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Built 2026-10-17 (17 October 2026)

Chiba Weather Records (JA000047682)

Record envelope, standing records and threshold days for Chiba (JA000047682), Japan, with 60 years of record.

Key Facts for Chiba

  • Chiba (JA000047682) is a weather station in Japan at 35.60 latitude and 140.10 longitude, 19 m (62 ft) above sea level.
  • The station reports from 1967 to 2026, 60 years of record.
  • 1,464 records set at Chiba still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • Chiba set a daily record high minimum temperature of 22.8 C (73.0 F) on 24 September 2026 (provisional).

Provisional Records

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

About the Station

  • Location: Japan, 35.60 latitude, 140.10 longitude.
  • Elevation: 19 m (62 ft).
  • Period of record: 1967 to 2026, 60 years.
  • Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

10 days at or beyond a record
Daily record high and record low at Chiba, with 2026 drawn through them The band shows the record high and record low for each calendar day at Chiba. The lines show the 2026 daily maximum and minimum. 10 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -10010203040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Chiba. The lines show the 2026 daily maximum and minimum. 10 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Chiba, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan20.7 C (69.3 F)-5.1 C (22.8 F)17.3 C (63.1 F)-0.4 C (31.3 F)
Feb24.7 C (76.5 F)-5.2 C (22.6 F)21.6 C (70.9 F)-1.6 C (29.1 F)
Mar25.7 C (78.3 F)-4.4 C (24.1 F)18.7 C (65.7 F)2.7 C (36.9 F)
Apr28.7 C (83.7 F)0.4 C (32.7 F)25.4 C (77.7 F)8.3 C (46.9 F)
May31.7 C (89.1 F)6.8 C (44.2 F)31.6 C (88.9 F)11.9 C (53.4 F)
Jun36.4 C (97.5 F)11.2 C (52.2 F)29.2 C (84.6 F)15.2 C (59.4 F)
Jul37.8 C (100.0 F)12.5 C (54.5 F)35.8 C (96.4 F)20.2 C (68.4 F)
Aug38.5 C (101.3 F)16.5 C (61.7 F)36.2 C (97.2 F)20.2 C (68.4 F)
Sep36.2 C (97.2 F)11.7 C (53.1 F)30.6 C (87.1 F)18.1 C (64.6 F)
Oct32.8 C (91.0 F)5.8 C (42.4 F)28.1 C (82.6 F)17.6 C (63.7 F)
Nov27.5 C (81.5 F)-0.9 C (30.4 F)n/an/a
Dec24.2 C (75.6 F)-3.7 C (25.3 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Chiba by the year they were set 1,464 records at Chiba still stand. 2025 holds the most, with 83. 02550751001967: 481968: 221969: 461970: 551971: 281972: 211973: 251974: 161975: 81976: 451977: 471978: 241979: 251980: 391981: 451982: 221983: 331984: 581985: 321986: 171987: 381988: 311989: 281990: 11991: 161992: 151993: 221994: 101995: 101996: 161997: 131998: 251999: 52000: 82001: 142002: 112003: 242004: 212006: 92007: 162008: 162009: 172010: 302011: 112012: 62013: 302014: 132015: 192016: 212017: 132018: 282019: 282020: 192021: 122022: 232023: 322024: 402025: 832026: 341967197319791985199119972003201020162022
1,464 records at Chiba still stand. 2025 holds the most, with 83.
Standing records at Chiba by the year they were set
Year setStanding records
196748
196822
196946
197055
197128
197221
197325
197416
19758
197645
197747
197824
197925
198039
198145
198222
198333
198458
198532
198617
198738
198831
198928
19901
199116
199215
199322
199410
199510
199616
199713
199825
19995
20008
200114
200211
200324
200421
20069
200716
200816
200917
201030
201111
20126
201330
201413
201519
201621
201713
201828
201928
202019
202112
202223
202332
202440
202583
202634

