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Data as of 2026-10-17
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Built 2026-10-19 (19 October 2026)

Bolu Threshold Days by Year (TUM00017070)

12 fixed thresholds counted per year at Bolu (TUM00017070): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Bolu Thresholds

  • Bolu: days with a maximum temperature at or above 30 C (86 F) in 25 years, most in 2024 with 64.
  • Bolu: days with a maximum temperature at or above 90 F (32.2 C) in 25 years, most in 2007 with 33.
  • Bolu: days with a maximum temperature at or below 0 C (32 F) in 25 years, most in 2002 with 16.
  • Bolu: days with 10 mm (0.39 in) or more of precipitation in 19 years, most in 2010 with 24.
  • 12 fixed thresholds have at least one qualifying day at Bolu.
25 years with a qualifying day
Days at or above 30 C (86 F) per year at Bolu Days per year at Bolu with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 64 in 2024. 0204060801991: 101995: 201996: 231997: 91999: 262000: 312001: 472002: 282003: 342004: 152006: 432007: 622008: 442009: 262010: 392011: 222012: 522017: 332018: 142021: 252022: 82023: 382024: 642025: 412026: 18199119972001200420082011201820232026
Days per year at Bolu with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 64 in 2024.
Days at or above 30 C (86 F) per year at Bolu
YearDaysDecade average
19911017.6
19952017.6
19962317.6
1997917.6
19992617.6
20003136.7
20014736.7
20022836.7
20033436.7
20041536.7
20064336.7
20076236.7
20084436.7
20092636.7
20103932
20112232
20125232
20173332
20181432
20212532.3
2022832.3
20233832.3
20246432.3
20254132.3
20261832.3
First to last qualifying date each year at Bolu For each year, a bar from the first to the last day at Bolu meeting 30 C (86 F). 1991: 17 June 1991 to 2 October 19911995: 22 May 1995 to 15 September 19951996: 23 June 1996 to 14 September 19961997: 9 May 1997 to 30 August 19971999: 22 May 1999 to 5 October 19992000: 16 June 2000 to 23 September 20002001: 1 June 2001 to 4 October 20012002: 26 May 2002 to 25 September 20022003: 3 May 2003 to 6 October 20032004: 11 July 2004 to 29 September 20042006: 25 May 2006 to 18 September 20062007: 6 May 2007 to 28 September 20072008: 21 May 2008 to 16 September 20082009: 16 May 2009 to 5 September 20092010: 13 May 2010 to 27 September 20102011: 9 June 2011 to 21 September 20112012: 10 June 2012 to 2 October 20122017: 13 May 2017 to 21 September 20172018: 9 June 2018 to 24 September 20182021: 20 May 2021 to 29 August 20212022: 29 May 2022 to 18 September 20222023: 16 June 2023 to 25 September 20232024: 2 June 2024 to 5 October 20242025: 25 May 2025 to 5 September 20252026: 29 June 2026 to 12 September 20261991199920032008201220222026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Bolu meeting 30 C (86 F).
First to last qualifying date each year at Bolu
YearFirst dateLast date
19911991-06-171991-10-02
19951995-05-221995-09-15
19961996-06-231996-09-14
19971997-05-091997-08-30
19991999-05-221999-10-05
20002000-06-162000-09-23
20012001-06-012001-10-04
20022002-05-262002-09-25
20032003-05-032003-10-06
20042004-07-112004-09-29
20062006-05-252006-09-18
20072007-05-062007-09-28
20082008-05-212008-09-16
20092009-05-162009-09-05
20102010-05-132010-09-27
20112011-06-092011-09-21
20122012-06-102012-10-02
20172017-05-132017-09-21
20182018-06-092018-09-24
20212021-05-202021-08-29
20222022-05-292022-09-18
20232023-06-162023-09-25
20242024-06-022024-10-05
20252025-05-252025-09-05
20262026-06-292026-09-12

Every Fixed Threshold

Fixed thresholds at Bolu
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2564202418
35 C (95 F): Days181120078
40 C (104 F): Days1120231
90 F (32.2 C): Days253320074
100 F (37.8 C): Days7320231
0 C (32 F): Ice days (max251620026
0 C (32 F): Frost days (min370202545
-10 C (14 F): Days with min3420253
20 C (68 F): Tropical nights (min1120251
10 mm (0.39 in): Days with 10 mm or more rain1924201015
25 mm (0.98 in): Days with 25 mm or more rain16820236
50 mm (1.97 in): Days with 50 mm or more rain4120094

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1991.

Download the Data

  • 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). Threshold counts are computed by this site.

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