Record envelope, standing records and threshold days for Hermiston 1 SE (USC00353847), Oregon, United States, with 93 years of record.
Key Facts for Hermiston 1 SE
Hermiston 1 SE (USC00353847) is a weather station in Oregon, United States at 45.83 latitude and -119.26 longitude, 195 m (640 ft) above sea level.
The station reports from 1906 to 1998, 93 years of record.
1,464 records set at Hermiston 1 SE still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Hermiston 1 SE set a daily record precipitation of 8.9 mm (0.35 in) on 17 January 1998.
About the Station
Location: Oregon, United States, 45.83 latitude, -119.26 longitude.
Elevation: 195 m (640 ft).
Period of record: 1906 to 1998, 93 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 days at or beyond a record
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Hermiston 1 SE. 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 Hermiston 1 SE, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
20.6 C (69.1 F)
-35.0 C (-31.0 F)
n/a
n/a
Feb
23.9 C (75.0 F)
-33.9 C (-29.0 F)
n/a
n/a
Mar
28.9 C (84.0 F)
-14.4 C (6.1 F)
n/a
n/a
Apr
35.6 C (96.1 F)
-10.0 C (14.0 F)
n/a
n/a
May
38.9 C (102.0 F)
-5.6 C (21.9 F)
n/a
n/a
Jun
42.2 C (108.0 F)
0.6 C (33.1 F)
n/a
n/a
Jul
44.4 C (111.9 F)
3.3 C (37.9 F)
n/a
n/a
Aug
45.0 C (113.0 F)
1.7 C (35.1 F)
n/a
n/a
Sep
38.9 C (102.0 F)
-6.1 C (21.0 F)
n/a
n/a
Oct
33.3 C (91.9 F)
-14.4 C (6.1 F)
n/a
n/a
Nov
26.1 C (79.0 F)
-24.4 C (-11.9 F)
n/a
n/a
Dec
21.1 C (70.0 F)
-36.7 C (-34.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Hermiston 1 SE still stand. 1916 holds the most, with 35.
Standing records at Hermiston 1 SE by the year they were set
Year set
Standing records
1907
11
1908
21
1909
24
1910
25
1911
24
1912
13
1913
18
1914
13
1915
12
1916
35
1917
31
1918
26
1919
33
1920
11
1921
13
1922
8
1923
8
1924
34
1925
19
1926
24
1927
8
1928
16
1929
26
1930
25
1931
13
1932
23
1933
27
1934
31
1935
27
1936
34
1937
25
1938
12
1939
16
1940
14
1941
11
1942
10
1943
6
1944
13
1945
17
1946
10
1947
13
1948
19
1949
17
1950
31
1951
9
1952
18
1953
9
1954
9
1955
25
1956
16
1957
12
1958
21
1959
13
1960
20
1961
17
1962
11
1963
8
1964
12
1965
21
1966
12
1967
22
1968
18
1969
11
1970
11
1971
19
1972
23
1973
10
1974
10
1975
11
1976
8
1977
11
1978
10
1979
9
1980
11
1981
6
1982
11
1983
21
1984
5
1985
24
1986
16
1987
14
1988
8
1989
15
1990
15
1991
1
1992
15
1993
18
1994
13
1995
12
1996
3
1997
3
All-Time Record Progression
4 new records
4 all-time records were set at Hermiston 1 SE between 27 July 1939 and 5 August 1961. Each dot is a new record.
When Hermiston 1 SE set new all-time records
Date
Kind
Detail
1939-07-27
Record high maximum temperature
Record high maximum temperature 44.4 C (111.9 F)
1946-09-01
Record daily precipitation
Record daily precipitation 36.6 mm (1.4 in)
1957-10-02
Record daily precipitation
Record daily precipitation 85.3 mm (3.4 in)
1961-08-05
Record high maximum temperature
Record high maximum temperature 45.0 C (113.0 F)
Wettest Day of Each Month
Oct: 85.3 mm (3.4 in)
The wettest day on record for each calendar month at Hermiston 1 SE. The most was 85.3 mm (3.4 in) on 2 October 1957.