All-Time Record Progression

5 new records
When Chiba set new all-time records 5 all-time records were set at Chiba between 20 July 2004 and 29 July 2024. Each dot is a new record. Record high maximum temperatureRecord high minimum temperature20 July 2004: Record high maximum temperature 37.8 C (100.0 F)19 August 2004: Record high minimum temperature 28.3 C (82.9 F)11 August 2013: Record high maximum temperature 38.4 C (101.1 F)7 August 2015: Record high maximum temperature 38.5 C (101.3 F)29 July 2024: Record high minimum temperature 29.9 C (85.8 F)20052010201520202025
5 all-time records were set at Chiba between 20 July 2004 and 29 July 2024. Each dot is a new record.
When Chiba set new all-time records
DateKindDetail
2004-07-20Record high maximum temperatureRecord high maximum temperature 37.8 C (100.0 F)
2004-08-19Record high minimum temperatureRecord high minimum temperature 28.3 C (82.9 F)
2013-08-11Record high maximum temperatureRecord high maximum temperature 38.4 C (101.1 F)
2015-08-07Record high maximum temperatureRecord high maximum temperature 38.5 C (101.3 F)
2024-07-29Record high minimum temperatureRecord high minimum temperature 29.9 C (85.8 F)

Wettest Day of Each Month

Sep: 260.1 mm (10.2 in)
Record daily precipitation for each month at Chiba The wettest day on record for each calendar month at Chiba. The most was 260.1 mm (10.2 in) on 22 September 1996. 0100200300 Jan: 75.9 mm (3.0 in), 15 January 2006 Jan Feb: 79.5 mm (3.1 in), 15 February 2014 Feb Mar: 87.5 mm (3.4 in), 30 March 1977 Mar Apr: 90.9 mm (3.6 in), 13 April 2020 Apr May: 70.1 mm (2.8 in), 21 May 2019 May Jun: 119.9 mm (4.7 in), 7 June 2014 Jun Jul: 179.5 mm (7.1 in), 11 July 2026 Jul Aug: 183.0 mm (7.2 in), 4 August 1986 Aug Sep: 260.1 mm (10.2 in), 22 September 1996 Sep Oct: 182.1 mm (7.2 in), 25 October 2019 Oct Nov: 85.6 mm (3.4 in), 12 November 2004 Nov Dec: 79.5 mm (3.1 in), 24 December 1972 Dec
The wettest day on record for each calendar month at Chiba. The most was 260.1 mm (10.2 in) on 22 September 1996.
Record daily precipitation for each month at Chiba
MonthRecord daily precipitation (mm)Date
Jan75.9 mm (3.0 in)15 January 2006
Feb79.5 mm (3.1 in)15 February 2014
Mar87.5 mm (3.4 in)30 March 1977
Apr90.9 mm (3.6 in)13 April 2020
May70.1 mm (2.8 in)21 May 2019
Jun119.9 mm (4.7 in)7 June 2014
Jul179.5 mm (7.1 in)11 July 2026
Aug183.0 mm (7.2 in)4 August 1986
Sep260.1 mm (10.2 in)22 September 1996
Oct182.1 mm (7.2 in)25 October 2019
Nov85.6 mm (3.4 in)12 November 2004
Dec79.5 mm (3.1 in)24 December 1972

Period of Record Coverage

1967 to 2026
Days with data per year at Chiba 59 years of record at Chiba, 1967 to 2026. 10 years have data for under 90 percent of days and are left out of rankings: 1990, 1991, 1997, 1998, 1999, 2001, 2020, 2023 and others. 1967: 365 of 365 days1968: 366 of 366 days1969: 365 of 365 days1970: 365 of 365 days1971: 365 of 365 days1972: 366 of 366 days1973: 364 of 365 days1974: 363 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: 5 of 365 days1991: 277 of 365 days1992: 348 of 366 days1993: 337 of 365 days1994: 348 of 365 days1995: 331 of 365 days1996: 341 of 366 days1997: 318 of 365 days1998: 326 of 365 days1999: 322 of 365 days2000: 352 of 366 days2001: 298 of 365 days2002: 331 of 365 days2003: 341 of 365 days2004: 330 of 366 days2006: 343 of 365 days2007: 349 of 365 days2008: 348 of 366 days2009: 344 of 365 days2010: 340 of 365 days2011: 344 of 365 days2012: 347 of 366 days2013: 339 of 365 days2014: 336 of 365 days2015: 341 of 365 days2016: 348 of 366 days2017: 347 of 365 days2018: 340 of 365 days2019: 330 of 365 days2020: 315 of 366 days2021: 329 of 365 days2022: 342 of 365 days2023: 260 of 365 days2024: 291 of 366 days2025: 354 of 365 days2026: 273 of 365 days197019801990200020102020
59 years of record at Chiba, 1967 to 2026. 10 years have data for under 90 percent of days and are left out of rankings: 1990, 1991, 1997, 1998, 1999, 2001, 2020, 2023 and others.
Days with data per year at Chiba
YearDays with dataShare of yearComplete
1967365100%Yes
1968366100%Yes
1969365100%Yes
1970365100%Yes
1971365100%Yes
1972366100%Yes
1973364100%Yes
197436399%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
199051%No
199127776%No
199234895%Yes
199333792%Yes
199434895%Yes
199533191%Yes
199634193%Yes
199731887%No
199832689%No
199932288%No
200035296%Yes
200129882%No
200233191%Yes
200334193%Yes
200433090%Yes
200634394%Yes
200734996%Yes
200834895%Yes
200934494%Yes
201034093%Yes
201134494%Yes
201234795%Yes
201333993%Yes
201433692%Yes
201534193%Yes
201634895%Yes
201734795%Yes
201834093%Yes
201933090%Yes
202031586%No
202132990%Yes
202234294%Yes
202326071%No
202429180%No
202535497%Yes
202627375%No

