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

NAS Threshold Days by Year (SWE00139368)

3 fixed thresholds counted per year at NAS (SWE00139368): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for NAS Thresholds

  • NAS: days with 10 mm (0.39 in) or more of precipitation in 33 years, most in 1957 with 21.
  • NAS: days with 25 mm (0.98 in) or more of precipitation in 22 years, most in 1965 with 5.
  • NAS: days with 50 mm (1.97 in) or more of precipitation in 3 years, most in 1951 with 2.
  • 3 fixed thresholds have at least one qualifying day at NAS.
33 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at NAS Days per year at NAS with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 21 in 1957. 01020301948: 141949: 131950: 171951: 121952: 111953: 121954: 171955: 101956: 141957: 211958: 141959: 61960: 171961: 161962: 121963: 171964: 101965: 171966: 161967: 161968: 131969: 101970: 141971: 171972: 171973: 121974: 141975: 131976: 81977: 181978: 41979: 121980: 21194819521956196019641968197219761980
Days per year at NAS with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 21 in 1957.
Days with 10 mm (0.39 in) or more of precipitation per year at NAS
YearDaysDecade average
19481413.5
19491313.5
19501713.4
19511213.4
19521113.4
19531213.4
19541713.4
19551013.4
19561413.4
19572113.4
19581413.4
1959613.4
19601714.4
19611614.4
19621214.4
19631714.4
19641014.4
19651714.4
19661614.4
19671614.4
19681314.4
19691014.4
19701412.9
19711712.9
19721712.9
19731212.9
19741412.9
19751312.9
1976812.9
19771812.9
1978412.9
19791212.9
19802121
First to last qualifying date each year at NAS For each year, a bar from the first to the last day at NAS meeting 10 mm (0.39 in). 1948: 6 January 1948 to 5 November 19481949: 7 January 1949 to 29 December 19491950: 8 April 1950 to 23 November 19501951: 14 March 1951 to 8 November 19511952: 7 April 1952 to 2 December 19521953: 31 January 1953 to 28 September 19531954: 20 January 1954 to 12 December 19541955: 2 May 1955 to 17 December 19551956: 21 January 1956 to 3 October 19561957: 1 February 1957 to 7 November 19571958: 18 January 1958 to 3 October 19581959: 10 January 1959 to 3 December 19591960: 5 January 1960 to 10 October 19601961: 6 February 1961 to 30 December 19611962: 22 January 1962 to 5 September 19621963: 15 April 1963 to 18 November 19631964: 19 June 1964 to 13 December 19641965: 19 March 1965 to 26 November 19651966: 29 January 1966 to 10 December 19661967: 31 January 1967 to 22 December 19671968: 5 May 1968 to 3 November 19681969: 10 April 1969 to 26 September 19691970: 17 March 1970 to 19 November 19701971: 31 January 1971 to 29 November 19711972: 21 January 1972 to 5 December 19721973: 12 February 1973 to 18 November 19731974: 29 January 1974 to 16 November 19741975: 16 May 1975 to 2 December 19751976: 15 June 1976 to 3 December 19761977: 1 January 1977 to 8 November 19771978: 30 January 1978 to 15 November 19781979: 3 February 1979 to 28 December 19791980: 29 March 1980 to 18 November 19801948195319581963196819731978JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at NAS meeting 10 mm (0.39 in).
First to last qualifying date each year at NAS
YearFirst dateLast date
19481948-01-061948-11-05
19491949-01-071949-12-29
19501950-04-081950-11-23
19511951-03-141951-11-08
19521952-04-071952-12-02
19531953-01-311953-09-28
19541954-01-201954-12-12
19551955-05-021955-12-17
19561956-01-211956-10-03
19571957-02-011957-11-07
19581958-01-181958-10-03
19591959-01-101959-12-03
19601960-01-051960-10-10
19611961-02-061961-12-30
19621962-01-221962-09-05
19631963-04-151963-11-18
19641964-06-191964-12-13
19651965-03-191965-11-26
19661966-01-291966-12-10
19671967-01-311967-12-22
19681968-05-051968-11-03
19691969-04-101969-09-26
19701970-03-171970-11-19
19711971-01-311971-11-29
19721972-01-211972-12-05
19731973-02-121973-11-18
19741974-01-291974-11-16
19751975-05-161975-12-02
19761976-06-151976-12-03
19771977-01-011977-11-08
19781978-01-301978-11-15
19791979-02-031979-12-28
19801980-03-291980-11-18

Every Fixed Threshold

Fixed thresholds at NAS
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3321195721
25 mm (0.98 in): Days with 25 mm or more rain22519653
50 mm (1.97 in): Days with 50 mm or more rain3219511

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1948.

Download the Data

  • Data for NAS 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).