Aikawa Weather Records (JA000047602)

Record envelope, standing records and threshold days for Aikawa (JA000047602), Japan, with 76 years of record.

Key Facts for Aikawa

Aikawa (JA000047602) is a weather station in Japan at 38.03 latitude and 138.23 longitude, 17 m (56 ft) above sea level.
The station reports from 1951 to 2026, 76 years of record.
1,464 records set at Aikawa still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Aikawa set a daily record high minimum temperature of 20.6 C (69.1 F) on 5 October 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

Location: Japan, 38.03 latitude, 138.23 longitude.
Elevation: 17 m (56 ft).
Period of record: 1951 to 2026, 76 years.
Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

6 days at or beyond a record

The band shows the record high and record low for each calendar day at Aikawa. 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 Aikawa, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	16.3 C (61.3 F)	-6.2 C (20.8 F)	13.0 C (55.4 F)	-1.9 C (28.6 F)
Feb	20.7 C (69.3 F)	-5.8 C (21.6 F)	19.0 C (66.2 F)	-4.0 C (24.8 F)
Mar	23.4 C (74.1 F)	-6.4 C (20.5 F)	13.7 C (56.7 F)	0.1 C (32.2 F)
Apr	28.0 C (82.4 F)	-1.8 C (28.8 F)	22.4 C (72.3 F)	5.0 C (41.0 F)
May	30.0 C (86.0 F)	2.6 C (36.7 F)	27.8 C (82.0 F)	10.1 C (50.2 F)
Jun	32.1 C (89.8 F)	8.0 C (46.4 F)	27.6 C (81.7 F)	14.3 C (57.7 F)
Jul	37.4 C (99.3 F)	12.1 C (53.8 F)	33.6 C (92.5 F)	19.1 C (66.4 F)
Aug	38.5 C (101.3 F)	14.6 C (58.3 F)	32.9 C (91.2 F)	19.4 C (66.9 F)
Sep	37.4 C (99.3 F)	10.3 C (50.5 F)	31.2 C (88.2 F)	15.7 C (60.3 F)
Oct	31.5 C (88.7 F)	4.4 C (39.9 F)	23.9 C (75.0 F)	14.6 C (58.3 F)
Nov	24.9 C (76.8 F)	-2.8 C (27.0 F)	n/a	n/a
Dec	20.0 C (68.0 F)	-4.6 C (23.7 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Aikawa still stand. 2025 holds the most, with 58.

Standing records at Aikawa by the year they were set
Year set	Standing records
1951	15
1952	12
1953	19
1954	40
1955	19
1956	37
1957	23
1958	25
1959	13
1960	15
1961	22
1962	10
1963	15
1964	20
1965	32
1966	44
1967	23
1968	17
1969	47
1970	41
1971	35
1972	24
1973	8
1974	32
1975	17
1976	34
1977	31
1978	25
1979	25
1980	19
1981	24
1982	16
1983	26
1984	28
1985	24
1986	26
1987	30
1988	14
1989	15
1990	13
1991	10
1992	10
1993	15
1994	8
1995	2
1996	13
1997	11
1998	16
1999	21
2000	9
2001	11
2002	18
2003	7
2004	16
2006	7
2007	5
2008	4
2009	8
2010	22
2011	11
2012	9
2013	20
2014	8
2015	14
2016	19
2017	10
2018	14
2019	11
2020	20
2021	11
2022	21
2023	26
2024	20
2025	58
2026	24

All-Time Record Progression

10 new records

10 all-time records were set at Aikawa between 6 February 1984 and 4 July 2026. Each dot is a new record.