Latest Records

20
Latest records at Chiba
DateStationRecordValueBeat old record byOld record stoodSignificance
24 September 2026Chiba, JPdaily high min (Provisional)22.8 C (73.0 F)0.5 C (0.9 F)28 years15 of 100 (Routine)
22 September 2026Chiba, JPdaily high min (Provisional)22.4 C (72.3 F)0.1 C (0.2 F)40 years18 of 100 (Routine)
11 September 2026Chiba, JPdaily low max (Provisional)20.9 C (69.6 F)1.4 C (2.5 F)44 years22 of 100 (Routine)
10 September 2026Chiba, JPdaily low max (Provisional)21.4 C (70.5 F)1.5 C (2.7 F)55 years26 of 100 (Routine)
3 September 2026Chiba, JPmonthly rain (Provisional)285.5 mm (11.2 in)25.4 mm (1.0 in)29 years33 of 100 (Routine)
25 August 2026Chiba, JPall-time rain (Provisional)288.0 mm (11.3 in)27.9 mm (1.1 in)29 years45 of 100 (Notable)
25 August 2026Chiba, JPdaily high min (Provisional)27.9 C (82.2 F)0.2 C (0.4 F)8 years8 of 100 (Routine)
21 August 2026Chiba, JPdaily high min (Provisional)27.1 C (80.8 F)0.1 C (0.2 F)0 years6 of 100 (Routine)
20 August 2026Chiba, JPdaily rain (Provisional)140.5 mm (5.5 in)82.6 mm (3.3 in)27 years47 of 100 (Notable)
1 August 2026Chiba, JPmonthly high min29.6 C (85.3 F)1.0 C (1.8 F)0 years20 of 100 (Routine)
1 August 2026Chiba, JPdaily high max36.2 C (97.2 F)0.3 C (0.5 F)31 years16 of 100 (Routine)
31 July 2026Chiba, JPdaily high min28.1 C (82.6 F)0.3 C (0.5 F)4 years8 of 100 (Routine)
31 July 2026Chiba, JPdaily high max (Tie)34.8 C (94.6 F)tie3 years1 of 100 (Routine)
29 July 2026Chiba, JPdaily rain86.5 mm (3.4 in)62.5 mm (2.5 in)36 years50 of 100 (Notable)
22 July 2026Chiba, JPdaily high min29.4 C (84.9 F)1.6 C (2.9 F)8 years13 of 100 (Routine)
19 July 2026Chiba, JPdaily rain104.0 mm (4.1 in)47.1 mm (1.9 in)12 years34 of 100 (Routine)
16 July 2026Chiba, JPdaily rain87.5 mm (3.4 in)25.0 mm (1.0 in)37 years30 of 100 (Routine)
16 July 2026Chiba, JPdaily high min27.9 C (82.2 F)0.2 C (0.4 F)8 years8 of 100 (Routine)
15 July 2026Chiba, JPdaily high min27.8 C (82.0 F)1.0 C (1.8 F)24 years16 of 100 (Routine)
14 July 2026Chiba, JPdaily high min27.1 C (80.8 F)0.7 C (1.3 F)0 years8 of 100 (Routine)

