Expedition Pass Reservoir Threshold Days by Year (ASN00088024)

3 fixed thresholds counted per year at Expedition Pass Reservoir (ASN00088024): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Expedition Pass Reservoir Thresholds

Expedition Pass Reservoir: days with 10 mm (0.39 in) or more of precipitation in 65 years, most in 1894 with 30.
Expedition Pass Reservoir: days with 25 mm (0.98 in) or more of precipitation in 60 years, most in 1913 with 8.
Expedition Pass Reservoir: days with 50 mm (1.97 in) or more of precipitation in 25 years, most in 1950 with 3.
3 fixed thresholds have at least one qualifying day at Expedition Pass Reservoir.

Days with 10 mm (0.39 in) or more of precipitation

65 years with a qualifying day

Days per year at Expedition Pass Reservoir with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 30 in 1894.

Days with 10 mm (0.39 in) or more of precipitation per year at Expedition Pass Reservoir
Year	Days	Decade average
1873	15	18.3
1874	22	18.3
1875	21	18.3
1876	15	18.3
1893	20	16.7
1894	30	16.7
1895	13	16.7
1896	10	16.7
1897	14	16.7
1898	14	16.7
1899	16	16.7
1900	16	16.4
1901	11	16.4
1902	11	16.4
1903	22	16.4
1904	18	16.4
1905	14	16.4
1906	26	16.4
1907	14	16.4
1908	13	16.4
1909	19	16.4
1910	25	19.6
1911	20	19.6
1912	20	19.6
1913	15	19.6
1914	9	19.6
1915	17	19.6
1916	25	19.6
1917	28	19.6
1918	20	19.6
1919	17	19.6
1920	23	16
1921	22	16
1922	10	16
1923	18	16
1924	24	16
1925	9	16
1926	13	16
1927	10	16
1928	19	16
1929	12	16
1930	22	19.1
1931	21	19.1
1932	20	19.1
1933	27	19.1
1934	19	19.1
1935	20	19.1
1936	19	19.1
1938	5	19.1
1939	19	19.1
1940	12	14.8
1941	18	14.8
1942	16	14.8
1944	7	14.8
1945	13	14.8
1946	15	14.8
1947	21	14.8
1948	14	14.8
1949	17	14.8
1950	22	20.7
1951	21	20.7
1952	21	20.7
1953	16	20.7
1954	22	20.7
1955	22	20.7

For each year, a bar from the first to the last day at Expedition Pass Reservoir meeting 10 mm (0.39 in).

First to last qualifying date each year at Expedition Pass Reservoir
Year	First date	Last date
1873	1873-01-06	1873-11-14
1874	1874-01-12	1874-11-15
1875	1875-02-04	1875-12-13
1876	1876-01-19	1876-11-22
1893	1893-03-31	1893-11-20
1894	1894-03-21	1894-12-15
1895	1895-01-04	1895-12-16
1896	1896-03-15	1896-12-29
1897	1897-01-09	1897-11-02
1898	1898-02-12	1898-11-22
1899	1899-02-26	1899-10-16
1900	1900-01-04	1900-11-18
1901	1901-04-22	1901-11-05
1902	1902-02-25	1902-12-20
1903	1903-03-05	1903-12-29
1904	1904-01-03	1904-11-02
1905	1905-02-12	1905-12-31
1906	1906-02-28	1906-12-18
1907	1907-01-26	1907-12-28
1908	1908-03-09	1908-11-22
1909	1909-01-04	1909-12-01
1910	1910-03-06	1910-12-10
1911	1911-02-05	1911-12-12
1912	1912-02-08	1912-12-08
1913	1913-02-15	1913-12-31
1914	1914-03-28	1914-12-26
1915	1915-02-20	1915-10-23
1916	1916-01-28	1916-12-09
1917	1917-01-23	1917-12-31
1918	1918-01-15	1918-10-30
1919	1919-02-18	1919-12-28
1920	1920-04-03	1920-12-17
1921	1921-01-02	1921-11-15
1922	1922-02-20	1922-11-06
1923	1923-05-08	1923-12-16
1924	1924-01-03	1924-12-26
1925	1925-01-13	1925-09-13
1926	1926-01-08	1926-12-17
1927	1927-01-17	1927-09-01
1928	1928-01-18	1928-12-15
1929	1929-01-31	1929-12-28
1930	1930-02-21	1930-12-25
1931	1931-03-14	1931-11-16
1932	1932-02-10	1932-12-16
1933	1933-01-21	1933-12-26
1934	1934-01-07	1934-11-29
1935	1935-01-05	1935-12-25
1936	1936-01-10	1936-12-17
1938	1938-01-15	1938-07-30
1939	1939-01-15	1939-11-16
1940	1940-01-06	1940-12-28
1941	1941-01-04	1941-11-04
1942	1942-01-20	1942-11-23
1944	1944-03-10	1944-11-07
1945	1945-02-21	1945-11-17
1946	1946-01-17	1946-10-14
1947	1947-02-04	1947-12-23
1948	1948-02-16	1948-12-26
1949	1949-01-30	1949-11-21
1950	1950-02-01	1950-12-20
1951	1951-01-07	1951-12-10
1952	1952-01-05	1952-12-11
1953	1953-01-15	1953-12-06
1954	1954-01-29	1954-12-12
1955	1955-01-29	1955-12-23

Every Fixed Threshold

Fixed thresholds at Expedition Pass Reservoir
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
10 mm (0.39 in): Days with 10 mm or more rain	65	30	1894	22
25 mm (0.98 in): Days with 25 mm or more rain	60	8	1913	6
50 mm (1.97 in): Days with 50 mm or more rain	25	3	1950	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1873.

Download the Data

Data for Expedition Pass Reservoir 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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Expedition Pass Reservoir Threshold Days by Year (ASN00088024)

Key Facts for Expedition Pass Reservoir Thresholds

Days with 10 mm (0.39 in) or more of precipitation

Every Fixed Threshold

Download the Data

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