Grass Creek Weather Records (USC00484036)

Record envelope, standing records and threshold days for Grass Creek (USC00484036), Wyoming, United States, with 42 years of record.

Key Facts for Grass Creek

Grass Creek (USC00484036) is a weather station in Wyoming, United States at 43.95 latitude and -108.65 longitude, 1,701 m (5,579 ft) above sea level.
The station reports from 1949 to 1990, 42 years of record.
1,464 records set at Grass Creek still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Grass Creek set a daily record snowfall of 1.3 cm (0.5 in) on 23 March 1990.

About the Station

Location: Wyoming, United States, 43.95 latitude, -108.65 longitude.
Elevation: 1,701 m (5,579 ft).
Period of record: 1949 to 1990, 42 years.
Eligible elements: prcp, snow, snwd.

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 Grass Creek. 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 Grass Creek, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	20.0 C (68.0 F)	-41.1 C (-42.0 F)	n/a	n/a
Feb	21.1 C (70.0 F)	-40.0 C (-40.0 F)	n/a	n/a
Mar	23.3 C (73.9 F)	-24.4 C (-11.9 F)	n/a	n/a
Apr	28.9 C (84.0 F)	-23.3 C (-9.9 F)	n/a	n/a
May	31.7 C (89.1 F)	-10.0 C (14.0 F)	n/a	n/a
Jun	36.7 C (98.1 F)	-7.2 C (19.0 F)	n/a	n/a
Jul	40.0 C (104.0 F)	0.6 C (33.1 F)	n/a	n/a
Aug	37.8 C (100.0 F)	0.0 C (32.0 F)	n/a	n/a
Sep	34.4 C (93.9 F)	-11.1 C (12.0 F)	n/a	n/a
Oct	28.3 C (82.9 F)	-15.0 C (5.0 F)	n/a	n/a
Nov	21.7 C (71.1 F)	-31.7 C (-25.1 F)	n/a	n/a
Dec	17.8 C (64.0 F)	-45.0 C (-49.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Grass Creek still stand. 1987 holds the most, with 94.

Standing records at Grass Creek by the year they were set
Year set	Standing records
1966	48
1967	46
1968	47
1969	82
1970	53
1971	55
1972	77
1973	53
1974	42
1975	46
1976	33
1977	52
1978	59
1979	67
1980	77
1981	61
1982	70
1983	81
1984	31
1985	41
1986	72
1987	94
1988	78
1989	90
1990	9

All-Time Record Progression

1 new records

1 all-time records were set at Grass Creek between 23 February 1987 and 23 February 1987. Each dot is a new record.

Wettest Day of Each Month

Jul: 110.7 mm (4.4 in)

The wettest day on record for each calendar month at Grass Creek. The most was 110.7 mm (4.4 in) on 26 July 1962.

Record daily precipitation for each month at Grass Creek
Month	Record daily precipitation (mm)	Date
Jan	11.7 mm (0.5 in)	8 January 1962
Feb	33.8 mm (1.3 in)	14 February 1983
Mar	19.1 mm (0.8 in)	27 March 1981
Apr	62.7 mm (2.5 in)	25 April 1964
May	62.7 mm (2.5 in)	18 May 1978
Jun	56.9 mm (2.2 in)	12 June 1958
Jul	110.7 mm (4.4 in)	26 July 1962
Aug	48.8 mm (1.9 in)	18 August 1968
Sep	45.7 mm (1.8 in)	20 September 1961
Oct	25.4 mm (1.0 in)	21 October 1953
Nov	29.2 mm (1.1 in)	7 November 1950
Dec	20.3 mm (0.8 in)	29 December 1972

Period of Record Coverage

1966 to 1990

25 years of record at Grass Creek, 1966 to 1990. 11 years have data for under 90 percent of days and are left out of rankings: 1966, 1967, 1968, 1974, 1975, 1976, 1978, 1983 and others.