Climate Trend

24 complete years, 1967 to 2025
Annual mean temperature at Chiba as warming stripes, 1967 to 2025 One stripe for each of 24 complete years at Chiba, 1967 to 2025. Blue stripes are years cooler than the station's own mean of 15.2 C (59.4 F); red stripes are warmer. The coolest year was 1984, at 14.1 C (57.3 F), and the warmest was 2025, at 17.9 C (64.2 F). The strongest colour marks a difference of 2.7 C (4.9 F). 1967: 14.9 C, -0.3 C from the station mean1968: 14.7 C, -0.5 C from the station mean1969: 14.8 C, -0.5 C from the station mean1970: 14.3 C, -0.9 C from the station mean1971: 15.0 C, -0.3 C from the station mean1972: 15.7 C, +0.5 C from the station mean1973: 15.4 C, +0.2 C from the station mean1974: 14.8 C, -0.4 C from the station mean1975: 15.2 C, -0.1 C from the station mean1976: 14.7 C, -0.5 C from the station mean1977: 15.3 C, +0.1 C from the station mean1978: 15.6 C, +0.3 C from the station mean1979: 16.3 C, +1.0 C from the station mean1980: 15.0 C, -0.2 C from the station mean1981: 14.5 C, -0.8 C from the station mean1982: 15.2 C, 0.0 C from the station mean1983: 14.9 C, -0.3 C from the station mean1984: 14.1 C, -1.2 C from the station mean1985: 15.3 C, +0.1 C from the station mean1986: 14.8 C, -0.5 C from the station mean1987: 15.8 C, +0.6 C from the station mean1988: 15.1 C, -0.1 C from the station mean1989: 16.1 C, +0.9 C from the station mean2025: 17.9 C, +2.7 C from the station mean196719751980198519901995200020052010201520202025
One stripe for each of 24 complete years at Chiba, 1967 to 2025. Blue stripes are years cooler than the station's own mean of 15.2 C (59.4 F); red stripes are warmer. The coolest year was 1984, at 14.1 C (57.3 F), and the warmest was 2025, at 17.9 C (64.2 F). The strongest colour marks a difference of 2.7 C (4.9 F).
Annual mean temperature at Chiba as warming stripes, 1967 to 2025
YearAnnual mean temperatureDifference from the station mean
196714.9 C-0.30 C
196814.7 C-0.50 C
196914.8 C-0.46 C
197014.3 C-0.93 C
197115.0 C-0.25 C
197215.7 C+0.47 C
197315.4 C+0.22 C
197414.8 C-0.39 C
197515.2 C-0.06 C
197614.7 C-0.54 C
197715.3 C+0.10 C
197815.6 C+0.35 C
197916.3 C+1.05 C
198015.0 C-0.24 C
198114.5 C-0.75 C
198215.2 C+0.01 C
198314.9 C-0.32 C
198414.1 C-1.16 C
198515.3 C+0.13 C
198614.8 C-0.45 C
198715.8 C+0.58 C
198815.1 C-0.12 C
198916.1 C+0.88 C
202517.9 C+2.70 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

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

1967 to 2026
Yearly extremes at Chiba: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)38.5 C (101.3 F)201535.2 C (95.4 F)59
Coldest night (TNn)-5.2 C (22.6 F)1967-2.0 C (28.4 F)59
Wettest day (Rx1day)288.0 mm (11.3 in)2026104.9 mm (4.1 in)59
Wettest five days (Rx5day)317.5 mm (12.5 in)2026154.5 mm (6.1 in)53
Longest dry spell (CDD)51 days197318 days55

Hottest day (TXx)

