Bynum 4 SSE Weather Records (USC00241342)

Record envelope, standing records and threshold days for Bynum 4 SSE (USC00241342), Montana, United States, with 100 years of record.

Key Facts for Bynum 4 SSE

Bynum 4 SSE (USC00241342) is a weather station in Montana, United States at 47.93 latitude and -112.29 longitude, 1,231 m (4,039 ft) above sea level.
The station reports from 1927 to 2026, 100 years of record.
1,464 records set at Bynum 4 SSE still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Bynum 4 SSE set a daily record precipitation of 19.1 mm (0.8 in) on 12 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, 47.93 latitude, -112.29 longitude.
Elevation: 1,231 m (4,039 ft).
Period of record: 1927 to 2026, 100 years.
Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

60 days at or beyond a record

The band shows the record high and record low for each calendar day at Bynum 4 SSE. The lines show the 2026 daily maximum and minimum. 60 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Bynum 4 SSE, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	20.6 C (69.1 F)	-36.7 C (-34.1 F)	18.3 C (64.9 F)	-21.7 C (-7.1 F)
Feb	20.6 C (69.1 F)	-33.9 C (-29.0 F)	20.6 C (69.1 F)	-27.2 C (-17.0 F)
Mar	21.7 C (71.1 F)	-30.0 C (-22.0 F)	21.7 C (71.1 F)	-18.3 C (-0.9 F)
Apr	28.9 C (84.0 F)	-16.7 C (1.9 F)	26.1 C (79.0 F)	-8.9 C (16.0 F)
May	31.1 C (88.0 F)	-7.8 C (18.0 F)	30.0 C (86.0 F)	-2.8 C (27.0 F)
Jun	34.4 C (93.9 F)	0.6 C (33.1 F)	27.8 C (82.0 F)	3.3 C (37.9 F)
Jul	37.2 C (99.0 F)	2.2 C (36.0 F)	37.2 C (99.0 F)	7.2 C (45.0 F)
Aug	36.7 C (98.1 F)	3.3 C (37.9 F)	36.7 C (98.1 F)	6.7 C (44.1 F)
Sep	35.6 C (96.1 F)	-5.6 C (21.9 F)	28.3 C (82.9 F)	-1.7 C (28.9 F)
Oct	27.2 C (81.0 F)	-19.4 C (-2.9 F)	26.1 C (79.0 F)	-3.3 C (26.1 F)
Nov	22.2 C (72.0 F)	-24.4 C (-11.9 F)	n/a	n/a
Dec	18.3 C (64.9 F)	-32.8 C (-27.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Bynum 4 SSE still stand. 2021 holds the most, with 129.

All-Time Record Progression

3 new records

3 all-time records were set at Bynum 4 SSE between 9 February 2018 and 30 September 2019. Each dot is a new record.

When Bynum 4 SSE set new all-time records
Date	Kind	Detail
2018-02-09	Record daily snowfall	Record daily snowfall 43.2 cm (17.0 in)
2018-02-18	Record daily snowfall	Record daily snowfall 45.7 cm (18.0 in)
2019-09-30	Record snow depth	Record snow depth 66.0 cm (26.0 in)

Wettest Day of Each Month

Jun: 104.6 mm (4.1 in)

The wettest day on record for each calendar month at Bynum 4 SSE. The most was 104.6 mm (4.1 in) on 8 June 1964.

Record daily precipitation for each month at Bynum 4 SSE
Month	Record daily precipitation (mm)	Date
Jan	16.8 mm (0.7 in)	18 January 1975
Feb	26.7 mm (1.1 in)	28 February 1953
Mar	25.4 mm (1.0 in)	14 March 2026
Apr	53.3 mm (2.1 in)	10 April 2019
May	64.8 mm (2.6 in)	2 May 1964
Jun	104.6 mm (4.1 in)	8 June 1964
Jul	42.2 mm (1.7 in)	13 July 1970
Aug	40.6 mm (1.6 in)	2 August 1972
Sep	39.6 mm (1.6 in)	20 September 1968
Oct	27.4 mm (1.1 in)	13 October 1975
Nov	22.6 mm (0.9 in)	25 November 1961
Dec	18.0 mm (0.7 in)	2 December 1972

Period of Record Coverage

2011 to 2026

16 years of record at Bynum 4 SSE, 2011 to 2026. 3 years have data for under 90 percent of days and are left out of rankings: 2011, 2025, 2026.

