Zortman Mine Montana Weather Records (USR0000MZOR)
Record envelope, standing records and threshold days for Zortman Mine Montana (USR0000MZOR), Montana, United States, with 30 years of record.
Key Facts for Zortman Mine Montana
- Zortman Mine Montana (USR0000MZOR) is a weather station in Montana, United States at 47.92 latitude and -108.55 longitude, 1,420 m (4,660 ft) above sea level.
- The station reports from 1987 to 2016, 30 years of record.
- 1,464 records set at Zortman Mine Montana still stand.
- Records are tracked for no element yet: an element needs 30 years of data to be eligible.
About the Station
- Location: Montana, United States, 47.92 latitude, -108.55 longitude.
- Elevation: 1,420 m (4,660 ft).
- Period of record: 1987 to 2016, 30 years.
- Eligible elements: none yet.
Daily Record Envelope and 2026
0 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 18.3 C (64.9 F) | -32.8 C (-27.0 F) | n/a | n/a |
| Feb | 17.8 C (64.0 F) | -36.1 C (-33.0 F) | n/a | n/a |
| Mar | 21.1 C (70.0 F) | -30.6 C (-23.1 F) | n/a | n/a |
| Apr | 26.1 C (79.0 F) | -20.0 C (-4.0 F) | n/a | n/a |
| May | 28.9 C (84.0 F) | -7.8 C (18.0 F) | n/a | n/a |
| Jun | 33.3 C (91.9 F) | -2.8 C (27.0 F) | n/a | n/a |
| Jul | 37.2 C (99.0 F) | 1.7 C (35.1 F) | n/a | n/a |
| Aug | 35.6 C (96.1 F) | -0.6 C (30.9 F) | n/a | n/a |
| Sep | 32.8 C (91.0 F) | -7.8 C (18.0 F) | n/a | n/a |
| Oct | 30.0 C (86.0 F) | -18.3 C (-0.9 F) | n/a | n/a |
| Nov | 24.4 C (75.9 F) | -26.1 C (-15.0 F) | n/a | n/a |
| Dec | 15.0 C (59.0 F) | -33.9 C (-29.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1987 | 49 |
| 1988 | 56 |
| 1989 | 54 |
| 1990 | 58 |
| 1991 | 48 |
| 1992 | 87 |
| 1993 | 59 |
| 1994 | 50 |
| 1995 | 42 |
| 1996 | 86 |
| 1997 | 49 |
| 1998 | 40 |
| 1999 | 54 |
| 2000 | 44 |
| 2001 | 37 |
| 2002 | 64 |
| 2003 | 82 |
| 2004 | 35 |
| 2005 | 60 |
| 2006 | 49 |
| 2007 | 32 |
| 2008 | 41 |
| 2009 | 54 |
| 2010 | 37 |
| 2011 | 25 |
| 2012 | 42 |
| 2013 | 25 |
| 2014 | 47 |
| 2015 | 41 |
| 2016 | 17 |
Period of Record Coverage
1987 to 2016| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1987 | 248 | 68% | No |
| 1988 | 360 | 98% | Yes |
| 1989 | 355 | 97% | Yes |
| 1990 | 361 | 99% | Yes |
| 1991 | 351 | 96% | Yes |
| 1992 | 356 | 97% | Yes |
| 1993 | 344 | 94% | Yes |
| 1994 | 350 | 96% | Yes |
| 1995 | 357 | 98% | Yes |
| 1996 | 360 | 98% | Yes |
| 1997 | 358 | 98% | Yes |
| 1998 | 363 | 99% | Yes |
| 1999 | 362 | 99% | Yes |
| 2000 | 363 | 99% | Yes |
| 2001 | 360 | 99% | Yes |
| 2002 | 362 | 99% | Yes |
| 2003 | 358 | 98% | Yes |
| 2004 | 360 | 98% | Yes |
| 2005 | 361 | 99% | Yes |
| 2006 | 362 | 99% | Yes |
| 2007 | 363 | 99% | Yes |
| 2008 | 361 | 99% | Yes |
| 2009 | 361 | 99% | Yes |
| 2010 | 364 | 100% | Yes |
| 2011 | 364 | 100% | Yes |
| 2012 | 360 | 98% | Yes |
| 2013 | 363 | 99% | Yes |
| 2014 | 360 | 99% | Yes |
| 2015 | 363 | 99% | Yes |
| 2016 | 134 | 37% | No |
Latest Records
0No records were set at this station in the latest data.