Hottest day (TXx) at Chiba by year The hottest day of the year at Chiba, 1967 to 2026. The record is 38.5 C (101.3 F) in 2015, marked on the chart; the median year is 35.2 C (95.4 F). 303234363840197019801990200020102020Record: 38.5 C (101.3 F) in 2015
The hottest day of the year at Chiba, 1967 to 2026. The record is 38.5 C (101.3 F) in 2015, marked on the chart; the median year is 35.2 C (95.4 F).
Hottest day (TXx) at Chiba by year
YearHottest day (TXx)
196734.0 C (93.2 F)
196832.2 C (90.0 F)
196934.8 C (94.6 F)
197034.2 C (93.6 F)
197133.5 C (92.3 F)
197235.0 C (95.0 F)
197334.9 C (94.8 F)
197432.5 C (90.5 F)
197534.6 C (94.3 F)
197631.6 C (88.9 F)
197732.7 C (90.9 F)
197835.9 C (96.6 F)
197934.2 C (93.6 F)
198031.6 C (88.9 F)
198133.8 C (92.8 F)
198232.0 C (89.6 F)
198336.8 C (98.2 F)
198435.2 C (95.4 F)
198534.4 C (93.9 F)
198633.6 C (92.5 F)
198734.0 C (93.2 F)
198832.8 C (91.0 F)
198933.9 C (93.0 F)
199031.3 C (88.3 F)
199135.3 C (95.5 F)
199235.6 C (96.1 F)
199333.3 C (91.9 F)
199437.6 C (99.7 F)
199537.1 C (98.8 F)
199635.7 C (96.3 F)
199733.7 C (92.7 F)
199836.0 C (96.8 F)
199933.7 C (92.7 F)
200034.1 C (93.4 F)
200137.1 C (98.8 F)
200235.6 C (96.1 F)
200334.8 C (94.6 F)
200437.8 C (100.0 F)
200635.6 C (96.1 F)
200737.4 C (99.3 F)
200835.3 C (95.5 F)
200933.7 C (92.7 F)
201037.3 C (99.1 F)
201136.3 C (97.3 F)
201235.4 C (95.7 F)
201338.4 C (101.1 F)
201435.0 C (95.0 F)
201538.5 C (101.3 F)
201637.7 C (99.9 F)
201736.3 C (97.3 F)
201837.4 C (99.3 F)
201934.7 C (94.5 F)
202035.7 C (96.3 F)
202135.5 C (95.9 F)
202236.4 C (97.5 F)
202336.8 C (98.2 F)
202437.4 C (99.3 F)
202535.2 C (95.4 F)
202636.2 C (97.2 F)

Coldest night (TNn)