Record daily precipitation for each month at Hermiston 1 SE
Month
Record daily precipitation (mm)
Date
Jan
25.7 mm (1.0 in)
7 January 1948
Feb
22.9 mm (0.9 in)
6 February 1938
Mar
19.6 mm (0.8 in)
22 March 1910
Apr
31.0 mm (1.2 in)
21 April 1988
May
25.4 mm (1.0 in)
25 May 1981
Jun
21.3 mm (0.8 in)
8 June 1969
Jul
21.8 mm (0.9 in)
21 July 1973
Aug
39.9 mm (1.6 in)
14 August 1979
Sep
36.6 mm (1.4 in)
1 September 1946
Oct
85.3 mm (3.4 in)
2 October 1957
Nov
36.3 mm (1.4 in)
20 November 1921
Dec
22.4 mm (0.9 in)
11 December 1958
Period of Record Coverage
1907 to 1998
Complete yearUnder 90 percent of days
92 years of record at Hermiston 1 SE, 1907 to 1998. 6 years have data for under 90 percent of days and are left out of rankings: 1907, 1991, 1992, 1996, 1997, 1998.
Cooler than the station meanWarmer than the station mean
One stripe for each of 82 complete years at Hermiston 1 SE, 1908 to 1995. Blue stripes are years cooler than the station's own mean of 11.5 C (52.7 F); red stripes are warmer. The coolest year was 1916, at 9.4 C (48.8 F), and the warmest was 1934, at 13.3 C (56.0 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Hermiston 1 SE as warming stripes, 1908 to 1995
Year
Annual mean temperature
Difference from the station mean
1908
12.1 C
+0.67 C
1909
10.9 C
-0.56 C
1910
12.1 C
+0.60 C
1911
11.5 C
+0.04 C
1913
10.9 C
-0.54 C
1914
11.8 C
+0.37 C
1915
12.3 C
+0.86 C
1916
9.4 C
-2.11 C
1917
11.3 C
-0.21 C
1918
11.9 C
+0.42 C
1919
10.4 C
-1.04 C
1920
10.9 C
-0.62 C
1921
11.2 C
-0.24 C
1922
10.2 C
-1.28 C
1923
11.5 C
-0.02 C
1924
11.4 C
-0.04 C
1925
12.8 C
+1.35 C
1926
12.5 C
+1.00 C
1927
11.1 C
-0.34 C
1928
11.4 C
-0.07 C
1929
10.2 C
-1.25 C
1930
10.9 C
-0.58 C
1931
11.3 C
-0.15 C
1932
11.0 C
-0.43 C
1933
11.5 C
0.00 C
1934
13.3 C
+1.85 C
1935
11.2 C
-0.23 C
1936
11.5 C
+0.06 C
1937
11.3 C
-0.22 C
1938
12.4 C
+0.94 C
1939
12.6 C
+1.17 C
1940
12.5 C
+1.04 C
1941
12.3 C
+0.80 C
1942
12.0 C
+0.50 C
1943
11.4 C
-0.09 C
1946
12.0 C
+0.54 C
1947
12.6 C
+1.08 C
1948
10.7 C
-0.81 C
1949
11.1 C
-0.37 C
1950
10.6 C
-0.90 C
1951
11.6 C
+0.12 C
1952
11.6 C
+0.14 C
1953
12.6 C
+1.10 C
1954
10.8 C
-0.66 C
1955
10.4 C
-1.05 C
1956
11.2 C
-0.27 C
1957
11.1 C
-0.33 C
1958
13.1 C
+1.64 C
1959
11.4 C
-0.12 C
1960
11.2 C
-0.27 C
1961
11.9 C
+0.46 C
1962
11.4 C
-0.12 C
1963
11.3 C
-0.16 C
1964
10.8 C
-0.72 C
1965
11.8 C
+0.28 C
1966
12.1 C
+0.58 C
1967
12.7 C
+1.24 C
1968
11.8 C
+0.33 C
1969
11.1 C
-0.41 C
1970
11.6 C
+0.12 C
1971
11.8 C
+0.36 C
1972
11.3 C
-0.13 C
1973
12.0 C
+0.48 C
1974
11.9 C
+0.46 C
1975
11.1 C
-0.37 C
1976
11.2 C
-0.26 C
1977
11.2 C
-0.28 C
1978
10.5 C
-0.99 C
1979
10.5 C
-0.94 C
1980
10.8 C
-0.72 C
1981
11.5 C
-0.02 C
1982
10.8 C
-0.67 C
1983
11.2 C
-0.28 C
1984
10.6 C
-0.85 C
1985
9.6 C
-1.90 C
1986
11.8 C
+0.30 C
1987
11.9 C
+0.44 C
1988
12.0 C
+0.57 C
1990
11.8 C
+0.36 C
1993
10.7 C
-0.81 C
1994
12.7 C
+1.20 C
1995
12.6 C
+1.17 C
The fitted trend in annual mean temperature here over 1908 to 1995 is 0.00 C (-0.07 to 0.07) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.00 F (-0.12 to 0.12) per decade. The slope is a straight line fitted to 82 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Hermiston 1 SE
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.00 C (-0.07 to 0.07) per decade
0.00 F (-0.12 to 0.12) per decade
1908 to 1995
82
Not clearly different from zero
Mean daily maximum
-0.2 C (-0.3 to -0.1) per decade
-0.3 F (-0.5 to -0.2) per decade
1908 to 1995
82
Fall
Mean daily minimum
0.2 C (0.1 to 0.3) per decade
0.3 F (0.2 to 0.5) per decade
1908 to 1995
82
Rise
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
1906 to 1998
Yearly extremes at Hermiston 1 SE: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
45.0 C (113.0 F)
1961
40.0 C (104.0 F)
92
Coldest night (TNn)
-36.7 C (-34.1 F)
1919
-20.3 C (-4.5 F)
92
Wettest day (Rx1day)
85.3 mm (3.4 in)
1957
17.8 mm (0.7 in)
93
Wettest five days (Rx5day)
99.6 mm (3.9 in)
1957
27.6 mm (1.1 in)
93
Longest dry spell (CDD)
113 days
1932
57 days
93
Hottest day (TXx)
The hottest day of the year at Hermiston 1 SE, 1906 to 1998. The record is 45.0 C (113.0 F) in 1961, marked on the chart; the median year is 40.0 C (104.0 F).
