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Chichibu Weather Records (JA000047641)

Record envelope, standing records and threshold days for Chichibu (JA000047641), Japan, with 76 years of record.

Key Facts for Chichibu

  • Chichibu (JA000047641) is a weather station in Japan at 35.98 latitude and 139.07 longitude, 234 m (768 ft) above sea level.
  • The station reports from 1951 to 2026, 76 years of record.
  • 1,464 records set at Chichibu still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • Chichibu set a daily record high minimum temperature of 18.8 C (65.8 F) on 6 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, 35.98 latitude, 139.07 longitude.
  • Elevation: 234 m (768 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
Daily record high and record low at Chichibu, with 2026 drawn through them The band shows the record high and record low for each calendar day at Chichibu. The lines show the 2026 daily maximum and minimum. 6 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -2002040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Chichibu. 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 Chichibu, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan23.0 C (73.4 F)-15.8 C (3.6 F)18.2 C (64.8 F)-8.2 C (17.2 F)
Feb26.6 C (79.9 F)-12.3 C (9.9 F)24.1 C (75.4 F)-6.2 C (20.8 F)
Mar26.9 C (80.4 F)-12.5 C (9.5 F)19.0 C (66.2 F)-3.0 C (26.6 F)
Apr33.0 C (91.4 F)-5.4 C (22.3 F)26.9 C (80.4 F)2.2 C (36.0 F)
May37.2 C (99.0 F)-0.8 C (30.6 F)32.0 C (89.6 F)6.7 C (44.1 F)
Jun38.4 C (101.1 F)5.9 C (42.6 F)33.5 C (92.3 F)13.2 C (55.8 F)
Jul39.2 C (102.6 F)9.1 C (48.4 F)38.0 C (100.4 F)17.4 C (63.3 F)
Aug39.3 C (102.7 F)10.8 C (51.4 F)35.5 C (95.9 F)18.9 C (66.0 F)
Sep38.0 C (100.4 F)6.1 C (43.0 F)31.6 C (88.9 F)16.9 C (62.4 F)
Oct32.4 C (90.3 F)-0.4 C (31.3 F)29.9 C (85.8 F)12.1 C (53.8 F)
Nov26.5 C (79.7 F)-6.5 C (20.3 F)n/an/a
Dec25.1 C (77.2 F)-11.4 C (11.5 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Chichibu by the year they were set 1,464 records at Chichibu still stand. 2025 holds the most, with 58. 02040601951: 171952: 191953: 281954: 431955: 201956: 291957: 271958: 271959: 211960: 201961: 201962: 191963: 291964: 241965: 301966: 311967: 211968: 281969: 381970: 261971: 251972: 191973: 281974: 221975: 221976: 331977: 181978: 191979: 171980: 251981: 201982: 201983: 141984: 241985: 251986: 131987: 251988: 201989: 171991: 131992: 121993: 221994: 71995: 71996: 81997: 121998: 121999: 62000: 42001: 112002: 162003: 172004: 182005: 102006: 72007: 32008: 82009: 92010: 272011: 152012: 62013: 182014: 62015: 92016: 192017: 102018: 272019: 192020: 142021: 112022: 162023: 272024: 262025: 582026: 311951195919671975198319922000200820162024
1,464 records at Chichibu still stand. 2025 holds the most, with 58.
Standing records at Chichibu by the year they were set
Year setStanding records
195117
195219
195328
195443
195520
195629
195727
195827
195921
196020
196120
196219
196329
196424
196530
196631
196721
196828
196938
197026
197125
197219
197328
197422
197522
197633
197718
197819
197917
198025
198120
198220
198314
198424
198525
198613
198725
198820
198917
199113
199212
199322
19947
19957
19968
199712
199812
19996
20004
200111
200216
200317
200418
200510
20067
20073
20088
20099
201027
201115
20126
201318
20146
20159
201619
201710
201827
201919
202014
202111
202216
202327
202426
202558
202631

