Big Sky 2WNW Weather Records (USC00240775)

Record envelope, standing records and threshold days for Big Sky 2WNW (USC00240775), Montana, United States, with 38 years of record.

Key Facts for Big Sky 2WNW

Big Sky 2WNW (USC00240775) is a weather station in Montana, United States at 45.28 latitude and -111.33 longitude, 2,009 m (6,590 ft) above sea level.
The station reports from 1984 to 2021, 38 years of record.
1,464 records set at Big Sky 2WNW 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, 45.28 latitude, -111.33 longitude.
Elevation: 2,009 m (6,590 ft).
Period of record: 1984 to 2021, 38 years.
Eligible elements: none yet.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Big Sky 2WNW. 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 Big Sky 2WNW, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	12.2 C (54.0 F)	-39.4 C (-38.9 F)	n/a	n/a
Feb	13.9 C (57.0 F)	-41.1 C (-42.0 F)	n/a	n/a
Mar	18.3 C (64.9 F)	-28.9 C (-20.0 F)	n/a	n/a
Apr	25.0 C (77.0 F)	-22.8 C (-9.0 F)	n/a	n/a
May	28.9 C (84.0 F)	-13.3 C (8.1 F)	n/a	n/a
Jun	32.8 C (91.0 F)	-7.2 C (19.0 F)	n/a	n/a
Jul	35.0 C (95.0 F)	-3.9 C (25.0 F)	n/a	n/a
Aug	33.9 C (93.0 F)	-6.7 C (19.9 F)	n/a	n/a
Sep	31.7 C (89.1 F)	-11.1 C (12.0 F)	n/a	n/a
Oct	27.2 C (81.0 F)	-22.8 C (-9.0 F)	n/a	n/a
Nov	17.8 C (64.0 F)	-30.0 C (-22.0 F)	n/a	n/a
Dec	11.7 C (53.1 F)	-40.0 C (-40.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Big Sky 2WNW still stand. 1988 holds the most, with 90.

Standing records at Big Sky 2WNW by the year they were set
Year set	Standing records
1984	49
1985	69
1986	54
1987	79
1988	90
1989	48
1990	64
1991	57
1992	41
1993	70
1996	38
1997	34
1998	41
1999	43
2000	33
2001	23
2002	44
2003	44
2004	32
2005	32
2006	40
2007	44
2008	38
2009	55
2010	45
2011	36
2012	36
2013	49
2014	67
2015	25
2016	11
2019	15
2020	12
2021	6

Wettest Day of Each Month

Jun: 49.8 mm (2.0 in)

The wettest day on record for each calendar month at Big Sky 2WNW. The most was 49.8 mm (2.0 in) on 13 June 2001.

Record daily precipitation for each month at Big Sky 2WNW
Month	Record daily precipitation (mm)	Date
Jan	17.8 mm (0.7 in)	14 January 2021
Feb	15.7 mm (0.6 in)	6 February 2020
Mar	26.2 mm (1.0 in)	29 March 2009
Apr	19.1 mm (0.8 in)	29 April 2010
May	45.2 mm (1.8 in)	9 May 1991
Jun	49.8 mm (2.0 in)	13 June 2001
Jul	31.8 mm (1.3 in)	10 July 1987
Aug	30.0 mm (1.2 in)	8 August 2008
Sep	39.4 mm (1.6 in)	21 September 1984
Oct	38.1 mm (1.5 in)	11 October 2001
Nov	39.4 mm (1.6 in)	11 November 1992
Dec	39.4 mm (1.6 in)	4 December 1996

Period of Record Coverage

1984 to 2021

34 years of record at Big Sky 2WNW, 1984 to 2021. 19 years have data for under 90 percent of days and are left out of rankings: 1984, 1985, 1989, 1990, 1992, 1993, 1996, 1997 and others.

Days with data per year at Big Sky 2WNW
Year	Days with data	Share of year	Complete
1984	288	79%	No
1985	304	83%	No
1986	330	90%	Yes
1987	335	92%	Yes
1988	336	92%	Yes
1989	243	67%	No
1990	327	90%	No
1991	335	92%	Yes
1992	269	73%	No
1993	307	84%	No
1996	193	53%	No
1997	283	78%	No
1998	300	82%	No
1999	295	81%	No
2000	327	89%	No
2001	342	94%	Yes
2002	332	91%	Yes
2003	305	84%	No
2004	284	78%	No
2005	326	89%	No
2006	354	97%	Yes
2007	360	99%	Yes
2008	360	98%	Yes
2009	360	99%	Yes
2010	362	99%	Yes
2011	363	99%	Yes
2012	365	100%	Yes
2013	362	99%	Yes
2014	365	100%	Yes
2015	90	25%	No
2016	90	25%	No
2019	150	41%	No
2020	163	45%	No
2021	54	15%	No

Latest Records

No records were set at this station in the latest data.

