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Copper Basin Idaho Weather Records (USR0000ICOP)

Record envelope, standing records and threshold days for Copper Basin Idaho (USR0000ICOP), Idaho, United States, with 39 years of record.

Key Facts for Copper Basin Idaho

  • Copper Basin Idaho (USR0000ICOP) is a weather station in Idaho, United States at 43.80 latitude and -113.83 longitude, 2,384 m (7,820 ft) above sea level.
  • The station reports from 1985 to 2023, 39 years of record.
  • 1,464 records set at Copper Basin Idaho still stand.
  • Records are tracked for tmax, tmin: an element needs 30 years of data to be eligible.
  • Copper Basin Idaho tied a daily record high minimum temperature of 3.3 C (37.9 F) on 11 October 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

  • Location: Idaho, United States, 43.80 latitude, -113.83 longitude.
  • Elevation: 2,384 m (7,820 ft).
  • Period of record: 1985 to 2023, 39 years.
  • Eligible elements: tmax, tmin.

Daily Record Envelope and 2026

23 days at or beyond a record
Daily record high and record low at Copper Basin Idaho, with 2026 drawn through them The band shows the record high and record low for each calendar day at Copper Basin Idaho. The lines show the 2026 daily maximum and minimum. 23 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -60-40-2002040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Copper Basin Idaho. The lines show the 2026 daily maximum and minimum. 23 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Copper Basin Idaho, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan12.8 C (55.0 F)-41.0 C (-41.8 F)5.6 C (42.1 F)-29.4 C (-20.9 F)
Feb14.7 C (58.5 F)-38.9 C (-38.0 F)11.1 C (52.0 F)-32.2 C (-26.0 F)
Mar16.1 C (61.0 F)-32.8 C (-27.0 F)13.9 C (57.0 F)-21.7 C (-7.1 F)
Apr21.7 C (71.1 F)-30.0 C (-22.0 F)16.1 C (61.0 F)-17.2 C (1.0 F)
May27.2 C (81.0 F)-18.3 C (-0.9 F)22.8 C (73.0 F)-12.8 C (9.0 F)
Jun30.0 C (86.0 F)-13.6 C (7.5 F)26.7 C (80.1 F)-10.0 C (14.0 F)
Jul33.3 C (91.9 F)-12.3 C (9.9 F)30.0 C (86.0 F)-2.8 C (27.0 F)
Aug31.7 C (89.1 F)-17.8 C (0.0 F)30.0 C (86.0 F)-6.7 C (19.9 F)
Sep30.0 C (86.0 F)-21.8 C (-7.2 F)21.7 C (71.1 F)-9.4 C (15.1 F)
Oct26.1 C (79.0 F)-33.1 C (-27.6 F)23.9 C (75.0 F)-5.6 C (21.9 F)
Nov18.3 C (64.9 F)-36.7 C (-34.1 F)n/an/a
Dec13.3 C (55.9 F)-43.7 C (-46.7 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Copper Basin Idaho by the year they were set 1,464 records at Copper Basin Idaho still stand. 1987 holds the most, with 58. 02040601985: 521986: 311987: 581988: 411989: 441990: 291991: 341992: 401993: 351994: 351995: 291996: 441997: 361998: 311999: 362000: 272001: 342002: 352003: 472004: 242005: 332006: 422007: 302008: 432009: 402010: 382011: 292012: 422013: 362014: 312015: 372016: 272017: 232018: 162019: 212020: 382021: 312022: 322023: 422024: 282025: 362026: 27198519901995200020052010201520202025
1,464 records at Copper Basin Idaho still stand. 1987 holds the most, with 58.
Standing records at Copper Basin Idaho by the year they were set
Year setStanding records
198552
198631
198758
198841
198944
199029
199134
199240
199335
199435
199529
199644
199736
199831
199936
200027
200134
200235
200347
200424
200533
200642
200730
200843
200940
201038
201129
201242
201336
201431
201537
201627
201723
201816
201921
202038
202131
202232
202342
202428
202536
202627

