Box Canyon Weather Records (USS0010D31S)

Record envelope, standing records and threshold days for Box Canyon (USS0010D31S), Montana, United States, with 49 years of record.

Key Facts for Box Canyon

Box Canyon (USS0010D31S) is a weather station in Montana, United States at 45.27 latitude and -110.25 longitude, 2,033 m (6,670 ft) above sea level.
The station reports from 1978 to 2026, 49 years of record.
1,464 records set at Box Canyon still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Box Canyon set a daily record high maximum temperature of 23.7 C (74.7 F) on 8 October 2026 (provisional).

Provisional Records

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

About the Station

Location: Montana, United States, 45.27 latitude, -110.25 longitude.
Elevation: 2,033 m (6,670 ft).
Period of record: 1978 to 2026, 49 years.
Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

23 days at or beyond a record

The band shows the record high and record low for each calendar day at Box Canyon. 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 Box Canyon, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	13.7 C (56.7 F)	-34.5 C (-30.1 F)	10.1 C (50.2 F)	-20.1 C (-4.2 F)
Feb	15.3 C (59.5 F)	-33.9 C (-29.0 F)	15.3 C (59.5 F)	-15.5 C (4.1 F)
Mar	20.1 C (68.2 F)	-26.4 C (-15.5 F)	20.1 C (68.2 F)	-12.1 C (10.2 F)
Apr	31.0 C (87.8 F)	-19.9 C (-3.8 F)	20.6 C (69.1 F)	-7.1 C (19.2 F)
May	35.4 C (95.7 F)	-11.3 C (11.7 F)	28.6 C (83.5 F)	-6.1 C (21.0 F)
Jun	42.5 C (108.5 F)	-5.5 C (22.1 F)	27.4 C (81.3 F)	-0.1 C (31.8 F)
Jul	38.1 C (100.6 F)	-2.4 C (27.7 F)	35.7 C (96.3 F)	6.7 C (44.1 F)
Aug	41.3 C (106.3 F)	-3.1 C (26.4 F)	33.9 C (93.0 F)	3.5 C (38.3 F)
Sep	33.5 C (92.3 F)	-8.6 C (16.5 F)	26.4 C (79.5 F)	0.5 C (32.9 F)
Oct	31.2 C (88.2 F)	-22.7 C (-8.9 F)	25.7 C (78.3 F)	0.0 C (32.0 F)
Nov	18.8 C (65.8 F)	-27.4 C (-17.3 F)	n/a	n/a
Dec	12.3 C (54.1 F)	-36.3 C (-33.3 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Box Canyon still stand. 1996 holds the most, with 69.

Standing records at Box Canyon by the year they were set
Year set	Standing records
1989	36
1990	54
1991	46
1992	51
1993	49
1994	32
1995	41
1996	69
1997	40
1998	35
1999	28
2000	28
2001	25
2002	26
2003	48
2004	17
2005	45
2006	31
2007	23
2008	30
2009	44
2010	29
2011	23
2012	43
2013	36
2014	39
2015	42
2016	51
2017	41
2018	25
2019	28
2020	43
2021	53
2022	50
2023	30
2024	49
2025	42
2026	42

All-Time Record Progression

2 new records

2 all-time records were set at Box Canyon between 28 July 2021 and 30 May 2022. Each dot is a new record.

When Box Canyon set new all-time records
Date	Kind	Detail
2021-07-28	Record high minimum temperature	Record high minimum temperature 15.9 C (60.6 F)
2022-05-30	Record daily precipitation	Record daily precipitation 53.3 mm (2.1 in)

Wettest Day of Each Month

May: 53.3 mm (2.1 in)

The wettest day on record for each calendar month at Box Canyon. The most was 53.3 mm (2.1 in) on 30 May 2022.

