Grand Valley Weather Records (USC00053508)

Record envelope, standing records and threshold days for Grand Valley (USC00053508), Colorado, United States, with 78 years of record.

Key Facts for Grand Valley

Grand Valley (USC00053508) is a weather station in Colorado, United States at 39.45 latitude and -108.05 longitude, 1,552 m (5,092 ft) above sea level.
The station reports from 1904 to 1981, 78 years of record.
1,464 records set at Grand Valley 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, 39.45 latitude, -108.05 longitude.
Elevation: 1,552 m (5,092 ft).
Period of record: 1904 to 1981, 78 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 Grand Valley. 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 Grand Valley, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	14.4 C (57.9 F)	-30.0 C (-22.0 F)	n/a	n/a
Feb	20.0 C (68.0 F)	-26.1 C (-15.0 F)	n/a	n/a
Mar	26.1 C (79.0 F)	-15.6 C (3.9 F)	n/a	n/a
Apr	31.1 C (88.0 F)	-11.1 C (12.0 F)	n/a	n/a
May	35.0 C (95.0 F)	-7.2 C (19.0 F)	n/a	n/a
Jun	39.4 C (102.9 F)	-0.6 C (30.9 F)	n/a	n/a
Jul	40.6 C (105.1 F)	3.9 C (39.0 F)	n/a	n/a
Aug	41.7 C (107.1 F)	2.2 C (36.0 F)	n/a	n/a
Sep	37.8 C (100.0 F)	-5.6 C (21.9 F)	n/a	n/a
Oct	31.7 C (89.1 F)	-11.1 C (12.0 F)	n/a	n/a
Nov	25.6 C (78.1 F)	-21.1 C (-6.0 F)	n/a	n/a
Dec	17.8 C (64.0 F)	-28.9 C (-20.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Grand Valley still stand. 1909 holds the most, with 81.

Standing records at Grand Valley by the year they were set
Year set	Standing records
1904	12
1905	64
1906	54
1907	61
1908	62
1909	81
1910	74
1911	75
1912	67
1913	61
1914	12
1965	35
1966	63
1967	58
1968	39
1969	50
1970	50
1971	74
1972	46
1973	40
1974	45
1975	47
1976	33
1977	48
1978	59
1979	57
1980	66
1981	31

Wettest Day of Each Month

Sep: 63.5 mm (2.5 in)

The wettest day on record for each calendar month at Grand Valley. The most was 63.5 mm (2.5 in) on 13 September 1969.

Record daily precipitation for each month at Grand Valley
Month	Record daily precipitation (mm)	Date
Jan	25.4 mm (1.0 in)	23 January 1909
Feb	24.9 mm (1.0 in)	4 February 1908
Mar	30.0 mm (1.2 in)	20 March 1912
Apr	24.9 mm (1.0 in)	7 April 1906
May	27.2 mm (1.1 in)	3 May 1981
Jun	40.9 mm (1.6 in)	24 June 1969
Jul	31.0 mm (1.2 in)	7 July 1906
Aug	22.6 mm (0.9 in)	31 August 1906
Sep	63.5 mm (2.5 in)	13 September 1969
Oct	46.0 mm (1.8 in)	5 October 1911
Nov	49.5 mm (1.9 in)	5 November 1911
Dec	51.3 mm (2.0 in)	6 December 1966

Period of Record Coverage

1904 to 1981

28 years of record at Grand Valley, 1904 to 1981. 6 years have data for under 90 percent of days and are left out of rankings: 1904, 1911, 1913, 1914, 1965, 1981.

Days with data per year at Grand Valley
Year	Days with data	Share of year	Complete
1904	91	25%	No
1905	360	99%	Yes
1906	362	99%	Yes
1907	363	99%	Yes
1908	350	96%	Yes
1909	331	91%	Yes
1910	329	90%	Yes
1911	316	87%	No
1912	362	99%	Yes
1913	325	89%	No
1914	119	33%	No
1965	244	67%	No
1966	362	99%	Yes
1967	361	99%	Yes
1968	360	98%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	364	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	364	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	363	99%	Yes
1980	366	100%	Yes
1981	151	41%	No

Latest Records

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

Climate Trend

19 complete years, 1905 to 1980

One stripe for each of 19 complete years at Grand Valley, 1905 to 1980. Blue stripes are years cooler than the station's own mean of 9.7 C (49.4 F); red stripes are warmer. The coolest year was 1912, at 8.3 C (47.0 F), and the warmest was 1980, at 11.0 C (51.9 F). The strongest colour marks a difference of 1.4 C (2.5 F).