When Aikawa set new all-time records
Date	Kind	Detail
1984-02-06	Record low maximum temperature	Record low maximum temperature -2.6 C (27.3 F)
1999-08-06	Record high minimum temperature	Record high minimum temperature 28.4 C (83.1 F)
1999-08-07	Record high minimum temperature	Record high minimum temperature 28.9 C (84.0 F)
2002-07-15	Record daily precipitation	Record daily precipitation 240.0 mm (9.4 in)
2018-07-29	Record high maximum temperature	Record high maximum temperature 37.4 C (99.3 F)
2018-08-23	Record high maximum temperature	Record high maximum temperature 37.8 C (100.0 F)
2019-08-15	Record high maximum temperature	Record high maximum temperature 38.1 C (100.6 F)
2023-08-09	Record high maximum temperature	Record high maximum temperature 38.5 C (101.3 F)
2026-07-01	Record daily precipitation	Record daily precipitation 398.5 mm (15.7 in)
2026-07-04	Record daily precipitation	Record daily precipitation 448.5 mm (17.7 in)

Wettest Day of Each Month

Jul: 448.5 mm (17.7 in)

The wettest day on record for each calendar month at Aikawa. The most was 448.5 mm (17.7 in) on 4 July 2026.

Record daily precipitation for each month at Aikawa
Month	Record daily precipitation (mm)	Date
Jan	55.1 mm (2.2 in)	27 January 2002
Feb	42.5 mm (1.7 in)	22 February 1975
Mar	56.5 mm (2.2 in)	30 March 1972
Apr	58.1 mm (2.3 in)	20 April 1952
May	71.5 mm (2.8 in)	16 May 1983
Jun	185.0 mm (7.3 in)	26 June 1978
Jul	448.5 mm (17.7 in)	4 July 2026
Aug	134.1 mm (5.3 in)	4 August 1961
Sep	130.8 mm (5.1 in)	11 September 2012
Oct	102.1 mm (4.0 in)	23 October 2017
Nov	87.9 mm (3.5 in)	11 November 2021
Dec	103.1 mm (4.1 in)	16 December 1993

Period of Record Coverage

1951 to 2026

75 years of record at Aikawa, 1951 to 2026. 34 years have data for under 90 percent of days and are left out of rankings: 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998 and others.

Days with data per year at Aikawa
Year	Days with data	Share of year	Complete
1951	365	100%	Yes
1952	366	100%	Yes
1953	357	98%	Yes
1954	356	98%	Yes
1955	352	96%	Yes
1956	361	99%	Yes
1957	357	98%	Yes
1958	359	98%	Yes
1959	355	97%	Yes
1960	359	98%	Yes
1961	359	98%	Yes
1962	357	98%	Yes
1963	358	98%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	365	100%	Yes
1983	365	100%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	365	100%	Yes
1987	365	100%	Yes
1988	366	100%	Yes
1989	365	100%	Yes
1990	349	96%	Yes
1991	315	86%	No
1992	321	88%	No
1993	321	88%	No
1994	313	86%	No
1995	319	87%	No
1996	302	83%	No
1997	297	81%	No
1998	304	83%	No
1999	296	81%	No
2000	297	81%	No
2001	309	85%	No
2002	304	83%	No
2003	306	84%	No
2004	301	82%	No
2006	301	82%	No
2007	314	86%	No
2008	318	87%	No
2009	299	82%	No
2010	299	82%	No
2011	288	79%	No
2012	229	63%	No
2013	260	71%	No
2014	315	86%	No
2015	313	86%	No
2016	297	81%	No
2017	304	83%	No
2018	295	81%	No
2019	296	81%	No
2020	284	78%	No
2021	295	81%	No
2022	305	84%	No
2023	227	62%	No
2024	253	69%	No
2025	353	97%	Yes
2026	271	74%	No

