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Built 2026-10-15 (15 October 2026)

Copper Weather Records (USC00242012)

Record envelope, standing records and threshold days for Copper (USC00242012), Montana, United States, with 51 years of record.

Key Facts for Copper

  • Copper (USC00242012) is a weather station in Montana, United States at 46.60 latitude and -110.67 longitude, 1,732 m (5,682 ft) above sea level.
  • The station reports from 1905 to 1955, 51 years of record.
  • 0 records set at Copper still stand.
  • Records are tracked for prcp, snow: an element needs 30 years of data to be eligible.
  • Copper set a daily record precipitation of 8.1 mm (0.32 in) on 4 September 1954.

About the Station

  • Location: Montana, United States, 46.60 latitude, -110.67 longitude.
  • Elevation: 1,732 m (5,682 ft).
  • Period of record: 1905 to 1955, 51 years.
  • Eligible elements: prcp, snow.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Copper, with 2026 drawn through them The band shows the record high and record low for each calendar day at Copper. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 000111 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Copper. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Copper, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jann/an/an/an/a
Febn/an/an/an/a
Marn/an/an/an/a
Aprn/an/an/an/a
Mayn/an/an/an/a
Junn/an/an/an/a
Juln/an/an/an/a
Augn/an/an/an/a
Sepn/an/an/an/a
Octn/an/an/an/a
Novn/an/an/an/a
Decn/an/an/an/a

Which Years Hold Standing Records

0 standing records
Standing records at Copper by the year they were set 0 records at Copper still stand. 00000000000
0 records at Copper still stand.
Standing records at Copper by the year they were set
Year setStanding records

Wettest Day of Each Month

Jun: 51.3 mm (2.0 in)
Record daily precipitation for each month at Copper The wettest day on record for each calendar month at Copper. The most was 51.3 mm (2.0 in) on 23 June 1907. 0204060 Jan: 18.3 mm (0.7 in), 19 January 1906 Jan Feb: 24.1 mm (0.9 in), 11 February 1936 Feb Mar: 22.9 mm (0.9 in), 20 March 1907 Mar Apr: 38.1 mm (1.5 in), 22 April 1944 Apr May: 45.7 mm (1.8 in), 20 May 1912 May Jun: 51.3 mm (2.0 in), 23 June 1907 Jun Jul: 29.5 mm (1.2 in), 14 July 1918 Jul Aug: 33.0 mm (1.3 in), 20 August 1933 Aug Sep: 36.1 mm (1.4 in), 21 September 1940 Sep Oct: 35.6 mm (1.4 in), 16 October 1908 Oct Nov: 43.9 mm (1.7 in), 21 November 1940 Nov Dec: 25.4 mm (1.0 in), 10 December 1929 Dec
The wettest day on record for each calendar month at Copper. The most was 51.3 mm (2.0 in) on 23 June 1907.
Record daily precipitation for each month at Copper
MonthRecord daily precipitation (mm)Date
Jan18.3 mm (0.7 in)19 January 1906
Feb24.1 mm (0.9 in)11 February 1936
Mar22.9 mm (0.9 in)20 March 1907
Apr38.1 mm (1.5 in)22 April 1944
May45.7 mm (1.8 in)20 May 1912
Jun51.3 mm (2.0 in)23 June 1907
Jul29.5 mm (1.2 in)14 July 1918
Aug33.0 mm (1.3 in)20 August 1933
Sep36.1 mm (1.4 in)21 September 1940
Oct35.6 mm (1.4 in)16 October 1908
Nov43.9 mm (1.7 in)21 November 1940
Dec25.4 mm (1.0 in)10 December 1929