Days with data per year at Bynum 4 SSE
Year	Days with data	Share of year	Complete
2011	113	31%	No
2012	364	99%	Yes
2013	364	100%	Yes
2014	352	96%	Yes
2015	354	97%	Yes
2016	362	99%	Yes
2017	354	97%	Yes
2018	358	98%	Yes
2019	357	98%	Yes
2020	357	98%	Yes
2021	362	99%	Yes
2022	340	93%	Yes
2023	361	99%	Yes
2024	359	98%	Yes
2025	249	68%	No
2026	283	78%	No

Latest Records

Latest records at Bynum 4 SSE
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
12 October 2026	Bynum 4 SSE, US	daily rain (Provisional)	19.1 mm (0.8 in)	9.2 mm (0.36 in)	51 years	20 of 100 (Routine)
12 October 2026	Bynum 4 SSE, US	daily snowfall (Provisional)	16.3 cm (6.4 in)	11.2 cm (4.4 in)	56 years	45 of 100 (Notable)
11 October 2026	Bynum 4 SSE, US	daily rain (Provisional)	27.2 mm (1.1 in)	19.3 mm (0.8 in)	51 years	65 of 100 (Major)
11 October 2026	Bynum 4 SSE, US	daily snowfall (Provisional)	12.2 cm (4.8 in)	3.6 cm (1.4 in)	9 years	18 of 100 (Routine)
8 September 2026	Bynum 4 SSE, US	daily rain (Provisional)	21.6 mm (0.9 in)	10.9 mm (0.4 in)	48 years	20 of 100 (Routine)
7 September 2026	Bynum 4 SSE, US	daily rain (Tie, Provisional)	5.6 mm (0.22 in)	tie	5 years	2 of 100 (Routine)
6 September 2026	Bynum 4 SSE, US	daily rain (Provisional)	22.4 mm (0.9 in)	14.0 mm (0.6 in)	11 years	20 of 100 (Routine)
29 June 2026	Bynum 4 SSE, US	daily rain	25.4 mm (1.0 in)	10.9 mm (0.4 in)	63 years	39 of 100 (Notable)
31 May 2026	Bynum 4 SSE, US	daily rain	25.4 mm (1.0 in)	8.9 mm (0.35 in)	55 years	37 of 100 (Notable)
15 March 2026	Bynum 4 SSE, US	daily snowfall	5.3 cm (2.1 in)	1.2 cm (0.5 in)	68 years	32 of 100 (Routine)
14 March 2026	Bynum 4 SSE, US	monthly rain	25.4 mm (1.0 in)	10.7 mm (0.4 in)	71 years	81 of 100 (Exceptional)
14 March 2026	Bynum 4 SSE, US	monthly snowfall	38.1 cm (15.0 in)	7.6 cm (3.0 in)	5 years	39 of 100 (Notable)
14 March 2026	Bynum 4 SSE, US	daily snow depth	27.9 cm (11.0 in)	2.5 cm (1.0 in)	5 years	14 of 100 (Routine)
9 March 2026	Bynum 4 SSE, US	daily rain	9.4 mm (0.37 in)	6.4 mm (0.25 in)	51 years	20 of 100 (Routine)
9 March 2026	Bynum 4 SSE, US	daily snowfall	14.7 cm (5.8 in)	4.0 cm (1.6 in)	64 years	38 of 100 (Notable)
14 October 2025	Bynum 4 SSE, US	daily snow depth	2.5 cm (1.0 in)	2.5 cm (1.0 in)	74 years	20 of 100 (Routine)
14 October 2025	Bynum 4 SSE, US	daily snowfall	3.8 cm (1.5 in)	2.5 cm (1.0 in)	8 years	15 of 100 (Routine)
5 October 2025	Bynum 4 SSE, US	daily rain	14.0 mm (0.6 in)	0.8 mm (0.03 in)	14 years	14 of 100 (Routine)
23 July 2025	Bynum 4 SSE, US	daily rain	2.5 mm (0.10 in)	2.0 mm (0.08 in)	3 years	12 of 100 (Routine)
16 July 2025	Bynum 4 SSE, US	daily rain	21.1 mm (0.8 in)	15.5 mm (0.6 in)	64 years	20 of 100 (Routine)

Climate Trend

12 complete years, 2012 to 2024

One stripe for each of 12 complete years at Bynum 4 SSE, 2012 to 2024. Blue stripes are years cooler than the station's own mean of 6.6 C (43.9 F); red stripes are warmer. The coolest year was 2019, at 4.3 C (39.7 F), and the warmest was 2015, at 7.9 C (46.2 F). The strongest colour marks a difference of 2.4 C (4.3 F).