Climate Trend

18 complete years, 1986 to 2014

One stripe for each of 18 complete years at Big Sky 2WNW, 1986 to 2014. Blue stripes are years cooler than the station's own mean of 3.4 C (38.1 F); red stripes are warmer. The coolest year was 2008, at 2.4 C (36.2 F), and the warmest was 1988, at 4.5 C (40.0 F). The strongest colour marks a difference of 1.1 C (2.0 F).

Annual mean temperature at Big Sky 2WNW as warming stripes, 1986 to 2014
Year	Annual mean temperature	Difference from the station mean
1986	3.9 C	+0.45 C
1987	4.1 C	+0.67 C
1988	4.5 C	+1.07 C
1990	3.5 C	+0.10 C
1991	3.7 C	+0.33 C
1998	4.0 C	+0.56 C
2000	3.4 C	+0.02 C
2001	3.7 C	+0.33 C
2002	2.6 C	-0.78 C
2006	3.4 C	+0.04 C
2007	4.0 C	+0.55 C
2008	2.4 C	-1.05 C
2009	2.4 C	-0.97 C
2010	3.0 C	-0.42 C
2011	2.5 C	-0.89 C
2012	4.2 C	+0.83 C
2013	2.9 C	-0.52 C
2014	3.1 C	-0.31 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

1984 to 2021

Yearly extremes at Big Sky 2WNW: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	35.0 C (95.0 F)	2002	31.1 C (88.0 F)	34
Coldest night (TNn)	-41.1 C (-42.0 F)	1989	-32.2 C (-26.0 F)	34
Wettest day (Rx1day)	49.8 mm (2.0 in)	2001	22.7 mm (0.9 in)	34
Wettest five days (Rx5day)	90.4 mm (3.6 in)	1991	42.7 mm (1.7 in)	33
Longest dry spell (CDD)	37 days	2004	20 days	34

Hottest day (TXx)

The hottest day of the year at Big Sky 2WNW, 1984 to 2021. The record is 35.0 C (95.0 F) in 2002, marked on the chart; the median year is 31.1 C (88.0 F).

Hottest day (TXx) at Big Sky 2WNW by year
Year	Hottest day (TXx)
1984	29.4 C (84.9 F)
1985	32.8 C (91.0 F)
1986	32.2 C (90.0 F)
1987	30.0 C (86.0 F)
1988	33.9 C (93.0 F)
1989	27.2 C (81.0 F)
1990	33.9 C (93.0 F)
1991	31.1 C (88.0 F)
1992	30.0 C (86.0 F)
1993	27.8 C (82.0 F)
1996	31.7 C (89.1 F)
1997	30.6 C (87.1 F)
1998	32.8 C (91.0 F)
1999	32.2 C (90.0 F)
2000	32.2 C (90.0 F)
2001	32.8 C (91.0 F)
2002	35.0 C (95.0 F)
2003	33.3 C (91.9 F)
2004	30.6 C (87.1 F)
2005	31.1 C (88.0 F)
2006	32.2 C (90.0 F)
2007	33.9 C (93.0 F)
2008	30.6 C (87.1 F)
2009	31.1 C (88.0 F)
2010	28.9 C (84.0 F)
2011	30.0 C (86.0 F)
2012	31.1 C (88.0 F)
2013	31.1 C (88.0 F)
2014	29.4 C (84.9 F)
2015	18.3 C (64.9 F)
2016	30.0 C (86.0 F)
2019	29.4 C (84.9 F)
2020	31.7 C (89.1 F)
2021	16.7 C (62.1 F)

Coldest night (TNn)

The coldest night of the year at Big Sky 2WNW, 1984 to 2021. The record is -41.1 C (-42.0 F) in 1989, marked on the chart; the median year is -32.2 C (-26.0 F).

Coldest night (TNn) at Big Sky 2WNW by year
Year	Coldest night (TNn)
1984	-28.9 C (-20.0 F)
1985	-37.2 C (-35.0 F)
1986	-30.0 C (-22.0 F)
1987	-32.8 C (-27.0 F)
1988	-29.4 C (-20.9 F)
1989	-41.1 C (-42.0 F)
1990	-40.0 C (-40.0 F)
1991	-39.4 C (-38.9 F)
1992	-30.0 C (-22.0 F)
1993	-32.2 C (-26.0 F)
1996	-24.4 C (-11.9 F)
1997	-38.9 C (-38.0 F)
1998	-35.6 C (-32.1 F)
1999	-23.9 C (-11.0 F)
2000	-25.6 C (-14.1 F)
2001	-31.7 C (-25.1 F)
2002	-30.0 C (-22.0 F)
2003	-35.6 C (-32.1 F)
2004	-33.9 C (-29.0 F)
2005	-32.8 C (-27.0 F)
2006	-34.4 C (-29.9 F)
2007	-36.1 C (-33.0 F)
2008	-32.2 C (-26.0 F)
2009	-32.2 C (-26.0 F)
2010	-31.7 C (-25.1 F)
2011	-32.8 C (-27.0 F)
2012	-24.4 C (-11.9 F)
2013	-32.8 C (-27.0 F)
2014	-38.3 C (-36.9 F)
2015	-26.1 C (-15.0 F)
2016	-17.2 C (1.0 F)
2019	-25.0 C (-13.0 F)
2020	-25.6 C (-14.1 F)
2021	-27.2 C (-17.0 F)

Wettest day (Rx1day)

The wettest day of the year at Big Sky 2WNW, 1984 to 2021. The record is 49.8 mm (2.0 in) in 2001, marked on the chart; the median year is 22.7 mm (0.9 in).

