Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Ibukiyama Mtn (Aut). 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 Ibukiyama Mtn (Aut), with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
9.9 C (49.8 F)
-16.2 C (2.8 F)
n/a
n/a
Feb
10.8 C (51.4 F)
-16.5 C (2.3 F)
n/a
n/a
Mar
14.3 C (57.7 F)
-14.1 C (6.6 F)
n/a
n/a
Apr
19.4 C (66.9 F)
-9.8 C (14.4 F)
n/a
n/a
May
23.5 C (74.3 F)
-3.2 C (26.2 F)
n/a
n/a
Jun
25.4 C (77.7 F)
1.9 C (35.4 F)
n/a
n/a
Jul
27.4 C (81.3 F)
6.5 C (43.7 F)
n/a
n/a
Aug
27.2 C (81.0 F)
7.6 C (45.7 F)
n/a
n/a
Sep
25.9 C (78.6 F)
3.2 C (37.8 F)
n/a
n/a
Oct
21.4 C (70.5 F)
-3.5 C (25.7 F)
n/a
n/a
Nov
17.3 C (63.1 F)
-9.4 C (15.1 F)
n/a
n/a
Dec
13.0 C (55.4 F)
-14.6 C (5.7 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Ibukiyama Mtn (Aut) still stand. 1961 holds the most, with 60.
Standing records at Ibukiyama Mtn (Aut) by the year they were set
Year set
Standing records
1951
39
1952
24
1953
27
1954
39
1955
21
1956
45
1957
35
1958
45
1959
53
1960
35
1961
60
1962
20
1963
31
1964
42
1965
32
1966
48
1967
38
1968
40
1969
56
1970
45
1971
26
1972
32
1973
51
1974
18
1975
19
1976
43
1977
40
1978
32
1979
36
1980
57
1981
46
1982
35
1983
41
1984
42
1985
36
1986
24
1987
54
1988
28
1989
29
All-Time Record Progression
1 new records
1 all-time records were set at Ibukiyama Mtn (Aut) between 26 February 1981 and 26 February 1981. Each dot is a new record.
When Ibukiyama Mtn (Aut) set new all-time records
Date
Kind
Detail
1981-02-26
Record low minimum temperature
Record low minimum temperature -16.5 C (2.3 F)
Wettest Day of Each Month
Aug: 232.5 mm (9.2 in)
The wettest day on record for each calendar month at Ibukiyama Mtn (Aut). The most was 232.5 mm (9.2 in) on 12 August 1959.
Record daily precipitation for each month at Ibukiyama Mtn (Aut)
Month
Record daily precipitation (mm)
Date
Jan
46.0 mm (1.8 in)
31 January 1984
Feb
7.0 mm (0.28 in)
3 February 1984
Mar
0.0 mm (0.00 in)
9 March 1983
Apr
99.1 mm (3.9 in)
22 April 1957
May
82.5 mm (3.2 in)
20 May 1985
Jun
125.0 mm (4.9 in)
9 June 1976
Jul
171.7 mm (6.8 in)
23 July 1956
Aug
232.5 mm (9.2 in)
12 August 1959
Sep
210.5 mm (8.3 in)
6 September 1971
Oct
82.6 mm (3.3 in)
6 October 1961
Nov
42.9 mm (1.7 in)
3 November 1959
Dec
48.0 mm (1.9 in)
22 December 1961
Period of Record Coverage
1951 to 1989
Complete yearUnder 90 percent of days
39 years of record at Ibukiyama Mtn (Aut), 1951 to 1989. Every year has data for at least 90 percent of its days.
Cooler than the station meanWarmer than the station mean
One stripe for each of 39 complete years at Ibukiyama Mtn (Aut), 1951 to 1989. Blue stripes are years cooler than the station's own mean of 6.3 C (43.3 F); red stripes are warmer. The coolest year was 1981, at 5.5 C (41.8 F), and the warmest was 1959, at 7.6 C (45.6 F). The strongest colour marks a difference of 1.3 C (2.3 F).