Record daily precipitation for each month at Box Canyon
Month	Record daily precipitation (mm)	Date
Jan	30.5 mm (1.2 in)	9 January 1997
Feb	25.4 mm (1.0 in)	5 February 2011
Mar	17.8 mm (0.7 in)	30 March 1980
Apr	35.6 mm (1.4 in)	11 April 1991
May	53.3 mm (2.1 in)	30 May 2022
Jun	48.3 mm (1.9 in)	13 June 2001
Jul	33.0 mm (1.3 in)	9 July 1983
Aug	25.4 mm (1.0 in)	23 August 1987
Sep	30.5 mm (1.2 in)	18 September 1983
Oct	27.9 mm (1.1 in)	3 October 2013
Nov	27.9 mm (1.1 in)	7 November 1980
Dec	22.9 mm (0.9 in)	1 December 1995

Period of Record Coverage

1989 to 2026

38 years of record at Box Canyon, 1989 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 1989, 2026.

Days with data per year at Box Canyon
Year	Days with data	Share of year	Complete
1989	324	89%	No
1990	359	98%	Yes
1991	359	98%	Yes
1992	361	99%	Yes
1993	345	95%	Yes
1994	350	96%	Yes
1995	365	100%	Yes
1996	365	100%	Yes
1997	365	100%	Yes
1998	365	100%	Yes
1999	365	100%	Yes
2000	366	100%	Yes
2001	364	100%	Yes
2002	365	100%	Yes
2003	365	100%	Yes
2004	366	100%	Yes
2005	365	100%	Yes
2006	365	100%	Yes
2007	365	100%	Yes
2008	366	100%	Yes
2009	365	100%	Yes
2010	365	100%	Yes
2011	365	100%	Yes
2012	366	100%	Yes
2013	365	100%	Yes
2014	365	100%	Yes
2015	365	100%	Yes
2016	366	100%	Yes
2017	365	100%	Yes
2018	363	99%	Yes
2019	365	100%	Yes
2020	364	99%	Yes
2021	365	100%	Yes
2022	365	100%	Yes
2023	365	100%	Yes
2024	366	100%	Yes
2025	365	100%	Yes
2026	281	77%	No

Latest Records

Latest records at Box Canyon
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
8 October 2026	Box Canyon, US	daily high max (Provisional)	23.7 C (74.7 F)	1.5 C (2.7 F)	5 years	6 of 100 (Routine)
8 October 2026	Box Canyon, US	daily high min (Provisional)	6.7 C (44.1 F)	0.2 C (0.4 F)	11 years	6 of 100 (Routine)
7 October 2026	Box Canyon, US	daily high max (Provisional)	24.0 C (75.2 F)	1.0 C (1.8 F)	5 years	5 of 100 (Routine)
6 October 2026	Box Canyon, US	monthly high min (Provisional)	9.2 C (48.6 F)	0.2 C (0.4 F)	15 years	17 of 100 (Routine)
5 October 2026	Box Canyon, US	daily high max (Provisional)	25.7 C (78.3 F)	2.1 C (3.8 F)	4 years	7 of 100 (Routine)
5 October 2026	Box Canyon, US	daily high min (Provisional)	8.6 C (47.5 F)	1.1 C (2.0 F)	4 years	6 of 100 (Routine)
4 October 2026	Box Canyon, US	daily high max (Provisional)	24.6 C (76.3 F)	0.7 C (1.3 F)	1 year	4 of 100 (Routine)
30 August 2026	Box Canyon, US	daily rain (Tie, Provisional)	12.7 mm (0.5 in)	tie	12 years	1 of 100 (Routine)
26 August 2026	Box Canyon, US	daily high min (Provisional)	11.8 C (53.2 F)	0.2 C (0.4 F)	12 years	6 of 100 (Routine)
22 August 2026	Box Canyon, US	daily rain (Provisional)	10.2 mm (0.4 in)	5.1 mm (0.20 in)	32 years	20 of 100 (Routine)
9 August 2026	Box Canyon, US	daily high min	11.9 C (53.4 F)	0.2 C (0.4 F)	25 years	10 of 100 (Routine)
1 August 2026	Box Canyon, US	daily high max	33.9 C (93.0 F)	1.3 C (2.3 F)	25 years	12 of 100 (Routine)
1 August 2026	Box Canyon, US	daily high min	14.5 C (58.1 F)	0.5 C (0.9 F)	4 years	5 of 100 (Routine)
26 July 2026	Box Canyon, US	daily high min	14.7 C (58.5 F)	1.9 C (3.4 F)	4 years	10 of 100 (Routine)
25 July 2026	Box Canyon, US	daily high max	32.1 C (89.8 F)	0.4 C (0.7 F)	4 years	4 of 100 (Routine)
17 July 2026	Box Canyon, US	daily high min (Tie)	13.5 C (56.3 F)	tie	20 years	2 of 100 (Routine)
12 July 2026	Box Canyon, US	daily high min	14.4 C (57.9 F)	2.5 C (4.5 F)	24 years	19 of 100 (Routine)
12 July 2026	Box Canyon, US	daily high max	35.7 C (96.3 F)	0.8 C (1.4 F)	24 years	11 of 100 (Routine)
11 July 2026	Box Canyon, US	daily high max (Tie)	32.4 C (90.3 F)	tie	24 years	2 of 100 (Routine)
29 June 2026	Box Canyon, US	daily low max	8.6 C (47.5 F)	2.9 C (5.2 F)	8 years	9 of 100 (Routine)

