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Built 2026-10-19 (19 October 2026)

County Line Threshold Days by Year (USS0018D08S)

12 fixed thresholds counted per year at County Line (USS0018D08S): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for County Line Thresholds

  • County Line: days with 10 mm (0.39 in) or more of precipitation in 46 years, most in 1984 with 29.
  • County Line: days with a maximum temperature at or below 0 C (32 F) in 37 years, most in 2007 with 44.
  • County Line: days with a maximum temperature at or above 30 C (86 F) in 36 years, most in 2017 with 27.
  • County Line: nights with a minimum temperature at or below 0 C (32 F) in 36 years, most in 1996 with 193.
  • 12 fixed thresholds have at least one qualifying day at County Line.
36 years with a qualifying day
Days at or above 30 C (86 F) per year at County Line Days per year at County Line with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 27 in 2017. 01020301990: 141991: 41992: 141994: 131995: 41996: 201997: 71998: 251999: 82000: 82001: 132002: 82003: 212004: 122005: 142006: 152007: 152008: 62009: 122010: 32011: 52012: 72013: 82014: 82015: 162016: 12017: 272018: 132019: 52020: 102021: 262022: 202023: 102024: 262025: 152026: 16199019951999200320072011201520192023
Days per year at County Line with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 27 in 2017.
Days at or above 30 C (86 F) per year at County Line
YearDaysDecade average
19901412.1
1991412.1
19921412.1
19941312.1
1995412.1
19962012.1
1997712.1
19982512.1
1999812.1
2000812.4
20011312.4
2002812.4
20032112.4
20041212.4
20051412.4
20061512.4
20071512.4
2008612.4
20091212.4
201039.3
201159.3
201279.3
201389.3
201489.3
2015169.3
201619.3
2017279.3
2018139.3
201959.3
20201017.6
20212617.6
20222017.6
20231017.6
20242617.6
20251517.6
20261617.6
First to last qualifying date each year at County Line For each year, a bar from the first to the last day at County Line meeting 30 C (86 F). 1990: 10 July 1990 to 10 September 19901991: 3 July 1991 to 30 August 19911992: 22 June 1992 to 22 September 19921994: 20 July 1994 to 14 August 19941995: 28 July 1995 to 15 September 19951996: 13 July 1996 to 11 September 19961997: 3 August 1997 to 9 September 19971998: 16 July 1998 to 15 September 19981999: 26 July 1999 to 27 August 19992000: 30 July 2000 to 14 September 20002001: 3 July 2001 to 23 September 20012002: 26 June 2002 to 14 September 20022003: 29 June 2003 to 5 September 20032004: 14 July 2004 to 15 August 20042005: 15 July 2005 to 28 August 20052006: 27 June 2006 to 5 September 20062007: 4 July 2007 to 30 August 20072008: 29 June 2008 to 17 August 20082009: 22 July 2009 to 23 September 20092010: 25 July 2010 to 25 August 20102011: 21 August 2011 to 24 September 20112012: 8 July 2012 to 8 September 20122013: 1 July 2013 to 15 August 20132014: 13 July 2014 to 11 August 20142015: 26 June 2015 to 12 September 20152016: 29 July 2016 to 29 July 20162017: 25 June 2017 to 6 September 20172018: 13 July 2018 to 16 August 20182019: 23 July 2019 to 5 September 20192020: 21 July 2020 to 4 September 20202021: 26 June 2021 to 9 September 20212022: 27 June 2022 to 6 September 20222023: 15 July 2023 to 28 August 20232024: 7 July 2024 to 28 September 20242025: 1 July 2025 to 4 September 20252026: 7 July 2026 to 26 August 202619901996200120062011201620212026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at County Line meeting 30 C (86 F).
First to last qualifying date each year at County Line
YearFirst dateLast date
19901990-07-101990-09-10
19911991-07-031991-08-30
19921992-06-221992-09-22
19941994-07-201994-08-14
19951995-07-281995-09-15
19961996-07-131996-09-11
19971997-08-031997-09-09
19981998-07-161998-09-15
19991999-07-261999-08-27
20002000-07-302000-09-14
20012001-07-032001-09-23
20022002-06-262002-09-14
20032003-06-292003-09-05
20042004-07-142004-08-15
20052005-07-152005-08-28
20062006-06-272006-09-05
20072007-07-042007-08-30
20082008-06-292008-08-17
20092009-07-222009-09-23
20102010-07-252010-08-25
20112011-08-212011-09-24
20122012-07-082012-09-08
20132013-07-012013-08-15
20142014-07-132014-08-11
20152015-06-262015-09-12
20162016-07-292016-07-29
20172017-06-252017-09-06
20182018-07-132018-08-16
20192019-07-232019-09-05
20202020-07-212020-09-04
20212021-06-262021-09-09
20222022-06-272022-09-06
20232023-07-152023-08-28
20242024-07-072024-09-28
20252025-07-012025-09-04
20262026-07-072026-08-26

Every Fixed Threshold

Fixed thresholds at County Line
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3627201716
35 C (95 F): Days10420021
90 F (32.2 C): Days311519983
0 C (32 F): Ice days (max374420076
0 C (32 F): Frost days (min36193199690
-10 C (14 F): Days with min364119933
-20 C (-4 F): Days with min19719903
-30 C (-22 F): Days with min1319903
20 C (68 F): Tropical nights (min4120061
10 mm (0.39 in): Days with 10 mm or more rain4629198410
25 mm (0.98 in): Days with 25 mm or more rain31319842
50 mm (1.97 in): Days with 50 mm or more rain2119931

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1990.

Download the Data

  • Data for County Line 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).