Built 2026-10-19 (19 October 2026)

Bolu Weather Records (TUM00017070)

Record envelope, standing records and threshold days for Bolu (TUM00017070), Turkey, with 54 years of record.

Key Facts for Bolu

  • Bolu (TUM00017070) is a weather station in Turkey at 40.73 latitude and 31.60 longitude, 743 m (2,438 ft) above sea level.
  • The station reports from 1973 to 2026, 54 years of record.
  • 1,464 records set at Bolu still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • Bolu set a daily record precipitation of 19.0 mm (0.7 in) 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: Turkey, 40.73 latitude, 31.60 longitude.
  • Elevation: 743 m (2,438 ft).
  • Period of record: 1973 to 2026, 54 years.
  • Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

2 days at or beyond a record
Daily record high and record low at Bolu, with 2026 drawn through them The band shows the record high and record low for each calendar day at Bolu. The lines show the 2026 daily maximum and minimum. 2 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -40-200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Bolu. 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 Bolu, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan19.8 C (67.6 F)-22.0 C (-7.6 F)12.7 C (54.9 F)-16.7 C (1.9 F)
Feb21.4 C (70.5 F)-22.0 C (-7.6 F)16.9 C (62.4 F)-1.9 C (28.6 F)
Mar27.6 C (81.7 F)-17.8 C (0.0 F)16.4 C (61.5 F)-4.1 C (24.6 F)
Apr31.8 C (89.2 F)-10.0 C (14.0 F)22.4 C (72.3 F)-1.9 C (28.6 F)
May33.0 C (91.4 F)-5.1 C (22.8 F)26.4 C (79.5 F)0.9 C (33.6 F)
Jun37.0 C (98.6 F)0.7 C (33.3 F)30.6 C (87.1 F)9.0 C (48.2 F)
Jul39.3 C (102.7 F)3.2 C (37.8 F)33.1 C (91.6 F)10.1 C (50.2 F)
Aug42.8 C (109.0 F)4.8 C (40.6 F)34.3 C (93.7 F)10.8 C (51.4 F)
Sep38.5 C (101.3 F)0.6 C (33.1 F)30.2 C (86.4 F)5.5 C (41.9 F)
Oct34.4 C (93.9 F)-6.0 C (21.2 F)26.8 C (80.2 F)3.5 C (38.3 F)
Nov26.9 C (80.4 F)-15.0 C (5.0 F)n/an/a
Dec23.5 C (74.3 F)-22.6 C (-8.7 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Bolu by the year they were set 1,464 records at Bolu still stand. 1985 holds the most, with 62. 0204060801973: 311974: 251982: 211983: 331984: 361985: 621986: 291987: 451988: 291989: 471990: 311991: 361992: 511993: 351994: 371995: 351996: 321997: 361998: 261999: 202000: 342001: 362002: 332003: 312004: 342006: 282007: 282008: 272009: 122010: 532011: 142012: 382013: 212014: 132015: 312016: 572017: 262018: 142019: 242020: 222021: 352022: 352023: 362024: 282025: 392026: 181973198519901995200020062011201620212026
1,464 records at Bolu still stand. 1985 holds the most, with 62.
Standing records at Bolu by the year they were set
Year setStanding records
197331
197425
198221
198333
198436
198562
198629
198745
198829
198947
199031
199136
199251
199335
199437
199535
199632
199736
199826
199920
200034
200136
200233
200331
200434
200628
200728
200827
200912
201053
201114
201238
201321
201413
201531
201657
201726
201814
201924
202022
202135
202235
202336
202428
202539
202618

All-Time Record Progression

1 new records
When Bolu set new all-time records 1 all-time records were set at Bolu between 15 August 2023 and 15 August 2023. Each dot is a new record. Record high maximum temperature15 August 2023: Record high maximum temperature 42.8 C (109.0 F)
1 all-time records were set at Bolu between 15 August 2023 and 15 August 2023. Each dot is a new record.
When Bolu set new all-time records
DateKindDetail
2023-08-15Record high maximum temperatureRecord high maximum temperature 42.8 C (109.0 F)