Climate Trend

35 complete years, 1990 to 2025

One stripe for each of 35 complete years at Box Canyon, 1990 to 2025. Blue stripes are years cooler than the station's own mean of 5.0 C (40.9 F); red stripes are warmer. The coolest year was 1993, at 2.8 C (37.0 F), and the warmest was 2024, at 6.6 C (43.8 F). The strongest colour marks a difference of 2.2 C (4.0 F).

Annual mean temperature at Box Canyon as warming stripes, 1990 to 2025
Year	Annual mean temperature	Difference from the station mean
1990	3.6 C	-1.37 C
1991	4.0 C	-1.01 C
1992	4.5 C	-0.45 C
1993	2.8 C	-2.16 C
1994	4.2 C	-0.80 C
1995	3.6 C	-1.37 C
1996	3.2 C	-1.75 C
1997	3.4 C	-1.52 C
1998	4.7 C	-0.28 C
1999	5.5 C	+0.49 C
2000	5.3 C	+0.32 C
2001	5.9 C	+0.97 C
2002	4.1 C	-0.87 C
2003	5.4 C	+0.44 C
2004	4.8 C	-0.14 C
2006	5.5 C	+0.57 C
2007	5.7 C	+0.78 C
2008	4.3 C	-0.62 C
2009	4.4 C	-0.55 C
2010	5.1 C	+0.17 C
2011	4.7 C	-0.29 C
2012	6.3 C	+1.37 C
2013	5.3 C	+0.30 C
2014	5.0 C	+0.01 C
2015	6.4 C	+1.40 C
2016	6.3 C	+1.29 C
2017	5.8 C	+0.85 C
2018	5.2 C	+0.21 C
2019	4.1 C	-0.90 C
2020	5.5 C	+0.50 C
2021	5.8 C	+0.82 C
2022	5.0 C	+0.05 C
2023	5.5 C	+0.52 C
2024	6.6 C	+1.59 C
2025	6.5 C	+1.56 C

The annual mean temperature here has risen by 0.6 C (0.4 to 0.9) per decade over 1990 to 2025. In Fahrenheit: 1.1 F (0.7 to 1.6) per decade. The slope is a straight line fitted to 35 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Box Canyon
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.6 C (0.4 to 0.9) per decade	1.1 F (0.7 to 1.6) per decade	1990 to 2025	35	Rise
Mean daily maximum	0.5 C (0.2 to 0.7) per decade	0.9 F (0.4 to 1.3) per decade	1990 to 2025	35	Rise
Mean daily minimum	0.8 C (0.5 to 1.0) per decade	1.4 F (0.9 to 1.8) per decade	1990 to 2025	35	Rise

