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Built 2026-10-19 (19 October 2026)

Alder 17 S Threshold Days by Year (USC00240110)

15 fixed thresholds counted per year at Alder 17 S (USC00240110): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Alder 17 S Thresholds

  • Alder 17 S: days with a maximum temperature at or below 0 C (32 F) in 51 years, most in 1979 with 68.
  • Alder 17 S: nights with a minimum temperature at or below 0 C (32 F) in 51 years, most in 1975 with 251.
  • Alder 17 S: nights with a minimum temperature at or below -10 C (14 F) in 51 years, most in 1985 with 97.
  • Alder 17 S: nights with a minimum temperature at or below -20 C (-4 F) in 51 years, most in 1979 with 23.
  • 15 fixed thresholds have at least one qualifying day at Alder 17 S.
50 years with a qualifying day
Days at or above 30 C (86 F) per year at Alder 17 S Days per year at Alder 17 S with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 36 in 2003. 0102030401957: 251958: 131959: 231960: 191961: 241962: 51963: 171964: 181965: 81966: 281967: 211968: 181969: 191970: 281971: 231972: 71973: 181974: 261975: 71976: 131977: 51978: 81979: 111980: 51981: 131982: 71983: 91984: 41985: 61986: 41987: 61988: 171989: 111990: 151991: 121992: 41994: 131995: 91996: 121997: 61998: 191999: 122000: 222001: 152002: 142003: 362004: 112005: 192006: 142007: 341957196219671972197719821987199219982003
Days per year at Alder 17 S with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 36 in 2003.
Days at or above 30 C (86 F) per year at Alder 17 S
YearDaysDecade average
19572520.3
19581320.3
19592320.3
19601917.7
19612417.7
1962517.7
19631717.7
19641817.7
1965817.7
19662817.7
19672117.7
19681817.7
19691917.7
19702814.6
19712314.6
1972714.6
19731814.6
19742614.6
1975714.6
19761314.6
1977514.6
1978814.6
19791114.6
198058.2
1981138.2
198278.2
198398.2
198448.2
198568.2
198648.2
198768.2
1988178.2
1989118.2
19901511.3
19911211.3
1992411.3
19941311.3
1995911.3
19961211.3
1997611.3
19981911.3
19991211.3
20002220.6
20011520.6
20021420.6
20033620.6
20041120.6
20051920.6
20061420.6
20073420.6
First to last qualifying date each year at Alder 17 S For each year, a bar from the first to the last day at Alder 17 S meeting 30 C (86 F). 1957: 9 July 1957 to 25 August 19571958: 22 July 1958 to 8 September 19581959: 12 June 1959 to 11 September 19591960: 10 May 1960 to 20 August 19601961: 17 June 1961 to 22 August 19611962: 25 June 1962 to 14 August 19621963: 3 July 1963 to 12 September 19631964: 8 July 1964 to 18 August 19641965: 15 July 1965 to 11 August 19651966: 28 June 1966 to 9 September 19661967: 12 July 1967 to 5 September 19671968: 6 July 1968 to 10 September 19681969: 5 June 1969 to 2 September 19691970: 23 June 1970 to 26 August 19701971: 23 June 1971 to 28 August 19711972: 13 July 1972 to 12 August 19721973: 4 July 1973 to 20 August 19731974: 13 June 1974 to 18 August 19741975: 3 July 1975 to 28 July 19751976: 29 June 1976 to 5 September 19761977: 6 June 1977 to 18 July 19771978: 23 July 1978 to 2 September 19781979: 29 June 1979 to 8 September 19791980: 21 July 1980 to 6 September 19801981: 4 July 1981 to 18 September 19811982: 21 July 1982 to 17 August 19821983: 30 July 1983 to 11 August 19831984: 17 July 1984 to 18 August 19841985: 4 July 1985 to 25 August 19851986: 17 June 1986 to 28 August 19861987: 14 June 1987 to 23 September 19871988: 19 June 1988 to 25 August 19881989: 3 July 1989 to 31 July 19891990: 23 June 1990 to 9 August 19901991: 13 July 1991 to 31 August 19911992: 1 August 1992 to 19 August 19921994: 9 July 1994 to 8 September 19941995: 8 July 1995 to 22 August 19951996: 4 July 1996 to 27 August 19961997: 15 July 1997 to 26 August 19971998: 16 July 1998 to 6 September 19981999: 6 July 1999 to 26 August 19992000: 12 July 2000 to 16 September 20002001: 1 July 2001 to 3 September 20012002: 26 June 2002 to 24 July 20022003: 28 May 2003 to 26 August 20032004: 13 July 2004 to 1 September 20042005: 8 July 2005 to 29 August 20052006: 15 July 2006 to 23 August 20062007: 20 June 2007 to 3 September 200719571964197119781985199220002007JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Alder 17 S meeting 30 C (86 F).
First to last qualifying date each year at Alder 17 S
YearFirst dateLast date
19571957-07-091957-08-25
19581958-07-221958-09-08
19591959-06-121959-09-11
19601960-05-101960-08-20
19611961-06-171961-08-22
19621962-06-251962-08-14
19631963-07-031963-09-12
19641964-07-081964-08-18
19651965-07-151965-08-11
19661966-06-281966-09-09
19671967-07-121967-09-05
19681968-07-061968-09-10
19691969-06-051969-09-02
19701970-06-231970-08-26
19711971-06-231971-08-28
19721972-07-131972-08-12
19731973-07-041973-08-20
19741974-06-131974-08-18
19751975-07-031975-07-28
19761976-06-291976-09-05
19771977-06-061977-07-18
19781978-07-231978-09-02
19791979-06-291979-09-08
19801980-07-211980-09-06
19811981-07-041981-09-18
19821982-07-211982-08-17
19831983-07-301983-08-11
19841984-07-171984-08-18
19851985-07-041985-08-25
19861986-06-171986-08-28
19871987-06-141987-09-23
19881988-06-191988-08-25
19891989-07-031989-07-31
19901990-06-231990-08-09
19911991-07-131991-08-31
19921992-08-011992-08-19
19941994-07-091994-09-08
19951995-07-081995-08-22
19961996-07-041996-08-27
19971997-07-151997-08-26
19981998-07-161998-09-06
19991999-07-061999-08-26
20002000-07-122000-09-16
20012001-07-012001-09-03
20022002-06-262002-07-24
20032003-05-282003-08-26
20042004-07-132004-09-01
20052005-07-082005-08-29
20062006-07-152006-08-23
20072007-06-202007-09-03

Every Fixed Threshold

Fixed thresholds at Alder 17 S
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days5036200334
35 C (95 F): Days10319612
90 F (32.2 C): Days4016200315
0 C (32 F): Ice days (max5168197959
0 C (32 F): Frost days (min512511975184
-10 C (14 F): Days with min5197198562
-20 C (-4 F): Days with min512319798
-30 C (-22 F): Days with min30619622
-40 C (-40 F): Days with min1119831
20 C (68 F): Tropical nights (min1120001
10 mm (0.39 in): Days with 10 mm or more rain5118200512
25 mm (0.98 in): Days with 25 mm or more rain30419752
50 mm (1.97 in): Days with 50 mm or more rain1119851
10 cm (3.9 in): Days with 10 cm or more snowfall41719826
25 cm (9.8 in): Days with 25 cm or more snowfall11119621

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1957.

Download the Data

  • Data for Alder 17 S 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).