Latest Records

Latest records at Aikawa
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
5 October 2026	Aikawa, JP	daily high min (Provisional)	20.6 C (69.1 F)	0.5 C (0.9 F)	0 years	8 of 100 (Routine)
4 October 2026	Aikawa, JP	monthly rain (Provisional)	150.0 mm (5.9 in)	47.9 mm (1.9 in)	8 years	59 of 100 (Notable)
29 September 2026	Aikawa, JP	daily rain (Provisional)	63.5 mm (2.5 in)	19.5 mm (0.8 in)	48 years	33 of 100 (Routine)
28 September 2026	Aikawa, JP	monthly rain (Provisional)	314.0 mm (12.4 in)	45.5 mm (1.8 in)	0 years	46 of 100 (Notable)
27 September 2026	Aikawa, JP	daily rain (Provisional)	178.0 mm (7.0 in)	143.5 mm (5.6 in)	65 years	66 of 100 (Major)
20 September 2026	Aikawa, JP	daily high min (Provisional)	22.4 C (72.3 F)	0.2 C (0.4 F)	0 years	7 of 100 (Routine)
14 September 2026	Aikawa, JP	daily rain (Provisional)	185.5 mm (7.3 in)	73.6 mm (2.9 in)	64 years	66 of 100 (Major)
8 September 2026	Aikawa, JP	daily rain (Provisional)	37.0 mm (1.5 in)	7.0 mm (0.28 in)	27 years	19 of 100 (Routine)
4 September 2026	Aikawa, JP	monthly rain (Provisional)	268.5 mm (10.6 in)	25.5 mm (1.0 in)	0 years	33 of 100 (Routine)
3 September 2026	Aikawa, JP	monthly rain (Provisional)	243.0 mm (9.6 in)	112.2 mm (4.4 in)	13 years	61 of 100 (Major)
1 September 2026	Aikawa, JP	daily high min (Provisional)	25.9 C (78.6 F)	0.1 C (0.2 F)	3 years	7 of 100 (Routine)
25 August 2026	Aikawa, JP	daily high min (Provisional)	27.1 C (80.8 F)	0.5 C (0.9 F)	0 years	9 of 100 (Routine)
24 August 2026	Aikawa, JP	daily high min (Provisional)	26.6 C (79.9 F)	0.5 C (0.9 F)	61 years	27 of 100 (Routine)
13 August 2026	Aikawa, JP	daily high min	27.9 C (82.2 F)	2.3 C (4.1 F)	3 years	16 of 100 (Routine)
12 August 2026	Aikawa, JP	daily rain	73.5 mm (2.9 in)	41.5 mm (1.6 in)	24 years	35 of 100 (Notable)
12 August 2026	Aikawa, JP	daily high min	26.9 C (80.4 F)	1.0 C (1.8 F)	4 years	12 of 100 (Routine)
31 July 2026	Aikawa, JP	daily high min (Tie)	25.9 C (78.6 F)	tie	25 years	3 of 100 (Routine)
23 July 2026	Aikawa, JP	daily high min	26.4 C (79.5 F)	0.6 C (1.1 F)	53 years	25 of 100 (Routine)
22 July 2026	Aikawa, JP	daily high min	26.9 C (80.4 F)	0.4 C (0.7 F)	17 years	13 of 100 (Routine)
18 July 2026	Aikawa, JP	daily high min	27.6 C (81.7 F)	2.2 C (4.0 F)	0 years	15 of 100 (Routine)

Climate Trend

40 complete years, 1951 to 2025

One stripe for each of 40 complete years at Aikawa, 1951 to 2025. Blue stripes are years cooler than the station's own mean of 13.2 C (55.7 F); red stripes are warmer. The coolest year was 1976, at 12.2 C (54.0 F), and the warmest was 2025, at 15.4 C (59.8 F). The strongest colour marks a difference of 2.3 C (4.1 F).