Climate Trend
28 complete years, 1988 to 2015| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1988 | 7.3 C | +0.72 C |
| 1989 | 4.8 C | -1.77 C |
| 1990 | 6.0 C | -0.53 C |
| 1991 | 6.6 C | 0.00 C |
| 1992 | 6.6 C | +0.02 C |
| 1993 | 5.0 C | -1.54 C |
| 1994 | 6.5 C | -0.10 C |
| 1995 | 6.1 C | -0.45 C |
| 1996 | 4.1 C | -2.48 C |
| 1997 | 6.6 C | +0.02 C |
| 1998 | 7.6 C | +1.05 C |
| 1999 | 7.4 C | +0.80 C |
| 2000 | 6.7 C | +0.12 C |
| 2001 | 7.7 C | +1.10 C |
| 2002 | 5.7 C | -0.87 C |
| 2003 | 7.5 C | +0.88 C |
| 2004 | 6.9 C | +0.33 C |
| 2005 | 7.3 C | +0.71 C |
| 2006 | 7.8 C | +1.23 C |
| 2007 | 7.3 C | +0.71 C |
| 2008 | 6.1 C | -0.43 C |
| 2009 | 6.0 C | -0.59 C |
| 2010 | 6.7 C | +0.10 C |
| 2011 | 6.1 C | -0.46 C |
| 2012 | 7.7 C | +1.15 C |
| 2013 | 6.3 C | -0.25 C |
| 2014 | 5.9 C | -0.66 C |
| 2015 | 7.8 C | +1.27 C |
This station does not have enough complete years (30 are needed) to fit a temperature trend.
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
1987 to 2016| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 37.2 C (99.0 F) | 2007 | 33.9 C (93.0 F) | 30 |
| Coldest night (TNn) | -36.1 C (-33.0 F) | 1989 | -28.3 C (-18.9 F) | 30 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1987 | 31.1 C (88.0 F) |
| 1988 | 33.3 C (91.9 F) |
| 1989 | 31.7 C (89.1 F) |
| 1990 | 33.9 C (93.0 F) |
| 1991 | 32.8 C (91.0 F) |
| 1992 | 31.1 C (88.0 F) |
| 1993 | 28.3 C (82.9 F) |
| 1994 | 32.2 C (90.0 F) |
| 1995 | 33.3 C (91.9 F) |
| 1996 | 35.0 C (95.0 F) |
| 1997 | 32.2 C (90.0 F) |
| 1998 | 35.0 C (95.0 F) |
| 1999 | 33.9 C (93.0 F) |
| 2000 | 36.1 C (97.0 F) |
| 2001 | 35.6 C (96.1 F) |
| 2002 | 35.0 C (95.0 F) |
| 2003 | 36.1 C (97.0 F) |
| 2004 | 35.0 C (95.0 F) |
| 2005 | 33.9 C (93.0 F) |
| 2006 | 35.0 C (95.0 F) |
| 2007 | 37.2 C (99.0 F) |
| 2008 | 35.6 C (96.1 F) |
| 2009 | 32.2 C (90.0 F) |
| 2010 | 34.4 C (93.9 F) |
| 2011 | 33.9 C (93.0 F) |
| 2012 | 33.9 C (93.0 F) |
| 2013 | 31.7 C (89.1 F) |
| 2014 | 30.6 C (87.1 F) |
| 2015 | 34.4 C (93.9 F) |
| 2016 | 27.2 C (81.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1987 | -21.1 C (-6.0 F) |
| 1988 | -25.0 C (-13.0 F) |
| 1989 | -36.1 C (-33.0 F) |
| 1990 | -33.9 C (-29.0 F) |
| 1991 | -26.1 C (-15.0 F) |
| 1992 | -33.3 C (-27.9 F) |
| 1993 | -26.1 C (-15.0 F) |
| 1994 | -31.1 C (-24.0 F) |
| 1995 | -29.4 C (-20.9 F) |
| 1996 | -34.4 C (-29.9 F) |
| 1997 | -31.7 C (-25.1 F) |
| 1998 | -29.4 C (-20.9 F) |
| 1999 | -22.8 C (-9.0 F) |
| 2000 | -26.7 C (-16.1 F) |
| 2001 | -21.7 C (-7.1 F) |
| 2002 | -23.3 C (-9.9 F) |
| 2003 | -28.9 C (-20.0 F) |
| 2004 | -31.7 C (-25.1 F) |
| 2005 | -27.2 C (-17.0 F) |
| 2006 | -32.2 C (-26.0 F) |
| 2007 | -25.0 C (-13.0 F) |
| 2008 | -31.7 C (-25.1 F) |
| 2009 | -28.3 C (-18.9 F) |
| 2010 | -25.0 C (-13.0 F) |
| 2011 | -27.8 C (-18.0 F) |
| 2012 | -28.3 C (-18.9 F) |
| 2013 | -30.0 C (-22.0 F) |
| 2014 | -31.1 C (-24.0 F) |
| 2015 | -23.9 C (-11.0 F) |
| 2016 | -18.9 C (-2.0 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
28 years with a frostAcross 28 years with a frost, the median last spring frost at Zortman Mine Montana falls on 19 May and the median first autumn frost on 23 September, which leaves a median of 129 days between them.
Fitted over all years, the growing season changes by -0.6 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1988 to 2015) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 19 May | n/a | 19 May | n/a | +4.9 days per decade |
| First autumn frost | 23 September | n/a | 23 September | n/a | +4.3 days per decade |
| Growing days | 129 days | n/a | 129 days | n/a | -0.6 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
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).