Rock Creek Weather Records (USC00357250)

Record envelope, standing records and threshold days for Rock Creek (USC00357250), Oregon, United States, with 91 years of record.

Key Facts for Rock Creek

Rock Creek (USC00357250) is a weather station in Oregon, United States at 44.91 latitude and -118.06 longitude, 1,223 m (4,012 ft) above sea level.
The station reports from 1920 to 2010, 91 years of record.
1,464 records set at Rock Creek still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Rock Creek tied a daily record snow depth of 5.1 cm (2.0 in) on 6 May 2010.

About the Station

Location: Oregon, United States, 44.91 latitude, -118.06 longitude.
Elevation: 1,223 m (4,012 ft).
Period of record: 1920 to 2010, 91 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 Rock 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 Rock Creek, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	8.3 C (46.9 F)	-27.8 C (-18.0 F)	n/a	n/a
Feb	10.6 C (51.1 F)	-27.2 C (-17.0 F)	n/a	n/a
Mar	18.9 C (66.0 F)	-20.0 C (-4.0 F)	n/a	n/a
Apr	26.7 C (80.1 F)	-10.0 C (14.0 F)	n/a	n/a
May	28.9 C (84.0 F)	-3.9 C (25.0 F)	n/a	n/a
Jun	32.8 C (91.0 F)	-3.3 C (26.1 F)	n/a	n/a
Jul	36.1 C (97.0 F)	2.8 C (37.0 F)	n/a	n/a
Aug	33.3 C (91.9 F)	2.8 C (37.0 F)	n/a	n/a
Sep	30.6 C (87.1 F)	-1.7 C (28.9 F)	n/a	n/a
Oct	25.0 C (77.0 F)	-13.3 C (8.1 F)	n/a	n/a
Nov	14.4 C (57.9 F)	-13.3 C (8.1 F)	n/a	n/a
Dec	13.9 C (57.0 F)	-23.9 C (-11.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Rock Creek still stand. 1934 holds the most, with 143.

Standing records at Rock Creek by the year they were set
Year set	Standing records
1927	59
1928	72
1929	56
1930	85
1931	50
1932	70
1933	91
1934	143
1935	79
1936	91
1937	68
1938	61
1939	38
1940	45
1941	60
1942	66
1943	80
1944	54
1945	57
1946	44
1947	65
1948	30

All-Time Record Progression

2 new records

2 all-time records were set at Rock Creek between 23 January 1982 and 31 August 1984. Each dot is a new record.

When Rock Creek set new all-time records
Date	Kind	Detail
1982-01-23	Record daily snowfall	Record daily snowfall 45.7 cm (18.0 in)
1984-08-31	Record daily precipitation	Record daily precipitation 65.0 mm (2.6 in)

Wettest Day of Each Month

Aug: 65.0 mm (2.6 in)

The wettest day on record for each calendar month at Rock Creek. The most was 65.0 mm (2.6 in) on 31 August 1984.

Record daily precipitation for each month at Rock Creek
Month	Record daily precipitation (mm)	Date
Jan	36.3 mm (1.4 in)	23 January 1982
Feb	27.9 mm (1.1 in)	23 February 1986
Mar	27.4 mm (1.1 in)	30 March 1931
Apr	32.3 mm (1.3 in)	21 April 2010
May	36.1 mm (1.4 in)	29 May 2008
Jun	39.9 mm (1.6 in)	6 June 1941
Jul	34.0 mm (1.3 in)	18 July 1997
Aug	65.0 mm (2.6 in)	31 August 1984
Sep	35.1 mm (1.4 in)	8 September 1970
Oct	59.9 mm (2.4 in)	16 October 1947
Nov	54.6 mm (2.1 in)	20 November 1921
Dec	54.6 mm (2.1 in)	22 December 1964

Period of Record Coverage

1925 to 1948

23 years of record at Rock Creek, 1925 to 1948. 5 years have data for under 90 percent of days and are left out of rankings: 1925, 1927, 1939, 1940, 1948.