Annual mean temperature at Aikawa as warming stripes, 1951 to 2025
Year	Annual mean temperature	Difference from the station mean
1951	13.4 C	+0.22 C
1952	12.9 C	-0.26 C
1953	13.0 C	-0.16 C
1954	13.3 C	+0.17 C
1955	13.9 C	+0.71 C
1956	12.8 C	-0.38 C
1957	13.0 C	-0.14 C
1958	13.3 C	+0.15 C
1959	13.8 C	+0.65 C
1960	13.6 C	+0.47 C
1961	14.0 C	+0.82 C
1962	13.6 C	+0.43 C
1963	13.3 C	+0.12 C
1964	13.1 C	-0.10 C
1965	12.5 C	-0.69 C
1966	12.8 C	-0.37 C
1967	12.8 C	-0.39 C
1968	13.0 C	-0.15 C
1969	12.5 C	-0.69 C
1970	12.7 C	-0.45 C
1971	12.7 C	-0.51 C
1972	13.3 C	+0.10 C
1973	13.4 C	+0.22 C
1974	12.3 C	-0.88 C
1975	13.2 C	+0.07 C
1976	12.2 C	-0.93 C
1977	13.0 C	-0.21 C
1978	13.6 C	+0.43 C
1979	14.0 C	+0.85 C
1980	12.9 C	-0.32 C
1981	12.7 C	-0.48 C
1982	13.5 C	+0.28 C
1983	13.3 C	+0.09 C
1984	12.6 C	-0.60 C
1985	13.3 C	+0.11 C
1986	12.5 C	-0.65 C
1987	13.3 C	+0.16 C
1988	12.7 C	-0.48 C
1989	13.7 C	+0.56 C
2025	15.4 C	+2.25 C

The fitted trend in annual mean temperature here over 1951 to 2025 is 0.11 C (-0.02 to 0.24) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.20 F (-0.04 to 0.44) per decade. The slope is a straight line fitted to 40 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Aikawa
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.11 C (-0.02 to 0.24) per decade	0.20 F (-0.04 to 0.44) per decade	1951 to 2025	40	Not clearly different from zero
Mean daily maximum	0.09 C (-0.04 to 0.21) per decade	0.2 F (-0.1 to 0.4) per decade	1951 to 2025	40	Not clearly different from zero
Mean daily minimum	0.14 C (-0.01 to 0.28) per decade	0.25 F (-0.01 to 0.51) per decade	1951 to 2025	40	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 2026

Yearly extremes at Aikawa: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	38.5 C (101.3 F)	2023	34.3 C (93.7 F)	75
Coldest night (TNn)	-6.4 C (20.5 F)	1971	-3.9 C (25.0 F)	75
Wettest day (Rx1day)	448.5 mm (17.7 in)	2026	78.0 mm (3.1 in)	75
Wettest five days (Rx5day)	1,009.5 mm (39.7 in)	2026	124.9 mm (4.9 in)	75
Longest dry spell (CDD)	35 days	1978	13 days	73

Hottest day (TXx)

The hottest day of the year at Aikawa, 1951 to 2026. The record is 38.5 C (101.3 F) in 2023, marked on the chart; the median year is 34.3 C (93.7 F).