Annual mean temperature at Bynum 4 SSE as warming stripes, 2012 to 2024
Year	Annual mean temperature	Difference from the station mean
2012	7.3 C	+0.68 C
2013	6.9 C	+0.30 C
2014	6.4 C	-0.19 C
2015	7.9 C	+1.29 C
2016	7.5 C	+0.94 C
2017	6.5 C	-0.12 C
2018	5.6 C	-0.99 C
2019	4.3 C	-2.32 C
2020	6.4 C	-0.20 C
2021	6.4 C	-0.15 C
2023	7.1 C	+0.55 C
2024	6.8 C	+0.24 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

1927 to 2026

Yearly extremes at Bynum 4 SSE: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	37.2 C (99.0 F)	2024	34.4 C (93.9 F)	16
Coldest night (TNn)	-36.7 C (-34.1 F)	2024	-31.1 C (-24.0 F)	16
Wettest day (Rx1day)	104.6 mm (4.1 in)	1964	28.5 mm (1.1 in)	46
Wettest five days (Rx5day)	139.4 mm (5.5 in)	1964	42.5 mm (1.7 in)	45
Longest dry spell (CDD)	92 days	1953	37 days	46

Hottest day (TXx)

The hottest day of the year at Bynum 4 SSE, 1927 to 2026. The record is 37.2 C (99.0 F) in 2024, marked on the chart; the median year is 34.4 C (93.9 F).

Hottest day (TXx) at Bynum 4 SSE by year
Year	Hottest day (TXx)
1927	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
2011	31.1 C (88.0 F)
2012	34.4 C (93.9 F)
2013	33.3 C (91.9 F)
2014	33.3 C (91.9 F)
2015	35.6 C (96.1 F)
2016	32.8 C (91.0 F)
2017	35.0 C (95.0 F)
2018	34.4 C (93.9 F)
2019	33.3 C (91.9 F)
2020	34.4 C (93.9 F)
2021	34.4 C (93.9 F)
2022	35.6 C (96.1 F)
2023	35.6 C (96.1 F)
2024	37.2 C (99.0 F)
2025	33.9 C (93.0 F)
2026	37.2 C (99.0 F)

Coldest night (TNn)

The coldest night of the year at Bynum 4 SSE, 1927 to 2026. The record is -36.7 C (-34.1 F) in 2024, marked on the chart; the median year is -31.1 C (-24.0 F).

Coldest night (TNn) at Bynum 4 SSE by year
Year	Coldest night (TNn)
1927	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
2011	-20.6 C (-5.1 F)
2012	-31.1 C (-24.0 F)
2013	-31.1 C (-24.0 F)
2014	-28.9 C (-20.0 F)
2015	-21.1 C (-6.0 F)
2016	-26.7 C (-16.1 F)
2017	-32.2 C (-26.0 F)
2018	-32.8 C (-27.0 F)
2019	-31.1 C (-24.0 F)
2020	-28.9 C (-20.0 F)
2021	-33.9 C (-29.0 F)
2022	-32.8 C (-27.0 F)
2023	-31.7 C (-25.1 F)
2024	-36.7 C (-34.1 F)
2025	-24.4 C (-11.9 F)
2026	-27.2 C (-17.0 F)

Wettest day (Rx1day)

The wettest day of the year at Bynum 4 SSE, 1927 to 2026. The record is 104.6 mm (4.1 in) in 1964, marked on the chart; the median year is 28.5 mm (1.1 in).

Wettest day (Rx1day) at Bynum 4 SSE by year
Year	Wettest day (Rx1day)
1927	0.0 mm (0.00 in)
1951	27.9 mm (1.1 in)
1952	24.1 mm (0.9 in)
1953	54.1 mm (2.1 in)
1954	21.8 mm (0.9 in)
1955	23.9 mm (0.9 in)
1956	37.1 mm (1.5 in)
1957	29.7 mm (1.2 in)
1958	31.5 mm (1.2 in)
1959	28.2 mm (1.1 in)
1960	19.8 mm (0.8 in)
1961	22.6 mm (0.9 in)
1962	20.8 mm (0.8 in)
1963	20.3 mm (0.8 in)
1964	104.6 mm (4.1 in)
1965	33.5 mm (1.3 in)
1966	18.3 mm (0.7 in)
1967	22.4 mm (0.9 in)
1968	39.6 mm (1.6 in)
1969	43.4 mm (1.7 in)
1970	42.2 mm (1.7 in)
1971	18.0 mm (0.7 in)
1972	40.6 mm (1.6 in)
1973	21.1 mm (0.8 in)
1974	29.2 mm (1.1 in)
1975	76.2 mm (3.0 in)
1976	47.8 mm (1.9 in)
1977	21.3 mm (0.8 in)
1978	27.9 mm (1.1 in)
1979	19.1 mm (0.8 in)
2011	13.2 mm (0.5 in)
2012	20.3 mm (0.8 in)
2013	14.5 mm (0.6 in)
2014	33.0 mm (1.3 in)
2015	29.7 mm (1.2 in)
2016	28.7 mm (1.1 in)
2017	39.9 mm (1.6 in)
2018	30.7 mm (1.2 in)
2019	53.3 mm (2.1 in)
2020	35.6 mm (1.4 in)
2021	27.9 mm (1.1 in)
2022	18.8 mm (0.7 in)
2023	30.5 mm (1.2 in)
2024	35.8 mm (1.4 in)
2025	29.5 mm (1.2 in)
2026	27.2 mm (1.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Bynum 4 SSE, 1927 to 2026. The record is 139.4 mm (5.5 in) in 1964, marked on the chart; the median year is 42.5 mm (1.7 in).