Period of Record Coverage

1985 to 2026
Days with data per year at Copper Basin Idaho 42 years of record at Copper Basin Idaho, 1985 to 2026. 6 years have data for under 90 percent of days and are left out of rankings: 1985, 1986, 1993, 1996, 1997, 2026. 1985: 302 of 365 days1986: 310 of 365 days1987: 359 of 365 days1988: 363 of 366 days1989: 361 of 365 days1990: 365 of 365 days1991: 365 of 365 days1992: 364 of 366 days1993: 323 of 365 days1994: 360 of 365 days1995: 362 of 365 days1996: 44 of 366 days1997: 215 of 365 days1998: 350 of 365 days1999: 342 of 365 days2000: 365 of 366 days2001: 365 of 365 days2002: 364 of 365 days2003: 364 of 365 days2004: 365 of 366 days2005: 365 of 365 days2006: 365 of 365 days2007: 364 of 365 days2008: 365 of 366 days2009: 364 of 365 days2010: 364 of 365 days2011: 365 of 365 days2012: 366 of 366 days2013: 365 of 365 days2014: 365 of 365 days2015: 365 of 365 days2016: 363 of 366 days2017: 364 of 365 days2018: 365 of 365 days2019: 365 of 365 days2020: 366 of 366 days2021: 365 of 365 days2022: 365 of 365 days2023: 364 of 365 days2024: 366 of 366 days2025: 365 of 365 days2026: 283 of 365 days1990200020102020
42 years of record at Copper Basin Idaho, 1985 to 2026. 6 years have data for under 90 percent of days and are left out of rankings: 1985, 1986, 1993, 1996, 1997, 2026.
Days with data per year at Copper Basin Idaho
YearDays with dataShare of yearComplete
198530283%No
198631085%No
198735998%Yes
198836399%Yes
198936199%Yes
1990365100%Yes
1991365100%Yes
199236499%Yes
199332388%No
199436099%Yes
199536299%Yes
19964412%No
199721559%No
199835096%Yes
199934294%Yes
2000365100%Yes
2001365100%Yes
2002364100%Yes
2003364100%Yes
2004365100%Yes
2005365100%Yes
2006365100%Yes
2007364100%Yes
2008365100%Yes
2009364100%Yes
2010364100%Yes
2011365100%Yes
2012366100%Yes
2013365100%Yes
2014365100%Yes
2015365100%Yes
201636399%Yes
2017364100%Yes
2018365100%Yes
2019365100%Yes
2020366100%Yes
2021365100%Yes
2022365100%Yes
2023364100%Yes
2024366100%Yes
2025365100%Yes
202628378%No