All-Time Record Progression

7 new records
When Chichibu set new all-time records 7 all-time records were set at Chichibu between 12 September 1982 and 22 July 2026. Each dot is a new record. Record daily precipitationRecord high maximum temperatureRecord high minimum temperature12 September 1982: Record daily precipitation 294.0 mm (11.6 in)3 September 1984: Record high maximum temperature 38.0 C (100.4 F)7 August 1994: Record high maximum temperature 39.3 C (102.7 F)18 July 2018: Record high minimum temperature 25.5 C (77.9 F)7 July 2025: Record high minimum temperature 25.9 C (78.6 F)5 August 2025: Record high minimum temperature 26.5 C (79.7 F)22 July 2026: Record high minimum temperature 26.9 C (80.4 F)1990200020102020
7 all-time records were set at Chichibu between 12 September 1982 and 22 July 2026. Each dot is a new record.
When Chichibu set new all-time records
DateKindDetail
1982-09-12Record daily precipitationRecord daily precipitation 294.0 mm (11.6 in)
1984-09-03Record high maximum temperatureRecord high maximum temperature 38.0 C (100.4 F)
1994-08-07Record high maximum temperatureRecord high maximum temperature 39.3 C (102.7 F)
2018-07-18Record high minimum temperatureRecord high minimum temperature 25.5 C (77.9 F)
2025-07-07Record high minimum temperatureRecord high minimum temperature 25.9 C (78.6 F)
2025-08-05Record high minimum temperatureRecord high minimum temperature 26.5 C (79.7 F)
2026-07-22Record high minimum temperatureRecord high minimum temperature 26.9 C (80.4 F)

Wettest Day of Each Month

Sep: 294.0 mm (11.6 in)
Record daily precipitation for each month at Chichibu The wettest day on record for each calendar month at Chichibu. The most was 294.0 mm (11.6 in) on 12 September 1982. 0100200300 Jan: 73.5 mm (2.9 in), 11 January 1972 Jan Feb: 83.1 mm (3.3 in), 15 February 2014 Feb Mar: 89.5 mm (3.5 in), 23 March 1986 Mar Apr: 124.0 mm (4.9 in), 11 April 1999 Apr May: 100.8 mm (4.0 in), 3 May 2012 May Jun: 233.3 mm (9.2 in), 28 June 1966 Jun Jul: 213.9 mm (8.4 in), 26 July 2005 Jul Aug: 263.0 mm (10.4 in), 31 August 1971 Aug Sep: 294.0 mm (11.6 in), 12 September 1982 Sep Oct: 216.2 mm (8.5 in), 6 October 2006 Oct Nov: 70.7 mm (2.8 in), 21 November 1955 Nov Dec: 83.1 mm (3.3 in), 26 December 2006 Dec
The wettest day on record for each calendar month at Chichibu. The most was 294.0 mm (11.6 in) on 12 September 1982.
Record daily precipitation for each month at Chichibu
MonthRecord daily precipitation (mm)Date
Jan73.5 mm (2.9 in)11 January 1972
Feb83.1 mm (3.3 in)15 February 2014
Mar89.5 mm (3.5 in)23 March 1986
Apr124.0 mm (4.9 in)11 April 1999
May100.8 mm (4.0 in)3 May 2012
Jun233.3 mm (9.2 in)28 June 1966
Jul213.9 mm (8.4 in)26 July 2005
Aug263.0 mm (10.4 in)31 August 1971
Sep294.0 mm (11.6 in)12 September 1982
Oct216.2 mm (8.5 in)6 October 2006
Nov70.7 mm (2.8 in)21 November 1955
Dec83.1 mm (3.3 in)26 December 2006