Annual mean temperature at Grand Valley as warming stripes, 1905 to 1980
Year	Annual mean temperature	Difference from the station mean
1905	9.0 C	-0.67 C
1906	9.9 C	+0.21 C
1907	10.2 C	+0.49 C
1912	8.3 C	-1.33 C
1966	10.6 C	+0.92 C
1967	10.5 C	+0.85 C
1968	9.1 C	-0.61 C
1969	9.8 C	+0.17 C
1970	10.1 C	+0.40 C
1971	9.5 C	-0.14 C
1972	10.1 C	+0.45 C
1973	8.9 C	-0.73 C
1974	9.3 C	-0.36 C
1975	8.6 C	-1.05 C
1976	9.6 C	-0.11 C
1977	10.6 C	+0.91 C
1978	9.7 C	+0.05 C
1979	8.8 C	-0.82 C
1980	11.0 C	+1.37 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 1981

Yearly extremes at Grand Valley: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	41.7 C (107.1 F)	1979	38.3 C (100.9 F)	28
Coldest night (TNn)	-30.0 C (-22.0 F)	1979	-24.7 C (-12.5 F)	28
Wettest day (Rx1day)	63.5 mm (2.5 in)	1969	23.0 mm (0.9 in)	28
Wettest five days (Rx5day)	76.4 mm (3.0 in)	1966	40.1 mm (1.6 in)	28
Longest dry spell (CDD)	102 days	1972	34 days	28

Hottest day (TXx)

The hottest day of the year at Grand Valley, 1904 to 1981. The record is 41.7 C (107.1 F) in 1979, marked on the chart; the median year is 38.3 C (100.9 F).

Hottest day (TXx) at Grand Valley by year
Year	Hottest day (TXx)
1904	27.2 C (81.0 F)
1905	36.1 C (97.0 F)
1906	36.7 C (98.1 F)
1907	36.1 C (97.0 F)
1908	37.8 C (100.0 F)
1909	37.2 C (99.0 F)
1910	38.3 C (100.9 F)
1911	37.2 C (99.0 F)
1912	37.2 C (99.0 F)
1913	38.9 C (102.0 F)
1914	26.1 C (79.0 F)
1965	37.8 C (100.0 F)
1966	39.4 C (102.9 F)
1967	38.9 C (102.0 F)
1968	38.3 C (100.9 F)
1969	38.3 C (100.9 F)
1970	38.3 C (100.9 F)
1971	40.0 C (104.0 F)
1972	38.9 C (102.0 F)
1973	37.8 C (100.0 F)
1974	39.4 C (102.9 F)
1975	38.3 C (100.9 F)
1976	40.6 C (105.1 F)
1977	37.8 C (100.0 F)
1978	40.6 C (105.1 F)
1979	41.7 C (107.1 F)
1980	38.3 C (100.9 F)
1981	31.7 C (89.1 F)

Coldest night (TNn)

The coldest night of the year at Grand Valley, 1904 to 1981. The record is -30.0 C (-22.0 F) in 1979, marked on the chart; the median year is -24.7 C (-12.5 F).

Coldest night (TNn) at Grand Valley by year
Year	Coldest night (TNn)
1904	-24.4 C (-11.9 F)
1905	-25.0 C (-13.0 F)
1906	-23.9 C (-11.0 F)
1907	-19.4 C (-2.9 F)
1908	-22.8 C (-9.0 F)
1909	-26.1 C (-15.0 F)
1910	-26.7 C (-16.1 F)
1911	-25.6 C (-14.1 F)
1912	-26.7 C (-16.1 F)
1913	-22.2 C (-8.0 F)
1914	-24.4 C (-11.9 F)
1965	-14.4 C (6.1 F)
1966	-21.1 C (-6.0 F)
1967	-23.9 C (-11.0 F)
1968	-26.7 C (-16.1 F)
1969	-20.6 C (-5.1 F)
1970	-20.0 C (-4.0 F)
1971	-27.8 C (-18.0 F)
1972	-25.0 C (-13.0 F)
1973	-27.2 C (-17.0 F)
1974	-26.1 C (-15.0 F)
1975	-25.0 C (-13.0 F)
1976	-24.4 C (-11.9 F)
1977	-25.6 C (-14.1 F)
1978	-28.9 C (-20.0 F)
1979	-30.0 C (-22.0 F)
1980	-16.7 C (1.9 F)
1981	-16.1 C (3.0 F)