Days with data per year at Rock Creek
Year	Days with data	Share of year	Complete
1925	1	0%	No
1927	206	56%	No
1928	353	96%	Yes
1929	331	91%	Yes
1930	364	100%	Yes
1931	364	100%	Yes
1932	336	92%	Yes
1933	365	100%	Yes
1934	365	100%	Yes
1935	361	99%	Yes
1936	364	99%	Yes
1937	364	100%	Yes
1938	364	100%	Yes
1939	272	75%	No
1940	304	83%	No
1941	333	91%	Yes
1942	364	100%	Yes
1943	360	99%	Yes
1944	365	100%	Yes
1945	334	92%	Yes
1946	362	99%	Yes
1947	364	100%	Yes
1948	182	50%	No

Latest Records

Latest records at Rock Creek
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
6 May 2010	Rock Creek, US	daily snow depth (Tie)	5.1 cm (2.0 in)	tie	76 years	8 of 100 (Routine)
5 May 2010	Rock Creek, US	monthly snowfall	18.8 cm (7.4 in)	9.9 cm (3.9 in)	35 years	48 of 100 (Notable)
5 May 2010	Rock Creek, US	monthly snow depth	17.8 cm (7.0 in)	7.6 cm (3.0 in)	35 years	36 of 100 (Notable)
5 May 2010	Rock Creek, US	daily rain	19.1 mm (0.8 in)	4.4 mm (0.17 in)	36 years	20 of 100 (Routine)
2 May 2010	Rock Creek, US	daily snowfall	0.3 cm (0.1 in)	0.3 cm (0.1 in)	89 years	20 of 100 (Routine)
21 April 2010	Rock Creek, US	monthly rain	32.3 mm (1.3 in)	1.8 mm (0.07 in)	19 years	28 of 100 (Routine)
15 October 2009	Rock Creek, US	daily rain	9.7 mm (0.38 in)	2.6 mm (0.10 in)	86 years	20 of 100 (Routine)
14 October 2009	Rock Creek, US	daily rain	30.7 mm (1.2 in)	18.0 mm (0.7 in)	64 years	59 of 100 (Notable)
7 August 2009	Rock Creek, US	daily rain	32.0 mm (1.3 in)	27.2 mm (1.1 in)	2 years	49 of 100 (Notable)
6 August 2009	Rock Creek, US	daily rain	5.8 mm (0.23 in)	2.0 mm (0.08 in)	32 years	20 of 100 (Routine)
15 June 2009	Rock Creek, US	daily rain	22.4 mm (0.9 in)	4.6 mm (0.18 in)	80 years	20 of 100 (Routine)
5 June 2009	Rock Creek, US	daily rain	16.0 mm (0.6 in)	1.3 mm (0.05 in)	35 years	20 of 100 (Routine)
4 June 2009	Rock Creek, US	daily rain	34.3 mm (1.4 in)	9.2 mm (0.36 in)	27 years	35 of 100 (Notable)
30 April 2009	Rock Creek, US	daily snowfall	2.8 cm (1.1 in)	0.3 cm (0.1 in)	40 years	20 of 100 (Routine)
29 March 2009	Rock Creek, US	daily rain	10.9 mm (0.4 in)	3.5 mm (0.14 in)	66 years	20 of 100 (Routine)
29 March 2009	Rock Creek, US	daily snowfall	13.0 cm (5.1 in)	2.8 cm (1.1 in)	39 years	25 of 100 (Routine)
16 March 2009	Rock Creek, US	daily rain	19.8 mm (0.8 in)	3.3 mm (0.13 in)	84 years	20 of 100 (Routine)
8 March 2009	Rock Creek, US	daily snowfall	9.9 cm (3.9 in)	1.0 cm (0.4 in)	83 years	35 of 100 (Notable)
3 March 2009	Rock Creek, US	daily rain	9.9 mm (0.39 in)	0.2 mm (0.01 in)	18 years	14 of 100 (Routine)
5 January 2009	Rock Creek, US	daily rain	19.8 mm (0.8 in)	0.5 mm (0.02 in)	86 years	20 of 100 (Routine)

Climate Trend

14 complete years, 1928 to 1947

One stripe for each of 14 complete years at Rock Creek, 1928 to 1947. Blue stripes are years cooler than the station's own mean of 7.2 C (44.9 F); red stripes are warmer. The coolest year was 1944, at 6.3 C (43.3 F), and the warmest was 1934, at 9.4 C (49.0 F). The strongest colour marks a difference of 2.3 C (4.1 F).

Annual mean temperature at Rock Creek as warming stripes, 1928 to 1947
Year	Annual mean temperature	Difference from the station mean
1928	7.1 C	-0.12 C
1930	6.7 C	-0.45 C
1931	7.0 C	-0.19 C
1933	6.8 C	-0.41 C
1934	9.4 C	+2.23 C
1935	6.7 C	-0.48 C
1936	7.7 C	+0.47 C
1937	7.2 C	-0.04 C
1938	8.0 C	+0.80 C
1942	6.7 C	-0.49 C
1943	6.5 C	-0.67 C
1944	6.3 C	-0.90 C
1946	6.8 C	-0.40 C
1947	7.9 C	+0.66 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

1920 to 2010

Yearly extremes at Rock Creek: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	36.1 C (97.0 F)	1934	32.8 C (91.0 F)	23
Coldest night (TNn)	-27.8 C (-18.0 F)	1943	-19.4 C (-2.9 F)	23
Wettest day (Rx1day)	65.0 mm (2.6 in)	1984	26.7 mm (1.1 in)	91
Wettest five days (Rx5day)	159.2 mm (6.3 in)	1964	51.6 mm (2.0 in)	91
Longest dry spell (CDD)	83 days	1974	33 days	91

Hottest day (TXx)

The hottest day of the year at Rock Creek, 1920 to 2010. The record is 36.1 C (97.0 F) in 1934, marked on the chart; the median year is 32.8 C (91.0 F).