Annual mean temperature at Ibukiyama Mtn (Aut) as warming stripes, 1951 to 1989
Year
Annual mean temperature
Difference from the station mean
1951
6.1 C
-0.17 C
1952
6.5 C
+0.20 C
1953
6.4 C
+0.09 C
1954
6.7 C
+0.42 C
1955
7.1 C
+0.77 C
1956
6.0 C
-0.27 C
1957
6.1 C
-0.21 C
1958
6.8 C
+0.52 C
1959
7.6 C
+1.28 C
1960
6.9 C
+0.65 C
1961
7.1 C
+0.83 C
1962
6.3 C
+0.06 C
1963
6.0 C
-0.28 C
1964
6.7 C
+0.44 C
1965
5.5 C
-0.81 C
1966
6.0 C
-0.30 C
1967
6.3 C
+0.01 C
1968
5.9 C
-0.35 C
1969
6.1 C
-0.16 C
1970
5.8 C
-0.46 C
1971
5.8 C
-0.46 C
1972
6.4 C
+0.15 C
1973
6.1 C
-0.16 C
1974
5.8 C
-0.51 C
1975
6.3 C
0.00 C
1976
5.8 C
-0.49 C
1977
6.7 C
+0.38 C
1978
6.6 C
+0.27 C
1979
7.1 C
+0.81 C
1980
5.7 C
-0.58 C
1981
5.5 C
-0.82 C
1982
6.2 C
-0.11 C
1983
6.2 C
-0.04 C
1984
5.5 C
-0.77 C
1985
6.4 C
+0.14 C
1986
5.7 C
-0.63 C
1987
6.8 C
+0.56 C
1988
5.7 C
-0.57 C
1989
6.9 C
+0.66 C
The fitted trend in annual mean temperature here over 1951 to 1989 is -0.12 C (-0.27 to 0.02) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.22 F (-0.48 to 0.04) 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 Ibukiyama Mtn (Aut)
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.12 C (-0.27 to 0.02) per decade
-0.22 F (-0.48 to 0.04) per decade
1951 to 1989
39
Not clearly different from zero
Mean daily maximum
-0.16 C (-0.32 to 0.01) per decade
-0.28 F (-0.58 to 0.01) per decade
1951 to 1989
39
Not clearly different from zero
Mean daily minimum
-0.09 C (-0.22 to 0.05) per decade
-0.2 F (-0.4 to 0.1) 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 1989
Yearly extremes at Ibukiyama Mtn (Aut): the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
27.4 C (81.3 F)
1951
25.2 C (77.4 F)
39
Coldest night (TNn)
-16.5 C (2.3 F)
1981
-13.5 C (7.7 F)
39
Wettest day (Rx1day)
232.5 mm (9.2 in)
1959
111.0 mm (4.4 in)
39
Wettest five days (Rx5day)
462.4 mm (18.2 in)
1959
221.0 mm (8.7 in)
39
Longest dry spell (CDD)
73 days
1989
11 days
39
Hottest day (TXx)
The hottest day of the year at Ibukiyama Mtn (Aut), 1951 to 1989. The record is 27.4 C (81.3 F) in 1951, marked on the chart; the median year is 25.2 C (77.4 F).
Hottest day (TXx) at Ibukiyama Mtn (Aut) by year
Year
Hottest day (TXx)
1951
27.4 C (81.3 F)
1952
25.8 C (78.4 F)
1953
25.2 C (77.4 F)
1954
24.8 C (76.6 F)
1955
25.6 C (78.1 F)
1956
25.5 C (77.9 F)
1957
25.3 C (77.5 F)
1958
24.2 C (75.6 F)
1959
27.0 C (80.6 F)
1960
25.4 C (77.7 F)
1961
25.8 C (78.4 F)
1962
24.7 C (76.5 F)
1963
24.2 C (75.6 F)
1964
25.0 C (77.0 F)
1965
25.2 C (77.4 F)
1966
25.1 C (77.2 F)
1967
23.7 C (74.7 F)
1968
24.9 C (76.8 F)
1969
23.8 C (74.8 F)
1970
25.4 C (77.7 F)
1971
24.4 C (75.9 F)
1972
25.7 C (78.3 F)
1973
25.8 C (78.4 F)
1974
24.2 C (75.6 F)
1975
25.2 C (77.4 F)
1976
23.4 C (74.1 F)
1977
25.7 C (78.3 F)
1978
25.2 C (77.4 F)
1979
24.9 C (76.8 F)
1980
23.5 C (74.3 F)
1981
24.6 C (76.3 F)
1982
24.4 C (75.9 F)
1983
27.2 C (81.0 F)
1984
25.6 C (78.1 F)
1985
26.3 C (79.3 F)
1986
26.3 C (79.3 F)
1987
25.4 C (77.7 F)
1988
25.3 C (77.5 F)
1989
24.5 C (76.1 F)
Coldest night (TNn)
The coldest night of the year at Ibukiyama Mtn (Aut), 1951 to 1989. The record is -16.5 C (2.3 F) in 1981, marked on the chart; the median year is -13.5 C (7.7 F).
