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

Upper Dam Threshold Days by Year (USC00178942)

11 fixed thresholds counted per year at Upper Dam (USC00178942): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Upper Dam Thresholds

  • Upper Dam: days with 10 mm (0.39 in) or more of precipitation in 30 years, most in 1954 with 52.
  • Upper Dam: days with 25 mm (0.98 in) or more of precipitation in 30 years, most in 1976 with 12.
  • Upper Dam: days with 50 mm (1.97 in) or more of precipitation in 6 years, most in 1950 with 2.
  • Upper Dam: days with 10 cm (3.9 in) or more of snowfall in 4 years, most in 1951 with 10.
  • 11 fixed thresholds have at least one qualifying day at Upper Dam.
3 years with a qualifying day
Days at or above 30 C (86 F) per year at Upper Dam Days per year at Upper Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 5 in 2013. 02462011: 22012: 32013: 5201120122013
Days per year at Upper Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 5 in 2013.
Days at or above 30 C (86 F) per year at Upper Dam
YearDaysDecade average
201123.3
201233.3
201353.3
First to last qualifying date each year at Upper Dam For each year, a bar from the first to the last day at Upper Dam meeting 30 C (86 F). 2011: 22 July 2011 to 23 July 20112012: 22 June 2012 to 16 July 20122013: 15 July 2013 to 20 July 2013201120122013JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Upper Dam meeting 30 C (86 F).
First to last qualifying date each year at Upper Dam
YearFirst dateLast date
20112011-07-222011-07-23
20122012-06-222012-07-16
20132013-07-152013-07-20

Every Fixed Threshold

Fixed thresholds at Upper Dam
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3520135
0 C (32 F): Ice days (max376201165
0 C (32 F): Frost days (min31782012158
-10 C (14 F): Days with min380201161
-20 C (-4 F): Days with min322201117
10 mm (0.39 in): Days with 10 mm or more rain3052195426
25 mm (0.98 in): Days with 25 mm or more rain301219765
50 mm (1.97 in): Days with 50 mm or more rain6219501
100 mm (3.94 in): Days with 100 mm or more rain1120111
10 cm (3.9 in): Days with 10 cm or more snowfall41019513
25 cm (9.8 in): Days with 25 cm or more snowfall2220121

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 2011.

Download the Data

  • Data for Upper Dam 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).