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Built 2026-10-19 (19 October 2026)

Alder Dam Camp Threshold Days by Year (USC00450094)

12 fixed thresholds counted per year at Alder Dam Camp (USC00450094): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Alder Dam Camp Thresholds

  • Alder Dam Camp: nights with a minimum temperature at or below 0 C (32 F) in 37 years, most in 1935 with 153.
  • Alder Dam Camp: days with a maximum temperature at or above 30 C (86 F) in 35 years, most in 1939 with 20.
  • Alder Dam Camp: days with 10 mm (0.39 in) or more of precipitation in 34 years, most in 1933 with 54.
  • Alder Dam Camp: days with 25 mm (0.98 in) or more of precipitation in 34 years, most in 1933 with 14.
  • 12 fixed thresholds have at least one qualifying day at Alder Dam Camp.
35 years with a qualifying day
Days at or above 30 C (86 F) per year at Alder Dam Camp Days per year at Alder Dam Camp with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 20 in 1939. 051015201917: 81918: 31919: 41920: 51922: 91923: 31925: 71926: 91927: 111928: 91929: 61930: 41931: 71932: 71933: 51934: 81935: 151936: 31937: 51938: 141939: 201940: 171941: 171942: 111943: 141944: 151945: 191946: 91947: 61948: 11949: 61950: 111951: 121952: 161953: 6191719221927193119351939194319471951
Days per year at Alder Dam Camp with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 20 in 1939.
Days at or above 30 C (86 F) per year at Alder Dam Camp
YearDaysDecade average
191785
191835
191945
192057.4
192297.4
192337.4
192577.4
192697.4
1927117.4
192897.4
192967.4
193048.8
193178.8
193278.8
193358.8
193488.8
1935158.8
193638.8
193758.8
1938148.8
1939208.8
19401711.5
19411711.5
19421111.5
19431411.5
19441511.5
19451911.5
1946911.5
1947611.5
1948111.5
1949611.5
19501111.3
19511211.3
19521611.3
1953611.3
First to last qualifying date each year at Alder Dam Camp For each year, a bar from the first to the last day at Alder Dam Camp meeting 30 C (86 F). 1917: 14 July 1917 to 16 August 19171918: 1 August 1918 to 31 August 19181919: 14 July 1919 to 16 August 19191920: 7 July 1920 to 14 August 19201922: 30 May 1922 to 11 September 19221923: 28 June 1923 to 15 August 19231925: 24 June 1925 to 23 September 19251926: 23 June 1926 to 23 August 19261927: 16 July 1927 to 17 August 19271928: 21 July 1928 to 22 September 19281929: 29 July 1929 to 16 September 19291930: 15 June 1930 to 14 August 19301931: 6 June 1931 to 28 August 19311932: 10 June 1932 to 4 October 19321933: 15 July 1933 to 26 August 19331934: 13 May 1934 to 3 September 19341935: 6 June 1935 to 8 September 19351936: 26 May 1936 to 29 August 19361937: 28 June 1937 to 14 September 19371938: 6 June 1938 to 17 September 19381939: 13 May 1939 to 23 August 19391940: 30 May 1940 to 24 September 19401941: 11 June 1941 to 20 August 19411942: 30 June 1942 to 22 August 19421943: 24 July 1943 to 1 October 19431944: 18 July 1944 to 11 September 19441945: 18 June 1945 to 13 September 19451946: 19 July 1946 to 23 August 19461947: 26 May 1947 to 22 September 19471948: 7 June 1948 to 7 June 19481949: 14 July 1949 to 28 August 19491950: 21 July 1950 to 22 September 19501951: 29 June 1951 to 16 September 19511952: 8 July 1952 to 23 September 19521953: 5 May 1953 to 15 August 19531917192319291934193919441949JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Alder Dam Camp meeting 30 C (86 F).
First to last qualifying date each year at Alder Dam Camp
YearFirst dateLast date
19171917-07-141917-08-16
19181918-08-011918-08-31
19191919-07-141919-08-16
19201920-07-071920-08-14
19221922-05-301922-09-11
19231923-06-281923-08-15
19251925-06-241925-09-23
19261926-06-231926-08-23
19271927-07-161927-08-17
19281928-07-211928-09-22
19291929-07-291929-09-16
19301930-06-151930-08-14
19311931-06-061931-08-28
19321932-06-101932-10-04
19331933-07-151933-08-26
19341934-05-131934-09-03
19351935-06-061935-09-08
19361936-05-261936-08-29
19371937-06-281937-09-14
19381938-06-061938-09-17
19391939-05-131939-08-23
19401940-05-301940-09-24
19411941-06-111941-08-20
19421942-06-301942-08-22
19431943-07-241943-10-01
19441944-07-181944-09-11
19451945-06-181945-09-13
19461946-07-191946-08-23
19471947-05-261947-09-22
19481948-06-071948-06-07
19491949-07-141949-08-28
19501950-07-211950-09-22
19511951-06-291951-09-16
19521952-07-081952-09-23
19531953-05-051953-08-15

Every Fixed Threshold

Fixed thresholds at Alder Dam Camp
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days352019396
35 C (95 F): Days8519445
90 F (32.2 C): Days271119447
0 C (32 F): Ice days (max251619502
0 C (32 F): Frost days (min37153193556
-10 C (14 F): Days with min221419502
-20 C (-4 F): Days with min1119301
10 mm (0.39 in): Days with 10 mm or more rain3454193347
25 mm (0.98 in): Days with 25 mm or more rain341419338
50 mm (1.97 in): Days with 50 mm or more rain10419332
10 cm (3.9 in): Days with 10 cm or more snowfall13319292
25 cm (9.8 in): Days with 25 cm or more snowfall2119211

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1917.

Download the Data

  • Data for Alder Dam Camp 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).