Wettest Day of Each Month

Aug: 107.2 mm (4.2 in)
Record daily precipitation for each month at Bolu The wettest day on record for each calendar month at Bolu. The most was 107.2 mm (4.2 in) on 15 August 1983. 050100150 Jan: 50.0 mm (2.0 in), 25 January 1973 Jan Feb: 49.8 mm (2.0 in), 13 February 2004 Feb Mar: 40.9 mm (1.6 in), 23 March 1994 Mar Apr: 35.1 mm (1.4 in), 18 April 1997 Apr May: 63.0 mm (2.5 in), 21 May 1998 May Jun: 52.3 mm (2.1 in), 6 June 2014 Jun Jul: 98.0 mm (3.9 in), 22 July 1992 Jul Aug: 107.2 mm (4.2 in), 15 August 1983 Aug Sep: 38.1 mm (1.5 in), 8 September 1992 Sep Oct: 50.0 mm (2.0 in), 3 October 1992 Oct Nov: 88.9 mm (3.5 in), 22 November 1993 Nov Dec: 70.1 mm (2.8 in), 26 December 1993 Dec
The wettest day on record for each calendar month at Bolu. The most was 107.2 mm (4.2 in) on 15 August 1983.
Record daily precipitation for each month at Bolu
MonthRecord daily precipitation (mm)Date
Jan50.0 mm (2.0 in)25 January 1973
Feb49.8 mm (2.0 in)13 February 2004
Mar40.9 mm (1.6 in)23 March 1994
Apr35.1 mm (1.4 in)18 April 1997
May63.0 mm (2.5 in)21 May 1998
Jun52.3 mm (2.1 in)6 June 2014
Jul98.0 mm (3.9 in)22 July 1992
Aug107.2 mm (4.2 in)15 August 1983
Sep38.1 mm (1.5 in)8 September 1992
Oct50.0 mm (2.0 in)3 October 1992
Nov88.9 mm (3.5 in)22 November 1993
Dec70.1 mm (2.8 in)26 December 1993

Period of Record Coverage

1973 to 2026
Days with data per year at Bolu 47 years of record at Bolu, 1973 to 2026. 23 years have data for under 90 percent of days and are left out of rankings: 1973, 1974, 1975, 1982, 1983, 1984, 1985, 1986 and others. 1973: 233 of 365 days1974: 160 of 365 days1975: 5 of 365 days1982: 157 of 365 days1983: 328 of 365 days1984: 304 of 366 days1985: 302 of 365 days1986: 326 of 365 days1987: 321 of 365 days1988: 316 of 366 days1989: 318 of 365 days1990: 274 of 365 days1991: 329 of 365 days1992: 328 of 366 days1993: 322 of 365 days1994: 314 of 365 days1995: 336 of 365 days1996: 349 of 366 days1997: 351 of 365 days1998: 323 of 365 days1999: 339 of 365 days2000: 351 of 366 days2001: 354 of 365 days2002: 352 of 365 days2003: 338 of 365 days2004: 341 of 366 days2006: 344 of 365 days2007: 348 of 365 days2008: 342 of 366 days2009: 355 of 365 days2010: 329 of 365 days2011: 358 of 365 days2012: 339 of 366 days2013: 245 of 365 days2014: 187 of 365 days2015: 322 of 365 days2016: 326 of 366 days2017: 359 of 365 days2018: 352 of 365 days2019: 319 of 365 days2020: 202 of 366 days2021: 355 of 365 days2022: 341 of 365 days2023: 345 of 365 days2024: 340 of 366 days2025: 358 of 365 days2026: 276 of 365 days1990200020102020
47 years of record at Bolu, 1973 to 2026. 23 years have data for under 90 percent of days and are left out of rankings: 1973, 1974, 1975, 1982, 1983, 1984, 1985, 1986 and others.
Days with data per year at Bolu
YearDays with dataShare of yearComplete
197323364%No
197416044%No
197551%No
198215743%No
198332890%No
198430483%No
198530283%No
198632689%No
198732188%No
198831686%No
198931887%No
199027475%No
199132990%Yes
199232890%No
199332288%No
199431486%No
199533692%Yes
199634995%Yes
199735196%Yes
199832388%No
199933993%Yes
200035196%Yes
200135497%Yes
200235296%Yes
200333893%Yes
200434193%Yes
200634494%Yes
200734895%Yes
200834293%Yes
200935597%Yes
201032990%Yes
201135898%Yes
201233993%Yes
201324567%No
201418751%No
201532288%No
201632689%No
201735998%Yes
201835296%Yes
201931987%No
202020255%No
202135597%Yes
202234193%Yes
202334595%Yes
202434093%Yes
202535898%Yes
202627676%No