Days with data per year at Grass Creek
Year	Days with data	Share of year	Complete
1966	147	40%	No
1967	272	75%	No
1968	321	88%	No
1969	362	99%	Yes
1970	356	98%	Yes
1971	362	99%	Yes
1972	331	90%	Yes
1973	329	90%	Yes
1974	271	74%	No
1975	271	74%	No
1976	272	74%	No
1977	352	96%	Yes
1978	291	80%	No
1979	363	99%	Yes
1980	364	99%	Yes
1981	364	100%	Yes
1982	349	96%	Yes
1983	291	80%	No
1984	209	57%	No
1985	109	30%	No
1986	341	93%	Yes
1987	358	98%	Yes
1988	362	99%	Yes
1989	340	93%	Yes
1990	89	24%	No

Latest Records

Latest records at Grass Creek
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
23 March 1990	Grass Creek, US	daily snowfall	1.3 cm (0.5 in)	1.3 cm (0.5 in)	40 years	19 of 100 (Routine)
12 March 1990	Grass Creek, US	daily snowfall	7.6 cm (3.0 in)	5.6 cm (2.2 in)	9 years	19 of 100 (Routine)
7 March 1990	Grass Creek, US	daily snowfall	2.5 cm (1.0 in)	2.5 cm (1.0 in)	39 years	20 of 100 (Routine)
7 March 1990	Grass Creek, US	daily rain	1.3 mm (0.05 in)	1.3 mm (0.05 in)	39 years	19 of 100 (Routine)
27 January 1990	Grass Creek, US	daily snowfall	2.5 cm (1.0 in)	2.0 cm (0.8 in)	10 years	11 of 100 (Routine)
17 January 1990	Grass Creek, US	daily snowfall	5.1 cm (2.0 in)	5.1 cm (2.0 in)	39 years	26 of 100 (Routine)
17 January 1990	Grass Creek, US	daily rain	1.3 mm (0.05 in)	0.3 mm (0.01 in)	6 years	6 of 100 (Routine)
3 January 1990	Grass Creek, US	daily snowfall	10.2 cm (4.0 in)	5.1 cm (2.0 in)	19 years	20 of 100 (Routine)
21 December 1989	Grass Creek, US	daily snowfall	5.1 cm (2.0 in)	5.1 cm (2.0 in)	39 years	20 of 100 (Routine)
15 December 1989	Grass Creek, US	daily snowfall	7.6 cm (3.0 in)	5.8 cm (2.3 in)	6 years	11 of 100 (Routine)
11 December 1989	Grass Creek, US	daily snowfall (Tie)	2.5 cm (1.0 in)	tie	10 years	1 of 100 (Routine)
10 December 1989	Grass Creek, US	daily rain	10.2 mm (0.4 in)	9.4 mm (0.37 in)	32 years	20 of 100 (Routine)
5 November 1989	Grass Creek, US	daily snow depth	7.6 cm (3.0 in)	2.5 cm (1.0 in)	18 years	16 of 100 (Routine)
4 November 1989	Grass Creek, US	daily snow depth	7.6 cm (3.0 in)	7.6 cm (3.0 in)	36 years	20 of 100 (Routine)
3 November 1989	Grass Creek, US	daily snow depth	7.6 cm (3.0 in)	7.6 cm (3.0 in)	36 years	20 of 100 (Routine)
2 November 1989	Grass Creek, US	daily snow depth	10.2 cm (4.0 in)	7.7 cm (3.0 in)	22 years	32 of 100 (Routine)
1 November 1989	Grass Creek, US	daily snow depth	10.2 cm (4.0 in)	10.2 cm (4.0 in)	36 years	44 of 100 (Notable)
31 October 1989	Grass Creek, US	daily snow depth	12.7 cm (5.0 in)	10.2 cm (4.0 in)	23 years	20 of 100 (Routine)
30 October 1989	Grass Creek, US	daily snow depth	15.2 cm (6.0 in)	15.2 cm (6.0 in)	39 years	30 of 100 (Routine)
29 October 1989	Grass Creek, US	daily snow depth	15.2 cm (6.0 in)	15.2 cm (6.0 in)	39 years	30 of 100 (Routine)

Climate Trend

13 complete years, 1969 to 1988

One stripe for each of 13 complete years at Grass Creek, 1969 to 1988. Blue stripes are years cooler than the station's own mean of 7.0 C (44.6 F); red stripes are warmer. The coolest year was 1982, at 5.8 C (42.4 F), and the warmest was 1988, at 8.2 C (46.7 F). The strongest colour marks a difference of 1.3 C (2.3 F).

