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Built 2026-10-16 (16 October 2026)

Base Camp Threshold Days by Year

11 fixed thresholds counted per year at Base Camp (USS0010F02S): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Base Camp Thresholds

  • Base Camp: days with 10 mm (0.39 in) or more of precipitation in 45 years, most in 1996 with 45.
  • Base Camp: days with 25 mm (0.98 in) or more of precipitation in 41 years, most in 2017 with 9.
  • Base Camp: days with a maximum temperature at or below 0 C (32 F) in 38 years, most in 2020 with 107.
  • Base Camp: days with a maximum temperature at or above 30 C (86 F) in 36 years, most in 2007 with 26.
  • 11 fixed thresholds have at least one qualifying day at Base Camp.
36 years with a qualifying day
Days at or above 30 C (86 F) per year at Base Camp Days per year at Base Camp with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 26 in 2007. 01020301989: 91990: 81991: 11992: 31994: 101995: 31996: 71998: 131999: 52000: 122001: 132002: 112003: 252004: 22005: 122006: 162007: 262008: 42009: 22010: 22011: 22012: 112013: 132014: 12015: 62016: 72017: 62018: 62019: 42020: 92021: 182022: 152023: 52024: 132025: 112026: 20198919941999200320072011201520192023
Days per year at Base Camp with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 26 in 2007.
Days at or above 30 C (86 F) per year at Base Camp
YearDaysDecade average
198999
199086.3
199116.3
199236.3
1994106.3
199536.3
199676.3
1998136.3
199956.3
20001212.3
20011312.3
20021112.3
20032512.3
2004212.3
20051212.3
20061612.3
20072612.3
2008412.3
2009212.3
201025.8
201125.8
2012115.8
2013135.8
201415.8
201565.8
201675.8
201765.8
201865.8
201945.8
2020913
20211813
20221513
2023513
20241313
20251113
20262013
First to last qualifying date each year at Base Camp For each year, a bar from the first to the last day at Base Camp meeting 30 C (86 F). 1989: 4 July 1989 to 31 July 19891990: 24 June 1990 to 9 August 19901991: 10 August 1991 to 10 August 19911992: 2 August 1992 to 14 August 19921994: 20 June 1994 to 7 August 19941995: 28 July 1995 to 6 August 19951996: 2 July 1996 to 25 August 19961998: 2 July 1998 to 3 September 19981999: 23 July 1999 to 10 August 19992000: 13 July 2000 to 9 August 20002001: 29 June 2001 to 28 August 20012002: 25 June 2002 to 15 July 20022003: 10 July 2003 to 14 August 20032004: 14 July 2004 to 16 July 20042005: 8 July 2005 to 7 August 20052006: 14 July 2006 to 22 August 20062007: 28 June 2007 to 16 August 20072008: 26 July 2008 to 25 August 20082009: 23 July 2009 to 22 August 20092010: 26 July 2010 to 26 August 20102011: 3 July 2011 to 26 August 20112012: 24 June 2012 to 28 August 20122013: 28 June 2013 to 19 August 20132014: 23 July 2014 to 23 July 20142015: 27 June 2015 to 25 August 20152016: 18 July 2016 to 31 August 20162017: 5 July 2017 to 3 September 20172018: 6 July 2018 to 12 August 20182019: 12 July 2019 to 20 August 20192020: 31 July 2020 to 5 September 20202021: 13 June 2021 to 14 August 20212022: 8 July 2022 to 7 September 20222023: 22 July 2023 to 17 August 20232024: 9 July 2024 to 5 August 20242025: 1 July 2025 to 23 August 20252026: 11 July 2026 to 21 August 202619891995200120062011201620212026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Base Camp meeting 30 C (86 F).
First to last qualifying date each year at Base Camp
YearFirst dateLast date
19891989-07-041989-07-31
19901990-06-241990-08-09
19911991-08-101991-08-10
19921992-08-021992-08-14
19941994-06-201994-08-07
19951995-07-281995-08-06
19961996-07-021996-08-25
19981998-07-021998-09-03
19991999-07-231999-08-10
20002000-07-132000-08-09
20012001-06-292001-08-28
20022002-06-252002-07-15
20032003-07-102003-08-14
20042004-07-142004-07-16
20052005-07-082005-08-07
20062006-07-142006-08-22
20072007-06-282007-08-16
20082008-07-262008-08-25
20092009-07-232009-08-22
20102010-07-262010-08-26
20112011-07-032011-08-26
20122012-06-242012-08-28
20132013-06-282013-08-19
20142014-07-232014-07-23
20152015-06-272015-08-25
20162016-07-182016-08-31
20172017-07-052017-09-03
20182018-07-062018-08-12
20192019-07-122019-08-20
20202020-07-312020-09-05
20212021-06-132021-08-14
20222022-07-082022-09-07
20232023-07-222023-08-17
20242024-07-092024-08-05
20252025-07-012025-08-23
20262026-07-112026-08-21

Every Fixed Threshold

Fixed thresholds at Base Camp
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3626200720
35 C (95 F): Days2120021
90 F (32.2 C): Days15920038
0 C (32 F): Ice days (max38107202033
0 C (32 F): Frost days (min332712008156
-10 C (14 F): Days with min33128200850
-20 C (-4 F): Days with min334020225
-30 C (-22 F): Days with min14519961
10 mm (0.39 in): Days with 10 mm or more rain4545199620
25 mm (0.98 in): Days with 25 mm or more rain41920171
50 mm (1.97 in): Days with 50 mm or more rain3119861

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1989.

Download the Data

  • Data for Base Camp 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 2026-10-14 (14 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2026-10-14).