Hottest day (TXx) at Aikawa by year
Year	Hottest day (TXx)
1951	34.4 C (93.9 F)
1952	31.0 C (87.8 F)
1953	32.3 C (90.1 F)
1954	34.8 C (94.6 F)
1955	34.0 C (93.2 F)
1956	34.1 C (93.4 F)
1957	34.8 C (94.6 F)
1958	30.1 C (86.2 F)
1959	31.1 C (88.0 F)
1960	34.1 C (93.4 F)
1961	33.2 C (91.8 F)
1962	34.6 C (94.3 F)
1963	35.4 C (95.7 F)
1964	32.7 C (90.9 F)
1965	34.8 C (94.6 F)
1966	34.0 C (93.2 F)
1967	32.0 C (89.6 F)
1968	34.4 C (93.9 F)
1969	31.6 C (88.9 F)
1970	32.4 C (90.3 F)
1971	35.5 C (95.9 F)
1972	32.8 C (91.0 F)
1973	33.8 C (92.8 F)
1974	33.1 C (91.6 F)
1975	34.0 C (93.2 F)
1976	32.4 C (90.3 F)
1977	32.6 C (90.7 F)
1978	37.0 C (98.6 F)
1979	33.5 C (92.3 F)
1980	34.0 C (93.2 F)
1981	34.8 C (94.6 F)
1982	33.4 C (92.1 F)
1983	33.3 C (91.9 F)
1984	33.4 C (92.1 F)
1985	35.0 C (95.0 F)
1986	35.3 C (95.5 F)
1987	33.2 C (91.8 F)
1988	32.5 C (90.5 F)
1989	34.5 C (94.1 F)
1990	36.0 C (96.8 F)
1991	32.3 C (90.1 F)
1992	33.4 C (92.1 F)
1993	32.2 C (90.0 F)
1994	36.1 C (97.0 F)
1995	34.3 C (93.7 F)
1996	35.5 C (95.9 F)
1997	36.5 C (97.7 F)
1998	34.7 C (94.5 F)
1999	36.5 C (97.7 F)
2000	35.8 C (96.4 F)
2001	34.0 C (93.2 F)
2002	34.9 C (94.8 F)
2003	34.5 C (94.1 F)
2004	36.6 C (97.9 F)
2006	36.7 C (98.1 F)
2007	35.2 C (95.4 F)
2008	32.2 C (90.0 F)
2009	31.0 C (87.8 F)
2010	34.9 C (94.8 F)
2011	35.4 C (95.7 F)
2012	34.7 C (94.5 F)
2013	32.7 C (90.9 F)
2014	33.8 C (92.8 F)
2015	36.9 C (98.4 F)
2016	35.9 C (96.6 F)
2017	34.6 C (94.3 F)
2018	37.8 C (100.0 F)
2019	38.1 C (100.6 F)
2020	37.4 C (99.3 F)
2021	35.7 C (96.3 F)
2022	35.3 C (95.5 F)
2023	38.5 C (101.3 F)
2024	34.3 C (93.7 F)
2025	34.3 C (93.7 F)
2026	33.6 C (92.5 F)

Coldest night (TNn)

The coldest night of the year at Aikawa, 1951 to 2026. The record is -6.4 C (20.5 F) in 1971, marked on the chart; the median year is -3.9 C (25.0 F).