Latest Records

20
Latest records at Copper Basin Idaho
DateStationRecordValueBeat old record byOld record stoodSignificance
11 October 2026Copper Basin Idaho, USdaily high min (Tie, Provisional)3.3 C (37.9 F)tie31 years3 of 100 (Routine)
8 October 2026Copper Basin Idaho, USdaily high max (Provisional)21.1 C (70.0 F)0.5 C (0.9 F)5 years5 of 100 (Routine)
7 October 2026Copper Basin Idaho, USdaily high max (Provisional)22.2 C (72.0 F)2.2 C (4.0 F)5 years8 of 100 (Routine)
6 October 2026Copper Basin Idaho, USdaily high max (Tie, Provisional)22.2 C (72.0 F)tie5 years1 of 100 (Routine)
5 October 2026Copper Basin Idaho, USdaily high max (Provisional)23.9 C (75.0 F)3.3 C (5.9 F)23 years15 of 100 (Routine)
4 October 2026Copper Basin Idaho, USdaily high max (Provisional)23.3 C (73.9 F)2.7 C (4.9 F)5 years9 of 100 (Routine)
19 September 2026Copper Basin Idaho, USdaily high min (Tie, Provisional)2.2 C (36.0 F)tie25 years2 of 100 (Routine)
13 September 2026Copper Basin Idaho, USdaily high min (Tie, Provisional)3.9 C (39.0 F)tie24 years2 of 100 (Routine)
11 September 2026Copper Basin Idaho, USdaily high min (Provisional)2.2 C (36.0 F)0.5 C (0.9 F)1 year5 of 100 (Routine)
8 September 2026Copper Basin Idaho, USdaily low min (Tie, Provisional)-9.4 C (15.1 F)tie16 years2 of 100 (Routine)
28 August 2026Copper Basin Idaho, USdaily high min (Provisional)10.0 C (50.0 F)2.2 C (4.0 F)12 years12 of 100 (Routine)
22 August 2026Copper Basin Idaho, USdaily high min (Tie, Provisional)7.8 C (46.0 F)tie3 years1 of 100 (Routine)
21 August 2026Copper Basin Idaho, USdaily high max (Tie, Provisional)30.0 C (86.0 F)tie16 years2 of 100 (Routine)
20 August 2026Copper Basin Idaho, USdaily high max (Tie, Provisional)29.4 C (84.9 F)tie23 years2 of 100 (Routine)
26 July 2026Copper Basin Idaho, USdaily high min8.9 C (48.0 F)1.7 C (3.1 F)19 years13 of 100 (Routine)
25 July 2026Copper Basin Idaho, USdaily high min12.8 C (55.0 F)0.6 C (1.1 F)23 years11 of 100 (Routine)
25 July 2026Copper Basin Idaho, USdaily high max (Tie)28.9 C (84.0 F)tie17 years2 of 100 (Routine)
24 July 2026Copper Basin Idaho, USdaily high max30.0 C (86.0 F)1.1 C (2.0 F)23 years12 of 100 (Routine)
21 July 2026Copper Basin Idaho, USdaily high min13.3 C (55.9 F)2.7 C (4.9 F)12 years14 of 100 (Routine)
17 July 2026Copper Basin Idaho, USdaily high min8.9 C (48.0 F)0.6 C (1.1 F)12 years8 of 100 (Routine)

Climate Trend

34 complete years, 1987 to 2025
Annual mean temperature at Copper Basin Idaho as warming stripes, 1987 to 2025 One stripe for each of 34 complete years at Copper Basin Idaho, 1987 to 2025. Blue stripes are years cooler than the station's own mean of 0.4 C (32.8 F); red stripes are warmer. The coolest year was 1989, at -0.9 C (30.4 F), and the warmest was 2025, at 1.7 C (35.0 F). The strongest colour marks a difference of 1.4 C (2.5 F). 1987: -0.2 C, -0.6 C from the station mean1988: -0.4 C, -0.8 C from the station mean1989: -0.9 C, -1.3 C from the station mean1990: -0.4 C, -0.9 C from the station mean1991: 0.0 C, -0.4 C from the station mean1992: 0.1 C, -0.3 C from the station mean1994: 0.3 C, -0.1 C from the station mean1995: -0.2 C, -0.6 C from the station mean2000: 0.9 C, +0.4 C from the station mean2001: 0.9 C, +0.5 C from the station mean2002: 0.1 C, -0.3 C from the station mean2003: 1.3 C, +0.9 C from the station mean2004: 0.9 C, +0.5 C from the station mean2005: 0.2 C, -0.2 C from the station mean2006: 0.6 C, +0.2 C from the station mean2007: 1.5 C, +1.1 C from the station mean2008: -0.3 C, -0.7 C from the station mean2009: -0.1 C, -0.5 C from the station mean2010: 0.1 C, -0.3 C from the station mean2011: -0.2 C, -0.6 C from the station mean2012: 1.0 C, +0.6 C from the station mean2013: 0.6 C, +0.2 C from the station mean2014: 1.2 C, +0.8 C from the station mean2015: 1.4 C, +1.0 C from the station mean2016: 0.8 C, +0.4 C from the station mean2017: 0.9 C, +0.5 C from the station mean2018: 0.4 C, 0.0 C from the station mean2019: -0.4 C, -0.8 C from the station mean2020: 0.4 C, 0.0 C from the station mean2021: 1.1 C, +0.7 C from the station mean2022: -0.1 C, -0.5 C from the station mean2023: 0.1 C, -0.3 C from the station mean2024: 1.1 C, +0.7 C from the station mean2025: 1.7 C, +1.2 C from the station mean198719901995200020052010201520202025
One stripe for each of 34 complete years at Copper Basin Idaho, 1987 to 2025. Blue stripes are years cooler than the station's own mean of 0.4 C (32.8 F); red stripes are warmer. The coolest year was 1989, at -0.9 C (30.4 F), and the warmest was 2025, at 1.7 C (35.0 F). The strongest colour marks a difference of 1.4 C (2.5 F).
Annual mean temperature at Copper Basin Idaho as warming stripes, 1987 to 2025
YearAnnual mean temperatureDifference from the station mean
1987-0.2 C-0.64 C
1988-0.4 C-0.85 C
1989-0.9 C-1.32 C
1990-0.4 C-0.86 C
19910.0 C-0.45 C
19920.1 C-0.33 C
19940.3 C-0.15 C
1995-0.2 C-0.58 C
20000.9 C+0.43 C
20010.9 C+0.46 C
20020.1 C-0.30 C
20031.3 C+0.85 C
20040.9 C+0.48 C
20050.2 C-0.20 C
20060.6 C+0.18 C
20071.5 C+1.11 C
2008-0.3 C-0.73 C
2009-0.1 C-0.54 C
20100.1 C-0.31 C
2011-0.2 C-0.60 C
20121.0 C+0.62 C
20130.6 C+0.20 C
20141.2 C+0.76 C
20151.4 C+0.96 C
20160.8 C+0.41 C
20170.9 C+0.50 C
20180.4 C+0.01 C
2019-0.4 C-0.84 C
20200.4 C-0.03 C
20211.1 C+0.65 C
2022-0.1 C-0.52 C
20230.1 C-0.28 C
20241.1 C+0.67 C
20251.7 C+1.23 C