Period of Record Coverage

1951 to 2026
Days with data per year at Chichibu 76 years of record at Chichibu, 1951 to 2026. 8 years have data for under 90 percent of days and are left out of rankings: 1990, 1991, 1997, 2001, 2020, 2023, 2024, 2026. 1951: 365 of 365 days1952: 366 of 366 days1953: 364 of 365 days1954: 364 of 365 days1955: 364 of 365 days1956: 365 of 366 days1957: 365 of 365 days1958: 365 of 365 days1959: 365 of 365 days1960: 366 of 366 days1961: 364 of 365 days1962: 365 of 365 days1963: 362 of 365 days1964: 366 of 366 days1965: 365 of 365 days1966: 365 of 365 days1967: 365 of 365 days1968: 366 of 366 days1969: 365 of 365 days1970: 365 of 365 days1971: 365 of 365 days1972: 366 of 366 days1973: 365 of 365 days1974: 365 of 365 days1975: 365 of 365 days1976: 366 of 366 days1977: 365 of 365 days1978: 365 of 365 days1979: 365 of 365 days1980: 366 of 366 days1981: 365 of 365 days1982: 365 of 365 days1983: 365 of 365 days1984: 366 of 366 days1985: 365 of 365 days1986: 365 of 365 days1987: 365 of 365 days1988: 366 of 366 days1989: 365 of 365 days1990: 6 of 365 days1991: 272 of 365 days1992: 354 of 366 days1993: 351 of 365 days1994: 351 of 365 days1995: 338 of 365 days1996: 354 of 366 days1997: 322 of 365 days1998: 344 of 365 days1999: 329 of 365 days2000: 347 of 366 days2001: 301 of 365 days2002: 335 of 365 days2003: 346 of 365 days2004: 338 of 366 days2005: 357 of 365 days2006: 348 of 365 days2007: 353 of 365 days2008: 357 of 366 days2009: 353 of 365 days2010: 355 of 365 days2011: 354 of 365 days2012: 360 of 366 days2013: 353 of 365 days2014: 354 of 365 days2015: 352 of 365 days2016: 353 of 366 days2017: 352 of 365 days2018: 349 of 365 days2019: 346 of 365 days2020: 320 of 366 days2021: 340 of 365 days2022: 346 of 365 days2023: 266 of 365 days2024: 297 of 366 days2025: 356 of 365 days2026: 271 of 365 days1960197019801990200020102020
76 years of record at Chichibu, 1951 to 2026. 8 years have data for under 90 percent of days and are left out of rankings: 1990, 1991, 1997, 2001, 2020, 2023, 2024, 2026.
Days with data per year at Chichibu
YearDays with dataShare of yearComplete
1951365100%Yes
1952366100%Yes
1953364100%Yes
1954364100%Yes
1955364100%Yes
1956365100%Yes
1957365100%Yes
1958365100%Yes
1959365100%Yes
1960366100%Yes
1961364100%Yes
1962365100%Yes
196336299%Yes
1964366100%Yes
1965365100%Yes
1966365100%Yes
1967365100%Yes
1968366100%Yes
1969365100%Yes
1970365100%Yes
1971365100%Yes
1972366100%Yes
1973365100%Yes
1974365100%Yes
1975365100%Yes
1976366100%Yes
1977365100%Yes
1978365100%Yes
1979365100%Yes
1980366100%Yes
1981365100%Yes
1982365100%Yes
1983365100%Yes
1984366100%Yes
1985365100%Yes
1986365100%Yes
1987365100%Yes
1988366100%Yes
1989365100%Yes
199062%No
199127275%No
199235497%Yes
199335196%Yes
199435196%Yes
199533893%Yes
199635497%Yes
199732288%No
199834494%Yes
199932990%Yes
200034795%Yes
200130182%No
200233592%Yes
200334695%Yes
200433892%Yes
200535798%Yes
200634895%Yes
200735397%Yes
200835798%Yes
200935397%Yes
201035597%Yes
201135497%Yes
201236098%Yes
201335397%Yes
201435497%Yes
201535296%Yes
201635396%Yes
201735296%Yes
201834996%Yes
201934695%Yes
202032087%No
202134093%Yes
202234695%Yes
202326673%No
202429781%No
202535698%Yes
202627174%No

Latest Records

20
Latest records at Chichibu
DateStationRecordValueBeat old record byOld record stoodSignificance
6 October 2026Chichibu, JPdaily high min (Provisional)18.8 C (65.8 F)1.1 C (2.0 F)12 years12 of 100 (Routine)
21 September 2026Chichibu, JPdaily rain (Provisional)254.5 mm (10.0 in)120.6 mm (4.7 in)15 years50 of 100 (Notable)
15 September 2026Chichibu, JPdaily rain (Provisional)231.5 mm (9.1 in)139.3 mm (5.5 in)59 years64 of 100 (Major)
14 September 2026Chichibu, JPdaily rain (Provisional)124.5 mm (4.9 in)52.6 mm (2.1 in)29 years32 of 100 (Routine)
13 September 2026Chichibu, JPdaily rain (Provisional)60.0 mm (2.4 in)21.6 mm (0.9 in)69 years34 of 100 (Routine)
7 September 2026Chichibu, JPdaily rain (Provisional)257.5 mm (10.1 in)218.5 mm (8.6 in)55 years63 of 100 (Major)
28 August 2026Chichibu, JPdaily rain (Provisional)129.0 mm (5.1 in)29.0 mm (1.1 in)63 years34 of 100 (Routine)
26 August 2026Chichibu, JPdaily high min (Provisional)24.6 C (76.3 F)0.6 C (1.1 F)64 years29 of 100 (Routine)
11 August 2026Chichibu, JPdaily rain55.5 mm (2.2 in)21.0 mm (0.8 in)37 years24 of 100 (Routine)
8 August 2026Chichibu, JPdaily high min24.6 C (76.3 F)0.6 C (1.1 F)69 years30 of 100 (Routine)
7 August 2026Chichibu, JPdaily high min24.8 C (76.6 F)0.6 C (1.1 F)5 years11 of 100 (Routine)
1 August 2026Chichibu, JPdaily high min25.4 C (77.7 F)1.1 C (2.0 F)64 years31 of 100 (Routine)
31 July 2026Chichibu, JPdaily rain101.5 mm (4.0 in)51.5 mm (2.0 in)15 years39 of 100 (Notable)
31 July 2026Chichibu, JPdaily high min24.4 C (75.9 F)0.4 C (0.7 F)71 years29 of 100 (Routine)
30 July 2026Chichibu, JPdaily high min25.2 C (77.4 F)1.1 C (2.0 F)75 years34 of 100 (Routine)
28 July 2026Chichibu, JPdaily rain154.0 mm (6.1 in)29.0 mm (1.1 in)8 years24 of 100 (Routine)
25 July 2026Chichibu, JPdaily rain155.5 mm (6.1 in)107.5 mm (4.2 in)5 years48 of 100 (Notable)
25 July 2026Chichibu, JPdaily high min24.4 C (75.9 F)0.5 C (0.9 F)11 years12 of 100 (Routine)
24 July 2026Chichibu, JPdaily high min24.6 C (76.3 F)0.2 C (0.4 F)48 years21 of 100 (Routine)
24 July 2026Chichibu, JPdaily rain31.5 mm (1.2 in)0.5 mm (0.02 in)16 years11 of 100 (Routine)

