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Data as of 2025-12-31
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Built 2026-10-18 (18 October 2026)

Mercer Rs Threshold Days by Year

16 fixed thresholds counted per year at Mercer Rs (USC00475352): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mercer Rs Thresholds

  • Mercer Rs: days with a maximum temperature at or above 30 C (86 F) in 8 years, most in 1947 with 14.
  • Mercer Rs: days with a maximum temperature at or below 0 C (32 F) in 8 years, most in 2014 with 123.
  • Mercer Rs: nights with a minimum temperature at or below 0 C (32 F) in 7 years, most in 2014 with 206.
  • Mercer Rs: nights with a minimum temperature at or below -10 C (14 F) in 7 years, most in 2014 with 119.
  • 16 fixed thresholds have at least one qualifying day at Mercer Rs.
8 years with a qualifying day
Days at or above 30 C (86 F) per year at Mercer Rs Days per year at Mercer Rs with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 14 in 1947. 0510151942: 41947: 142010: 82011: 112012: 82014: 22015: 42025: 1019421947201020112012201420152025
Days per year at Mercer Rs with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 14 in 1947.
Days at or above 30 C (86 F) per year at Mercer Rs
YearDaysDecade average
194249
1947149
201086.6
2011116.6
201286.6
201426.6
201546.6
20251010
First to last qualifying date each year at Mercer Rs For each year, a bar from the first to the last day at Mercer Rs meeting 30 C (86 F). 1942: 13 July 1942 to 22 August 19421947: 11 July 1947 to 7 September 19472010: 24 May 2010 to 30 August 20102011: 6 June 2011 to 22 July 20112012: 9 June 2012 to 4 September 20122014: 31 May 2014 to 21 July 20142015: 27 July 2015 to 5 September 20152025: 3 June 2025 to 8 August 202519421947201020112012201420152025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Mercer Rs meeting 30 C (86 F).
First to last qualifying date each year at Mercer Rs
YearFirst dateLast date
19421942-07-131942-08-22
19471947-07-111947-09-07
20102010-05-242010-08-30
20112011-06-062011-07-22
20122012-06-092012-09-04
20142014-05-312014-07-21
20152015-07-272015-09-05
20252025-06-032025-08-08

Every Fixed Threshold

Fixed thresholds at Mercer Rs
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days814194710
35 C (95 F): Days1119471
90 F (32.2 C): Days5619472
0 C (32 F): Ice days (max8123201493
0 C (32 F): Frost days (min72062014185
-10 C (14 F): Days with min7119201488
-20 C (-4 F): Days with min760201435
-30 C (-22 F): Days with min61520143
20 C (68 F): Tropical nights (min4519473
25 C (77 F): Days with min1120251
10 mm (0.39 in): Days with 10 mm or more rain426195011
25 mm (0.98 in): Days with 25 mm or more rain4819494
50 mm (1.97 in): Days with 50 mm or more rain2319491
100 mm (3.94 in): Days with 100 mm or more rain1119491
10 cm (3.9 in): Days with 10 cm or more snowfall2320253
25 cm (9.8 in): Days with 25 cm or more snowfall1220252

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1942.

Download the Data

  • Data for Mercer Rs 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).