Latest Records

20
Latest records at Copper
DateStationRecordValueBeat old record byOld record stoodSignificance
4 September 1954Copper, USdaily rain8.1 mm (0.32 in)1.2 mm (0.05 in)16 years11 of 100 (Routine)
14 August 1954Copper, USdaily rain17.5 mm (0.7 in)4.3 mm (0.17 in)28 years20 of 100 (Routine)
5 August 1954Copper, USdaily rain18.8 mm (0.7 in)10.9 mm (0.4 in)12 years20 of 100 (Routine)
16 January 1954Copper, USdaily snowfall (Tie)7.6 cm (3.0 in)tie36 years3 of 100 (Routine)
29 May 1953Copper, USdaily rain31.0 mm (1.2 in)5.6 mm (0.22 in)11 years15 of 100 (Routine)
22 May 1953Copper, USdaily snowfall (Tie)7.6 cm (3.0 in)tie26 years2 of 100 (Routine)
16 November 1952Copper, USdaily rain (Tie)7.6 mm (0.30 in)tie17 years2 of 100 (Routine)
16 November 1952Copper, USdaily snowfall (Tie)10.2 cm (4.0 in)tie26 years2 of 100 (Routine)
1 November 1952Copper, USdaily rain10.2 mm (0.4 in)3.8 mm (0.15 in)4 years12 of 100 (Routine)
1 November 1952Copper, USdaily snowfall (Tie)10.2 cm (4.0 in)tie17 years2 of 100 (Routine)
31 December 1951Copper, USdaily rain (Tie)5.1 mm (0.20 in)tie40 years4 of 100 (Routine)
21 December 1951Copper, USdaily snowfall4.3 cm (1.7 in)1.8 cm (0.7 in)34 years19 of 100 (Routine)
21 December 1951Copper, USdaily rain3.6 mm (0.14 in)1.1 mm (0.04 in)17 years12 of 100 (Routine)
19 December 1951Copper, USdaily rain (Tie)5.1 mm (0.20 in)tie25 years2 of 100 (Routine)
27 June 1951Copper, USdaily snowfall1.3 cm (0.5 in)1.3 cm (0.5 in)45 years19 of 100 (Routine)
30 April 1951Copper, USdaily snowfall14.0 cm (5.5 in)6.4 cm (2.5 in)37 years29 of 100 (Routine)
19 March 1951Copper, USdaily snowfall10.2 cm (4.0 in)2.6 cm (1.0 in)25 years17 of 100 (Routine)
19 March 1951Copper, USdaily rain8.9 mm (0.35 in)2.0 mm (0.08 in)9 years11 of 100 (Routine)
18 March 1951Copper, USdaily rain (Tie)10.2 mm (0.4 in)tie37 years3 of 100 (Routine)
17 March 1951Copper, USdaily snowfall22.9 cm (9.0 in)14.3 cm (5.6 in)1 year41 of 100 (Notable)

Extremes by Year

1905 to 1955
Yearly extremes at Copper: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Wettest day (Rx1day)51.3 mm (2.0 in)190726.7 mm (1.1 in)51
Wettest five days (Rx5day)87.1 mm (3.4 in)192347.8 mm (1.9 in)50
Longest dry spell (CDD)55 days191730 days50

Wettest day (Rx1day)