Latest Records

20
Latest records at Bolu
DateStationRecordValueBeat old record byOld record stoodSignificance
6 October 2026Bolu, TRdaily rain (Provisional)19.0 mm (0.7 in)4.8 mm (0.19 in)7 years14 of 100 (Routine)
30 September 2026Bolu, TRdaily low max (Provisional)14.4 C (57.9 F)0.4 C (0.7 F)17 years10 of 100 (Routine)
24 September 2026Bolu, TRdaily rain (Provisional)25.0 mm (1.0 in)9.0 mm (0.35 in)43 years34 of 100 (Routine)
19 September 2026Bolu, TRdaily rain (Provisional)4.0 mm (0.16 in)0.4 mm (0.02 in)17 years10 of 100 (Routine)
18 September 2026Bolu, TRdaily rain (Provisional)13.2 mm (0.5 in)2.3 mm (0.09 in)12 years12 of 100 (Routine)
17 September 2026Bolu, TRdaily rain (Provisional)30.0 mm (1.2 in)26.2 mm (1.0 in)24 years52 of 100 (Notable)
15 September 2026Bolu, TRdaily rain (Provisional)15.0 mm (0.6 in)6.1 mm (0.24 in)24 years20 of 100 (Routine)
7 September 2026Bolu, TRmonthly rain (Provisional)60.0 mm (2.4 in)21.9 mm (0.9 in)33 years65 of 100 (Major)
31 August 2026Bolu, TRdaily rain (Provisional)17.0 mm (0.7 in)9.1 mm (0.36 in)8 years15 of 100 (Routine)
30 August 2026Bolu, TRdaily rain (Provisional)58.0 mm (2.3 in)49.6 mm (2.0 in)8 years47 of 100 (Notable)
29 August 2026Bolu, TRdaily rain (Provisional)72.6 mm (2.9 in)68.5 mm (2.7 in)13 years49 of 100 (Notable)
29 August 2026Bolu, TRdaily low max (Provisional)19.5 C (67.1 F)0.7 C (1.3 F)32 years15 of 100 (Routine)
15 August 2026Bolu, TRdaily low max24.7 C (76.5 F)0.3 C (0.5 F)28 years13 of 100 (Routine)
25 July 2026Bolu, TRdaily low max17.0 C (62.6 F)3.2 C (5.8 F)31 years22 of 100 (Routine)
25 July 2026Bolu, TRdaily rain9.0 mm (0.35 in)2.9 mm (0.11 in)31 years16 of 100 (Routine)
6 July 2026Bolu, TRdaily rain50.3 mm (2.0 in)44.2 mm (1.7 in)35 years53 of 100 (Notable)
30 May 2026Bolu, TRdaily low min2.7 C (36.9 F)3.3 C (5.9 F)17 years20 of 100 (Routine)
9 May 2026Bolu, TRdaily high min11.1 C (52.0 F)0.2 C (0.4 F)8 years7 of 100 (Routine)
4 May 2026Bolu, TRmonthly low max4.9 C (40.8 F)0.7 C (1.3 F)35 years26 of 100 (Routine)
3 May 2026Bolu, TRdaily low max8.5 C (47.3 F)0.7 C (1.3 F)36 years16 of 100 (Routine)

