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

Flattop Mtn. Threshold Days by Year (USS0013A19S)

12 fixed thresholds counted per year at Flattop Mtn. (USS0013A19S): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Flattop Mtn. Thresholds

  • Flattop Mtn.: days with 10 mm (0.39 in) or more of precipitation in 48 years, most in 2012 with 102.
  • Flattop Mtn.: days with 25 mm (0.98 in) or more of precipitation in 48 years, most in 1990 with 27.
  • Flattop Mtn.: days with a maximum temperature at or below 0 C (32 F) in 38 years, most in 1985 with 154.
  • Flattop Mtn.: days with 50 mm (1.97 in) or more of precipitation in 37 years, most in 1990 with 8.
  • 12 fixed thresholds have at least one qualifying day at Flattop Mtn..
7 years with a qualifying day
Days at or above 30 C (86 F) per year at Flattop Mtn. Days per year at Flattop Mtn. with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 2 in 2006. 011222002: 12006: 22007: 12008: 12015: 22018: 12021: 22002200620072008201520182021
Days per year at Flattop Mtn. with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 2 in 2006.
Days at or above 30 C (86 F) per year at Flattop Mtn.
YearDaysDecade average
200211.3
200621.3
200711.3
200811.3
201521.5
201811.5
202122
First to last qualifying date each year at Flattop Mtn. For each year, a bar from the first to the last day at Flattop Mtn. meeting 30 C (86 F). 2002: 13 July 2002 to 13 July 20022006: 22 July 2006 to 8 August 20062007: 6 July 2007 to 6 July 20072008: 18 August 2008 to 18 August 20082015: 28 June 2015 to 3 August 20152018: 10 August 2018 to 10 August 20182021: 29 June 2021 to 30 June 20212002200620072008201520182021JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Flattop Mtn. meeting 30 C (86 F).
First to last qualifying date each year at Flattop Mtn.
YearFirst dateLast date
20022002-07-132002-07-13
20062006-07-222006-08-08
20072007-07-062007-07-06
20082008-08-182008-08-18
20152015-06-282015-08-03
20182018-08-102018-08-10
20212021-06-292021-06-30

Every Fixed Threshold

Fixed thresholds at Flattop Mtn.
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days7220062
90 F (32.2 C): Days1120181
0 C (32 F): Ice days (max38154198546
0 C (32 F): Frost days (min342631999134
-10 C (14 F): Days with min34108199639
-20 C (-4 F): Days with min344619967
-30 C (-22 F): Days with min231119965
-40 C (-40 F): Days with min1220242
10 mm (0.39 in): Days with 10 mm or more rain48102201244
25 mm (0.98 in): Days with 25 mm or more rain4827199012
50 mm (1.97 in): Days with 50 mm or more rain37819902
100 mm (3.94 in): Days with 100 mm or more rain3220062

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 2002.

Download the Data

  • Data for Flattop 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).