Wettest day (Rx1day) at Copper by year The wettest day of the year at Copper, 1905 to 1955. The record is 51.3 mm (2.0 in) in 1907, marked on the chart; the median year is 26.7 mm (1.1 in). 020406019101920193019401950Record: 51.3 mm (2.0 in) in 1907
The wettest day of the year at Copper, 1905 to 1955. The record is 51.3 mm (2.0 in) in 1907, marked on the chart; the median year is 26.7 mm (1.1 in).
Wettest day (Rx1day) at Copper by year
YearWettest day (Rx1day)
190539.4 mm (1.6 in)
190620.3 mm (0.8 in)
190751.3 mm (2.0 in)
190835.6 mm (1.4 in)
190924.1 mm (0.9 in)
191035.6 mm (1.4 in)
191129.5 mm (1.2 in)
191245.7 mm (1.8 in)
191320.3 mm (0.8 in)
191427.9 mm (1.1 in)
191528.4 mm (1.1 in)
191633.0 mm (1.3 in)
191733.0 mm (1.3 in)
191829.5 mm (1.2 in)
191922.9 mm (0.9 in)
192025.4 mm (1.0 in)
192121.8 mm (0.9 in)
192219.1 mm (0.8 in)
192329.7 mm (1.2 in)
192414.0 mm (0.6 in)
192525.7 mm (1.0 in)
192626.7 mm (1.1 in)
192727.9 mm (1.1 in)
192822.9 mm (0.9 in)
192925.4 mm (1.0 in)
193017.8 mm (0.7 in)
193119.3 mm (0.8 in)
193222.9 mm (0.9 in)
193333.0 mm (1.3 in)
193443.2 mm (1.7 in)
193535.6 mm (1.4 in)
193633.0 mm (1.3 in)
193722.9 mm (0.9 in)
193845.2 mm (1.8 in)
193921.6 mm (0.9 in)
194043.9 mm (1.7 in)
194131.5 mm (1.2 in)
194228.2 mm (1.1 in)
194327.4 mm (1.1 in)
194444.5 mm (1.8 in)
194519.1 mm (0.8 in)
194624.6 mm (1.0 in)
194718.5 mm (0.7 in)
194819.1 mm (0.8 in)
194927.9 mm (1.1 in)
195013.5 mm (0.5 in)
195120.3 mm (0.8 in)
195210.2 mm (0.4 in)
195331.0 mm (1.2 in)
195418.8 mm (0.7 in)
19551.0 mm (0.04 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Copper by year The wettest five days of the year at Copper, 1905 to 1955. The record is 87.1 mm (3.4 in) in 1923, marked on the chart; the median year is 47.8 mm (1.9 in). 02040608010019101920193019401950Record: 87.1 mm (3.4 in) in 1923
The wettest five days of the year at Copper, 1905 to 1955. The record is 87.1 mm (3.4 in) in 1923, marked on the chart; the median year is 47.8 mm (1.9 in).
Wettest five days (Rx5day) at Copper by year
YearWettest five days (Rx5day)
190550.3 mm (2.0 in)
190647.8 mm (1.9 in)
190757.4 mm (2.3 in)
190884.6 mm (3.3 in)
190957.7 mm (2.3 in)
191044.5 mm (1.8 in)
191145.4 mm (1.8 in)
191264.2 mm (2.5 in)
191336.8 mm (1.4 in)
191459.0 mm (2.3 in)
191547.9 mm (1.9 in)
191639.7 mm (1.6 in)
191740.6 mm (1.6 in)
191851.8 mm (2.0 in)
191926.7 mm (1.1 in)
192045.5 mm (1.8 in)
192139.7 mm (1.6 in)
192238.6 mm (1.5 in)
192387.1 mm (3.4 in)
192422.9 mm (0.9 in)
192540.5 mm (1.6 in)
192639.5 mm (1.6 in)
192753.5 mm (2.1 in)
192841.5 mm (1.6 in)
192958.5 mm (2.3 in)
193032.6 mm (1.3 in)
193135.5 mm (1.4 in)
193234.6 mm (1.4 in)
193357.5 mm (2.3 in)
193458.5 mm (2.3 in)
193545.8 mm (1.8 in)
193655.9 mm (2.2 in)
193729.7 mm (1.2 in)
193860.4 mm (2.4 in)
193945.2 mm (1.8 in)
194054.1 mm (2.1 in)
194168.6 mm (2.7 in)
194250.8 mm (2.0 in)
194385.0 mm (3.3 in)
194486.9 mm (3.4 in)
194537.1 mm (1.5 in)
194641.9 mm (1.6 in)
194750.0 mm (2.0 in)
194857.0 mm (2.2 in)
194955.1 mm (2.2 in)
195027.7 mm (1.1 in)
195169.5 mm (2.7 in)
195210.7 mm (0.4 in)
195368.3 mm (2.7 in)
195427.0 mm (1.1 in)
1955n/a

Longest dry spell (CDD)

Longest dry spell (CDD) at Copper by year The longest dry spell of the year at Copper, 1905 to 1955. The record is 55 days in 1917, marked on the chart; the median year is 30 days. 10203040506019101920193019401950Record: 55 days in 1917
The longest dry spell of the year at Copper, 1905 to 1955. The record is 55 days in 1917, marked on the chart; the median year is 30 days.
Longest dry spell (CDD) at Copper by year
YearLongest dry spell (CDD)
190528 days
190622 days
190727 days
190838 days
190915 days
191019 days
191123 days
191246 days
191333 days
191423 days
191535 days
191623 days
191755 days
191838 days
191940 days
192025 days
192128 days
192233 days
192333 days
192419 days
192530 days
192626 days
192722 days
192829 days
192942 days
193047 days
193151 days
193236 days
193342 days
193443 days
193528 days
193626 days
193736 days
193827 days
193934 days
194033 days
194123 days
194222 days
194341 days
194433 days
194528 days
194619 days
194724 days
194831 days
194932 days
195023 days
195130 days
195222 days
195334 days
195421 days
1955n/a

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Rainfall Return Levels

45 years, 1906 to 1953

A day with at least 27.1 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 56.9 mm (2.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Copper: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years27.1 mm (1.1 in)
5 years34.9 mm (1.4 in)
10 years40.1 mm (1.6 in)
25 years46.8 mm (1.8 in)
50 years51.8 mm (2.0 in)Longer than the 45 years of record
100 years56.9 mm (2.2 in)Longer than the 45 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 45 years of values from 1906 to 1953.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 51.3 mm (2.0 in) in 1907; 45.7 mm (1.8 in) in 1912; 45.2 mm (1.8 in) in 1938.

Download the Data

  • Data for Copper standing records by year: CSV or JSON. Field meanings are on the data page.
  • 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

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