Umatilla Weather Records (USC00358734)

Record envelope, standing records and threshold days for Umatilla (USC00358734), Oregon, United States, with 74 years of record.

Key Facts for Umatilla

Umatilla (USC00358734) is a weather station in Oregon, United States at 45.92 latitude and -119.35 longitude, 82 m (269 ft) above sea level.
The station reports from 1892 to 1965, 74 years of record.
1,464 records set at Umatilla still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Umatilla set a daily record low maximum temperature of 15.6 C (60.1 F) on 28 September 1965.

About the Station

Location: Oregon, United States, 45.92 latitude, -119.35 longitude.
Elevation: 82 m (269 ft).
Period of record: 1892 to 1965, 74 years.
Eligible elements: tmax, tmin, prcp, snow.

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 Umatilla. 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 Umatilla, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	19.4 C (66.9 F)	-30.6 C (-23.1 F)	n/a	n/a
Feb	25.6 C (78.1 F)	-27.2 C (-17.0 F)	n/a	n/a
Mar	30.0 C (86.0 F)	-12.2 C (10.0 F)	n/a	n/a
Apr	36.1 C (97.0 F)	-6.7 C (19.9 F)	n/a	n/a
May	40.0 C (104.0 F)	-3.3 C (26.1 F)	n/a	n/a
Jun	43.3 C (109.9 F)	0.0 C (32.0 F)	n/a	n/a
Jul	47.2 C (117.0 F)	2.2 C (36.0 F)	n/a	n/a
Aug	45.6 C (114.1 F)	5.6 C (42.1 F)	n/a	n/a
Sep	39.4 C (102.9 F)	-3.9 C (25.0 F)	n/a	n/a
Oct	31.7 C (89.1 F)	-11.1 C (12.0 F)	n/a	n/a
Nov	25.0 C (77.0 F)	-21.1 C (-6.0 F)	n/a	n/a
Dec	21.7 C (71.1 F)	-26.7 C (-16.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Umatilla still stand. 1906 holds the most, with 50.

Standing records at Umatilla by the year they were set
Year set	Standing records
1902	12
1903	18
1904	25
1905	33
1906	50
1907	23
1908	30
1909	39
1910	23
1911	24
1912	16
1913	28
1914	24
1915	25
1916	43
1917	27
1918	35
1919	43
1920	17
1921	26
1922	19
1923	12
1924	48
1925	23
1926	26
1927	23
1928	19
1929	20
1930	24
1931	32
1932	34
1933	35
1934	38
1935	27
1936	37
1937	27
1938	18
1939	13
1940	15
1941	11
1942	9
1943	16
1944	13
1945	22
1946	11
1947	13
1948	12
1949	23
1950	23
1951	13
1952	20
1953	19
1954	19
1955	29
1956	10
1957	17
1958	14
1959	15
1960	18
1961	20
1962	18
1963	11
1964	16
1965	21

All-Time Record Progression

2 new records

2 all-time records were set at Umatilla between 27 July 1939 and 2 October 1957. Each dot is a new record.

When Umatilla set new all-time records
Date	Kind	Detail
1939-07-27	Record high maximum temperature	Record high maximum temperature 47.2 C (117.0 F)
1957-10-02	Record daily precipitation	Record daily precipitation 79.5 mm (3.1 in)

Wettest Day of Each Month

Oct: 79.5 mm (3.1 in)

The wettest day on record for each calendar month at Umatilla. The most was 79.5 mm (3.1 in) on 2 October 1957.

Record daily precipitation for each month at Umatilla
Month	Record daily precipitation (mm)	Date
Jan	27.4 mm (1.1 in)	7 January 1948
Feb	18.3 mm (0.7 in)	1 February 1916
Mar	22.9 mm (0.9 in)	22 March 1910
Apr	16.5 mm (0.6 in)	26 April 1894
May	26.7 mm (1.1 in)	22 May 1914
Jun	30.5 mm (1.2 in)	28 June 1955
Jul	24.6 mm (1.0 in)	7 July 1948
Aug	21.3 mm (0.8 in)	31 August 1896
Sep	25.4 mm (1.0 in)	2 September 1946
Oct	79.5 mm (3.1 in)	2 October 1957
Nov	32.0 mm (1.3 in)	25 November 1906
Dec	23.4 mm (0.9 in)	23 December 1964

Period of Record Coverage

1902 to 1965

64 years of record at Umatilla, 1902 to 1965. 6 years have data for under 90 percent of days and are left out of rankings: 1902, 1906, 1909, 1929, 1930, 1965.