Climate Trend

40 complete years, 1951 to 2025
Annual mean temperature at Chichibu as warming stripes, 1951 to 2025 One stripe for each of 40 complete years at Chichibu, 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 (59.7 F). The strongest colour marks a difference of 2.2 C (4.0 F). 1951: 13.3 C, +0.1 C from the station mean1952: 13.3 C, +0.2 C from the station mean1953: 13.1 C, -0.1 C from the station mean1954: 13.3 C, +0.1 C from the station mean1955: 14.0 C, +0.8 C from the station mean1956: 13.3 C, +0.1 C from the station mean1957: 13.0 C, -0.2 C from the station mean1958: 13.6 C, +0.4 C from the station mean1959: 13.9 C, +0.7 C from the station mean1960: 13.7 C, +0.5 C from the station mean1961: 14.2 C, +1.0 C from the station mean1962: 13.3 C, +0.2 C from the station mean1963: 13.1 C, -0.1 C from the station mean1964: 13.2 C, 0.0 C from the station mean1965: 12.5 C, -0.7 C from the station mean1966: 13.0 C, -0.2 C from the station mean1967: 13.2 C, 0.0 C from the station mean1968: 12.9 C, -0.3 C from the station mean1969: 12.9 C, -0.3 C from the station mean1970: 12.7 C, -0.5 C from the station mean1971: 12.9 C, -0.3 C from the station mean1972: 13.3 C, +0.1 C from the station mean1973: 13.3 C, +0.1 C from the station mean1974: 12.4 C, -0.8 C from the station mean1975: 12.8 C, -0.4 C from the station mean1976: 12.2 C, -1.0 C from the station mean1977: 13.1 C, -0.1 C from the station mean1978: 13.1 C, -0.1 C from the station mean1979: 13.9 C, +0.7 C from the station mean1980: 12.7 C, -0.5 C from the station mean1981: 12.4 C, -0.8 C from the station mean1982: 13.1 C, -0.1 C from the station mean1983: 12.9 C, -0.3 C from the station mean1984: 12.4 C, -0.8 C from the station mean1985: 13.1 C, 0.0 C from the station mean1986: 12.5 C, -0.7 C from the station mean1987: 13.9 C, +0.7 C from the station mean1988: 12.8 C, -0.4 C from the station mean1989: 13.7 C, +0.5 C from the station mean2025: 15.4 C, +2.2 C from the station mean19511960197019801990200020102020
One stripe for each of 40 complete years at Chichibu, 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 (59.7 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Chichibu as warming stripes, 1951 to 2025
YearAnnual mean temperatureDifference from the station mean
195113.3 C+0.07 C
195213.3 C+0.16 C
195313.1 C-0.08 C
195413.3 C+0.12 C
195514.0 C+0.82 C
195613.3 C+0.09 C
195713.0 C-0.20 C
195813.6 C+0.39 C
195913.9 C+0.73 C
196013.7 C+0.52 C
196114.2 C+0.98 C
196213.3 C+0.16 C
196313.1 C-0.06 C
196413.2 C+0.05 C
196512.5 C-0.69 C
196613.0 C-0.22 C
196713.2 C+0.02 C
196812.9 C-0.27 C
196912.9 C-0.29 C
197012.7 C-0.49 C
197112.9 C-0.27 C
197213.3 C+0.07 C
197313.3 C+0.10 C
197412.4 C-0.75 C
197512.8 C-0.43 C
197612.2 C-0.98 C
197713.1 C-0.13 C
197813.1 C-0.07 C
197913.9 C+0.75 C
198012.7 C-0.49 C
198112.4 C-0.76 C
198213.1 C-0.07 C
198312.9 C-0.27 C
198412.4 C-0.83 C
198513.1 C-0.04 C
198612.5 C-0.66 C
198713.9 C+0.71 C
198812.8 C-0.38 C
198913.7 C+0.52 C
202515.4 C+2.19 C