Coldest night (TNn) at Aikawa by year
Year	Coldest night (TNn)
1951	-4.8 C (23.4 F)
1952	-5.3 C (22.5 F)
1953	-3.7 C (25.3 F)
1954	-4.1 C (24.6 F)
1955	-4.7 C (23.5 F)
1956	-4.6 C (23.7 F)
1957	-5.0 C (23.0 F)
1958	-4.0 C (24.8 F)
1959	-4.1 C (24.6 F)
1960	-5.0 C (23.0 F)
1961	-5.0 C (23.0 F)
1962	-4.0 C (24.8 F)
1963	-3.4 C (25.9 F)
1964	-2.9 C (26.8 F)
1965	-4.5 C (23.9 F)
1966	-5.4 C (22.3 F)
1967	-5.5 C (22.1 F)
1968	-4.7 C (23.5 F)
1969	-4.7 C (23.5 F)
1970	-5.0 C (23.0 F)
1971	-6.4 C (20.5 F)
1972	-2.8 C (27.0 F)
1973	-3.4 C (25.9 F)
1974	-5.1 C (22.8 F)
1975	-3.8 C (25.2 F)
1976	-5.1 C (22.8 F)
1977	-5.0 C (23.0 F)
1978	-4.9 C (23.2 F)
1979	-5.1 C (22.8 F)
1980	-3.4 C (25.9 F)
1981	-4.0 C (24.8 F)
1982	-3.9 C (25.0 F)
1983	-4.2 C (24.4 F)
1984	-5.8 C (21.6 F)
1985	-5.2 C (22.6 F)
1986	-4.5 C (23.9 F)
1987	-4.0 C (24.8 F)
1988	-4.3 C (24.3 F)
1989	-2.9 C (26.8 F)
1990	-4.3 C (24.3 F)
1991	-3.8 C (25.2 F)
1992	-2.1 C (28.2 F)
1993	-1.3 C (29.7 F)
1994	-2.5 C (27.5 F)
1995	-3.1 C (26.4 F)
1996	-3.1 C (26.4 F)
1997	-4.5 C (23.9 F)
1998	-2.3 C (27.9 F)
1999	-3.8 C (25.2 F)
2000	-2.9 C (26.8 F)
2001	-3.2 C (26.2 F)
2002	-1.8 C (28.8 F)
2003	-2.9 C (26.8 F)
2004	-2.1 C (28.2 F)
2006	-4.1 C (24.6 F)
2007	-2.3 C (27.9 F)
2008	-2.4 C (27.7 F)
2009	-1.9 C (28.6 F)
2010	-2.7 C (27.1 F)
2011	-2.8 C (27.0 F)
2012	-3.9 C (25.0 F)
2013	-3.6 C (25.5 F)
2014	-3.9 C (25.0 F)
2015	-3.6 C (25.5 F)
2016	-1.7 C (28.9 F)
2017	-3.4 C (25.9 F)
2018	-4.7 C (23.5 F)
2019	-1.6 C (29.1 F)
2020	-3.1 C (26.4 F)
2021	-2.6 C (27.3 F)
2022	-2.0 C (28.4 F)
2023	-6.2 C (20.8 F)
2024	-2.2 C (28.0 F)
2025	-2.0 C (28.4 F)
2026	-4.0 C (24.8 F)

Wettest day (Rx1day)

The wettest day of the year at Aikawa, 1951 to 2026. The record is 448.5 mm (17.7 in) in 2026, marked on the chart; the median year is 78.0 mm (3.1 in).

Wettest day (Rx1day) at Aikawa by year
Year	Wettest day (Rx1day)
1951	61.7 mm (2.4 in)
1952	80.3 mm (3.2 in)
1953	105.8 mm (4.2 in)
1954	49.3 mm (1.9 in)
1955	105.0 mm (4.1 in)
1956	74.1 mm (2.9 in)
1957	48.7 mm (1.9 in)
1958	69.5 mm (2.7 in)
1959	62.5 mm (2.5 in)
1960	99.8 mm (3.9 in)
1961	134.1 mm (5.3 in)
1962	49.3 mm (1.9 in)
1963	47.4 mm (1.9 in)
1964	109.3 mm (4.3 in)
1965	64.1 mm (2.5 in)
1966	67.2 mm (2.6 in)
1967	67.4 mm (2.7 in)
1968	82.5 mm (3.2 in)
1969	55.0 mm (2.2 in)
1970	78.0 mm (3.1 in)
1971	93.0 mm (3.7 in)
1972	117.5 mm (4.6 in)
1973	92.5 mm (3.6 in)
1974	60.5 mm (2.4 in)
1975	51.5 mm (2.0 in)
1976	42.5 mm (1.7 in)
1977	53.5 mm (2.1 in)
1978	185.0 mm (7.3 in)
1979	101.5 mm (4.0 in)
1980	76.5 mm (3.0 in)
1981	91.0 mm (3.6 in)
1982	69.5 mm (2.7 in)
1983	83.0 mm (3.3 in)
1984	80.0 mm (3.1 in)
1985	76.0 mm (3.0 in)
1986	53.0 mm (2.1 in)
1987	103.5 mm (4.1 in)
1988	57.5 mm (2.3 in)
1989	44.0 mm (1.7 in)
1990	120.9 mm (4.8 in)
1991	57.9 mm (2.3 in)
1992	52.6 mm (2.1 in)
1993	103.1 mm (4.1 in)
1994	71.1 mm (2.8 in)
1995	101.1 mm (4.0 in)
1996	43.9 mm (1.7 in)
1997	118.1 mm (4.6 in)
1998	121.9 mm (4.8 in)
1999	130.0 mm (5.1 in)
2000	50.0 mm (2.0 in)
2001	83.8 mm (3.3 in)
2002	240.0 mm (9.4 in)
2003	68.1 mm (2.7 in)
2004	111.0 mm (4.4 in)
2006	62.0 mm (2.4 in)
2007	53.1 mm (2.1 in)
2008	90.9 mm (3.6 in)
2009	85.1 mm (3.4 in)
2010	73.2 mm (2.9 in)
2011	99.1 mm (3.9 in)
2012	134.9 mm (5.3 in)
2013	101.1 mm (4.0 in)
2014	102.1 mm (4.0 in)
2015	53.1 mm (2.1 in)
2016	87.1 mm (3.4 in)
2017	115.1 mm (4.5 in)
2018	69.1 mm (2.7 in)
2019	56.9 mm (2.2 in)
2020	80.0 mm (3.1 in)
2021	87.9 mm (3.5 in)
2022	72.9 mm (2.9 in)
2023	47.0 mm (1.9 in)
2024	88.9 mm (3.5 in)
2025	36.0 mm (1.4 in)
2026	448.5 mm (17.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at Aikawa, 1951 to 2026. The record is 1,009.5 mm (39.7 in) in 2026, marked on the chart; the median year is 124.9 mm (4.9 in).

