Daily records
Page built 2026-10-19
Data as of 2026-10-17
Search
Built 2026-10-19 (19 October 2026)

South Mtn. Threshold Days by Year (USS0016G01S)

11 fixed thresholds counted per year at South Mtn. (USS0016G01S): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for South Mtn. Thresholds

  • South Mtn.: days with 10 mm (0.39 in) or more of precipitation in 45 years, most in 1996 with 52.
  • South Mtn.: days with 25 mm (0.98 in) or more of precipitation in 45 years, most in 2005 with 12.
  • South Mtn.: days with a maximum temperature at or below 0 C (32 F) in 42 years, most in 1985 with 102.
  • South Mtn.: days with a maximum temperature at or above 30 C (86 F) in 39 years, most in 2021 with 27.
  • 11 fixed thresholds have at least one qualifying day at South Mtn..
39 years with a qualifying day
Days at or above 30 C (86 F) per year at South Mtn. Days per year at South Mtn. with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 27 in 2021. 01020301986: 71987: 51988: 141989: 121990: 111991: 41992: 91994: 151996: 111997: 21998: 141999: 32000: 92001: 102002: 62003: 192004: 92005: 122006: 182007: 262008: 92009: 82010: 52011: 32012: 152013: 152014: 62015: 122016: 62017: 202018: 142019: 62020: 102021: 272022: 242023: 102024: 152025: 32026: 161986199019962000200420082012201620202024
Days per year at South Mtn. with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 27 in 2021.
Days at or above 30 C (86 F) per year at South Mtn.
YearDaysDecade average
198679.5
198759.5
1988149.5
1989129.5
1990118.6
199148.6
199298.6
1994158.6
1996118.6
199728.6
1998148.6
199938.6
2000912.6
20011012.6
2002612.6
20031912.6
2004912.6
20051212.6
20061812.6
20072612.6
2008912.6
2009812.6
2010510.2
2011310.2
20121510.2
20131510.2
2014610.2
20151210.2
2016610.2
20172010.2
20181410.2
2019610.2
20201015
20212715
20222415
20231015
20241515
2025315
20261615
First to last qualifying date each year at South Mtn. For each year, a bar from the first to the last day at South Mtn. meeting 30 C (86 F). 1986: 2 July 1986 to 18 August 19861987: 14 July 1987 to 1 September 19871988: 19 June 1988 to 3 September 19881989: 6 July 1989 to 30 July 19891990: 29 June 1990 to 14 August 19901991: 28 July 1991 to 21 August 19911992: 31 July 1992 to 19 August 19921994: 9 July 1994 to 14 August 19941996: 23 July 1996 to 25 August 19961997: 3 August 1997 to 7 August 19971998: 16 July 1998 to 4 September 19981999: 13 July 1999 to 20 August 19992000: 21 July 2000 to 9 August 20002001: 2 July 2001 to 26 August 20012002: 26 June 2002 to 14 July 20022003: 10 July 2003 to 19 August 20032004: 14 July 2004 to 13 August 20042005: 12 July 2005 to 21 August 20052006: 27 June 2006 to 4 September 20062007: 4 July 2007 to 3 September 20072008: 29 June 2008 to 24 August 20082009: 17 July 2009 to 28 August 20092010: 28 June 2010 to 25 August 20102011: 24 July 2011 to 26 August 20112012: 8 July 2012 to 18 August 20122013: 28 June 2013 to 19 August 20132014: 2 July 2014 to 27 July 20142015: 26 June 2015 to 2 August 20152016: 27 June 2016 to 29 July 20162017: 4 July 2017 to 6 September 20172018: 9 July 2018 to 15 August 20182019: 22 July 2019 to 28 August 20192020: 30 July 2020 to 5 September 20202021: 3 June 2021 to 9 September 20212022: 12 July 2022 to 7 September 20222023: 15 July 2023 to 28 August 20232024: 9 July 2024 to 1 September 20242025: 1 July 2025 to 12 August 20252026: 10 July 2026 to 21 August 202619861991199820032008201320182023JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at South Mtn. meeting 30 C (86 F).
First to last qualifying date each year at South Mtn.
YearFirst dateLast date
19861986-07-021986-08-18
19871987-07-141987-09-01
19881988-06-191988-09-03
19891989-07-061989-07-30
19901990-06-291990-08-14
19911991-07-281991-08-21
19921992-07-311992-08-19
19941994-07-091994-08-14
19961996-07-231996-08-25
19971997-08-031997-08-07
19981998-07-161998-09-04
19991999-07-131999-08-20
20002000-07-212000-08-09
20012001-07-022001-08-26
20022002-06-262002-07-14
20032003-07-102003-08-19
20042004-07-142004-08-13
20052005-07-122005-08-21
20062006-06-272006-09-04
20072007-07-042007-09-03
20082008-06-292008-08-24
20092009-07-172009-08-28
20102010-06-282010-08-25
20112011-07-242011-08-26
20122012-07-082012-08-18
20132013-06-282013-08-19
20142014-07-022014-07-27
20152015-06-262015-08-02
20162016-06-272016-07-29
20172017-07-042017-09-06
20182018-07-092018-08-15
20192019-07-222019-08-28
20202020-07-302020-09-05
20212021-06-032021-09-09
20222022-07-122022-09-07
20232023-07-152023-08-28
20242024-07-092024-09-01
20252025-07-012025-08-12
20262026-07-102026-08-21

Every Fixed Threshold

Fixed thresholds at South Mtn.
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3927202116
35 C (95 F): Days5119901
90 F (32.2 C): Days30920073
0 C (32 F): Ice days (max42102198514
0 C (32 F): Frost days (min34195201177
-10 C (14 F): Days with min343520082
-20 C (-4 F): Days with min5219971
20 C (68 F): Tropical nights (min21720036
10 mm (0.39 in): Days with 10 mm or more rain4552199614
25 mm (0.98 in): Days with 25 mm or more rain451220053
50 mm (1.97 in): Days with 50 mm or more rain8119861

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1986.

Download the Data

  • Data for South Mtn. 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).