Days with data per year at Umatilla
Year	Days with data	Share of year	Complete
1902	241	66%	No
1903	360	99%	Yes
1904	361	99%	Yes
1905	361	99%	Yes
1906	261	72%	No
1907	331	91%	Yes
1908	331	90%	Yes
1909	299	82%	No
1910	359	98%	Yes
1911	361	99%	Yes
1912	352	96%	Yes
1913	362	99%	Yes
1914	360	99%	Yes
1915	364	100%	Yes
1916	362	99%	Yes
1917	364	100%	Yes
1918	363	99%	Yes
1919	363	99%	Yes
1920	366	100%	Yes
1921	365	100%	Yes
1922	365	100%	Yes
1923	364	100%	Yes
1924	365	100%	Yes
1925	362	99%	Yes
1926	360	99%	Yes
1927	348	95%	Yes
1928	335	92%	Yes
1929	211	58%	No
1930	300	82%	No
1931	364	100%	Yes
1932	365	100%	Yes
1933	360	99%	Yes
1934	332	91%	Yes
1935	358	98%	Yes
1936	365	100%	Yes
1937	358	98%	Yes
1938	363	99%	Yes
1939	364	100%	Yes
1940	364	99%	Yes
1941	364	100%	Yes
1942	362	99%	Yes
1943	361	99%	Yes
1944	366	100%	Yes
1945	362	99%	Yes
1946	362	99%	Yes
1947	335	92%	Yes
1948	362	99%	Yes
1949	364	100%	Yes
1950	364	100%	Yes
1951	364	100%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	364	100%	Yes
1956	365	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	364	100%	Yes
1960	366	100%	Yes
1961	364	100%	Yes
1962	363	99%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	293	80%	No

Latest Records

Latest records at Umatilla
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
28 September 1965	Umatilla, US	daily low max	15.6 C (60.1 F)	0.5 C (0.9 F)	35 years	17 of 100 (Routine)
19 September 1965	Umatilla, US	daily low min	0.0 C (32.0 F)	1.1 C (2.0 F)	8 years	11 of 100 (Routine)
18 September 1965	Umatilla, US	daily low min	-0.6 C (30.9 F)	2.8 C (5.0 F)	23 years	19 of 100 (Routine)
18 September 1965	Umatilla, US	daily low max	16.7 C (62.1 F)	1.6 C (2.9 F)	24 years	16 of 100 (Routine)
17 September 1965	Umatilla, US	daily low min	-0.6 C (30.9 F)	3.4 C (6.1 F)	63 years	33 of 100 (Routine)
17 September 1965	Umatilla, US	daily low max	16.1 C (61.0 F)	2.2 C (4.0 F)	55 years	26 of 100 (Routine)
30 August 1965	Umatilla, US	daily low min (Tie)	6.1 C (43.0 F)	tie	55 years	5 of 100 (Routine)
21 August 1965	Umatilla, US	daily rain	20.1 mm (0.8 in)	17.3 mm (0.7 in)	6 years	20 of 100 (Routine)
20 August 1965	Umatilla, US	daily low max	21.1 C (70.0 F)	1.7 C (3.1 F)	6 years	10 of 100 (Routine)
22 July 1965	Umatilla, US	daily low max	22.2 C (72.0 F)	3.4 C (6.1 F)	11 years	16 of 100 (Routine)
21 July 1965	Umatilla, US	daily rain	0.5 mm (0.02 in)	0.2 mm (0.01 in)	44 years	20 of 100 (Routine)
21 July 1965	Umatilla, US	daily low max (Tie)	23.3 C (73.9 F)	tie	31 years	3 of 100 (Routine)
20 July 1965	Umatilla, US	daily rain	4.1 mm (0.16 in)	2.6 mm (0.10 in)	52 years	20 of 100 (Routine)
18 June 1965	Umatilla, US	daily rain	13.2 mm (0.5 in)	1.8 mm (0.07 in)	27 years	18 of 100 (Routine)
17 June 1965	Umatilla, US	daily rain	6.4 mm (0.25 in)	3.4 mm (0.13 in)	26 years	20 of 100 (Routine)
15 June 1965	Umatilla, US	daily low max	17.8 C (64.0 F)	1.1 C (2.0 F)	15 years	12 of 100 (Routine)
20 April 1965	Umatilla, US	daily high min (Tie)	10.6 C (51.1 F)	tie	55 years	5 of 100 (Routine)
24 March 1965	Umatilla, US	daily low min	-9.4 C (15.1 F)	5.0 C (9.0 F)	23 years	25 of 100 (Routine)
20 March 1965	Umatilla, US	daily low min	-7.8 C (18.0 F)	3.4 C (6.1 F)	62 years	33 of 100 (Routine)
19 March 1965	Umatilla, US	daily low max	6.7 C (44.1 F)	1.1 C (2.0 F)	52 years	23 of 100 (Routine)