Climate Trend

15 complete years, 1987 to 2025
Annual mean temperature at Bolu as warming stripes, 1987 to 2025 One stripe for each of 15 complete years at Bolu, 1987 to 2025. Blue stripes are years cooler than the station's own mean of 11.0 C (51.7 F); red stripes are warmer. The coolest year was 1992, at 9.1 C (48.5 F), and the warmest was 2023, at 12.9 C (55.2 F). The strongest colour marks a difference of 2.0 C (3.6 F). 1987: 10.4 C, -0.6 C from the station mean1988: 10.8 C, -0.2 C from the station mean1989: 10.7 C, -0.3 C from the station mean1991: 10.7 C, -0.3 C from the station mean1992: 9.1 C, -1.8 C from the station mean1993: 10.4 C, -0.6 C from the station mean1995: 11.3 C, +0.3 C from the station mean1997: 10.1 C, -0.8 C from the station mean2000: 11.1 C, +0.2 C from the station mean2002: 11.6 C, +0.7 C from the station mean2011: 10.7 C, -0.3 C from the station mean2017: 10.9 C, -0.1 C from the station mean2021: 11.4 C, +0.4 C from the station mean2023: 12.9 C, +2.0 C from the station mean2025: 12.4 C, +1.4 C from the station mean198719901995200020052010201520202025
One stripe for each of 15 complete years at Bolu, 1987 to 2025. Blue stripes are years cooler than the station's own mean of 11.0 C (51.7 F); red stripes are warmer. The coolest year was 1992, at 9.1 C (48.5 F), and the warmest was 2023, at 12.9 C (55.2 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at Bolu as warming stripes, 1987 to 2025
YearAnnual mean temperatureDifference from the station mean
198710.4 C-0.56 C
198810.8 C-0.21 C
198910.7 C-0.31 C
199110.7 C-0.29 C
19929.1 C-1.82 C
199310.4 C-0.59 C
199511.3 C+0.32 C
199710.1 C-0.82 C
200011.1 C+0.16 C
200211.6 C+0.68 C
201110.7 C-0.26 C
201710.9 C-0.08 C
202111.4 C+0.43 C
202312.9 C+1.95 C
202512.4 C+1.39 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

1973 to 2026
Yearly extremes at Bolu: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)42.8 C (109.0 F)202336.0 C (96.8 F)47
Coldest night (TNn)-22.6 C (-8.7 F)1992-13.5 C (7.7 F)47
Wettest day (Rx1day)107.2 mm (4.2 in)198332.5 mm (1.3 in)47
Wettest five days (Rx5day)147.8 mm (5.8 in)202655.4 mm (2.2 in)45
Longest dry spell (CDD)37 days201717 days47

Hottest day (TXx)

Hottest day (TXx) at Bolu by year The hottest day of the year at Bolu, 1973 to 2026. The record is 42.8 C (109.0 F) in 2023, marked on the chart; the median year is 36.0 C (96.8 F). 102030405019801990200020102020Record: 42.8 C (109.0 F) in 2023
The hottest day of the year at Bolu, 1973 to 2026. The record is 42.8 C (109.0 F) in 2023, marked on the chart; the median year is 36.0 C (96.8 F).
Hottest day (TXx) at Bolu by year
YearHottest day (TXx)
197334.0 C (93.2 F)
197435.0 C (95.0 F)
197510.0 C (50.0 F)
198230.7 C (87.3 F)
198332.8 C (91.0 F)
198435.0 C (95.0 F)
198535.7 C (96.3 F)
198638.0 C (100.4 F)
198737.7 C (99.9 F)
198833.4 C (92.1 F)
198933.3 C (91.9 F)
199034.6 C (94.3 F)
199133.6 C (92.5 F)
199234.4 C (93.9 F)
199336.0 C (96.8 F)
199438.3 C (100.9 F)
199532.3 C (90.1 F)
199637.0 C (98.6 F)
199736.9 C (98.4 F)
199835.6 C (96.1 F)
199936.4 C (97.5 F)
200039.3 C (102.7 F)
200138.4 C (101.1 F)
200237.2 C (99.0 F)
200337.5 C (99.5 F)
200434.2 C (93.6 F)
200639.7 C (103.5 F)
200737.9 C (100.2 F)
200836.6 C (97.9 F)
200934.4 C (93.9 F)
201038.3 C (100.9 F)
201135.2 C (95.4 F)
201237.4 C (99.3 F)
201334.5 C (94.1 F)
201436.5 C (97.7 F)
201536.4 C (97.5 F)
201635.0 C (95.0 F)
201737.5 C (99.5 F)
201833.0 C (91.4 F)
201933.1 C (91.6 F)
202038.5 C (101.3 F)
202136.9 C (98.4 F)
202232.6 C (90.7 F)
202342.8 C (109.0 F)
202436.3 C (97.3 F)
202539.0 C (102.2 F)
202634.3 C (93.7 F)