Hottest day (TXx) at Rock Creek by year
Year	Hottest day (TXx)
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	10.0 C (50.0 F)
1926	n/a
1927	32.2 C (90.0 F)
1928	33.3 C (91.9 F)
1929	31.7 C (89.1 F)
1930	31.1 C (88.0 F)
1931	35.6 C (96.1 F)
1932	30.6 C (87.1 F)
1933	33.9 C (93.0 F)
1934	36.1 C (97.0 F)
1935	34.4 C (93.9 F)
1936	33.3 C (91.9 F)
1937	32.2 C (90.0 F)
1938	34.4 C (93.9 F)
1939	32.8 C (91.0 F)
1940	33.3 C (91.9 F)
1941	32.8 C (91.0 F)
1942	32.2 C (90.0 F)
1943	31.1 C (88.0 F)
1944	30.6 C (87.1 F)
1945	32.2 C (90.0 F)
1946	34.4 C (93.9 F)
1947	33.9 C (93.0 F)
1948	32.2 C (90.0 F)
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	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
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a

Coldest night (TNn)

The coldest night of the year at Rock Creek, 1920 to 2010. The record is -27.8 C (-18.0 F) in 1943, marked on the chart; the median year is -19.4 C (-2.9 F).

Coldest night (TNn) at Rock Creek by year
Year	Coldest night (TNn)
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	-5.0 C (23.0 F)
1926	n/a
1927	-20.0 C (-4.0 F)
1928	-13.9 C (7.0 F)
1929	-19.4 C (-2.9 F)
1930	-23.3 C (-9.9 F)
1931	-14.4 C (6.1 F)
1932	-23.9 C (-11.0 F)
1933	-27.2 C (-17.0 F)
1934	-12.2 C (10.0 F)
1935	-23.3 C (-9.9 F)
1936	-22.2 C (-8.0 F)
1937	-25.6 C (-14.1 F)
1938	-13.3 C (8.1 F)
1939	-19.4 C (-2.9 F)
1940	-15.0 C (5.0 F)
1941	-19.4 C (-2.9 F)
1942	-19.4 C (-2.9 F)
1943	-27.8 C (-18.0 F)
1944	-13.9 C (7.0 F)
1945	-20.0 C (-4.0 F)
1946	-14.4 C (6.1 F)
1947	-20.0 C (-4.0 F)
1948	-16.1 C (3.0 F)
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	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
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a

Wettest day (Rx1day)

The wettest day of the year at Rock Creek, 1920 to 2010. The record is 65.0 mm (2.6 in) in 1984, marked on the chart; the median year is 26.7 mm (1.1 in).