Wettest five days (Rx5day) at Aikawa by year
Year	Wettest five days (Rx5day)
1951	114.9 mm (4.5 in)
1952	124.9 mm (4.9 in)
1953	183.1 mm (7.2 in)
1954	79.6 mm (3.1 in)
1955	182.6 mm (7.2 in)
1956	173.9 mm (6.8 in)
1957	88.2 mm (3.5 in)
1958	219.1 mm (8.6 in)
1959	114.1 mm (4.5 in)
1960	130.7 mm (5.1 in)
1961	191.2 mm (7.5 in)
1962	75.4 mm (3.0 in)
1963	96.2 mm (3.8 in)
1964	194.3 mm (7.6 in)
1965	114.0 mm (4.5 in)
1966	154.9 mm (6.1 in)
1967	141.9 mm (5.6 in)
1968	172.0 mm (6.8 in)
1969	148.0 mm (5.8 in)
1970	133.0 mm (5.2 in)
1971	179.0 mm (7.0 in)
1972	137.5 mm (5.4 in)
1973	108.5 mm (4.3 in)
1974	127.5 mm (5.0 in)
1975	77.0 mm (3.0 in)
1976	105.0 mm (4.1 in)
1977	82.5 mm (3.2 in)
1978	330.5 mm (13.0 in)
1979	106.0 mm (4.2 in)
1980	132.0 mm (5.2 in)
1981	161.5 mm (6.4 in)
1982	135.5 mm (5.3 in)
1983	108.5 mm (4.3 in)
1984	122.5 mm (4.8 in)
1985	109.0 mm (4.3 in)
1986	81.0 mm (3.2 in)
1987	120.5 mm (4.7 in)
1988	79.5 mm (3.1 in)
1989	140.0 mm (5.5 in)
1990	54.5 mm (2.1 in)
1991	66.9 mm (2.6 in)
1992	62.7 mm (2.5 in)
1993	128.2 mm (5.0 in)
1994	57.7 mm (2.3 in)
1995	135.7 mm (5.3 in)
1996	77.7 mm (3.1 in)
1997	74.7 mm (2.9 in)
1998	117.6 mm (4.6 in)
1999	153.4 mm (6.0 in)
2000	50.4 mm (2.0 in)
2001	54.3 mm (2.1 in)
2002	131.6 mm (5.2 in)
2003	64.7 mm (2.5 in)
2004	116.1 mm (4.6 in)
2006	154.8 mm (6.1 in)
2007	85.0 mm (3.3 in)
2008	112.4 mm (4.4 in)
2009	111.1 mm (4.4 in)
2010	196.4 mm (7.7 in)
2011	195.2 mm (7.7 in)
2012	166.9 mm (6.6 in)
2013	153.5 mm (6.0 in)
2014	143.5 mm (5.6 in)
2015	70.6 mm (2.8 in)
2016	112.8 mm (4.4 in)
2017	220.5 mm (8.7 in)
2018	162.8 mm (6.4 in)
2019	105.5 mm (4.2 in)
2020	165.1 mm (6.5 in)
2021	161.8 mm (6.4 in)
2022	138.5 mm (5.5 in)
2023	92.2 mm (3.6 in)
2024	147.8 mm (5.8 in)
2025	116.5 mm (4.6 in)
2026	1,009.5 mm (39.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Aikawa, 1951 to 2026. The record is 35 days in 1978, marked on the chart; the median year is 13 days.

