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Data as of 2025-12-31
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Built 2026-10-17 (17 October 2026)

Copper Threshold Days by Year

5 fixed thresholds counted per year at Copper (USC00242012): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Copper Thresholds

  • Copper: days with 10 mm (0.39 in) or more of precipitation in 45 years, most in 1923 with 19.
  • Copper: days with 10 cm (3.9 in) or more of snowfall in 30 years, most in 1924 with 12.
  • Copper: days with 25 mm (0.98 in) or more of precipitation in 28 years, most in 1940 with 6.
  • Copper: days with 25 cm (9.8 in) or more of snowfall in 7 years, most in 1936 with 2.
  • 5 fixed thresholds have at least one qualifying day at Copper.
45 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Copper Days per year at Copper with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 19 in 1923. 051015201906: 131907: 151908: 161909: 141910: 121911: 101912: 81913: 91914: 111915: 161916: 121917: 101918: 101919: 81920: 141921: 91922: 91923: 191924: 71925: 131926: 141927: 161928: 81929: 91930: 61931: 51932: 91933: 121934: 71935: 121936: 171937: 131938: 121939: 111940: 131941: 171942: 151943: 151944: 171945: 81946: 151947: 131949: 91951: 111953: 4190619111916192119261931193619411946
Days per year at Copper with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 19 in 1923.
Days with 10 mm (0.39 in) or more of precipitation per year at Copper
YearDaysDecade average
19061314.5
19071514.5
19081614.5
19091414.5
19101210.6
19111010.6
1912810.6
1913910.6
19141110.6
19151610.6
19161210.6
19171010.6
19181010.6
1919810.6
19201411.8
1921911.8
1922911.8
19231911.8
1924711.8
19251311.8
19261411.8
19271611.8
1928811.8
1929911.8
1930610.4
1931510.4
1932910.4
19331210.4
1934710.4
19351210.4
19361710.4
19371310.4
19381210.4
19391110.4
19401313.6
19411713.6
19421513.6
19431513.6
19441713.6
1945813.6
19461513.6
19471313.6
1949913.6
1951117.5
195347.5
First to last qualifying date each year at Copper For each year, a bar from the first to the last day at Copper meeting 10 mm (0.39 in). 1906: 19 January 1906 to 20 December 19061907: 28 January 1907 to 10 August 19071908: 31 March 1908 to 16 October 19081909: 7 June 1909 to 16 December 19091910: 3 April 1910 to 4 December 19101911: 15 May 1911 to 22 September 19111912: 25 April 1912 to 4 October 19121913: 18 March 1913 to 2 November 19131914: 10 May 1914 to 13 November 19141915: 30 April 1915 to 27 September 19151916: 11 April 1916 to 11 December 19161917: 15 April 1917 to 29 December 19171918: 30 January 1918 to 17 October 19181919: 3 March 1919 to 11 December 19191920: 26 January 1920 to 18 September 19201921: 16 June 1921 to 15 December 19211922: 27 May 1922 to 6 December 19221923: 23 January 1923 to 29 December 19231924: 10 April 1924 to 22 November 19241925: 5 April 1925 to 23 December 19251926: 23 May 1926 to 25 November 19261927: 6 May 1927 to 21 November 19271928: 13 January 1928 to 28 August 19281929: 25 January 1929 to 23 December 19291930: 25 April 1930 to 15 October 19301931: 26 May 1931 to 29 September 19311932: 17 March 1932 to 8 November 19321933: 15 January 1933 to 25 December 19331934: 1 January 1934 to 28 September 19341935: 9 March 1935 to 16 October 19351936: 5 January 1936 to 29 December 19361937: 3 January 1937 to 22 December 19371938: 25 April 1938 to 16 October 19381939: 11 January 1939 to 7 November 19391940: 10 February 1940 to 29 November 19401941: 16 April 1941 to 20 November 19411942: 15 April 1942 to 29 November 19421943: 14 January 1943 to 19 October 19431944: 21 February 1944 to 20 December 19441945: 2 February 1945 to 21 September 19451946: 23 May 1946 to 29 November 19461947: 22 January 1947 to 9 November 19471949: 10 March 1949 to 24 August 19491951: 5 February 1951 to 17 September 19511953: 29 May 1953 to 7 June 195319061912191819241930193619421949JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Copper meeting 10 mm (0.39 in).
First to last qualifying date each year at Copper
YearFirst dateLast date
19061906-01-191906-12-20
19071907-01-281907-08-10
19081908-03-311908-10-16
19091909-06-071909-12-16
19101910-04-031910-12-04
19111911-05-151911-09-22
19121912-04-251912-10-04
19131913-03-181913-11-02
19141914-05-101914-11-13
19151915-04-301915-09-27
19161916-04-111916-12-11
19171917-04-151917-12-29
19181918-01-301918-10-17
19191919-03-031919-12-11
19201920-01-261920-09-18
19211921-06-161921-12-15
19221922-05-271922-12-06
19231923-01-231923-12-29
19241924-04-101924-11-22
19251925-04-051925-12-23
19261926-05-231926-11-25
19271927-05-061927-11-21
19281928-01-131928-08-28
19291929-01-251929-12-23
19301930-04-251930-10-15
19311931-05-261931-09-29
19321932-03-171932-11-08
19331933-01-151933-12-25
19341934-01-011934-09-28
19351935-03-091935-10-16
19361936-01-051936-12-29
19371937-01-031937-12-22
19381938-04-251938-10-16
19391939-01-111939-11-07
19401940-02-101940-11-29
19411941-04-161941-11-20
19421942-04-151942-11-29
19431943-01-141943-10-19
19441944-02-211944-12-20
19451945-02-021945-09-21
19461946-05-231946-11-29
19471947-01-221947-11-09
19491949-03-101949-08-24
19511951-02-051951-09-17
19531953-05-291953-06-07

Every Fixed Threshold

Fixed thresholds at Copper
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain451919234
25 mm (0.98 in): Days with 25 mm or more rain28619401
50 mm (1.97 in): Days with 50 mm or more rain1119071
10 cm (3.9 in): Days with 10 cm or more snowfall301219249
25 cm (9.8 in): Days with 25 cm or more snowfall7219361

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1906.

Download the Data

  • Data for Copper 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 2026-10-15 (15 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).