Climate Trend

52 complete years, 1903 to 1964

One stripe for each of 52 complete years at Umatilla, 1903 to 1964. Blue stripes are years cooler than the station's own mean of 12.1 C (53.8 F); red stripes are warmer. The coolest year was 1916, at 9.8 C (49.6 F), and the warmest was 1925, at 13.9 C (56.9 F). The strongest colour marks a difference of 2.4 C (4.3 F).

Annual mean temperature at Umatilla as warming stripes, 1903 to 1964
Year	Annual mean temperature	Difference from the station mean
1903	12.3 C	+0.23 C
1904	13.2 C	+1.13 C
1905	12.8 C	+0.70 C
1910	12.7 C	+0.63 C
1911	12.2 C	+0.12 C
1912	12.1 C	-0.02 C
1913	12.0 C	-0.07 C
1914	13.1 C	+1.00 C
1915	13.7 C	+1.64 C
1916	9.8 C	-2.32 C
1917	13.0 C	+0.90 C
1918	13.5 C	+1.45 C
1919	11.9 C	-0.22 C
1920	12.3 C	+0.17 C
1921	12.4 C	+0.31 C
1922	11.3 C	-0.75 C
1923	12.7 C	+0.64 C
1924	12.5 C	+0.45 C
1925	13.9 C	+1.76 C
1926	13.5 C	+1.37 C
1927	12.1 C	+0.04 C
1931	12.6 C	+0.50 C
1932	12.0 C	-0.13 C
1933	12.7 C	+0.58 C
1935	11.6 C	-0.49 C
1936	11.8 C	-0.33 C
1937	11.6 C	-0.46 C
1938	12.7 C	+0.58 C
1939	13.0 C	+0.92 C
1941	12.6 C	+0.50 C
1942	11.6 C	-0.50 C
1943	10.7 C	-1.44 C
1944	11.6 C	-0.54 C
1945	11.9 C	-0.19 C
1946	11.5 C	-0.58 C
1948	10.6 C	-1.45 C
1949	11.0 C	-1.05 C
1950	10.7 C	-1.36 C
1951	11.6 C	-0.53 C
1952	11.8 C	-0.31 C
1953	13.0 C	+0.87 C
1954	11.2 C	-0.94 C
1955	10.8 C	-1.26 C
1956	11.7 C	-0.35 C
1957	11.2 C	-0.88 C
1958	13.2 C	+1.13 C
1959	11.7 C	-0.39 C
1960	11.7 C	-0.43 C
1961	12.7 C	+0.61 C
1962	11.9 C	-0.15 C
1963	11.9 C	-0.21 C
1964	11.3 C	-0.81 C

The annual mean temperature here has fallen by 0.2 C (0.1 to 0.3) per decade over 1903 to 1964. In Fahrenheit: 0.3 F (0.1 to 0.6) per decade. The slope is a straight line fitted to 52 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Umatilla
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	-0.2 C (-0.3 to -0.1) per decade	-0.3 F (-0.6 to -0.1) per decade	1903 to 1964	52	Fall
Mean daily maximum	-0.18 C (-0.33 to -0.02) per decade	-0.32 F (-0.60 to -0.03) per decade	1903 to 1964	52	Fall
Mean daily minimum	-0.2 C (-0.3 to -0.1) per decade	-0.4 F (-0.6 to -0.2) per decade	1903 to 1964	52	Fall