The fitted trend in annual mean temperature here over 1951 to 2025 is 0.1 C (-0.1 to 0.2) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.1 to 0.4) 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 Chichibu
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.1 C (-0.1 to 0.2) per decade0.1 F (-0.1 to 0.4) per decade1951 to 202540Not clearly different from zero
Mean daily maximum0.02 C (-0.12 to 0.15) per decade0.03 F (-0.22 to 0.27) per decade1951 to 202540Not clearly different from zero
Mean daily minimum0.11 C (-0.04 to 0.27) per decade0.2 F (-0.1 to 0.5) per decade1951 to 202540Not 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 Chichibu: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)39.3 C (102.7 F)199436.6 C (97.9 F)76
Coldest night (TNn)-15.8 C (3.6 F)1954-9.0 C (15.8 F)76
Wettest day (Rx1day)294.0 mm (11.6 in)1982107.7 mm (4.2 in)76
Wettest five days (Rx5day)498.0 mm (19.6 in)2026149.5 mm (5.9 in)67
Longest dry spell (CDD)56 days197824 days72

Hottest day (TXx)

Hottest day (TXx) at Chichibu by year The hottest day of the year at Chichibu, 1951 to 2026. The record is 39.3 C (102.7 F) in 1994, marked on the chart; the median year is 36.6 C (97.9 F). 3032343638401960198020002020Record: 39.3 C (102.7 F) in 1994
The hottest day of the year at Chichibu, 1951 to 2026. The record is 39.3 C (102.7 F) in 1994, marked on the chart; the median year is 36.6 C (97.9 F).
Hottest day (TXx) at Chichibu by year
YearHottest day (TXx)
195136.8 C (98.2 F)
195236.1 C (97.0 F)
195335.8 C (96.4 F)
195436.0 C (96.8 F)
195535.2 C (95.4 F)
195637.2 C (99.0 F)
195734.4 C (93.9 F)
195835.7 C (96.3 F)
195935.7 C (96.3 F)
196036.5 C (97.7 F)
196136.7 C (98.1 F)
196236.7 C (98.1 F)
196336.0 C (96.8 F)
196435.5 C (95.9 F)
196536.0 C (96.8 F)
196637.4 C (99.3 F)
196735.7 C (96.3 F)
196835.4 C (95.7 F)
196936.0 C (96.8 F)
197036.7 C (98.1 F)
197135.8 C (96.4 F)
197234.8 C (94.6 F)
197337.3 C (99.1 F)
197433.9 C (93.0 F)
197535.8 C (96.4 F)
197634.5 C (94.1 F)
197735.4 C (95.7 F)
197836.6 C (97.9 F)
197934.9 C (94.8 F)
198034.2 C (93.6 F)
198135.1 C (95.2 F)
198234.5 C (94.1 F)
198334.9 C (94.8 F)
198438.0 C (100.4 F)
198536.5 C (97.7 F)
198634.7 C (94.5 F)
198738.0 C (100.4 F)
198834.4 C (93.9 F)
198934.0 C (93.2 F)
199031.3 C (88.3 F)
199137.7 C (99.9 F)
199236.4 C (97.5 F)
199337.2 C (99.0 F)
199439.3 C (102.7 F)
199537.6 C (99.7 F)
199638.3 C (100.9 F)
199739.1 C (102.4 F)
199836.8 C (98.2 F)
199936.3 C (97.3 F)
200037.4 C (99.3 F)
200138.7 C (101.7 F)
200237.8 C (100.0 F)
200335.9 C (96.6 F)
200438.1 C (100.6 F)
200535.8 C (96.4 F)
200637.0 C (98.6 F)
200738.1 C (100.6 F)
200836.1 C (97.0 F)
200936.1 C (97.0 F)
201037.0 C (98.6 F)
201138.3 C (100.9 F)
201236.6 C (97.9 F)
201338.5 C (101.3 F)
201437.6 C (99.7 F)
201537.2 C (99.0 F)
201637.3 C (99.1 F)
201736.2 C (97.2 F)
201839.2 C (102.6 F)
201937.6 C (99.7 F)
202038.5 C (101.3 F)
202137.1 C (98.8 F)
202238.4 C (101.1 F)
202338.2 C (100.8 F)
202438.5 C (101.3 F)
202538.7 C (101.7 F)
202638.0 C (100.4 F)