Wettest five days (Rx5day) at Bynum 4 SSE by year
Year	Wettest five days (Rx5day)
1927	n/a
1951	64.0 mm (2.5 in)
1952	29.0 mm (1.1 in)
1953	97.1 mm (3.8 in)
1954	27.7 mm (1.1 in)
1955	38.9 mm (1.5 in)
1956	42.5 mm (1.7 in)
1957	42.1 mm (1.7 in)
1958	72.3 mm (2.8 in)
1959	33.5 mm (1.3 in)
1960	37.6 mm (1.5 in)
1961	39.7 mm (1.6 in)
1962	34.3 mm (1.4 in)
1963	31.7 mm (1.2 in)
1964	139.4 mm (5.5 in)
1965	50.1 mm (2.0 in)
1966	35.8 mm (1.4 in)
1967	47.3 mm (1.9 in)
1968	49.2 mm (1.9 in)
1969	117.6 mm (4.6 in)
1970	70.3 mm (2.8 in)
1971	35.0 mm (1.4 in)
1972	47.1 mm (1.9 in)
1973	24.9 mm (1.0 in)
1974	48.0 mm (1.9 in)
1975	101.7 mm (4.0 in)
1976	79.6 mm (3.1 in)
1977	31.2 mm (1.2 in)
1978	41.8 mm (1.6 in)
1979	29.7 mm (1.2 in)
2011	2.5 mm (0.10 in)
2012	17.3 mm (0.7 in)
2013	28.7 mm (1.1 in)
2014	86.1 mm (3.4 in)
2015	46.2 mm (1.8 in)
2016	35.5 mm (1.4 in)
2017	53.6 mm (2.1 in)
2018	52.6 mm (2.1 in)
2019	75.4 mm (3.0 in)
2020	42.9 mm (1.7 in)
2021	63.2 mm (2.5 in)
2022	33.5 mm (1.3 in)
2023	41.7 mm (1.6 in)
2024	49.3 mm (1.9 in)
2025	29.5 mm (1.2 in)
2026	70.6 mm (2.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Bynum 4 SSE, 1927 to 2026. The record is 92 days in 1953, marked on the chart; the median year is 37 days.

Longest dry spell (CDD) at Bynum 4 SSE by year
Year	Longest dry spell (CDD)
1927	1 day
1951	22 days
1952	37 days
1953	92 days
1954	68 days
1955	45 days
1956	39 days
1957	59 days
1958	26 days
1959	52 days
1960	45 days
1961	41 days
1962	36 days
1963	58 days
1964	66 days
1965	48 days
1966	36 days
1967	55 days
1968	44 days
1969	57 days
1970	38 days
1971	31 days
1972	28 days
1973	36 days
1974	37 days
1975	35 days
1976	32 days
1977	35 days
1978	33 days
1979	40 days
2011	10 days
2012	11 days
2013	12 days
2014	16 days
2015	29 days
2016	62 days
2017	26 days
2018	26 days
2019	22 days
2020	34 days
2021	42 days
2022	20 days
2023	45 days
2024	34 days
2025	38 days
2026	44 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.

Rainfall Return Levels

36 years, 1952 to 2024

A day with at least 28.9 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 107.6 mm (4.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Bynum 4 SSE: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	28.9 mm (1.1 in)
5 years	41.4 mm (1.6 in)
10 years	52.3 mm (2.1 in)
25 years	70.1 mm (2.8 in)
50 years	87.0 mm (3.4 in)	Longer than the 36 years of record
100 years	107.6 mm (4.2 in)	Longer than the 36 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, 36 years of values from 1952 to 2024.

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: 104.6 mm (4.1 in) in 1964; 76.2 mm (3.0 in) in 1975; 54.1 mm (2.1 in) in 1953.

Download the Data

Data for Bynum 4 SSE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Bynum 4 SSE 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-16. Last revised 16 October 2026 (2026-10-16).