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

1892 to 1965

Yearly extremes at Umatilla: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	47.2 C (117.0 F)	1939	41.4 C (106.5 F)	64
Coldest night (TNn)	-30.6 C (-23.1 F)	1909	-16.4 C (2.5 F)	64
Wettest day (Rx1day)	79.5 mm (3.1 in)	1957	16.8 mm (0.7 in)	74
Wettest five days (Rx5day)	95.5 mm (3.8 in)	1957	26.1 mm (1.0 in)	74
Longest dry spell (CDD)	120 days	1932	58 days	74

Hottest day (TXx)

The hottest day of the year at Umatilla, 1892 to 1965. The record is 47.2 C (117.0 F) in 1939, marked on the chart; the median year is 41.4 C (106.5 F).

Hottest day (TXx) at Umatilla by year
Year	Hottest day (TXx)
1892	n/a
1893	n/a
1894	n/a
1895	n/a
1896	n/a
1897	n/a
1898	n/a
1899	n/a
1900	n/a
1901	n/a
1902	41.1 C (106.0 F)
1903	42.2 C (108.0 F)
1904	41.1 C (106.0 F)
1905	46.1 C (115.0 F)
1906	46.1 C (115.0 F)
1907	40.6 C (105.1 F)
1908	42.2 C (108.0 F)
1909	39.4 C (102.9 F)
1910	39.4 C (102.9 F)
1911	42.8 C (109.0 F)
1912	39.4 C (102.9 F)
1913	40.6 C (105.1 F)
1914	43.9 C (111.0 F)
1915	42.8 C (109.0 F)
1916	38.9 C (102.0 F)
1917	45.6 C (114.1 F)
1918	43.3 C (109.9 F)
1919	44.4 C (111.9 F)
1920	43.3 C (109.9 F)
1921	39.4 C (102.9 F)
1922	45.6 C (114.1 F)
1923	41.7 C (107.1 F)
1924	43.3 C (109.9 F)
1925	42.2 C (108.0 F)
1926	45.0 C (113.0 F)
1927	40.6 C (105.1 F)
1928	45.6 C (114.1 F)
1929	42.2 C (108.0 F)
1930	42.8 C (109.0 F)
1931	46.1 C (115.0 F)
1932	41.1 C (106.0 F)
1933	41.7 C (107.1 F)
1934	42.8 C (109.0 F)
1935	43.3 C (109.9 F)
1936	42.2 C (108.0 F)
1937	41.1 C (106.0 F)
1938	44.4 C (111.9 F)
1939	47.2 C (117.0 F)
1940	41.1 C (106.0 F)
1941	43.9 C (111.0 F)
1942	41.7 C (107.1 F)
1943	38.3 C (100.9 F)
1944	40.0 C (104.0 F)
1945	38.9 C (102.0 F)
1946	40.6 C (105.1 F)
1947	37.8 C (100.0 F)
1948	39.4 C (102.9 F)
1949	38.3 C (100.9 F)
1950	38.3 C (100.9 F)
1951	40.0 C (104.0 F)
1952	40.6 C (105.1 F)
1953	40.0 C (104.0 F)
1954	36.7 C (98.1 F)
1955	40.6 C (105.1 F)
1956	40.6 C (105.1 F)
1957	35.0 C (95.0 F)
1958	41.1 C (106.0 F)
1959	42.2 C (108.0 F)
1960	43.3 C (109.9 F)
1961	45.6 C (114.1 F)
1962	41.7 C (107.1 F)
1963	38.3 C (100.9 F)
1964	40.0 C (104.0 F)
1965	40.6 C (105.1 F)

Coldest night (TNn)

The coldest night of the year at Umatilla, 1892 to 1965. The record is -30.6 C (-23.1 F) in 1909, marked on the chart; the median year is -16.4 C (2.5 F).

