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

Attu Threshold Days by Year (USC00500452)

9 fixed thresholds counted per year at Attu (USC00500452): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Attu Thresholds

  • Attu: days with a maximum temperature at or below 0 C (32 F) in 17 years, most in 1964 with 49.
  • Attu: nights with a minimum temperature at or below 0 C (32 F) in 17 years, most in 1985 with 174.
  • Attu: days with 10 mm (0.39 in) or more of precipitation in 17 years, most in 1965 with 63.
  • Attu: days with 25 mm (0.98 in) or more of precipitation in 16 years, most in 1965 with 25.
  • 9 fixed thresholds have at least one qualifying day at Attu.
17 years with a qualifying day
Nights at or below 0 C (32 F) per year at Attu Days per year at Attu with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 174 in 1985. 0501001502001948: 1141955: 1371956: 1261957: 1321961: 1301962: 1191963: 1001964: 1711965: 1331966: 1281967: 1431968: 1381969: 1421970: 1431973: 1641985: 1741988: 166194819561961196319651967196919731988
Days per year at Attu with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 174 in 1985.
Nights at or below 0 C (32 F) per year at Attu
YearDaysDecade average
1948114114
1955137131.7
1956126131.7
1957132131.7
1961130133.8
1962119133.8
1963100133.8
1964171133.8
1965133133.8
1966128133.8
1967143133.8
1968138133.8
1969142133.8
1970143153.5
1973164153.5
1985174170
1988166170
First to last qualifying date each year at Attu For each year, a bar from the first to the last day at Attu meeting 0 C (32 F). 1948: 1 January 1948 to 31 December 19481955: 1 January 1955 to 29 December 19551956: 5 January 1956 to 31 December 19561957: 1 January 1957 to 31 December 19571961: 7 January 1961 to 31 December 19611962: 1 January 1962 to 31 December 19621963: 1 January 1963 to 31 December 19631964: 1 January 1964 to 29 December 19641965: 4 January 1965 to 24 December 19651966: 2 January 1966 to 31 December 19661967: 1 January 1967 to 31 December 19671968: 1 January 1968 to 26 December 19681969: 11 January 1969 to 31 December 19691970: 2 January 1970 to 31 December 19701973: 1 January 1973 to 31 December 19731985: 1 January 1985 to 31 December 19851988: 15 January 1988 to 31 December 1988194819571963196619691985JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Attu meeting 0 C (32 F).
First to last qualifying date each year at Attu
YearFirst dateLast date
19481948-01-011948-12-31
19551955-01-011955-12-29
19561956-01-051956-12-31
19571957-01-011957-12-31
19611961-01-071961-12-31
19621962-01-011962-12-31
19631963-01-011963-12-31
19641964-01-011964-12-29
19651965-01-041965-12-24
19661966-01-021966-12-31
19671967-01-011967-12-31
19681968-01-011968-12-26
19691969-01-111969-12-31
19701970-01-021970-12-31
19731973-01-011973-12-31
19851985-01-011985-12-31
19881988-01-151988-12-31

Every Fixed Threshold

Fixed thresholds at Attu
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
0 C (32 F): Ice days (max1749196433
0 C (32 F): Frost days (min171741985166
-10 C (14 F): Days with min311198512
10 mm (0.39 in): Days with 10 mm or more rain1763196512
25 mm (0.98 in): Days with 25 mm or more rain1625196510
50 mm (1.97 in): Days with 50 mm or more rain13619653
100 mm (3.94 in): Days with 100 mm or more rain2219731
10 cm (3.9 in): Days with 10 cm or more snowfall10719553
25 cm (9.8 in): Days with 25 cm or more snowfall3219561

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 Attu 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).