Wettest day (Rx1day) at Rock Creek by year
Year	Wettest day (Rx1day)
1920	31.8 mm (1.3 in)
1921	54.6 mm (2.1 in)
1922	20.1 mm (0.8 in)
1923	19.3 mm (0.8 in)
1924	16.3 mm (0.6 in)
1925	26.9 mm (1.1 in)
1926	18.3 mm (0.7 in)
1927	16.0 mm (0.6 in)
1928	12.2 mm (0.5 in)
1929	23.6 mm (0.9 in)
1930	23.6 mm (0.9 in)
1931	27.4 mm (1.1 in)
1932	22.9 mm (0.9 in)
1933	27.9 mm (1.1 in)
1934	39.1 mm (1.5 in)
1935	23.4 mm (0.9 in)
1936	32.0 mm (1.3 in)
1937	33.0 mm (1.3 in)
1938	25.4 mm (1.0 in)
1939	16.3 mm (0.6 in)
1940	27.9 mm (1.1 in)
1941	50.3 mm (2.0 in)
1942	21.8 mm (0.9 in)
1943	23.9 mm (0.9 in)
1944	31.2 mm (1.2 in)
1945	35.6 mm (1.4 in)
1946	25.1 mm (1.0 in)
1947	59.9 mm (2.4 in)
1948	28.7 mm (1.1 in)
1949	16.5 mm (0.6 in)
1950	18.0 mm (0.7 in)
1951	16.3 mm (0.6 in)
1952	25.1 mm (1.0 in)
1953	26.9 mm (1.1 in)
1954	21.6 mm (0.9 in)
1955	33.5 mm (1.3 in)
1956	23.4 mm (0.9 in)
1957	30.5 mm (1.2 in)
1958	21.6 mm (0.9 in)
1959	28.7 mm (1.1 in)
1960	22.4 mm (0.9 in)
1961	23.4 mm (0.9 in)
1962	32.5 mm (1.3 in)
1963	20.8 mm (0.8 in)
1964	54.6 mm (2.1 in)
1965	25.9 mm (1.0 in)
1966	28.7 mm (1.1 in)
1967	29.0 mm (1.1 in)
1968	39.4 mm (1.6 in)
1969	28.7 mm (1.1 in)
1970	35.1 mm (1.4 in)
1971	23.6 mm (0.9 in)
1972	37.6 mm (1.5 in)
1973	25.4 mm (1.0 in)
1974	23.6 mm (0.9 in)
1975	21.1 mm (0.8 in)
1976	18.5 mm (0.7 in)
1977	35.6 mm (1.4 in)
1978	23.9 mm (0.9 in)
1979	35.1 mm (1.4 in)
1980	30.0 mm (1.2 in)
1981	19.3 mm (0.8 in)
1982	36.3 mm (1.4 in)
1983	21.6 mm (0.9 in)
1984	65.0 mm (2.6 in)
1985	32.0 mm (1.3 in)
1986	27.9 mm (1.1 in)
1987	18.0 mm (0.7 in)
1988	46.7 mm (1.8 in)
1989	26.7 mm (1.1 in)
1990	30.5 mm (1.2 in)
1991	30.7 mm (1.2 in)
1992	25.7 mm (1.0 in)
1993	25.4 mm (1.0 in)
1994	23.4 mm (0.9 in)
1995	42.9 mm (1.7 in)
1996	35.8 mm (1.4 in)
1997	35.1 mm (1.4 in)
1998	29.5 mm (1.2 in)
1999	31.5 mm (1.2 in)
2000	19.3 mm (0.8 in)
2001	20.3 mm (0.8 in)
2002	20.6 mm (0.8 in)
2003	22.4 mm (0.9 in)
2004	23.4 mm (0.9 in)
2005	20.3 mm (0.8 in)
2006	21.3 mm (0.8 in)
2007	35.3 mm (1.4 in)
2008	36.1 mm (1.4 in)
2009	34.3 mm (1.4 in)
2010	32.3 mm (1.3 in)

Wettest five days (Rx5day)

The wettest five days of the year at Rock Creek, 1920 to 2010. The record is 159.2 mm (6.3 in) in 1964, marked on the chart; the median year is 51.6 mm (2.0 in).

