Daily records
Page built 2026-10-15
Data as of 2026-10-13
Search
Built 2026-10-15 (15 October 2026)

Shannon Hec Threshold Days by Year

10 fixed thresholds counted per year at Shannon Hec (ASN00096021): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Shannon Hec Thresholds

  • Shannon Hec: days with 10 mm (0.39 in) or more of precipitation in 50 years, most in 1928 with 38.
  • Shannon Hec: days with 25 mm (0.98 in) or more of precipitation in 46 years, most in 1947 with 8.
  • Shannon Hec: nights with a minimum temperature at or below 0 C (32 F) in 18 years, most in 1967 with 148.
  • Shannon Hec: days with 50 mm (1.97 in) or more of precipitation in 12 years, most in 1946 with 2.
  • 10 fixed thresholds have at least one qualifying day at Shannon Hec.
6 years with a qualifying day
Days at or above 30 C (86 F) per year at Shannon Hec Days per year at Shannon Hec with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 3 in 1959. 01231959: 31960: 21961: 31967: 11968: 21982: 2195919601961196719681982
Days per year at Shannon Hec with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 3 in 1959.
Days at or above 30 C (86 F) per year at Shannon Hec
YearDaysDecade average
195933
196022
196132
196712
196822
198222
First to last qualifying date each year at Shannon Hec For each year, a bar from the first to the last day at Shannon Hec meeting 30 C (86 F). 1959: 17 January 1959 to 24 January 19591960: 15 January 1960 to 16 January 19601961: 25 January 1961 to 28 January 19611967: 7 February 1967 to 7 February 19671968: 31 January 1968 to 25 February 19681982: 24 January 1982 to 15 February 1982195919601961196719681982JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Shannon Hec meeting 30 C (86 F).
First to last qualifying date each year at Shannon Hec
YearFirst dateLast date
19591959-01-171959-01-24
19601960-01-151960-01-16
19611961-01-251961-01-28
19671967-02-071967-02-07
19681968-01-311968-02-25
19821982-01-241982-02-15

Every Fixed Threshold

Fixed thresholds at Shannon Hec
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days6319592
90 F (32.2 C): Days1119821
0 C (32 F): Ice days (max11519611
0 C (32 F): Frost days (min181481967114
-10 C (14 F): Days with min1119821
20 C (68 F): Tropical nights (min1119591
10 mm (0.39 in): Days with 10 mm or more rain5038192817
25 mm (0.98 in): Days with 25 mm or more rain46819474
50 mm (1.97 in): Days with 50 mm or more rain12219461
100 mm (3.94 in): Days with 100 mm or more rain2219602

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1959.

Download the Data

  • Data for Shannon Hec 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 2026-10-13 (13 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2026-10-13).