Coldest night (TNn) at Umatilla by year
Year	Coldest night (TNn)
1892	n/a
1893	n/a
1894	n/a
1895	n/a
1896	n/a
1897	n/a
1898	n/a
1899	n/a
1900	n/a
1901	n/a
1902	-3.9 C (25.0 F)
1903	-10.0 C (14.0 F)
1904	-9.4 C (15.1 F)
1905	-13.3 C (8.1 F)
1906	-11.7 C (10.9 F)
1907	-20.6 C (-5.1 F)
1908	-15.0 C (5.0 F)
1909	-30.6 C (-23.1 F)
1910	-13.9 C (7.0 F)
1911	-14.4 C (6.1 F)
1912	-22.8 C (-9.0 F)
1913	-16.7 C (1.9 F)
1914	-15.6 C (3.9 F)
1915	-11.7 C (10.9 F)
1916	-27.8 C (-18.0 F)
1917	-13.3 C (8.1 F)
1918	-13.9 C (7.0 F)
1919	-26.7 C (-16.1 F)
1920	-9.4 C (15.1 F)
1921	-12.2 C (10.0 F)
1922	-26.1 C (-15.0 F)
1923	-17.8 C (0.0 F)
1924	-22.8 C (-9.0 F)
1925	-6.1 C (21.0 F)
1926	-18.3 C (-0.9 F)
1927	-26.1 C (-15.0 F)
1928	-13.9 C (7.0 F)
1929	-6.1 C (21.0 F)
1930	-6.7 C (19.9 F)
1931	-13.3 C (8.1 F)
1932	-22.8 C (-9.0 F)
1933	-23.3 C (-9.9 F)
1934	-3.3 C (26.1 F)
1935	-17.8 C (0.0 F)
1936	-23.3 C (-9.9 F)
1937	-25.6 C (-14.1 F)
1938	-11.7 C (10.9 F)
1939	-12.8 C (9.0 F)
1940	-11.1 C (12.0 F)
1941	-7.8 C (18.0 F)
1942	-20.0 C (-4.0 F)
1943	-21.1 C (-6.0 F)
1944	-10.6 C (12.9 F)
1945	-16.1 C (3.0 F)
1946	-11.7 C (10.9 F)
1947	-21.1 C (-6.0 F)
1948	-17.8 C (0.0 F)
1949	-23.3 C (-9.9 F)
1950	-27.2 C (-17.0 F)
1951	-16.7 C (1.9 F)
1952	-16.7 C (1.9 F)
1953	-5.0 C (23.0 F)
1954	-20.6 C (-5.1 F)
1955	-21.1 C (-6.0 F)
1956	-21.1 C (-6.0 F)
1957	-30.0 C (-22.0 F)
1958	-10.0 C (14.0 F)
1959	-17.8 C (0.0 F)
1960	-12.8 C (9.0 F)
1961	-13.9 C (7.0 F)
1962	-20.0 C (-4.0 F)
1963	-19.4 C (-2.9 F)
1964	-21.7 C (-7.1 F)
1965	-9.4 C (15.1 F)

Wettest day (Rx1day)

The wettest day of the year at Umatilla, 1892 to 1965. The record is 79.5 mm (3.1 in) in 1957, marked on the chart; the median year is 16.8 mm (0.7 in).

