7.5 in)
Longer than the 56 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, 56 years of values from 1951 to 2022.
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: 170.0 mm (6.7 in) in 1975; 165.6 mm (6.5 in) in 2010; 164.1 mm (6.5 in) in 2021.
Download the Data
Data for Muroran standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Muroran 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.