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

1978 to 2026

Yearly extremes at Box Canyon: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	42.5 C (108.5 F)	1990	32.3 C (90.2 F)	38
Coldest night (TNn)	-36.3 C (-33.3 F)	1990	-27.9 C (-18.2 F)	38
Wettest day (Rx1day)	53.3 mm (2.1 in)	2022	25.4 mm (1.0 in)	49
Wettest five days (Rx5day)	91.4 mm (3.6 in)	2022	48.3 mm (1.9 in)	49
Longest dry spell (CDD)	45 days	2010	19 days	49

Hottest day (TXx)

The hottest day of the year at Box Canyon, 1978 to 2026. The record is 42.5 C (108.5 F) in 1990, marked on the chart; the median year is 32.3 C (90.2 F).

Hottest day (TXx) at Box Canyon by year
Year	Hottest day (TXx)
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	33.4 C (92.1 F)
1990	42.5 C (108.5 F)
1991	39.1 C (102.4 F)
1992	41.3 C (106.3 F)
1993	31.7 C (89.1 F)
1994	30.8 C (87.4 F)
1995	30.7 C (87.3 F)
1996	32.4 C (90.3 F)
1997	31.2 C (88.2 F)
1998	34.7 C (94.5 F)
1999	31.3 C (88.3 F)
2000	34.0 C (93.2 F)
2001	31.9 C (89.4 F)
2002	34.9 C (94.8 F)
2003	33.5 C (92.3 F)
2004	30.1 C (86.2 F)
2005	33.3 C (91.9 F)
2006	33.0 C (91.4 F)
2007	34.5 C (94.1 F)
2008	31.7 C (89.1 F)
2009	31.6 C (88.9 F)
2010	30.9 C (87.6 F)
2011	31.5 C (88.7 F)
2012	32.8 C (91.0 F)
2013	31.3 C (88.3 F)
2014	30.1 C (86.2 F)
2015	31.7 C (89.1 F)
2016	30.8 C (87.4 F)
2017	32.4 C (90.3 F)
2018	34.3 C (93.7 F)
2019	30.5 C (86.9 F)
2020	32.1 C (89.8 F)
2021	34.4 C (93.9 F)
2022	33.5 C (92.3 F)
2023	32.3 C (90.1 F)
2024	33.4 C (92.1 F)
2025	31.7 C (89.1 F)
2026	35.7 C (96.3 F)

Coldest night (TNn)

The coldest night of the year at Box Canyon, 1978 to 2026. The record is -36.3 C (-33.3 F) in 1990, marked on the chart; the median year is -27.9 C (-18.2 F).

Coldest night (TNn) at Box Canyon by year
Year	Coldest night (TNn)
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	-27.0 C (-16.6 F)
1990	-36.3 C (-33.3 F)
1991	-27.8 C (-18.0 F)
1992	-26.4 C (-15.5 F)
1993	-29.1 C (-20.4 F)
1994	-28.3 C (-18.9 F)
1995	-25.9 C (-14.6 F)
1996	-29.7 C (-21.5 F)
1997	-34.5 C (-30.1 F)
1998	-30.7 C (-23.3 F)
1999	-18.7 C (-1.7 F)
2000	-24.0 C (-11.2 F)
2001	-23.9 C (-11.0 F)
2002	-26.0 C (-14.8 F)
2003	-27.7 C (-17.9 F)
2004	-28.0 C (-18.4 F)
2005	-24.7 C (-12.5 F)
2006	-30.9 C (-23.6 F)
2007	-30.6 C (-23.1 F)
2008	-30.6 C (-23.1 F)
2009	-29.9 C (-21.8 F)
2010	-24.0 C (-11.2 F)
2011	-30.0 C (-22.0 F)
2012	-17.9 C (-0.2 F)
2013	-29.3 C (-20.7 F)
2014	-33.9 C (-29.0 F)
2015	-23.0 C (-9.4 F)
2016	-28.3 C (-18.9 F)
2017	-25.4 C (-13.7 F)
2018	-26.7 C (-16.1 F)
2019	-26.4 C (-15.5 F)
2020	-21.0 C (-5.8 F)
2021	-29.8 C (-21.6 F)
2022	-34.9 C (-30.8 F)
2023	-30.6 C (-23.1 F)
2024	-32.8 C (-27.0 F)
2025	-27.5 C (-17.5 F)
2026	-20.1 C (-4.2 F)