Wettest five days (Rx5day) at Rock Creek by year
Year	Wettest five days (Rx5day)
1920	36.4 mm (1.4 in)
1921	93.7 mm (3.7 in)
1922	40.2 mm (1.6 in)
1923	43.4 mm (1.7 in)
1924	44.9 mm (1.8 in)
1925	36.8 mm (1.4 in)
1926	27.9 mm (1.1 in)
1927	41.6 mm (1.6 in)
1928	30.8 mm (1.2 in)
1929	59.2 mm (2.3 in)
1930	41.9 mm (1.6 in)
1931	54.8 mm (2.2 in)
1932	53.1 mm (2.1 in)
1933	36.8 mm (1.4 in)
1934	56.9 mm (2.2 in)
1935	26.3 mm (1.0 in)
1936	47.0 mm (1.9 in)
1937	54.1 mm (2.1 in)
1938	48.8 mm (1.9 in)
1939	33.9 mm (1.3 in)
1940	68.7 mm (2.7 in)
1941	77.2 mm (3.0 in)
1942	39.8 mm (1.6 in)
1943	61.3 mm (2.4 in)
1944	49.0 mm (1.9 in)
1945	61.7 mm (2.4 in)
1946	61.0 mm (2.4 in)
1947	60.9 mm (2.4 in)
1948	60.9 mm (2.4 in)
1949	37.8 mm (1.5 in)
1950	57.4 mm (2.3 in)
1951	46.4 mm (1.8 in)
1952	36.6 mm (1.4 in)
1953	58.6 mm (2.3 in)
1954	40.2 mm (1.6 in)
1955	84.6 mm (3.3 in)
1956	56.5 mm (2.2 in)
1957	53.3 mm (2.1 in)
1958	44.2 mm (1.7 in)
1959	37.5 mm (1.5 in)
1960	43.9 mm (1.7 in)
1961	59.2 mm (2.3 in)
1962	85.6 mm (3.4 in)
1963	47.0 mm (1.9 in)
1964	159.2 mm (6.3 in)
1965	64.8 mm (2.6 in)
1966	63.6 mm (2.5 in)
1967	44.7 mm (1.8 in)
1968	56.9 mm (2.2 in)
1969	52.9 mm (2.1 in)
1970	51.6 mm (2.0 in)
1971	70.9 mm (2.8 in)
1972	47.0 mm (1.9 in)
1973	52.9 mm (2.1 in)
1974	67.3 mm (2.6 in)
1975	34.0 mm (1.3 in)
1976	44.4 mm (1.7 in)
1977	51.3 mm (2.0 in)
1978	50.8 mm (2.0 in)
1979	35.6 mm (1.4 in)
1980	75.7 mm (3.0 in)
1981	36.8 mm (1.4 in)
1982	65.3 mm (2.6 in)
1983	47.4 mm (1.9 in)
1984	74.1 mm (2.9 in)
1985	66.9 mm (2.6 in)
1986	51.6 mm (2.0 in)
1987	41.6 mm (1.6 in)
1988	58.9 mm (2.3 in)
1989	54.0 mm (2.1 in)
1990	43.8 mm (1.7 in)
1991	79.2 mm (3.1 in)
1992	43.2 mm (1.7 in)
1993	50.8 mm (2.0 in)
1994	35.1 mm (1.4 in)
1995	65.6 mm (2.6 in)
1996	64.8 mm (2.6 in)
1997	87.9 mm (3.5 in)
1998	67.7 mm (2.7 in)
1999	48.1 mm (1.9 in)
2000	38.3 mm (1.5 in)
2001	46.2 mm (1.8 in)
2002	47.5 mm (1.9 in)
2003	36.1 mm (1.4 in)
2004	43.8 mm (1.7 in)
2005	52.6 mm (2.1 in)
2006	60.4 mm (2.4 in)
2007	54.2 mm (2.1 in)
2008	86.6 mm (3.4 in)
2009	63.5 mm (2.5 in)
2010	32.6 mm (1.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at Rock Creek, 1920 to 2010. The record is 83 days in 1974, marked on the chart; the median year is 33 days.

Longest dry spell (CDD) at Rock Creek by year
Year	Longest dry spell (CDD)
1920	26 days
1921	24 days
1922	61 days
1923	33 days
1924	59 days
1925	21 days
1926	34 days
1927	27 days
1928	41 days
1929	43 days
1930	25 days
1931	59 days
1932	39 days
1933	33 days
1934	59 days
1935	34 days
1936	46 days
1937	29 days
1938	39 days
1939	50 days
1940	37 days
1941	19 days
1942	19 days
1943	36 days
1944	34 days
1945	46 days
1946	42 days
1947	35 days
1948	20 days
1949	30 days
1950	42 days
1951	28 days
1952	62 days
1953	34 days
1954	23 days
1955	46 days
1956	31 days
1957	26 days
1958	14 days
1959	43 days
1960	20 days
1961	39 days
1962	24 days
1963	23 days
1964	26 days
1965	24 days
1966	45 days
1967	34 days
1968	20 days
1969	48 days
1970	36 days
1971	22 days
1972	22 days
1973	32 days
1974	83 days
1975	20 days
1976	30 days
1977	41 days
1978	55 days
1979	37 days
1980	22 days
1981	42 days
1982	16 days
1983	31 days
1984	26 days
1985	30 days
1986	34 days
1987	78 days
1988	37 days
1989	32 days
1990	35 days
1991	36 days
1992	28 days
1993	44 days
1994	27 days
1995	27 days
1996	28 days
1997	20 days
1998	37 days
1999	73 days
2000	43 days
2001	25 days
2002	39 days
2003	18 days
2004	33 days
2005	81 days
2006	29 days
2007	25 days
2008	24 days
2009	50 days
2010	26 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

85 years, 1921 to 2009

A day with at least 26.1 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 62.5 mm (2.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Rock Creek: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	26.1 mm (1.0 in)
5 years	34.3 mm (1.4 in)
10 years	40.3 mm (1.6 in)
25 years	48.6 mm (1.9 in)
50 years	55.3 mm (2.2 in)
100 years	62.5 mm (2.5 in)	Longer than the 85 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, 85 years of values from 1921 to 2009.

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: 65.0 mm (2.6 in) in 1984; 59.9 mm (2.4 in) in 1947; 54.6 mm (2.1 in) in 1921.

Download the Data

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