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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Swannanoa 2 E Threshold Days by Year (USC00318442)

14 fixed thresholds counted per year at Swannanoa 2 E (USC00318442): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Swannanoa 2 E Thresholds

  • Swannanoa 2 E: days with 10 mm (0.39 in) or more of precipitation in 50 years, most in 1967 with 47.
  • Swannanoa 2 E: days with 25 mm (0.98 in) or more of precipitation in 50 years, most in 1964 with 19.
  • Swannanoa 2 E: days with 50 mm (1.97 in) or more of precipitation in 43 years, most in 1940 with 7.
  • Swannanoa 2 E: days with 10 cm (3.9 in) or more of snowfall in 15 years, most in 1940 with 3.
  • 14 fixed thresholds have at least one qualifying day at Swannanoa 2 E.
12 years with a qualifying day
Days at or above 30 C (86 F) per year at Swannanoa 2 E Days per year at Swannanoa 2 E with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 81 in 1933. 02550751001932: 661933: 811934: 611935: 401936: 701937: 551938: 311939: 441940: 361941: 431942: 291943: 42193219341936193819401942
Days per year at Swannanoa 2 E with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 81 in 1933.
Days at or above 30 C (86 F) per year at Swannanoa 2 E
YearDaysDecade average
19326656
19338156
19346156
19354056
19367056
19375556
19383156
19394456
19403637.5
19414337.5
19422937.5
19434237.5
First to last qualifying date each year at Swannanoa 2 E For each year, a bar from the first to the last day at Swannanoa 2 E meeting 30 C (86 F). 1932: 5 May 1932 to 16 September 19321933: 11 May 1933 to 1 October 19331934: 5 May 1934 to 10 September 19341935: 2 May 1935 to 22 September 19351936: 8 May 1936 to 22 September 19361937: 23 April 1937 to 5 September 19371938: 3 May 1938 to 26 August 19381939: 24 May 1939 to 29 September 19391940: 6 May 1940 to 22 September 19401941: 16 May 1941 to 7 October 19411942: 5 April 1942 to 19 September 19421943: 20 May 1943 to 15 September 1943193219341936193819401942JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Swannanoa 2 E meeting 30 C (86 F).
First to last qualifying date each year at Swannanoa 2 E
YearFirst dateLast date
19321932-05-051932-09-16
19331933-05-111933-10-01
19341934-05-051934-09-10
19351935-05-021935-09-22
19361936-05-081936-09-22
19371937-04-231937-09-05
19381938-05-031938-08-26
19391939-05-241939-09-29
19401940-05-061940-09-22
19411941-05-161941-10-07
19421942-04-051942-09-19
19431943-05-201943-09-15

Every Fixed Threshold

Fixed thresholds at Swannanoa 2 E
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days1281193342
35 C (95 F): Days5919321
90 F (32.2 C): Days123619329
0 C (32 F): Ice days (max11719355
0 C (32 F): Frost days (min121301940113
-10 C (14 F): Days with min1220194016
-20 C (-4 F): Days with min2119401
20 C (68 F): Tropical nights (min9319331
10 mm (0.39 in): Days with 10 mm or more rain5047196728
25 mm (0.98 in): Days with 25 mm or more rain501919648
50 mm (1.97 in): Days with 50 mm or more rain43719402
100 mm (3.94 in): Days with 100 mm or more rain6219401
10 cm (3.9 in): Days with 10 cm or more snowfall15319403
25 cm (9.8 in): Days with 25 cm or more snowfall2119421

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1932.

Download the Data

  • Data for Swannanoa 2 E 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 (2025-12-31).