Annual mean temperature at Grass Creek as warming stripes, 1969 to 1988
Year	Annual mean temperature	Difference from the station mean
1969	7.4 C	+0.36 C
1970	6.6 C	-0.43 C
1971	6.5 C	-0.49 C
1972	6.1 C	-0.95 C
1973	6.6 C	-0.46 C
1977	7.4 C	+0.36 C
1979	6.4 C	-0.61 C
1980	7.3 C	+0.29 C
1981	7.8 C	+0.74 C
1982	5.8 C	-1.27 C
1986	7.4 C	+0.38 C
1987	7.9 C	+0.92 C
1988	8.2 C	+1.14 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

1949 to 1990

Yearly extremes at Grass Creek: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.0 C (104.0 F)	1970	36.1 C (97.0 F)	25
Coldest night (TNn)	-45.0 C (-49.0 F)	1983	-30.0 C (-22.0 F)	25
Wettest day (Rx1day)	110.7 mm (4.4 in)	1962	28.6 mm (1.1 in)	42
Wettest five days (Rx5day)	126.9 mm (5.0 in)	1962	39.0 mm (1.5 in)	42
Longest dry spell (CDD)	132 days	1952	46 days	42

Hottest day (TXx)

The hottest day of the year at Grass Creek, 1949 to 1990. The record is 40.0 C (104.0 F) in 1970, marked on the chart; the median year is 36.1 C (97.0 F).

Hottest day (TXx) at Grass Creek by year
Year	Hottest day (TXx)
1949	n/a
1950	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	35.0 C (95.0 F)
1967	33.3 C (91.9 F)
1968	33.9 C (93.0 F)
1969	34.4 C (93.9 F)
1970	40.0 C (104.0 F)
1971	34.4 C (93.9 F)
1972	37.8 C (100.0 F)
1973	33.9 C (93.0 F)
1974	36.1 C (97.0 F)
1975	36.7 C (98.1 F)
1976	35.6 C (96.1 F)
1977	36.1 C (97.0 F)
1978	33.3 C (91.9 F)
1979	37.8 C (100.0 F)
1980	34.4 C (93.9 F)
1981	36.7 C (98.1 F)
1982	35.6 C (96.1 F)
1983	37.2 C (99.0 F)
1984	36.1 C (97.0 F)
1985	28.3 C (82.9 F)
1986	36.7 C (98.1 F)
1987	37.2 C (99.0 F)
1988	38.9 C (102.0 F)
1989	38.9 C (102.0 F)
1990	18.9 C (66.0 F)

Coldest night (TNn)

The coldest night of the year at Grass Creek, 1949 to 1990. The record is -45.0 C (-49.0 F) in 1983, marked on the chart; the median year is -30.0 C (-22.0 F).

Coldest night (TNn) at Grass Creek by year
Year	Coldest night (TNn)
1949	n/a
1950	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	-21.1 C (-6.0 F)
1967	-26.7 C (-16.1 F)
1968	-32.8 C (-27.0 F)
1969	-27.8 C (-18.0 F)
1970	-25.6 C (-14.1 F)
1971	-25.0 C (-13.0 F)
1972	-35.6 C (-32.1 F)
1973	-31.1 C (-24.0 F)
1974	-31.7 C (-25.1 F)
1975	-27.8 C (-18.0 F)
1976	-23.9 C (-11.0 F)
1977	-27.8 C (-18.0 F)
1978	-33.3 C (-27.9 F)
1979	-30.6 C (-23.1 F)
1980	-32.2 C (-26.0 F)
1981	-30.0 C (-22.0 F)
1982	-30.0 C (-22.0 F)
1983	-45.0 C (-49.0 F)
1984	-41.1 C (-42.0 F)
1985	-31.7 C (-25.1 F)
1986	-28.9 C (-20.0 F)
1987	-26.7 C (-16.1 F)
1988	-23.3 C (-9.9 F)
1989	-40.0 C (-40.0 F)
1990	-20.6 C (-5.1 F)

Wettest day (Rx1day)

The wettest day of the year at Grass Creek, 1949 to 1990. The record is 110.7 mm (4.4 in) in 1962, marked on the chart; the median year is 28.6 mm (1.1 in).

