Boyes Weather Records (USC00241040)

Record envelope, standing records and threshold days for Boyes (USC00241040), Montana, United States, with 68 years of record.

Key Facts for Boyes

Boyes (USC00241040) is a weather station in Montana, United States at 45.27 latitude and -105.02 longitude, 1,016 m (3,333 ft) above sea level.
The station reports from 1904 to 1971, 68 years of record.
1,464 records set at Boyes 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, 45.27 latitude, -105.02 longitude.
Elevation: 1,016 m (3,333 ft).
Period of record: 1904 to 1971, 68 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 Boyes. 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 Boyes, 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)	-42.8 C (-45.0 F)	n/a	n/a
Feb	20.0 C (68.0 F)	-41.7 C (-43.1 F)	n/a	n/a
Mar	25.6 C (78.1 F)	-34.4 C (-29.9 F)	n/a	n/a
Apr	30.6 C (87.1 F)	-17.2 C (1.0 F)	n/a	n/a
May	35.6 C (96.1 F)	-11.1 C (12.0 F)	n/a	n/a
Jun	40.0 C (104.0 F)	-3.3 C (26.1 F)	n/a	n/a
Jul	40.6 C (105.1 F)	1.7 C (35.1 F)	n/a	n/a
Aug	40.6 C (105.1 F)	-0.6 C (30.9 F)	n/a	n/a
Sep	40.0 C (104.0 F)	-10.6 C (12.9 F)	n/a	n/a
Oct	33.3 C (91.9 F)	-15.6 C (3.9 F)	n/a	n/a
Nov	23.9 C (75.0 F)	-34.4 C (-29.9 F)	n/a	n/a
Dec	19.4 C (66.9 F)	-37.2 C (-35.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Boyes still stand. 1953 holds the most, with 87.

Standing records at Boyes by the year they were set
Year set	Standing records
1950	61
1951	86
1952	67
1953	87
1954	87
1955	75
1956	62
1957	62
1958	77
1959	62
1960	66
1961	67
1962	66
1963	61
1964	62
1965	66
1966	61
1967	51
1968	82
1969	60
1970	45
1971	51

Wettest Day of Each Month

Aug: 101.6 mm (4.0 in)

The wettest day on record for each calendar month at Boyes. The most was 101.6 mm (4.0 in) on 1 August 1953.

Record daily precipitation for each month at Boyes
Month	Record daily precipitation (mm)	Date
Jan	6.4 mm (0.25 in)	30 January 1958
Feb	11.4 mm (0.4 in)	26 February 1954
Mar	15.2 mm (0.6 in)	12 March 1954
Apr	43.2 mm (1.7 in)	24 April 1950
May	50.8 mm (2.0 in)	22 May 1971
Jun	44.5 mm (1.8 in)	12 June 1970
Jul	33.5 mm (1.3 in)	12 July 1955
Aug	101.6 mm (4.0 in)	1 August 1953
Sep	34.8 mm (1.4 in)	3 September 1963
Oct	17.5 mm (0.7 in)	6 October 1962
Nov	40.6 mm (1.6 in)	13 November 1964
Dec	9.1 mm (0.36 in)	7 December 1951

Period of Record Coverage

1904 to 1971

23 years of record at Boyes, 1904 to 1971. 3 years have data for under 90 percent of days and are left out of rankings: 1904, 1950, 1971.

Days with data per year at Boyes
Year	Days with data	Share of year	Complete
1904	1	0%	No
1950	272	75%	No
1951	359	98%	Yes
1952	353	96%	Yes
1953	351	96%	Yes
1954	358	98%	Yes
1955	355	97%	Yes
1956	348	95%	Yes
1957	347	95%	Yes
1958	341	93%	Yes
1959	350	96%	Yes
1960	353	96%	Yes
1961	356	98%	Yes
1962	354	97%	Yes
1963	356	98%	Yes
1964	351	96%	Yes
1965	354	97%	Yes
1966	355	97%	Yes
1967	352	96%	Yes
1968	341	93%	Yes
1969	354	97%	Yes
1970	356	98%	Yes
1971	242	66%	No

Latest Records

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

Climate Trend

20 complete years, 1951 to 1970

One stripe for each of 20 complete years at Boyes, 1951 to 1970. Blue stripes are years cooler than the station's own mean of 6.6 C (44.0 F); red stripes are warmer. The coolest year was 1951, at 5.0 C (41.0 F), and the warmest was 1953, at 8.0 C (46.4 F). The strongest colour marks a difference of 1.7 C (3.1 F).