The annual mean temperature here has risen by 0.3 C (0.1 to 0.5) per decade over 1987 to 2025. In Fahrenheit: 0.5 F (0.2 to 0.8) per decade. The slope is a straight line fitted to 34 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Copper Basin Idaho
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.3 C (0.1 to 0.5) per decade0.5 F (0.2 to 0.8) per decade1987 to 202534Rise
Mean daily maximum0.27 C (0.04 to 0.50) per decade0.5 F (0.1 to 0.9) per decade1987 to 202534Rise
Mean daily minimum0.3 C (0.1 to 0.5) per decade0.5 F (0.1 to 0.9) per decade1987 to 202534Rise

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1985 to 2026
Yearly extremes at Copper Basin Idaho: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)33.3 C (91.9 F)200229.8 C (85.6 F)42
Coldest night (TNn)-43.7 C (-46.7 F)1990-35.0 C (-31.1 F)42

Hottest day (TXx)

Hottest day (TXx) at Copper Basin Idaho by year The hottest day of the year at Copper Basin Idaho, 1985 to 2026. The record is 33.3 C (91.9 F) in 2002, marked on the chart; the median year is 29.8 C (85.6 F). 0102030401990200020102020Record: 33.3 C (91.9 F) in 2002
The hottest day of the year at Copper Basin Idaho, 1985 to 2026. The record is 33.3 C (91.9 F) in 2002, marked on the chart; the median year is 29.8 C (85.6 F).
Hottest day (TXx) at Copper Basin Idaho by year
YearHottest day (TXx)
198528.1 C (82.6 F)
198628.1 C (82.6 F)
198726.5 C (79.7 F)
198829.6 C (85.3 F)
198926.9 C (80.4 F)
199030.0 C (86.0 F)
199127.7 C (81.9 F)
199228.8 C (83.8 F)
199324.5 C (76.1 F)
199428.4 C (83.1 F)
199526.1 C (79.0 F)
19968.1 C (46.6 F)
199728.3 C (82.9 F)
199830.0 C (86.0 F)
199928.9 C (84.0 F)
200031.1 C (88.0 F)
200131.7 C (89.1 F)
200233.3 C (91.9 F)
200332.8 C (91.0 F)
200428.3 C (82.9 F)
200530.0 C (86.0 F)
200632.8 C (91.0 F)
200732.8 C (91.0 F)
200828.9 C (84.0 F)
200930.0 C (86.0 F)
201027.2 C (81.0 F)
201128.9 C (84.0 F)
201230.6 C (87.1 F)
201330.0 C (86.0 F)
201430.0 C (86.0 F)
201530.0 C (86.0 F)
201629.4 C (84.9 F)
201728.9 C (84.0 F)
201830.6 C (87.1 F)
201928.9 C (84.0 F)
202030.6 C (87.1 F)
202130.0 C (86.0 F)
202230.0 C (86.0 F)
202330.0 C (86.0 F)
202430.6 C (87.1 F)
202528.3 C (82.9 F)
202630.0 C (86.0 F)

