Berthoud Pass Weather Records (USC00050674)

Record envelope, standing records and threshold days for Berthoud Pass (USC00050674), Colorado, United States, with 36 years of record.

Key Facts for Berthoud Pass

Berthoud Pass (USC00050674) is a weather station in Colorado, United States at 39.80 latitude and -105.78 longitude, 3,448 m (11,313 ft) above sea level.
The station reports from 1950 to 1985, 36 years of record.
1,464 records set at Berthoud Pass still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Colorado, United States, 39.80 latitude, -105.78 longitude.
Elevation: 3,448 m (11,313 ft).
Period of record: 1950 to 1985, 36 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 Berthoud Pass. 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 Berthoud Pass, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	5.6 C (42.1 F)	-36.1 C (-33.0 F)	n/a	n/a
Feb	8.3 C (46.9 F)	-36.7 C (-34.1 F)	n/a	n/a
Mar	10.0 C (50.0 F)	-31.1 C (-24.0 F)	n/a	n/a
Apr	13.9 C (57.0 F)	-24.4 C (-11.9 F)	n/a	n/a
May	16.7 C (62.1 F)	-19.4 C (-2.9 F)	n/a	n/a
Jun	21.1 C (70.0 F)	-11.7 C (10.9 F)	n/a	n/a
Jul	24.4 C (75.9 F)	-3.3 C (26.1 F)	n/a	n/a
Aug	23.9 C (75.0 F)	-6.1 C (21.0 F)	n/a	n/a
Sep	22.8 C (73.0 F)	-15.6 C (3.9 F)	n/a	n/a
Oct	17.2 C (63.0 F)	-20.6 C (-5.1 F)	n/a	n/a
Nov	12.2 C (54.0 F)	-33.3 C (-27.9 F)	n/a	n/a
Dec	8.3 C (46.9 F)	-34.4 C (-29.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Berthoud Pass still stand. 1965 holds the most, with 105.

Standing records at Berthoud Pass by the year they were set
Year set	Standing records
1950	20
1963	32
1964	77
1965	105
1966	80
1967	60
1968	60
1969	86
1970	59
1971	82
1972	46
1973	81
1974	68
1975	68
1976	36
1977	47
1978	74
1979	65
1980	80
1981	74
1982	41
1983	54
1984	51
1985	18

Wettest Day of Each Month

May: 77.7 mm (3.1 in)

The wettest day on record for each calendar month at Berthoud Pass. The most was 77.7 mm (3.1 in) on 7 May 1969.

Record daily precipitation for each month at Berthoud Pass
Month	Record daily precipitation (mm)	Date
Jan	31.5 mm (1.2 in)	25 January 1975
Feb	21.6 mm (0.9 in)	15 February 1984
Mar	42.2 mm (1.7 in)	11 March 1977
Apr	36.1 mm (1.4 in)	28 April 1983
May	77.7 mm (3.1 in)	7 May 1969
Jun	44.7 mm (1.8 in)	8 June 1979
Jul	30.2 mm (1.2 in)	23 July 1965
Aug	32.5 mm (1.3 in)	2 August 1983
Sep	36.8 mm (1.4 in)	22 September 1970
Oct	30.5 mm (1.2 in)	4 October 1969
Nov	34.8 mm (1.4 in)	14 November 1983
Dec	38.1 mm (1.5 in)	5 December 1977

Period of Record Coverage

1950 to 1985

24 years of record at Berthoud Pass, 1950 to 1985. 3 years have data for under 90 percent of days and are left out of rankings: 1950, 1963, 1985.

Days with data per year at Berthoud Pass
Year	Days with data	Share of year	Complete
1950	118	32%	No
1963	122	33%	No
1964	366	100%	Yes
1965	365	100%	Yes
1966	364	100%	Yes
1967	362	99%	Yes
1968	365	100%	Yes
1969	365	100%	Yes
1970	363	99%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	334	92%	Yes
1974	364	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	364	100%	Yes
1978	363	99%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	364	100%	Yes
1982	364	100%	Yes
1983	363	99%	Yes
1984	365	100%	Yes
1985	118	32%	No

Latest Records

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

Climate Trend

20 complete years, 1964 to 1984

One stripe for each of 20 complete years at Berthoud Pass, 1964 to 1984. Blue stripes are years cooler than the station's own mean of -1.6 C (29.2 F); red stripes are warmer. The coolest year was 1975, at -2.1 C (28.2 F), and the warmest was 1981, at -0.2 C (31.7 F). The strongest colour marks a difference of 1.4 C (2.5 F).