Coldest night (TNn)

Coldest night (TNn) at Bolu by year The coldest night of the year at Bolu, 1973 to 2026. The record is -22.6 C (-8.7 F) in 1992, marked on the chart; the median year is -13.5 C (7.7 F). -25-20-15-10-519801990200020102020Record: -22.6 C (-8.7 F) in 1992
The coldest night of the year at Bolu, 1973 to 2026. The record is -22.6 C (-8.7 F) in 1992, marked on the chart; the median year is -13.5 C (7.7 F).
Coldest night (TNn) at Bolu by year
YearColdest night (TNn)
1973-19.0 C (-2.2 F)
1974-22.0 C (-7.6 F)
1975-8.0 C (17.6 F)
1982-8.0 C (17.6 F)
1983-17.5 C (0.5 F)
1984-11.8 C (10.8 F)
1985-22.0 C (-7.6 F)
1986-8.5 C (16.7 F)
1987-15.4 C (4.3 F)
1988-10.3 C (13.5 F)
1989-16.2 C (2.8 F)
1990-16.7 C (1.9 F)
1991-16.4 C (2.5 F)
1992-22.6 C (-8.7 F)
1993-17.9 C (-0.2 F)
1994-15.2 C (4.6 F)
1995-12.8 C (9.0 F)
1996-12.8 C (9.0 F)
1997-16.0 C (3.2 F)
1998-12.0 C (10.4 F)
1999-10.5 C (13.1 F)
2000-16.0 C (3.2 F)
2001-15.0 C (5.0 F)
2002-17.0 C (1.4 F)
2003-9.8 C (14.4 F)
2004-17.2 C (1.0 F)
2006-14.8 C (5.4 F)
2007-12.9 C (8.8 F)
2008-12.8 C (9.0 F)
2009-11.8 C (10.8 F)
2010-12.3 C (9.9 F)
2011-7.4 C (18.7 F)
2012-15.1 C (4.8 F)
2013-14.0 C (6.8 F)
2014-6.5 C (20.3 F)
2015-11.7 C (10.9 F)
2016-13.5 C (7.7 F)
2017-15.4 C (4.3 F)
2018-11.3 C (11.7 F)
2019-11.2 C (11.8 F)
2020-10.6 C (12.9 F)
2021-16.6 C (2.1 F)
2022-13.6 C (7.5 F)
2023-7.3 C (18.9 F)
2024-9.5 C (14.9 F)
2025-12.6 C (9.3 F)
2026-16.7 C (1.9 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Bolu by year The wettest day of the year at Bolu, 1973 to 2026. The record is 107.2 mm (4.2 in) in 1983, marked on the chart; the median year is 32.5 mm (1.3 in). 05010015019801990200020102020Record: 107.2 mm (4.2 in) in 1983
The wettest day of the year at Bolu, 1973 to 2026. The record is 107.2 mm (4.2 in) in 1983, marked on the chart; the median year is 32.5 mm (1.3 in).
Wettest day (Rx1day) at Bolu by year
YearWettest day (Rx1day)
197350.0 mm (2.0 in)
197418.0 mm (0.7 in)
19757.1 mm (0.28 in)
198224.9 mm (1.0 in)
1983107.2 mm (4.2 in)
198423.1 mm (0.9 in)
198539.9 mm (1.6 in)
198626.9 mm (1.1 in)
198730.0 mm (1.2 in)
198829.0 mm (1.1 in)
198926.9 mm (1.1 in)
199027.9 mm (1.1 in)
199130.0 mm (1.2 in)
199298.0 mm (3.9 in)
199388.9 mm (3.5 in)
199440.9 mm (1.6 in)
199535.1 mm (1.4 in)
199626.9 mm (1.1 in)
199755.9 mm (2.2 in)
199863.0 mm (2.5 in)
199951.3 mm (2.0 in)
200024.1 mm (0.9 in)
200124.9 mm (1.0 in)
200218.0 mm (0.7 in)
200327.9 mm (1.1 in)
200449.8 mm (2.0 in)
200623.1 mm (0.9 in)
200736.3 mm (1.4 in)
200828.7 mm (1.1 in)
200956.9 mm (2.2 in)
201028.7 mm (1.1 in)
201123.9 mm (0.9 in)
201221.8 mm (0.9 in)
201341.1 mm (1.6 in)
201452.3 mm (2.1 in)
201532.5 mm (1.3 in)
201632.5 mm (1.3 in)
201732.0 mm (1.3 in)
201836.3 mm (1.4 in)
201961.5 mm (2.4 in)
202037.6 mm (1.5 in)
202130.2 mm (1.2 in)
202245.0 mm (1.8 in)