Coldest night (TNn) at Chiba by year The coldest night of the year at Chiba, 1967 to 2026. The record is -5.2 C (22.6 F) in 1967, marked on the chart; the median year is -2.0 C (28.4 F). -10-5051015197019801990200020102020Record: -5.2 C (22.6 F) in 1967
The coldest night of the year at Chiba, 1967 to 2026. The record is -5.2 C (22.6 F) in 1967, marked on the chart; the median year is -2.0 C (28.4 F).
Coldest night (TNn) at Chiba by year
YearColdest night (TNn)
1967-5.2 C (22.6 F)
1968-5.1 C (22.8 F)
1969-4.0 C (24.8 F)
1970-5.1 C (22.8 F)
1971-4.1 C (24.6 F)
1972-2.0 C (28.4 F)
1973-3.7 C (25.3 F)
1974-3.3 C (26.1 F)
1975-3.6 C (25.5 F)
1976-5.0 C (23.0 F)
1977-4.4 C (24.1 F)
1978-3.7 C (25.3 F)
1979-2.2 C (28.0 F)
1980-2.5 C (27.5 F)
1981-4.9 C (23.2 F)
1982-3.0 C (26.6 F)
1983-4.6 C (23.7 F)
1984-4.1 C (24.6 F)
1985-4.2 C (24.4 F)
1986-3.4 C (25.9 F)
1987-2.4 C (27.7 F)
1988-3.5 C (25.7 F)
19890.0 C (32.0 F)
199013.5 C (56.3 F)
19910.3 C (32.5 F)
1992-1.2 C (29.8 F)
1993-0.3 C (31.5 F)
1994-2.2 C (28.0 F)
1995-1.3 C (29.7 F)
1996-2.1 C (28.2 F)
1997-2.4 C (27.7 F)
1998-1.6 C (29.1 F)
1999-1.7 C (28.9 F)
2000-1.5 C (29.3 F)
2001-2.8 C (27.0 F)
2002-1.2 C (29.8 F)
2003-1.7 C (28.9 F)
2004-0.8 C (30.6 F)
2006-2.3 C (27.9 F)
2007-0.2 C (31.6 F)
2008-1.0 C (30.2 F)
20090.2 C (32.4 F)
2010-1.1 C (30.0 F)
2011-1.2 C (29.8 F)
2012-1.9 C (28.6 F)
2013-0.9 C (30.4 F)
2014-1.6 C (29.1 F)
2015-0.8 C (30.6 F)
2016-0.6 C (30.9 F)
2017-0.7 C (30.7 F)
2018-2.3 C (27.9 F)
2019-0.5 C (31.1 F)
2020-1.7 C (28.9 F)
2021-2.1 C (28.2 F)
2022-2.0 C (28.4 F)
2023-1.7 C (28.9 F)
20240.8 C (33.4 F)
20250.6 C (33.1 F)
2026-1.6 C (29.1 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Chiba by year The wettest day of the year at Chiba, 1967 to 2026. The record is 288.0 mm (11.3 in) in 2026, marked on the chart; the median year is 104.9 mm (4.1 in). 0100200300197019801990200020102020Record: 288.0 mm (11.3 in) in 2026
The wettest day of the year at Chiba, 1967 to 2026. The record is 288.0 mm (11.3 in) in 2026, marked on the chart; the median year is 104.9 mm (4.1 in).
Wettest day (Rx1day) at Chiba by year
YearWettest day (Rx1day)
196780.0 mm (3.1 in)
1968119.5 mm (4.7 in)
196957.5 mm (2.3 in)
197069.5 mm (2.7 in)
1971150.0 mm (5.9 in)
197282.0 mm (3.2 in)
197388.0 mm (3.5 in)
197467.0 mm (2.6 in)
1975109.0 mm (4.3 in)
197652.5 mm (2.1 in)
197797.0 mm (3.8 in)
197849.5 mm (1.9 in)
1979109.0 mm (4.3 in)
198078.5 mm (3.1 in)
1981120.5 mm (4.7 in)
1982111.0 mm (4.4 in)
198374.0 mm (2.9 in)
198494.0 mm (3.7 in)
198583.0 mm (3.3 in)
1986183.0 mm (7.2 in)
1987101.0 mm (4.0 in)
1988116.5 mm (4.6 in)
1989137.0 mm (5.4 in)
199089.9 mm (3.5 in)
1991185.9 mm (7.3 in)
199264.0 mm (2.5 in)
1993180.1 mm (7.1 in)
1994124.0 mm (4.9 in)
1995105.9 mm (4.2 in)
1996260.1 mm (10.2 in)
199754.1 mm (2.1 in)
199864.0 mm (2.5 in)
1999113.0 mm (4.4 in)
2000172.0 mm (6.8 in)
200154.1 mm (2.1 in)
200270.1 mm (2.8 in)
2003176.0 mm (6.9 in)
2004126.5 mm (5.0 in)
2006113.0 mm (4.4 in)
2007102.1 mm (4.0 in)
200893.5 mm (3.7 in)
2009132.6 mm (5.2 in)
2010152.9 mm (6.0 in)
201189.9 mm (3.5 in)
2012104.9 mm (4.1 in)
201380.0 mm (3.1 in)
2014119.9 mm (4.7 in)
2015131.1 mm (5.2 in)
2016105.9 mm (4.2 in)
2017118.1 mm (4.6 in)
201859.9 mm (2.4 in)
2019182.1 mm (7.2 in)
202090.9 mm (3.6 in)
2021129.0 mm (5.1 in)
202272.9 mm (2.9 in)
2023211.1 mm (8.3 in)
202499.1 mm (3.9 in)
202524.0 mm (0.9 in)
2026288.0 mm (11.3 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Chiba by year The wettest five days of the year at Chiba, 1967 to 2026. The record is 317.5 mm (12.5 in) in 2026, marked on the chart; the median year is 154.5 mm (6.1 in). 0100200300400197019801990200020102020Record: 317.5 mm (12.5 in) in 2026
The wettest five days of the year at Chiba, 1967 to 2026. The record is 317.5 mm (12.5 in) in 2026, marked on the chart; the median year is 154.5 mm (6.1 in).
Wettest five days (Rx5day) at Chiba by year
YearWettest five days (Rx5day)
1967172.5 mm (6.8 in)
1968213.0 mm (8.4 in)
1969103.5 mm (4.1 in)
1970102.5 mm (4.0 in)
1971224.5 mm (8.8 in)
1972154.5 mm (6.1 in)
197388.0 mm (3.5 in)
1974123.5 mm (4.9 in)
1975179.0 mm (7.0 in)
197695.5 mm (3.8 in)
1977175.0 mm (6.9 in)
197854.0 mm (2.1 in)
1979150.0 mm (5.9 in)
1980109.5 mm (4.3 in)
1981127.5 mm (5.0 in)
1982183.5 mm (7.2 in)
1983155.0 mm (6.1 in)
1984127.0 mm (5.0 in)
1985169.5 mm (6.7 in)
1986205.5 mm (8.1 in)
1987118.0 mm (4.6 in)
1988203.5 mm (8.0 in)
1989173.5 mm (6.8 in)
1990n/a
1991273.1 mm (10.8 in)
1992n/a
1993n/a
1994n/a
1995n/a
1996n/a
199781.3 mm (3.2 in)
199874.4 mm (2.9 in)
1999244.5 mm (9.6 in)
2000127.0 mm (5.0 in)
200167.1 mm (2.6 in)
2002168.1 mm (6.6 in)
2003224.0 mm (8.8 in)
2004237.0 mm (9.3 in)
2006190.5 mm (7.5 in)
2007142.7 mm (5.6 in)
2008178.6 mm (7.0 in)
2009177.0 mm (7.0 in)
2010152.9 mm (6.0 in)
2011113.1 mm (4.5 in)
2012145.3 mm (5.7 in)
201398.0 mm (3.9 in)
2014212.8 mm (8.4 in)
2015282.0 mm (11.1 in)
2016150.1 mm (5.9 in)
2017191.2 mm (7.5 in)
2018106.6 mm (4.2 in)
2019198.1 mm (7.8 in)
2020144.3 mm (5.7 in)
2021293.2 mm (11.5 in)
2022153.7 mm (6.1 in)
2023223.5 mm (8.8 in)
2024139.0 mm (5.5 in)
202512.0 mm (0.5 in)
2026317.5 mm (12.5 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Chiba by year The longest dry spell of the year at Chiba, 1967 to 2026. The record is 51 days in 1973, marked on the chart; the median year is 18 days. 0204060197019801990200020102020Record: 51 days in 1973
The longest dry spell of the year at Chiba, 1967 to 2026. The record is 51 days in 1973, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at Chiba by year
YearLongest dry spell (CDD)
196719 days
196824 days
196924 days
197029 days
197126 days
197214 days
197351 days
197420 days
197522 days
197631 days
197717 days
197829 days
197920 days
198019 days
198117 days
198215 days
198314 days
198428 days
198524 days
198641 days
198718 days
198827 days
198925 days
1990n/a
19911 day
19921 day
19931 day
1994n/a
19951 day
19961 day
19972 days
19985 days
19998 days
2000n/a
2001n/a
20022 days
200314 days
200426 days
200615 days
200716 days
200816 days
200918 days
201026 days
201123 days
201219 days
201314 days
201421 days
201518 days
201617 days
201719 days
201820 days
201915 days
202014 days
202111 days
202225 days
202318 days
202416 days
202517 days
202614 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