Coldest night (TNn) at Ibukiyama Mtn (Aut) by year
Year
Coldest night (TNn)
1951
-13.5 C (7.7 F)
1952
-12.8 C (9.0 F)
1953
-12.2 C (10.0 F)
1954
-13.4 C (7.9 F)
1955
-13.9 C (7.0 F)
1956
-14.4 C (6.1 F)
1957
-13.5 C (7.7 F)
1958
-13.5 C (7.7 F)
1959
-15.0 C (5.0 F)
1960
-14.6 C (5.7 F)
1961
-14.7 C (5.5 F)
1962
-11.3 C (11.7 F)
1963
-16.2 C (2.8 F)
1964
-12.2 C (10.0 F)
1965
-14.6 C (5.7 F)
1966
-14.2 C (6.4 F)
1967
-16.1 C (3.0 F)
1968
-15.2 C (4.6 F)
1969
-13.6 C (7.5 F)
1970
-13.6 C (7.5 F)
1971
-13.4 C (7.9 F)
1972
-10.9 C (12.4 F)
1973
-13.8 C (7.2 F)
1974
-13.2 C (8.2 F)
1975
-13.6 C (7.5 F)
1976
-12.9 C (8.8 F)
1977
-16.1 C (3.0 F)
1978
-13.5 C (7.7 F)
1979
-11.4 C (11.5 F)
1980
-12.9 C (8.8 F)
1981
-16.5 C (2.3 F)
1982
-13.2 C (8.2 F)
1983
-12.8 C (9.0 F)
1984
-14.8 C (5.4 F)
1985
-13.4 C (7.9 F)
1986
-14.3 C (6.3 F)
1987
-12.0 C (10.4 F)
1988
-12.5 C (9.5 F)
1989
-12.3 C (9.9 F)
Wettest day (Rx1day)
The wettest day of the year at Ibukiyama Mtn (Aut), 1951 to 1989. The record is 232.5 mm (9.2 in) in 1959, marked on the chart; the median year is 111.0 mm (4.4 in).
Wettest day (Rx1day) at Ibukiyama Mtn (Aut) by year
Year
Wettest day (Rx1day)
1951
137.9 mm (5.4 in)
1952
122.1 mm (4.8 in)
1953
131.9 mm (5.2 in)
1954
90.2 mm (3.6 in)
1955
68.4 mm (2.7 in)
1956
171.7 mm (6.8 in)
1957
106.9 mm (4.2 in)
1958
100.5 mm (4.0 in)
1959
232.5 mm (9.2 in)
1960
134.7 mm (5.3 in)
1961
114.9 mm (4.5 in)
1962
122.1 mm (4.8 in)
1963
90.1 mm (3.5 in)
1964
161.4 mm (6.4 in)
1965
193.9 mm (7.6 in)
1966
65.6 mm (2.6 in)
1967
138.5 mm (5.5 in)
1968
129.5 mm (5.1 in)
1969
102.0 mm (4.0 in)
1970
115.0 mm (4.5 in)
1971
210.5 mm (8.3 in)
1972
146.5 mm (5.8 in)
1973
71.0 mm (2.8 in)
1974
108.5 mm (4.3 in)
1975
114.0 mm (4.5 in)
1976
125.0 mm (4.9 in)
1977
54.0 mm (2.1 in)
1978
55.5 mm (2.2 in)
1979
111.0 mm (4.4 in)
1980
74.5 mm (2.9 in)
1981
75.5 mm (3.0 in)
1982
123.5 mm (4.9 in)
1983
106.5 mm (4.2 in)
1984
101.5 mm (4.0 in)
1985
92.5 mm (3.6 in)
1986
94.5 mm (3.7 in)
1987
87.0 mm (3.4 in)
1988
80.0 mm (3.1 in)
1989
153.0 mm (6.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Ibukiyama Mtn (Aut), 1951 to 1989. The record is 462.4 mm (18.2 in) in 1959, marked on the chart; the median year is 221.0 mm (8.7 in).