202342.7 mm (1.7 in)
202437.1 mm (1.5 in)
202510.0 mm (0.4 in)
202672.6 mm (2.9 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Bolu by year The wettest five days of the year at Bolu, 1973 to 2026. The record is 147.8 mm (5.8 in) in 2026, marked on the chart; the median year is 55.4 mm (2.2 in). 05010015019801990200020102020Record: 147.8 mm (5.8 in) in 2026
The wettest five days of the year at Bolu, 1973 to 2026. The record is 147.8 mm (5.8 in) in 2026, marked on the chart; the median year is 55.4 mm (2.2 in).
Wettest five days (Rx5day) at Bolu by year
YearWettest five days (Rx5day)
197333.0 mm (1.3 in)
197414.5 mm (0.6 in)
1975n/a
198266.1 mm (2.6 in)
198344.2 mm (1.7 in)
198416.5 mm (0.6 in)
198518.0 mm (0.7 in)
198640.2 mm (1.6 in)
198715.3 mm (0.6 in)
198815.3 mm (0.6 in)
198944.5 mm (1.8 in)
199029.9 mm (1.2 in)
199156.2 mm (2.2 in)
199266.1 mm (2.6 in)
199379.5 mm (3.1 in)
199440.9 mm (1.6 in)
199544.3 mm (1.7 in)
199635.8 mm (1.4 in)
199771.1 mm (2.8 in)
1998115.8 mm (4.6 in)
199955.4 mm (2.2 in)
2000n/a
200146.4 mm (1.8 in)
200228.4 mm (1.1 in)
200358.0 mm (2.3 in)
200457.9 mm (2.3 in)
200629.8 mm (1.2 in)
2007101.6 mm (4.0 in)
200849.1 mm (1.9 in)
200965.7 mm (2.6 in)
201070.1 mm (2.8 in)
201139.4 mm (1.6 in)
201246.0 mm (1.8 in)
201353.4 mm (2.1 in)
201491.1 mm (3.6 in)
201569.4 mm (2.7 in)
201664.5 mm (2.5 in)
201749.5 mm (1.9 in)
201858.7 mm (2.3 in)
201985.6 mm (3.4 in)
202085.4 mm (3.4 in)
202155.6 mm (2.2 in)
202271.9 mm (2.8 in)
202378.5 mm (3.1 in)
202469.6 mm (2.7 in)
20258.9 mm (0.35 in)
2026147.8 mm (5.8 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Bolu by year The longest dry spell of the year at Bolu, 1973 to 2026. The record is 37 days in 2017, marked on the chart; the median year is 17 days. 01020304019801990200020102020Record: 37 days in 2017
The longest dry spell of the year at Bolu, 1973 to 2026. The record is 37 days in 2017, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Bolu by year
YearLongest dry spell (CDD)
19739 days
19746 days
19751 day
19829 days
198315 days
198415 days
198512 days
198627 days
198719 days
198811 days
198916 days
199010 days
199110 days
199214 days
199316 days
199413 days
199521 days
199618 days
199712 days
199812 days
199918 days
20002 days
20012 days
200210 days
200320 days
200417 days
200623 days
200725 days
200822 days
200921 days
201012 days
201122 days
201227 days
201319 days
201420 days
201526 days
201617 days
201737 days
201819 days
201922 days
202029 days
202118 days
202228 days
202324 days
202426 days
202517 days
202611 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.

Download the Data

  • Data for Bolu standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Bolu 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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-17).