Annual mean temperature at Berthoud Pass as warming stripes, 1964 to 1984
Year	Annual mean temperature	Difference from the station mean
1964	-2.1 C	-0.52 C
1965	-1.9 C	-0.38 C
1966	-1.2 C	+0.34 C
1967	-1.7 C	-0.13 C
1968	-2.1 C	-0.53 C
1969	-1.3 C	+0.28 C
1970	-2.0 C	-0.48 C
1971	-2.0 C	-0.45 C
1972	-1.5 C	+0.11 C
1974	-1.6 C	-0.04 C
1975	-2.1 C	-0.56 C
1976	-1.4 C	+0.15 C
1977	-1.0 C	+0.53 C
1978	-1.2 C	+0.41 C
1979	-1.7 C	-0.12 C
1980	-0.9 C	+0.71 C
1981	-0.2 C	+1.39 C
1982	-2.0 C	-0.40 C
1983	-1.4 C	+0.15 C
1984	-2.0 C	-0.47 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

1950 to 1985

Yearly extremes at Berthoud Pass: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	24.4 C (75.9 F)	1973	21.4 C (70.5 F)	24
Coldest night (TNn)	-36.7 C (-34.1 F)	1985	-30.0 C (-22.0 F)	24
Wettest day (Rx1day)	77.7 mm (3.1 in)	1969	31.8 mm (1.3 in)	24
Wettest five days (Rx5day)	125.0 mm (4.9 in)	1969	65.7 mm (2.6 in)	24
Longest dry spell (CDD)	38 days	1980	15 days	24

Hottest day (TXx)

The hottest day of the year at Berthoud Pass, 1950 to 1985. The record is 24.4 C (75.9 F) in 1973, marked on the chart; the median year is 21.4 C (70.5 F).

Hottest day (TXx) at Berthoud Pass by year
Year	Hottest day (TXx)
1950	8.9 C (48.0 F)
1963	18.3 C (64.9 F)
1964	22.2 C (72.0 F)
1965	18.3 C (64.9 F)
1966	22.2 C (72.0 F)
1967	21.1 C (70.0 F)
1968	20.0 C (68.0 F)
1969	22.8 C (73.0 F)
1970	21.1 C (70.0 F)
1971	23.3 C (73.9 F)
1972	22.2 C (72.0 F)
1973	24.4 C (75.9 F)
1974	21.1 C (70.0 F)
1975	21.1 C (70.0 F)
1976	21.1 C (70.0 F)
1977	21.1 C (70.0 F)
1978	24.4 C (75.9 F)
1979	23.9 C (75.0 F)
1980	22.2 C (72.0 F)
1981	22.2 C (72.0 F)
1982	21.1 C (70.0 F)
1983	21.7 C (71.1 F)
1984	21.7 C (71.1 F)
1985	11.1 C (52.0 F)

Coldest night (TNn)

The coldest night of the year at Berthoud Pass, 1950 to 1985. The record is -36.7 C (-34.1 F) in 1985, marked on the chart; the median year is -30.0 C (-22.0 F).

Coldest night (TNn) at Berthoud Pass by year
Year	Coldest night (TNn)
1950	-30.6 C (-23.1 F)
1963	-23.3 C (-9.9 F)
1964	-28.3 C (-18.9 F)
1965	-31.1 C (-24.0 F)
1966	-30.0 C (-22.0 F)
1967	-28.3 C (-18.9 F)
1968	-26.7 C (-16.1 F)
1969	-26.1 C (-15.0 F)
1970	-30.0 C (-22.0 F)
1971	-35.6 C (-32.1 F)
1972	-33.3 C (-27.9 F)
1973	-24.4 C (-11.9 F)
1974	-28.9 C (-20.0 F)
1975	-33.9 C (-29.0 F)
1976	-33.3 C (-27.9 F)
1977	-27.2 C (-17.0 F)
1978	-34.4 C (-29.9 F)
1979	-36.1 C (-33.0 F)
1980	-25.6 C (-14.1 F)
1981	-30.0 C (-22.0 F)
1982	-30.6 C (-23.1 F)
1983	-28.3 C (-18.9 F)
1984	-34.4 C (-29.9 F)
1985	-36.7 C (-34.1 F)

Wettest day (Rx1day)

The wettest day of the year at Berthoud Pass, 1950 to 1985. The record is 77.7 mm (3.1 in) in 1969, marked on the chart; the median year is 31.8 mm (1.3 in).