Wettest day (Rx1day) at Umatilla by year
Year	Wettest day (Rx1day)
1892	17.0 mm (0.7 in)
1893	22.6 mm (0.9 in)
1894	22.6 mm (0.9 in)
1895	17.8 mm (0.7 in)
1896	21.8 mm (0.9 in)
1897	14.7 mm (0.6 in)
1898	8.4 mm (0.33 in)
1899	14.0 mm (0.6 in)
1900	14.0 mm (0.6 in)
1901	12.7 mm (0.5 in)
1902	15.2 mm (0.6 in)
1903	14.0 mm (0.6 in)
1904	11.4 mm (0.4 in)
1905	12.2 mm (0.5 in)
1906	32.0 mm (1.3 in)
1907	19.1 mm (0.8 in)
1908	12.4 mm (0.5 in)
1909	20.3 mm (0.8 in)
1910	22.9 mm (0.9 in)
1911	24.6 mm (1.0 in)
1912	20.3 mm (0.8 in)
1913	16.5 mm (0.6 in)
1914	26.7 mm (1.1 in)
1915	16.0 mm (0.6 in)
1916	19.3 mm (0.8 in)
1917	15.2 mm (0.6 in)
1918	21.3 mm (0.8 in)
1919	19.1 mm (0.8 in)
1920	19.3 mm (0.8 in)
1921	28.4 mm (1.1 in)
1922	10.9 mm (0.4 in)
1923	20.6 mm (0.8 in)
1924	10.7 mm (0.4 in)
1925	20.3 mm (0.8 in)
1926	17.8 mm (0.7 in)
1927	13.5 mm (0.5 in)
1928	12.7 mm (0.5 in)
1929	6.1 mm (0.24 in)
1930	14.5 mm (0.6 in)
1931	19.3 mm (0.8 in)
1932	13.2 mm (0.5 in)
1933	15.2 mm (0.6 in)
1934	7.9 mm (0.31 in)
1935	10.7 mm (0.4 in)
1936	14.7 mm (0.6 in)
1937	15.7 mm (0.6 in)
1938	12.7 mm (0.5 in)
1939	11.7 mm (0.5 in)
1940	10.9 mm (0.4 in)
1941	18.5 mm (0.7 in)
1942	20.1 mm (0.8 in)
1943	17.8 mm (0.7 in)
1944	18.3 mm (0.7 in)
1945	20.8 mm (0.8 in)
1946	25.4 mm (1.0 in)
1947	11.9 mm (0.5 in)
1948	27.4 mm (1.1 in)
1949	13.2 mm (0.5 in)
1950	25.7 mm (1.0 in)
1951	15.2 mm (0.6 in)
1952	13.2 mm (0.5 in)
1953	26.7 mm (1.1 in)
1954	13.7 mm (0.5 in)
1955	30.5 mm (1.2 in)
1956	17.3 mm (0.7 in)
1957	79.5 mm (3.1 in)
1958	16.5 mm (0.6 in)
1959	16.5 mm (0.6 in)
1960	13.2 mm (0.5 in)
1961	20.1 mm (0.8 in)
1962	18.8 mm (0.7 in)
1963	12.7 mm (0.5 in)
1964	23.4 mm (0.9 in)
1965	20.1 mm (0.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Umatilla, 1892 to 1965. The record is 95.5 mm (3.8 in) in 1957, marked on the chart; the median year is 26.1 mm (1.0 in).

Wettest five days (Rx5day) at Umatilla by year
Year	Wettest five days (Rx5day)
1892	31.5 mm (1.2 in)
1893	34.4 mm (1.4 in)
1894	25.1 mm (1.0 in)
1895	17.3 mm (0.7 in)
1896	23.8 mm (0.9 in)
1897	17.8 mm (0.7 in)
1898	15.8 mm (0.6 in)
1899	41.9 mm (1.6 in)
1900	16.0 mm (0.6 in)
1901	18.0 mm (0.7 in)
1902	29.0 mm (1.1 in)
1903	24.5 mm (1.0 in)
1904	15.7 mm (0.6 in)
1905	17.8 mm (0.7 in)
1906	13.9 mm (0.5 in)
1907	31.4 mm (1.2 in)
1908	16.2 mm (0.6 in)
1909	32.7 mm (1.3 in)
1910	25.4 mm (1.0 in)
1911	31.0 mm (1.2 in)
1912	27.9 mm (1.1 in)
1913	17.8 mm (0.7 in)
1914	30.7 mm (1.2 in)
1915	23.4 mm (0.9 in)
1916	45.8 mm (1.8 in)
1917	22.8 mm (0.9 in)
1918	23.3 mm (0.9 in)
1919	28.0 mm (1.1 in)
1920	31.8 mm (1.3 in)
1921	47.2 mm (1.9 in)
1922	17.3 mm (0.7 in)
1923	30.0 mm (1.2 in)
1924	20.9 mm (0.8 in)
1925	23.4 mm (0.9 in)
1926	27.9 mm (1.1 in)
1927	28.8 mm (1.1 in)
1928	14.5 mm (0.6 in)
1929	6.6 mm (0.26 in)
1930	23.6 mm (0.9 in)
1931	28.2 mm (1.1 in)
1932	16.5 mm (0.6 in)
1933	26.2 mm (1.0 in)
1934	11.0 mm (0.4 in)
1935	21.6 mm (0.9 in)
1936	20.6 mm (0.8 in)
1937	28.4 mm (1.1 in)
1938	19.0 mm (0.7 in)
1939	16.5 mm (0.6 in)
1940	27.9 mm (1.1 in)
1941	25.2 mm (1.0 in)
1942	33.3 mm (1.3 in)
1943	27.0 mm (1.1 in)
1944	18.3 mm (0.7 in)
1945	33.5 mm (1.3 in)
1946	27.7 mm (1.1 in)
1947	19.1 mm (0.8 in)
1948	40.6 mm (1.6 in)
1949	20.1 mm (0.8 in)
1950	30.0 mm (1.2 in)
1951	46.4 mm (1.8 in)
1952	17.6 mm (0.7 in)
1953	34.7 mm (1.4 in)
1954	19.3 mm (0.8 in)
1955	30.8 mm (1.2 in)
1956	29.2 mm (1.1 in)
1957	95.5 mm (3.8 in)
1958	28.2 mm (1.1 in)
1959	26.6 mm (1.0 in)
1960	16.2 mm (0.6 in)
1961	32.9 mm (1.3 in)
1962	37.1 mm (1.5 in)
1963	25.9 mm (1.0 in)
1964	86.5 mm (3.4 in)
1965	26.7 mm (1.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Umatilla, 1892 to 1965. The record is 120 days in 1932, marked on the chart; the median year is 58 days.