Coldest night (TNn)

Coldest night (TNn) at Chichibu by year The coldest night of the year at Chichibu, 1951 to 2026. The record is -15.8 C (3.6 F) in 1954, marked on the chart; the median year is -9.0 C (15.8 F). -20-15-10-5051960198020002020Record: -15.8 C (3.6 F) in 1954
The coldest night of the year at Chichibu, 1951 to 2026. The record is -15.8 C (3.6 F) in 1954, marked on the chart; the median year is -9.0 C (15.8 F).
Coldest night (TNn) at Chichibu by year
YearColdest night (TNn)
1951-12.1 C (10.2 F)
1952-10.3 C (13.5 F)
1953-10.3 C (13.5 F)
1954-15.8 C (3.6 F)
1955-10.1 C (13.8 F)
1956-10.0 C (14.0 F)
1957-10.2 C (13.6 F)
1958-10.2 C (13.6 F)
1959-10.8 C (12.6 F)
1960-9.8 C (14.4 F)
1961-10.2 C (13.6 F)
1962-9.9 C (14.2 F)
1963-12.5 C (9.5 F)
1964-8.9 C (16.0 F)
1965-10.3 C (13.5 F)
1966-11.2 C (11.8 F)
1967-10.9 C (12.4 F)
1968-12.3 C (9.9 F)
1969-8.9 C (16.0 F)
1970-12.2 C (10.0 F)
1971-10.3 C (13.5 F)
1972-9.3 C (15.3 F)
1973-10.0 C (14.0 F)
1974-10.6 C (12.9 F)
1975-11.6 C (11.1 F)
1976-11.8 C (10.8 F)
1977-11.3 C (11.7 F)
1978-11.1 C (12.0 F)
1979-8.5 C (16.7 F)
1980-8.9 C (16.0 F)
1981-9.8 C (14.4 F)
1982-9.5 C (14.9 F)
1983-9.1 C (15.6 F)
1984-11.7 C (10.9 F)
1985-9.8 C (14.4 F)
1986-9.8 C (14.4 F)
1987-8.1 C (17.4 F)
1988-9.3 C (15.3 F)
1989-6.9 C (19.6 F)
19901.8 C (35.2 F)
1991-4.8 C (23.4 F)
1992-7.0 C (19.4 F)
1993-6.8 C (19.8 F)
1994-7.2 C (19.0 F)
1995-8.6 C (16.5 F)
1996-9.3 C (15.3 F)
1997-8.5 C (16.7 F)
1998-8.5 C (16.7 F)
1999-8.8 C (16.2 F)
2000-7.4 C (18.7 F)
2001-9.9 C (14.2 F)
2002-7.4 C (18.7 F)
2003-7.8 C (18.0 F)
2004-7.5 C (18.5 F)
2005-9.0 C (15.8 F)
2006-8.9 C (16.0 F)
2007-6.9 C (19.6 F)
2008-7.4 C (18.7 F)
2009-7.6 C (18.3 F)
2010-7.4 C (18.7 F)
2011-7.9 C (17.8 F)
2012-8.9 C (16.0 F)
2013-7.6 C (18.3 F)
2014-8.7 C (16.3 F)
2015-6.6 C (20.1 F)
2016-9.0 C (15.8 F)
2017-7.2 C (19.0 F)
2018-9.5 C (14.9 F)
2019-7.5 C (18.5 F)
2020-7.3 C (18.9 F)
2021-8.5 C (16.7 F)
2022-7.4 C (18.7 F)
2023-9.9 C (14.2 F)
2024-7.3 C (18.9 F)
2025-6.7 C (19.9 F)
2026-8.2 C (17.2 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Chichibu by year The wettest day of the year at Chichibu, 1951 to 2026. The record is 294.0 mm (11.6 in) in 1982, marked on the chart; the median year is 107.7 mm (4.2 in). 01002003001960198020002020Record: 294.0 mm (11.6 in) in 1982
The wettest day of the year at Chichibu, 1951 to 2026. The record is 294.0 mm (11.6 in) in 1982, marked on the chart; the median year is 107.7 mm (4.2 in).
Wettest day (Rx1day) at Chichibu by year
YearWettest day (Rx1day)
1951109.4 mm (4.3 in)
195256.5 mm (2.2 in)
195396.6 mm (3.8 in)
1954182.7 mm (7.2 in)
195584.5 mm (3.3 in)
195686.4 mm (3.4 in)
195775.1 mm (3.0 in)
1958288.7 mm (11.4 in)
1959233.9 mm (9.2 in)
196096.5 mm (3.8 in)
1961190.2 mm (7.5 in)
1962120.0 mm (4.7 in)
1963100.0 mm (3.9 in)
196496.3 mm (3.8 in)
196592.6 mm (3.6 in)
1966233.3 mm (9.2 in)
196792.2 mm (3.6 in)
196870.0 mm (2.8 in)
196973.0 mm (2.9 in)
197055.0 mm (2.2 in)
1971263.0 mm (10.4 in)
1972239.5 mm (9.4 in)
197349.5 mm (1.9 in)