Annual mean temperature at Boyes as warming stripes, 1951 to 1970
Year	Annual mean temperature	Difference from the station mean
1951	5.0 C	-1.65 C
1952	7.1 C	+0.40 C
1953	8.0 C	+1.33 C
1954	7.4 C	+0.76 C
1955	6.0 C	-0.64 C
1956	6.7 C	+0.02 C
1957	6.4 C	-0.22 C
1958	7.1 C	+0.41 C
1959	6.0 C	-0.64 C
1960	6.8 C	+0.12 C
1961	7.8 C	+1.13 C
1962	6.9 C	+0.29 C
1963	7.4 C	+0.76 C
1964	6.5 C	-0.11 C
1965	5.9 C	-0.71 C
1966	6.7 C	+0.01 C
1967	6.8 C	+0.12 C
1968	5.9 C	-0.71 C
1969	6.2 C	-0.49 C
1970	6.4 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

1904 to 1971

Yearly extremes at Boyes: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.6 C (105.1 F)	1951	38.9 C (102.0 F)	23
Coldest night (TNn)	-42.8 C (-45.0 F)	1963	-35.6 C (-32.1 F)	23
Wettest day (Rx1day)	101.6 mm (4.0 in)	1953	31.8 mm (1.3 in)	23
Wettest five days (Rx5day)	120.1 mm (4.7 in)	1953	49.3 mm (1.9 in)	22
Longest dry spell (CDD)	73 days	1971	30 days	23

Hottest day (TXx)

The hottest day of the year at Boyes, 1904 to 1971. The record is 40.6 C (105.1 F) in 1951, marked on the chart; the median year is 38.9 C (102.0 F).

Hottest day (TXx) at Boyes by year
Year	Hottest day (TXx)
1904	11.1 C (52.0 F)
1950	37.2 C (99.0 F)
1951	40.6 C (105.1 F)
1952	39.4 C (102.9 F)
1953	37.2 C (99.0 F)
1954	40.6 C (105.1 F)
1955	37.8 C (100.0 F)
1956	37.8 C (100.0 F)
1957	37.8 C (100.0 F)
1958	40.6 C (105.1 F)
1959	38.9 C (102.0 F)
1960	40.6 C (105.1 F)
1961	40.0 C (104.0 F)
1962	36.7 C (98.1 F)
1963	37.2 C (99.0 F)
1964	39.4 C (102.9 F)
1965	40.0 C (104.0 F)
1966	40.6 C (105.1 F)
1967	36.7 C (98.1 F)
1968	36.7 C (98.1 F)
1969	36.7 C (98.1 F)
1970	39.4 C (102.9 F)
1971	40.0 C (104.0 F)

Coldest night (TNn)

The coldest night of the year at Boyes, 1904 to 1971. The record is -42.8 C (-45.0 F) in 1963, marked on the chart; the median year is -35.6 C (-32.1 F).

Coldest night (TNn) at Boyes by year
Year	Coldest night (TNn)
1904	-0.6 C (30.9 F)
1950	-31.1 C (-24.0 F)
1951	-36.7 C (-34.1 F)
1952	-34.4 C (-29.9 F)
1953	-29.4 C (-20.9 F)
1954	-40.0 C (-40.0 F)
1955	-32.8 C (-27.0 F)
1956	-33.9 C (-29.0 F)
1957	-38.9 C (-38.0 F)
1958	-31.1 C (-24.0 F)
1959	-34.4 C (-29.9 F)
1960	-35.6 C (-32.1 F)
1961	-30.0 C (-22.0 F)
1962	-36.7 C (-34.1 F)
1963	-42.8 C (-45.0 F)
1964	-37.2 C (-35.0 F)
1965	-33.3 C (-27.9 F)
1966	-34.4 C (-29.9 F)
1967	-37.2 C (-35.0 F)
1968	-35.6 C (-32.1 F)
1969	-37.2 C (-35.0 F)
1970	-37.2 C (-35.0 F)
1971	-41.7 C (-43.1 F)

Wettest day (Rx1day)

The wettest day of the year at Boyes, 1904 to 1971. The record is 101.6 mm (4.0 in) in 1953, marked on the chart; the median year is 31.8 mm (1.3 in).