20 years with a frost

Across 20 years with a frost, the median last spring frost at Chiba falls on 7 March and the median first autumn frost on 16 December, which leaves a median of 281 days between them.

Frost dates and growing season at Chiba
MeasureMedian, all yearsEarliest periodRecent period (1967 to 1988)Recent against earliestFitted trend
Last spring frost7 Marchn/a7 Marchn/an/a
First autumn frost16 Decembern/a16 Decembern/an/a
Growing days281 daysn/a281 daysn/an/a

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

40 years, 1967 to 2022

A day with at least 100.7 mm (4.0 in) of rain is expected about once in 2 years. A day with at least 189.2 mm (7.4 in) of rain is expected about once in 100 years.

Rainfall return levels at Chiba: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years100.7 mm (4.0 in)
5 years129.7 mm (5.1 in)
10 years146.6 mm (5.8 in)
25 years165.5 mm (6.5 in)
50 years178.0 mm (7.0 in)Longer than the 40 years of record
100 years189.2 mm (7.4 in)Longer than the 40 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, 40 years of values from 1967 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: 183.0 mm (7.2 in) in 1986; 182.1 mm (7.2 in) in 2019; 152.9 mm (6.0 in) in 2010.

Download the Data

  • Data for Chiba standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Chiba 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-15).