1974190.0 mm (7.5 in)
197573.0 mm (2.9 in)
197654.0 mm (2.1 in)
1977210.5 mm (8.3 in)
197878.0 mm (3.1 in)
197994.0 mm (3.7 in)
198066.0 mm (2.6 in)
1981182.5 mm (7.2 in)
1982294.0 mm (11.6 in)
1983162.5 mm (6.4 in)
198482.0 mm (3.2 in)
198586.5 mm (3.4 in)
1986148.5 mm (5.8 in)
198748.5 mm (1.9 in)
198881.0 mm (3.2 in)
1989165.0 mm (6.5 in)
1990214.1 mm (8.4 in)
1991165.1 mm (6.5 in)
199299.1 mm (3.9 in)
1993192.0 mm (7.6 in)
199459.9 mm (2.4 in)
1995105.9 mm (4.2 in)
1996170.9 mm (6.7 in)
199730.0 mm (1.2 in)
199859.9 mm (2.4 in)
1999124.0 mm (4.9 in)
2000168.9 mm (6.6 in)
2001133.9 mm (5.3 in)
2002206.0 mm (8.1 in)
200362.0 mm (2.4 in)
2004166.1 mm (6.5 in)
2005213.9 mm (8.4 in)
2006216.2 mm (8.5 in)
2007164.1 mm (6.5 in)
200883.1 mm (3.3 in)
2009112.5 mm (4.4 in)
201070.1 mm (2.8 in)
2011150.9 mm (5.9 in)
2012100.8 mm (4.0 in)
2013178.1 mm (7.0 in)
2014119.1 mm (4.7 in)
2015198.1 mm (7.8 in)
2016214.9 mm (8.5 in)
2017136.9 mm (5.4 in)
2018125.0 mm (4.9 in)
2019143.0 mm (5.6 in)
202090.9 mm (3.6 in)
202154.1 mm (2.1 in)
202261.0 mm (2.4 in)
202375.9 mm (3.0 in)
202487.9 mm (3.5 in)
202528.0 mm (1.1 in)
2026257.5 mm (10.1 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Chichibu by year The wettest five days of the year at Chichibu, 1951 to 2026. The record is 498.0 mm (19.6 in) in 2026, marked on the chart; the median year is 149.5 mm (5.9 in). 02004006001960198020002020Record: 498.0 mm (19.6 in) in 2026
The wettest five days of the year at Chichibu, 1951 to 2026. The record is 498.0 mm (19.6 in) in 2026, marked on the chart; the median year is 149.5 mm (5.9 in).
Wettest five days (Rx5day) at Chichibu by year
YearWettest five days (Rx5day)
1951144.6 mm (5.7 in)
1952118.1 mm (4.6 in)
1953172.7 mm (6.8 in)
1954205.3 mm (8.1 in)
1955153.8 mm (6.1 in)
1956140.8 mm (5.5 in)
1957116.9 mm (4.6 in)
1958388.0 mm (15.3 in)
1959370.4 mm (14.6 in)
1960139.7 mm (5.5 in)
1961274.3 mm (10.8 in)
1962181.1 mm (7.1 in)
1963130.7 mm (5.1 in)
1964118.2 mm (4.7 in)
1965175.5 mm (6.9 in)
1966270.8 mm (10.7 in)
1967149.5 mm (5.9 in)
1968185.0 mm (7.3 in)
196984.0 mm (3.3 in)
1970105.5 mm (4.2 in)
1971289.5 mm (11.4 in)
1972336.0 mm (13.2 in)
197375.0 mm (3.0 in)
1974295.0 mm (11.6 in)
197581.5 mm (3.2 in)
197690.5 mm (3.6 in)
1977214.5 mm (8.4 in)
1978124.0 mm (4.9 in)
1979126.0 mm (5.0 in)
1980103.5 mm (4.1 in)
1981282.0 mm (11.1 in)
1982383.5 mm (15.1 in)
1983422.0 mm (16.6 in)
1984102.5 mm (4.0 in)
1985218.5 mm (8.6 in)
1986248.0 mm (9.8 in)
198791.0 mm (3.6 in)
1988211.0 mm (8.3 in)
1989218.0 mm (8.6 in)
1990n/a
1991302.8 mm (11.9 in)
1992n/a
199333.2 mm (1.3 in)
1994n/a
1995n/a
1996n/a
1997n/a
1998143.5 mm (5.6 in)
1999140.0 mm (5.5 in)
200083.5 mm (3.3 in)
2001n/a
200277.5 mm (3.1 in)
2003118.0 mm (4.6 in)
2004n/a
2005106.6 mm (4.2 in)
2006141.7 mm (5.6 in)
2007n/a
200887.9 mm (3.5 in)
2009140.4 mm (5.5 in)
2010122.9 mm (4.8 in)
2011331.3 mm (13.0 in)
2012169.2 mm (6.7 in)
2013230.2 mm (9.1 in)
2014259.1 mm (10.2 in)
2015242.8 mm (9.6 in)
2016259.6 mm (10.2 in)
2017297.6 mm (11.7 in)