Wettest day (Rx1day)

The wettest day of the year at Grand Valley, 1904 to 1981. The record is 63.5 mm (2.5 in) in 1969, marked on the chart; the median year is 23.0 mm (0.9 in).

Wettest day (Rx1day) at Grand Valley by year
Year	Wettest day (Rx1day)
1904	12.4 mm (0.5 in)
1905	41.1 mm (1.6 in)
1906	32.0 mm (1.3 in)
1907	18.8 mm (0.7 in)
1908	33.5 mm (1.3 in)
1909	25.4 mm (1.0 in)
1910	18.8 mm (0.7 in)
1911	49.5 mm (1.9 in)
1912	30.0 mm (1.2 in)
1913	22.1 mm (0.9 in)
1914	19.6 mm (0.8 in)
1965	33.5 mm (1.3 in)
1966	51.3 mm (2.0 in)
1967	23.4 mm (0.9 in)
1968	17.5 mm (0.7 in)
1969	63.5 mm (2.5 in)
1970	22.1 mm (0.9 in)
1971	17.3 mm (0.7 in)
1972	25.4 mm (1.0 in)
1973	16.0 mm (0.6 in)
1974	16.8 mm (0.7 in)
1975	14.2 mm (0.6 in)
1976	23.9 mm (0.9 in)
1977	14.2 mm (0.6 in)
1978	22.9 mm (0.9 in)
1979	19.6 mm (0.8 in)
1980	23.1 mm (0.9 in)
1981	27.2 mm (1.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Grand Valley, 1904 to 1981. The record is 76.4 mm (3.0 in) in 1966, marked on the chart; the median year is 40.1 mm (1.6 in).

Wettest five days (Rx5day) at Grand Valley by year
Year	Wettest five days (Rx5day)
1904	25.7 mm (1.0 in)
1905	70.0 mm (2.8 in)
1906	44.4 mm (1.7 in)
1907	33.8 mm (1.3 in)
1908	66.8 mm (2.6 in)
1909	43.4 mm (1.7 in)
1910	34.1 mm (1.3 in)
1911	70.6 mm (2.8 in)
1912	41.2 mm (1.6 in)
1913	35.3 mm (1.4 in)
1914	39.4 mm (1.6 in)
1965	50.0 mm (2.0 in)
1966	76.4 mm (3.0 in)
1967	41.0 mm (1.6 in)
1968	30.7 mm (1.2 in)
1969	72.9 mm (2.9 in)
1970	40.4 mm (1.6 in)
1971	42.9 mm (1.7 in)
1972	39.8 mm (1.6 in)
1973	30.8 mm (1.2 in)
1974	26.3 mm (1.0 in)
1975	36.3 mm (1.4 in)
1976	30.5 mm (1.2 in)
1977	25.9 mm (1.0 in)
1978	46.3 mm (1.8 in)
1979	36.3 mm (1.4 in)
1980	42.8 mm (1.7 in)
1981	38.4 mm (1.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Grand Valley, 1904 to 1981. The record is 102 days in 1972, marked on the chart; the median year is 34 days.

Longest dry spell (CDD) at Grand Valley by year
Year	Longest dry spell (CDD)
1904	34 days
1905	39 days
1906	30 days
1907	33 days
1908	32 days
1909	34 days
1910	38 days
1911	58 days
1912	26 days
1913	18 days
1914	25 days
1965	27 days
1966	39 days
1967	31 days
1968	46 days
1969	26 days
1970	38 days
1971	58 days
1972	102 days
1973	39 days
1974	39 days
1975	25 days
1976	88 days
1977	31 days
1978	32 days
1979	50 days
1980	45 days
1981	23 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 Grand Valley standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Grand Valley 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).