Longest dry spell (CDD) at Umatilla by year
Year	Longest dry spell (CDD)
1892	18 days
1893	63 days
1894	81 days
1895	28 days
1896	42 days
1897	65 days
1898	69 days
1899	67 days
1900	57 days
1901	53 days
1902	88 days
1903	60 days
1904	55 days
1905	76 days
1906	42 days
1907	47 days
1908	29 days
1909	53 days
1910	75 days
1911	35 days
1912	45 days
1913	29 days
1914	83 days
1915	43 days
1916	54 days
1917	99 days
1918	45 days
1919	111 days
1920	71 days
1921	45 days
1922	62 days
1923	36 days
1924	77 days
1925	87 days
1926	70 days
1927	66 days
1928	52 days
1929	103 days
1930	67 days
1931	99 days
1932	120 days
1933	91 days
1934	56 days
1935	51 days
1936	90 days
1937	38 days
1938	60 days
1939	58 days
1940	76 days
1941	39 days
1942	46 days
1943	43 days
1944	71 days
1945	89 days
1946	64 days
1947	30 days
1948	81 days
1949	117 days
1950	99 days
1951	53 days
1952	64 days
1953	71 days
1954	40 days
1955	48 days
1956	38 days
1957	65 days
1958	75 days
1959	45 days
1960	46 days
1961	39 days
1962	40 days
1963	48 days
1964	42 days
1965	31 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

52 years with a frost

Across 52 years with a frost, the median last spring frost at Umatilla falls on 15 April and the median first autumn frost on 19 October, which leaves a median of 191 days between them.

Fitted over all years, the growing season changes by -0.2 days per decade at this station.

Frost dates and growing season at Umatilla
Measure	Median, all years	Earliest period	Recent period (1932 to 1964)	Recent against earliest	Fitted trend
Last spring frost	15 April	n/a	14 April	n/a	0.0 days per decade
First autumn frost	19 October	n/a	20 October	n/a	-0.1 days per decade
Growing days	191 days	n/a	191 days	n/a	-0.2 days per decade

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.

Rainfall Return Levels

62 years, 1894 to 1964

A day with at least 16.3 mm (0.6 in) of rain is expected about once in 2 years. A day with at least 49.0 mm (1.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Umatilla: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	16.3 mm (0.6 in)
5 years	22.4 mm (0.9 in)
10 years	27.3 mm (1.1 in)
25 years	34.8 mm (1.4 in)
50 years	41.4 mm (1.6 in)
100 years	49.0 mm (1.9 in)	Longer than the 62 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, 62 years of values from 1894 to 1964.

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: 79.5 mm (3.1 in) in 1957; 30.5 mm (1.2 in) in 1955; 28.4 mm (1.1 in) in 1921.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Download the Data

Data for Umatilla standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Umatilla 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). Records are computed by this site and are not official.

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