2018199.9 mm (7.9 in)
2019154.0 mm (6.1 in)
2020192.6 mm (7.6 in)
2021126.5 mm (5.0 in)
2022118.8 mm (4.7 in)
2023127.7 mm (5.0 in)
2024115.3 mm (4.5 in)
202548.0 mm (1.9 in)
2026498.0 mm (19.6 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Chichibu by year The longest dry spell of the year at Chichibu, 1951 to 2026. The record is 56 days in 1978, marked on the chart; the median year is 24 days. 02040601960198020002020Record: 56 days in 1978
The longest dry spell of the year at Chichibu, 1951 to 2026. The record is 56 days in 1978, marked on the chart; the median year is 24 days.
Longest dry spell (CDD) at Chichibu by year
YearLongest dry spell (CDD)
195128 days
195217 days
195331 days
195418 days
195528 days
195634 days
195734 days
195820 days
195924 days
196026 days
196132 days
196237 days
196333 days
196434 days
196526 days
196643 days
196727 days
196832 days
196931 days
197029 days
197141 days
197216 days
197351 days
197420 days
197522 days
197635 days
197725 days
197856 days
197924 days
198027 days
198145 days
198225 days
198337 days
198421 days
198535 days
198641 days
198718 days
198836 days
198926 days
1990n/a
19911 day
19921 day
19931 day
19941 day
1995n/a
19961 day
19971 day
19982 days
19999 days
2000n/a
2001n/a
20021 day
20031 day
20041 day
20052 days
20062 days
20071 day
200818 days
200919 days
201019 days
201135 days
201220 days
201322 days
201425 days
201514 days
201617 days
201730 days
201819 days
201926 days
202017 days
202115 days
202225 days
202324 days
202420 days
202513 days
20266 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

40 years with a frost

Across 40 years with a frost, the median last spring frost at Chichibu falls on 14 April and the median first autumn frost on 9 November, which leaves a median of 207 days between them.

Fitted over all years, the growing season changes by +6.0 days per decade at this station.

Frost dates and growing season at Chichibu
MeasureMedian, all yearsEarliest periodRecent period (1961 to 2025)Recent against earliestFitted trend
Last spring frost14 Apriln/a12 Apriln/a-4.4 days per decade
First autumn frost9 Novembern/a9 Novembern/a+1.5 days per decade
Growing days207 daysn/a208 daysn/a+6.0 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 112.9 mm (4.4 in) of rain is expected about once in 2 years. A day with at least 378.1 mm (14.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Chichibu: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years112.9 mm (4.4 in)
5 years172.6 mm (6.8 in)
10 years216.2 mm (8.5 in)
25 years276.7 mm (10.9 in)
50 years325.7 mm (12.8 in)
100 years378.1 mm (14.9 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: 294.0 mm (11.6 in) in 1982; 288.7 mm (11.4 in) in 1958; 263.0 mm (10.4 in) in 1971.

Station Changes

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

Download the Data

  • Data for Chichibu standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Chichibu 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 . Last revised (2026-10-13).