Wettest day (Rx1day) at Big Sky 2WNW by year
Year	Wettest day (Rx1day)
1984	39.4 mm (1.6 in)
1985	17.8 mm (0.7 in)
1986	20.1 mm (0.8 in)
1987	31.8 mm (1.3 in)
1988	43.7 mm (1.7 in)
1989	22.9 mm (0.9 in)
1990	19.1 mm (0.8 in)
1991	45.2 mm (1.8 in)
1992	39.4 mm (1.6 in)
1993	17.8 mm (0.7 in)
1996	39.4 mm (1.6 in)
1997	23.1 mm (0.9 in)
1998	21.3 mm (0.8 in)
1999	24.1 mm (0.9 in)
2000	22.4 mm (0.9 in)
2001	49.8 mm (2.0 in)
2002	20.3 mm (0.8 in)
2003	16.5 mm (0.6 in)
2004	23.4 mm (0.9 in)
2005	29.0 mm (1.1 in)
2006	25.7 mm (1.0 in)
2007	22.9 mm (0.9 in)
2008	30.0 mm (1.2 in)
2009	26.2 mm (1.0 in)
2010	20.6 mm (0.8 in)
2011	20.3 mm (0.8 in)
2012	17.5 mm (0.7 in)
2013	15.2 mm (0.6 in)
2014	25.7 mm (1.0 in)
2015	11.4 mm (0.4 in)
2016	14.0 mm (0.6 in)
2019	16.0 mm (0.6 in)
2020	15.7 mm (0.6 in)
2021	17.8 mm (0.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at Big Sky 2WNW, 1984 to 2021. The record is 90.4 mm (3.6 in) in 1991, marked on the chart; the median year is 42.7 mm (1.7 in).

Wettest five days (Rx5day) at Big Sky 2WNW by year
Year	Wettest five days (Rx5day)
1984	47.1 mm (1.9 in)
1985	31.3 mm (1.2 in)
1986	40.2 mm (1.6 in)
1987	47.8 mm (1.9 in)
1988	45.0 mm (1.8 in)
1989	39.5 mm (1.6 in)
1990	42.7 mm (1.7 in)
1991	90.4 mm (3.6 in)
1992	62.2 mm (2.4 in)
1993	40.8 mm (1.6 in)
1996	31.2 mm (1.2 in)
1997	50.8 mm (2.0 in)
1998	32.8 mm (1.3 in)
1999	29.7 mm (1.2 in)
2000	44.0 mm (1.7 in)
2001	56.4 mm (2.2 in)
2002	38.9 mm (1.5 in)
2003	29.9 mm (1.2 in)
2004	59.7 mm (2.4 in)
2005	59.1 mm (2.3 in)
2006	47.7 mm (1.9 in)
2007	39.7 mm (1.6 in)
2008	54.3 mm (2.1 in)
2009	46.3 mm (1.8 in)
2010	49.3 mm (1.9 in)
2011	45.8 mm (1.8 in)
2012	31.5 mm (1.2 in)
2013	48.1 mm (1.9 in)
2014	37.8 mm (1.5 in)
2015	20.3 mm (0.8 in)
2016	29.6 mm (1.2 in)
2019	22.5 mm (0.9 in)
2020	8.2 mm (0.32 in)
2021	n/a

Longest dry spell (CDD)

The longest dry spell of the year at Big Sky 2WNW, 1984 to 2021. The record is 37 days in 2004, marked on the chart; the median year is 20 days.

Longest dry spell (CDD) at Big Sky 2WNW by year
Year	Longest dry spell (CDD)
1984	15 days
1985	19 days
1986	22 days
1987	34 days
1988	29 days
1989	19 days
1990	22 days
1991	24 days
1992	19 days
1993	36 days
1996	21 days
1997	15 days
1998	25 days
1999	15 days
2000	20 days
2001	24 days
2002	22 days
2003	20 days
2004	37 days
2005	14 days
2006	21 days
2007	36 days
2008	23 days
2009	19 days
2010	21 days
2011	17 days
2012	23 days
2013	15 days
2014	13 days
2015	13 days
2016	9 days
2019	6 days
2020	4 days
2021	4 days

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.

Download the Data

Data for Big Sky 2WNW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Big Sky 2WNW 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). Records are computed by this site and are not official.

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