Coldest night (TNn)

Coldest night (TNn) at Copper Basin Idaho by year The coldest night of the year at Copper Basin Idaho, 1985 to 2026. The record is -43.7 C (-46.7 F) in 1990, marked on the chart; the median year is -35.0 C (-31.1 F). -45-40-35-301990200020102020Record: -43.7 C (-46.7 F) in 1990
The coldest night of the year at Copper Basin Idaho, 1985 to 2026. The record is -43.7 C (-46.7 F) in 1990, marked on the chart; the median year is -35.0 C (-31.1 F).
Coldest night (TNn) at Copper Basin Idaho by year
YearColdest night (TNn)
1985-33.9 C (-29.0 F)
1986-32.7 C (-26.9 F)
1987-35.1 C (-31.2 F)
1988-38.6 C (-37.5 F)
1989-41.0 C (-41.8 F)
1990-43.7 C (-46.7 F)
1991-33.1 C (-27.6 F)
1992-36.3 C (-33.3 F)
1993-35.5 C (-31.9 F)
1994-33.6 C (-28.5 F)
1995-31.6 C (-24.9 F)
1996-33.6 C (-28.5 F)
1997-31.1 C (-24.0 F)
1998-35.0 C (-31.0 F)
1999-31.7 C (-25.1 F)
2000-31.1 C (-24.0 F)
2001-34.4 C (-29.9 F)
2002-36.1 C (-33.0 F)
2003-35.6 C (-32.1 F)
2004-33.3 C (-27.9 F)
2005-38.3 C (-36.9 F)
2006-35.6 C (-32.1 F)
2007-36.7 C (-34.1 F)
2008-35.0 C (-31.0 F)
2009-37.8 C (-36.0 F)
2010-36.7 C (-34.1 F)
2011-35.6 C (-32.1 F)
2012-35.0 C (-31.0 F)
2013-38.3 C (-36.9 F)
2014-36.1 C (-33.0 F)
2015-32.8 C (-27.0 F)
2016-35.6 C (-32.1 F)
2017-37.2 C (-35.0 F)
2018-32.8 C (-27.0 F)
2019-35.6 C (-32.1 F)
2020-32.8 C (-27.0 F)
2021-32.8 C (-27.0 F)
2022-35.0 C (-31.0 F)
2023-38.3 C (-36.9 F)
2024-32.8 C (-27.0 F)
2025-38.9 C (-38.0 F)
2026-32.2 C (-26.0 F)

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.

Frost Dates and Growing Season

34 years with a frost

Across 34 years with a frost, the median last spring frost at Copper Basin Idaho falls on 29 June and the median first autumn frost on 1 July, which leaves a median of 3 days between them.

Fitted over all years, the growing season changes by -0.1 days per decade at this station.

Frost dates and growing season at Copper Basin Idaho
MeasureMedian, all yearsEarliest periodRecent period (1991 to 2025)Recent against earliestFitted trend
Last spring frost29 Junen/a29 Junen/a+0.4 days per decade
First autumn frost1 Julyn/a1 Julyn/a+0.3 days per decade
Growing days3 daysn/a3 daysn/a-0.1 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Download the Data

  • Data for Copper Basin Idaho standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Copper Basin Idaho 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-14).