Wettest five days (Rx5day) at Ibukiyama Mtn (Aut) by year
Year
Wettest five days (Rx5day)
1951
281.6 mm (11.1 in)
1952
300.1 mm (11.8 in)
1953
304.1 mm (12.0 in)
1954
155.1 mm (6.1 in)
1955
216.1 mm (8.5 in)
1956
201.9 mm (7.9 in)
1957
252.1 mm (9.9 in)
1958
156.1 mm (6.1 in)
1959
462.4 mm (18.2 in)
1960
324.2 mm (12.8 in)
1961
315.3 mm (12.4 in)
1962
287.2 mm (11.3 in)
1963
192.9 mm (7.6 in)
1964
286.5 mm (11.3 in)
1965
443.2 mm (17.4 in)
1966
146.0 mm (5.7 in)
1967
193.5 mm (7.6 in)
1968
245.0 mm (9.6 in)
1969
204.0 mm (8.0 in)
1970
229.5 mm (9.0 in)
1971
280.5 mm (11.0 in)
1972
303.0 mm (11.9 in)
1973
131.0 mm (5.2 in)
1974
208.0 mm (8.2 in)
1975
234.0 mm (9.2 in)
1976
400.5 mm (15.8 in)
1977
98.0 mm (3.9 in)
1978
168.0 mm (6.6 in)
1979
272.5 mm (10.7 in)
1980
221.0 mm (8.7 in)
1981
164.0 mm (6.5 in)
1982
195.5 mm (7.7 in)
1983
209.5 mm (8.2 in)
1984
187.5 mm (7.4 in)
1985
241.0 mm (9.5 in)
1986
213.5 mm (8.4 in)
1987
157.0 mm (6.2 in)
1988
159.0 mm (6.3 in)
1989
279.5 mm (11.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Ibukiyama Mtn (Aut), 1951 to 1989. The record is 73 days in 1989, marked on the chart; the median year is 11 days.
Longest dry spell (CDD) at Ibukiyama Mtn (Aut) by year
Year
Longest dry spell (CDD)
1951
16 days
1952
8 days
1953
13 days
1954
12 days
1955
24 days
1956
11 days
1957
9 days
1958
9 days
1959
12 days
1960
13 days
1961
8 days
1962
8 days
1963
10 days
1964
15 days
1965
11 days
1966
11 days
1967
14 days
1968
9 days
1969
8 days
1970
8 days
1971
9 days
1972
10 days
1973
17 days
1974
11 days
1975
12 days
1976
7 days
1977
22 days
1978
8 days
1979
11 days
1980
9 days
1981
14 days
1982
9 days
1983
25 days
1984
19 days
1985
14 days
1986
11 days
1987
14 days
1988
10 days
1989
73 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 Ibukiyama Mtn (Aut) falls on 3 May and the median first autumn frost on 31 October, which leaves a median of 180 days between them.
Fitted over all years, the growing season changes by -2.9 days per decade at this station.
Frost dates and growing season at Ibukiyama Mtn (Aut)
Measure
Median, all years
Earliest period
Recent period (1960 to 1989)
Recent against earliest
Fitted trend
Last spring frost
3 May
n/a
5 May
n/a
+1.0 days per decade
First autumn frost
31 October
n/a
1 November
n/a
-1.9 days per decade
Growing days
180 days
n/a
181 days
n/a
-2.9 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.
Download the Data
Data for Ibukiyama Mtn (Aut) standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ibukiyama Mtn (Aut) 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.