Wettest day (Rx1day)

The wettest day of the year at Box Canyon, 1978 to 2026. The record is 53.3 mm (2.1 in) in 2022, marked on the chart; the median year is 25.4 mm (1.0 in).

Wettest day (Rx1day) at Box Canyon by year
Year	Wettest day (Rx1day)
1978	15.2 mm (0.6 in)
1979	40.6 mm (1.6 in)
1980	27.9 mm (1.1 in)
1981	20.3 mm (0.8 in)
1982	20.3 mm (0.8 in)
1983	33.0 mm (1.3 in)
1984	25.4 mm (1.0 in)
1985	17.8 mm (0.7 in)
1986	25.4 mm (1.0 in)
1987	30.5 mm (1.2 in)
1988	45.7 mm (1.8 in)
1989	30.5 mm (1.2 in)
1990	17.8 mm (0.7 in)
1991	35.6 mm (1.4 in)
1992	38.1 mm (1.5 in)
1993	22.9 mm (0.9 in)
1994	30.5 mm (1.2 in)
1995	22.9 mm (0.9 in)
1996	27.9 mm (1.1 in)
1997	30.5 mm (1.2 in)
1998	25.4 mm (1.0 in)
1999	20.3 mm (0.8 in)
2000	17.8 mm (0.7 in)
2001	48.3 mm (1.9 in)
2002	20.3 mm (0.8 in)
2003	25.4 mm (1.0 in)
2004	15.2 mm (0.6 in)
2005	12.7 mm (0.5 in)
2006	20.3 mm (0.8 in)
2007	30.5 mm (1.2 in)
2008	17.8 mm (0.7 in)
2009	25.4 mm (1.0 in)
2010	25.4 mm (1.0 in)
2011	30.5 mm (1.2 in)
2012	25.4 mm (1.0 in)
2013	27.9 mm (1.1 in)
2014	22.9 mm (0.9 in)
2015	22.9 mm (0.9 in)
2016	25.4 mm (1.0 in)
2017	27.9 mm (1.1 in)
2018	25.4 mm (1.0 in)
2019	20.3 mm (0.8 in)
2020	25.4 mm (1.0 in)
2021	25.4 mm (1.0 in)
2022	53.3 mm (2.1 in)
2023	25.4 mm (1.0 in)
2024	33.0 mm (1.3 in)
2025	20.3 mm (0.8 in)
2026	17.8 mm (0.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at Box Canyon, 1978 to 2026. The record is 91.4 mm (3.6 in) in 2022, marked on the chart; the median year is 48.3 mm (1.9 in).