Wettest day (Rx1day) at Boyes by year
Year	Wettest day (Rx1day)
1904	0.0 mm (0.00 in)
1950	43.2 mm (1.7 in)
1951	23.1 mm (0.9 in)
1952	28.2 mm (1.1 in)
1953	101.6 mm (4.0 in)
1954	21.8 mm (0.9 in)
1955	33.5 mm (1.3 in)
1956	26.2 mm (1.0 in)
1957	36.8 mm (1.4 in)
1958	26.7 mm (1.1 in)
1959	27.9 mm (1.1 in)
1960	27.2 mm (1.1 in)
1961	20.8 mm (0.8 in)
1962	31.8 mm (1.3 in)
1963	34.8 mm (1.4 in)
1964	40.6 mm (1.6 in)
1965	32.3 mm (1.3 in)
1966	24.1 mm (0.9 in)
1967	38.1 mm (1.5 in)
1968	40.6 mm (1.6 in)
1969	26.7 mm (1.1 in)
1970	45.7 mm (1.8 in)
1971	50.8 mm (2.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Boyes, 1904 to 1971. The record is 120.1 mm (4.7 in) in 1953, marked on the chart; the median year is 49.3 mm (1.9 in).

Wettest five days (Rx5day) at Boyes by year
Year	Wettest five days (Rx5day)
1904	n/a
1950	49.1 mm (1.9 in)
1951	43.2 mm (1.7 in)
1952	55.2 mm (2.2 in)
1953	120.1 mm (4.7 in)
1954	41.6 mm (1.6 in)
1955	49.1 mm (1.9 in)
1956	40.9 mm (1.6 in)
1957	65.3 mm (2.6 in)
1958	44.0 mm (1.7 in)
1959	46.7 mm (1.8 in)
1960	59.0 mm (2.3 in)
1961	36.0 mm (1.4 in)
1962	49.4 mm (1.9 in)
1963	50.8 mm (2.0 in)
1964	55.2 mm (2.2 in)
1965	44.0 mm (1.7 in)
1966	30.7 mm (1.2 in)
1967	76.1 mm (3.0 in)
1968	40.6 mm (1.6 in)
1969	62.0 mm (2.4 in)
1970	54.6 mm (2.1 in)
1971	65.6 mm (2.6 in)

Longest dry spell (CDD)

The longest dry spell of the year at Boyes, 1904 to 1971. The record is 73 days in 1971, marked on the chart; the median year is 30 days.

Longest dry spell (CDD) at Boyes by year
Year	Longest dry spell (CDD)
1904	1 day
1950	33 days
1951	29 days
1952	58 days
1953	28 days
1954	35 days
1955	28 days
1956	24 days
1957	32 days
1958	40 days
1959	27 days
1960	23 days
1961	33 days
1962	32 days
1963	28 days
1964	26 days
1965	49 days
1966	25 days
1967	56 days
1968	46 days
1969	30 days
1970	22 days
1971	73 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

20 years with a frost

Across 20 years with a frost, the median last spring frost at Boyes falls on 29 May and the median first autumn frost on 12 September, which leaves a median of 108 days between them.

Frost dates and growing season at Boyes
Measure	Median, all years	Earliest period	Recent period (1951 to 1970)	Recent against earliest	Fitted trend
Last spring frost	29 May	n/a	29 May	n/a	n/a
First autumn frost	12 September	n/a	12 September	n/a	n/a
Growing days	108 days	n/a	108 days	n/a	n/a

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 Boyes standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Boyes 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).