Wettest day (Rx1day) at Berthoud Pass by year
Year	Wettest day (Rx1day)
1950	18.5 mm (0.7 in)
1963	23.6 mm (0.9 in)
1964	31.2 mm (1.2 in)
1965	30.2 mm (1.2 in)
1966	26.2 mm (1.0 in)
1967	32.3 mm (1.3 in)
1968	24.1 mm (0.9 in)
1969	77.7 mm (3.1 in)
1970	36.8 mm (1.4 in)
1971	27.4 mm (1.1 in)
1972	33.3 mm (1.3 in)
1973	38.6 mm (1.5 in)
1974	34.5 mm (1.4 in)
1975	33.0 mm (1.3 in)
1976	22.4 mm (0.9 in)
1977	42.2 mm (1.7 in)
1978	30.5 mm (1.2 in)
1979	44.7 mm (1.8 in)
1980	37.3 mm (1.5 in)
1981	30.5 mm (1.2 in)
1982	53.3 mm (2.1 in)
1983	50.3 mm (2.0 in)
1984	23.9 mm (0.9 in)
1985	26.7 mm (1.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Berthoud Pass, 1950 to 1985. The record is 125.0 mm (4.9 in) in 1969, marked on the chart; the median year is 65.7 mm (2.6 in).

Wettest five days (Rx5day) at Berthoud Pass by year
Year	Wettest five days (Rx5day)
1950	30.0 mm (1.2 in)
1963	36.8 mm (1.4 in)
1964	82.5 mm (3.2 in)
1965	84.8 mm (3.3 in)
1966	52.7 mm (2.1 in)
1967	52.4 mm (2.1 in)
1968	62.4 mm (2.5 in)
1969	125.0 mm (4.9 in)
1970	65.0 mm (2.6 in)
1971	82.6 mm (3.3 in)
1972	69.7 mm (2.7 in)
1973	72.1 mm (2.8 in)
1974	105.7 mm (4.2 in)
1975	49.5 mm (1.9 in)
1976	51.8 mm (2.0 in)
1977	73.6 mm (2.9 in)
1978	68.1 mm (2.7 in)
1979	62.5 mm (2.5 in)
1980	66.4 mm (2.6 in)
1981	60.9 mm (2.4 in)
1982	116.3 mm (4.6 in)
1983	80.0 mm (3.1 in)
1984	62.9 mm (2.5 in)
1985	45.0 mm (1.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Berthoud Pass, 1950 to 1985. The record is 38 days in 1980, marked on the chart; the median year is 15 days.

Longest dry spell (CDD) at Berthoud Pass by year
Year	Longest dry spell (CDD)
1950	6 days
1963	26 days
1964	13 days
1965	16 days
1966	13 days
1967	10 days
1968	14 days
1969	8 days
1970	13 days
1971	18 days
1972	12 days
1973	20 days
1974	21 days
1975	19 days
1976	16 days
1977	15 days
1978	27 days
1979	24 days
1980	38 days
1981	9 days
1982	11 days
1983	21 days
1984	10 days
1985	8 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 Berthoud Pass falls on 25 June and the median first autumn frost on 16 August, which leaves a median of 56 days between them.

Frost dates and growing season at Berthoud Pass
Measure	Median, all years	Earliest period	Recent period (1964 to 1984)	Recent against earliest	Fitted trend
Last spring frost	25 June	n/a	25 June	n/a	n/a
First autumn frost	16 August	n/a	16 August	n/a	n/a
Growing days	56 days	n/a	56 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 Berthoud Pass standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Berthoud Pass 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 2026-10-14 (14 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).