Longest dry spell (CDD) at Aikawa by year
Year	Longest dry spell (CDD)
1951	15 days
1952	14 days
1953	11 days
1954	18 days
1955	12 days
1956	10 days
1957	10 days
1958	10 days
1959	15 days
1960	18 days
1961	13 days
1962	17 days
1963	17 days
1964	17 days
1965	12 days
1966	12 days
1967	20 days
1968	14 days
1969	11 days
1970	13 days
1971	12 days
1972	11 days
1973	18 days
1974	12 days
1975	19 days
1976	15 days
1977	20 days
1978	35 days
1979	15 days
1980	21 days
1981	12 days
1982	22 days
1983	19 days
1984	26 days
1985	24 days
1986	12 days
1987	15 days
1988	12 days
1989	20 days
1990	3 days
1991	4 days
1992	4 days
1993	3 days
1994	4 days
1995	3 days
1996	3 days
1997	3 days
1998	4 days
1999	9 days
2000	n/a
2001	n/a
2002	3 days
2003	5 days
2004	22 days
2006	13 days
2007	10 days
2008	15 days
2009	12 days
2010	17 days
2011	13 days
2012	7 days
2013	13 days
2014	24 days
2015	15 days
2016	18 days
2017	14 days
2018	24 days
2019	10 days
2020	17 days
2021	14 days
2022	12 days
2023	13 days
2024	17 days
2025	17 days
2026	25 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

35 years with a frost

Across 35 years with a frost, the median last spring frost at Aikawa falls on 26 March and the median first autumn frost on 17 December, which leaves a median of 265 days between them.

Fitted over all years, the growing season changes by +3.1 days per decade at this station.

Frost dates and growing season at Aikawa
Measure	Median, all years	Earliest period	Recent period (1956 to 2025)	Recent against earliest	Fitted trend
Last spring frost	26 March	n/a	27 March	n/a	-2.5 days per decade
First autumn frost	17 December	n/a	17 December	n/a	+0.6 days per decade
Growing days	265 days	n/a	264 days	n/a	+3.1 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

52 years, 1951 to 2022

A day with at least 74.6 mm (2.9 in) of rain is expected about once in 2 years. A day with at least 164.4 mm (6.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Aikawa: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	74.6 mm (2.9 in)
5 years	98.1 mm (3.9 in)
10 years	113.9 mm (4.5 in)
25 years	134.1 mm (5.3 in)
50 years	149.2 mm (5.9 in)
100 years	164.4 mm (6.5 in)	Longer than the 52 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, 52 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: 185.0 mm (7.3 in) in 1978; 134.1 mm (5.3 in) in 1961; 117.5 mm (4.6 in) in 1972.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Download the Data

Data for Aikawa standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Aikawa 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 2026-10-12 (12 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-13. Last revised 13 October 2026 (2026-10-13).