Wettest five days (Rx5day) at Box Canyon by year
Year	Wettest five days (Rx5day)
1978	33.0 mm (1.3 in)
1979	53.3 mm (2.1 in)
1980	55.9 mm (2.2 in)
1981	38.1 mm (1.5 in)
1982	40.7 mm (1.6 in)
1983	45.7 mm (1.8 in)
1984	58.4 mm (2.3 in)
1985	50.8 mm (2.0 in)
1986	55.9 mm (2.2 in)
1987	45.8 mm (1.8 in)
1988	78.7 mm (3.1 in)
1989	43.1 mm (1.7 in)
1990	35.6 mm (1.4 in)
1991	76.2 mm (3.0 in)
1992	83.9 mm (3.3 in)
1993	43.3 mm (1.7 in)
1994	45.7 mm (1.8 in)
1995	55.9 mm (2.2 in)
1996	53.3 mm (2.1 in)
1997	55.9 mm (2.2 in)
1998	48.3 mm (1.9 in)
1999	40.7 mm (1.6 in)
2000	43.1 mm (1.7 in)
2001	73.6 mm (2.9 in)
2002	48.2 mm (1.9 in)
2003	33.0 mm (1.3 in)
2004	30.5 mm (1.2 in)
2005	43.2 mm (1.7 in)
2006	40.7 mm (1.6 in)
2007	53.3 mm (2.1 in)
2008	40.7 mm (1.6 in)
2009	38.0 mm (1.5 in)
2010	53.4 mm (2.1 in)
2011	53.3 mm (2.1 in)
2012	53.5 mm (2.1 in)
2013	55.9 mm (2.2 in)
2014	48.3 mm (1.9 in)
2015	45.6 mm (1.8 in)
2016	33.0 mm (1.3 in)
2017	63.4 mm (2.5 in)
2018	66.0 mm (2.6 in)
2019	56.0 mm (2.2 in)
2020	68.6 mm (2.7 in)
2021	43.2 mm (1.7 in)
2022	91.4 mm (3.6 in)
2023	50.8 mm (2.0 in)
2024	60.9 mm (2.4 in)
2025	45.8 mm (1.8 in)
2026	35.6 mm (1.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Box Canyon, 1978 to 2026. The record is 45 days in 2010, marked on the chart; the median year is 19 days.

Longest dry spell (CDD) at Box Canyon by year
Year	Longest dry spell (CDD)
1978	20 days
1979	27 days
1980	20 days
1981	32 days
1982	15 days
1983	16 days
1984	17 days
1985	13 days
1986	16 days
1987	22 days
1988	42 days
1989	19 days
1990	14 days
1991	18 days
1992	17 days
1993	16 days
1994	15 days
1995	12 days
1996	28 days
1997	9 days
1998	18 days
1999	37 days
2000	21 days
2001	30 days
2002	19 days
2003	26 days
2004	18 days
2005	20 days
2006	24 days
2007	36 days
2008	15 days
2009	10 days
2010	45 days
2011	29 days
2012	33 days
2013	21 days
2014	16 days
2015	18 days
2016	17 days
2017	30 days
2018	20 days
2019	40 days
2020	20 days
2021	27 days
2022	16 days
2023	22 days
2024	16 days
2025	14 days
2026	10 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.

Frost Dates and Growing Season

35 years with a frost

Across 35 years with a frost, the median last spring frost at Box Canyon falls on 7 June and the median first autumn frost on 19 September, which leaves a median of 108 days between them.

Fitted over all years, the growing season changes by +20.0 days per decade at this station.

Frost dates and growing season at Box Canyon
Measure	Median, all years	Earliest period	Recent period (1995 to 2025)	Recent against earliest	Fitted trend
Last spring frost	7 June	n/a	2 June	n/a	-7.4 days per decade
First autumn frost	19 September	n/a	21 September	n/a	+12.6 days per decade
Growing days	108 days	n/a	110 days	n/a	+20.0 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.

Rainfall Return Levels

47 years, 1979 to 2025

A day with at least 25.2 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 54.7 mm (2.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Box Canyon: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	25.2 mm (1.0 in)
5 years	32.3 mm (1.3 in)
10 years	37.3 mm (1.5 in)
25 years	44.0 mm (1.7 in)
50 years	49.2 mm (1.9 in)	Longer than the 47 years of record
100 years	54.7 mm (2.2 in)	Longer than the 47 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, 47 years of values from 1979 to 2025.

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: 53.3 mm (2.1 in) in 2022; 48.3 mm (1.9 in) in 2001; 45.7 mm (1.8 in) in 1988.

Download the Data

Data for Box Canyon standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Box Canyon 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 2026-10-13. Last revised 13 October 2026 (2026-10-13).