Wettest day (Rx1day) at Grass Creek by year
Year	Wettest day (Rx1day)
1949	20.3 mm (0.8 in)
1950	29.2 mm (1.1 in)
1951	27.9 mm (1.1 in)
1952	40.6 mm (1.6 in)
1953	25.4 mm (1.0 in)
1954	10.9 mm (0.4 in)
1955	19.8 mm (0.8 in)
1956	31.5 mm (1.2 in)
1957	37.1 mm (1.5 in)
1958	56.9 mm (2.2 in)
1959	32.0 mm (1.3 in)
1960	42.4 mm (1.7 in)
1961	45.7 mm (1.8 in)
1962	110.7 mm (4.4 in)
1963	44.2 mm (1.7 in)
1964	62.7 mm (2.5 in)
1965	25.1 mm (1.0 in)
1966	30.2 mm (1.2 in)
1967	46.5 mm (1.8 in)
1968	50.3 mm (2.0 in)
1969	12.7 mm (0.5 in)
1970	30.0 mm (1.2 in)
1971	25.4 mm (1.0 in)
1972	24.1 mm (0.9 in)
1973	35.6 mm (1.4 in)
1974	17.8 mm (0.7 in)
1975	25.4 mm (1.0 in)
1976	19.3 mm (0.8 in)
1977	12.4 mm (0.5 in)
1978	62.7 mm (2.5 in)
1979	35.6 mm (1.4 in)
1980	18.8 mm (0.7 in)
1981	21.1 mm (0.8 in)
1982	40.4 mm (1.6 in)
1983	33.8 mm (1.3 in)
1984	19.1 mm (0.8 in)
1985	15.0 mm (0.6 in)
1986	19.1 mm (0.8 in)
1987	42.7 mm (1.7 in)
1988	19.6 mm (0.8 in)
1989	21.6 mm (0.9 in)
1990	2.5 mm (0.10 in)

Wettest five days (Rx5day)

The wettest five days of the year at Grass Creek, 1949 to 1990. The record is 126.9 mm (5.0 in) in 1962, marked on the chart; the median year is 39.0 mm (1.5 in).

Wettest five days (Rx5day) at Grass Creek by year
Year	Wettest five days (Rx5day)
1949	21.8 mm (0.9 in)
1950	29.5 mm (1.2 in)
1951	35.5 mm (1.4 in)
1952	53.8 mm (2.1 in)
1953	38.9 mm (1.5 in)
1954	14.2 mm (0.6 in)
1955	28.2 mm (1.1 in)
1956	35.1 mm (1.4 in)
1957	69.6 mm (2.7 in)
1958	87.9 mm (3.5 in)
1959	35.0 mm (1.4 in)
1960	48.5 mm (1.9 in)
1961	92.7 mm (3.6 in)
1962	126.9 mm (5.0 in)
1963	60.1 mm (2.4 in)
1964	102.3 mm (4.0 in)
1965	32.3 mm (1.3 in)
1966	36.8 mm (1.4 in)
1967	78.2 mm (3.1 in)
1968	94.0 mm (3.7 in)
1969	19.8 mm (0.8 in)
1970	30.0 mm (1.2 in)
1971	40.6 mm (1.6 in)
1972	48.2 mm (1.9 in)
1973	36.4 mm (1.4 in)
1974	39.1 mm (1.5 in)
1975	40.2 mm (1.6 in)
1976	39.7 mm (1.6 in)
1977	18.0 mm (0.7 in)
1978	116.8 mm (4.6 in)
1979	39.4 mm (1.6 in)
1980	30.5 mm (1.2 in)
1981	36.6 mm (1.4 in)
1982	76.2 mm (3.0 in)
1983	33.8 mm (1.3 in)
1984	33.6 mm (1.3 in)
1985	23.9 mm (0.9 in)
1986	40.2 mm (1.6 in)
1987	66.8 mm (2.6 in)
1988	23.7 mm (0.9 in)
1989	42.9 mm (1.7 in)
1990	2.5 mm (0.10 in)

Longest dry spell (CDD)

The longest dry spell of the year at Grass Creek, 1949 to 1990. The record is 132 days in 1952, marked on the chart; the median year is 46 days.

Longest dry spell (CDD) at Grass Creek by year
Year	Longest dry spell (CDD)
1949	51 days
1950	54 days
1951	61 days
1952	132 days
1953	41 days
1954	66 days
1955	46 days
1956	51 days
1957	50 days
1958	63 days
1959	42 days
1960	47 days
1961	43 days
1962	45 days
1963	52 days
1964	105 days
1965	94 days
1966	61 days
1967	38 days
1968	80 days
1969	62 days
1970	46 days
1971	79 days
1972	30 days
1973	35 days
1974	42 days
1975	30 days
1976	66 days
1977	54 days
1978	43 days
1979	54 days
1980	30 days
1981	34 days
1982	37 days
1983	29 days
1984	24 days
1985	30 days
1986	29 days
1987	37 days
1988	40 days
1989	39 days
1990	27 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 Grass Creek standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Grass Creek 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).