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Data as of 2025-12-31
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Built 2026-10-17 (17 October 2026)

Port Mellon Threshold Days by Year

12 fixed thresholds counted per year at Port Mellon (CA001046330): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Port Mellon Thresholds

  • Port Mellon: days with 10 mm (0.39 in) or more of precipitation in 27 years, most in 1964 with 109.
  • Port Mellon: days with 25 mm (0.98 in) or more of precipitation in 27 years, most in 1975 with 58.
  • Port Mellon: days with 50 mm (1.97 in) or more of precipitation in 27 years, most in 1975 with 26.
  • Port Mellon: days with 100 mm (3.94 in) or more of precipitation in 22 years, most in 1947 with 6.
  • 12 fixed thresholds have at least one qualifying day at Port Mellon.
27 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Port Mellon Days per year at Port Mellon with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 109 in 1964. 0501001501943: 651944: 671945: 841946: 981947: 721948: 891952: 581964: 1091965: 831966: 1001967: 991968: 1051969: 941970: 741971: 961972: 871973: 961974: 1091975: 951976: 901977: 971978: 701979: 741980: 841981: 1031982: 901983: 97194319461952196619691972197519781981
Days per year at Port Mellon with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 109 in 1964.
Days with 10 mm (0.39 in) or more of precipitation per year at Port Mellon
YearDaysDecade average
19436579.2
19446779.2
19458479.2
19469879.2
19477279.2
19488979.2
19525858
196410998.3
19658398.3
196610098.3
19679998.3
196810598.3
19699498.3
19707488.8
19719688.8
19728788.8
19739688.8
197410988.8
19759588.8
19769088.8
19779788.8
19787088.8
19797488.8
19808493.5
198110393.5
19829093.5
19839793.5
First to last qualifying date each year at Port Mellon For each year, a bar from the first to the last day at Port Mellon meeting 10 mm (0.39 in). 1943: 18 January 1943 to 31 December 19431944: 1 January 1944 to 31 December 19441945: 4 January 1945 to 31 December 19451946: 1 January 1946 to 21 December 19461947: 1 February 1947 to 27 December 19471948: 1 January 1948 to 30 December 19481952: 5 January 1952 to 31 December 19521964: 2 January 1964 to 31 December 19641965: 1 January 1965 to 29 December 19651966: 1 January 1966 to 31 December 19661967: 2 January 1967 to 24 December 19671968: 6 January 1968 to 31 December 19681969: 3 January 1969 to 22 December 19691970: 8 January 1970 to 29 December 19701971: 9 January 1971 to 30 December 19711972: 7 January 1972 to 31 December 19721973: 1 January 1973 to 24 December 19731974: 12 January 1974 to 31 December 19741975: 2 January 1975 to 29 December 19751976: 2 January 1976 to 26 December 19761977: 11 January 1977 to 28 December 19771978: 3 January 1978 to 23 December 19781979: 9 January 1979 to 31 December 19791980: 2 January 1980 to 30 December 19801981: 8 January 1981 to 31 December 19811982: 1 January 1982 to 25 December 19821983: 1 January 1983 to 30 December 19831943194719651969197319771981JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Port Mellon meeting 10 mm (0.39 in).
First to last qualifying date each year at Port Mellon
YearFirst dateLast date
19431943-01-181943-12-31
19441944-01-011944-12-31
19451945-01-041945-12-31
19461946-01-011946-12-21
19471947-02-011947-12-27
19481948-01-011948-12-30
19521952-01-051952-12-31
19641964-01-021964-12-31
19651965-01-011965-12-29
19661966-01-011966-12-31
19671967-01-021967-12-24
19681968-01-061968-12-31
19691969-01-031969-12-22
19701970-01-081970-12-29
19711971-01-091971-12-30
19721972-01-071972-12-31
19731973-01-011973-12-24
19741974-01-121974-12-31
19751975-01-021975-12-29
19761976-01-021976-12-26
19771977-01-111977-12-28
19781978-01-031978-12-23
19791979-01-091979-12-31
19801980-01-021980-12-30
19811981-01-081981-12-31
19821982-01-011982-12-25
19831983-01-011983-12-30

Every Fixed Threshold

Fixed thresholds at Port Mellon
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days1219832
90 F (32.2 C): Days1119831
0 C (32 F): Ice days (max1419834
0 C (32 F): Frost days (min132198332
-10 C (14 F): Days with min1119831
10 mm (0.39 in): Days with 10 mm or more rain27109196497
25 mm (0.98 in): Days with 25 mm or more rain2758197556
50 mm (1.97 in): Days with 50 mm or more rain2726197519
100 mm (3.94 in): Days with 100 mm or more rain22619474
200 mm (7.87 in): Days with 200 mm or more rain2119751
10 cm (3.9 in): Days with 10 cm or more snowfall221319715
25 cm (9.8 in): Days with 25 cm or more snowfall12219691

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1983.

Download the Data

  • Data for Port Mellon 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).