Hottest day (TXx) at Hermiston 1 SE by year
Year
Hottest day (TXx)
1906
n/a
1907
42.2 C (108.0 F)
1908
42.2 C (108.0 F)
1909
38.9 C (102.0 F)
1910
39.4 C (102.9 F)
1911
42.2 C (108.0 F)
1912
38.3 C (100.9 F)
1913
40.6 C (105.1 F)
1914
40.0 C (104.0 F)
1915
40.0 C (104.0 F)
1916
38.9 C (102.0 F)
1917
41.1 C (106.0 F)
1918
41.1 C (106.0 F)
1919
42.2 C (108.0 F)
1920
38.3 C (100.9 F)
1921
38.3 C (100.9 F)
1922
42.2 C (108.0 F)
1923
38.3 C (100.9 F)
1924
40.6 C (105.1 F)
1925
41.1 C (106.0 F)
1926
43.3 C (109.9 F)
1927
40.6 C (105.1 F)
1928
43.3 C (109.9 F)
1929
40.0 C (104.0 F)
1930
40.0 C (104.0 F)
1931
42.2 C (108.0 F)
1932
38.3 C (100.9 F)
1933
40.6 C (105.1 F)
1934
41.1 C (106.0 F)
1935
43.3 C (109.9 F)
1936
41.7 C (107.1 F)
1937
40.6 C (105.1 F)
1938
42.2 C (108.0 F)
1939
44.4 C (111.9 F)
1940
40.0 C (104.0 F)
1941
42.2 C (108.0 F)
1942
41.7 C (107.1 F)
1943
38.3 C (100.9 F)
1944
40.0 C (104.0 F)
1945
39.4 C (102.9 F)
1946
42.2 C (108.0 F)
1947
38.3 C (100.9 F)
1948
40.6 C (105.1 F)
1949
38.9 C (102.0 F)
1950
38.3 C (100.9 F)
1951
38.9 C (102.0 F)
1952
41.1 C (106.0 F)
1953
39.4 C (102.9 F)
1954
37.8 C (100.0 F)
1955
40.6 C (105.1 F)
1956
40.0 C (104.0 F)
1957
37.2 C (99.0 F)
1958
41.7 C (107.1 F)
1959
42.2 C (108.0 F)
1960
42.8 C (109.0 F)
1961
45.0 C (113.0 F)
1962
40.0 C (104.0 F)
1963
37.8 C (100.0 F)
1964
39.4 C (102.9 F)
1965
40.0 C (104.0 F)
1966
37.8 C (100.0 F)
1967
41.1 C (106.0 F)
1968
42.2 C (108.0 F)
1969
38.3 C (100.9 F)
1970
40.0 C (104.0 F)
1971
42.2 C (108.0 F)
1972
42.2 C (108.0 F)
1973
38.9 C (102.0 F)
1974
38.9 C (102.0 F)
1975
41.1 C (106.0 F)
1976
38.3 C (100.9 F)
1977
39.4 C (102.9 F)
1978
40.0 C (104.0 F)
1979
40.6 C (105.1 F)
1980
37.8 C (100.0 F)
1981
37.8 C (100.0 F)
1982
37.8 C (100.0 F)
1983
38.9 C (102.0 F)
1984
36.7 C (98.1 F)
1985
38.9 C (102.0 F)
1986
38.9 C (102.0 F)
1987
39.4 C (102.9 F)
1988
38.9 C (102.0 F)
1989
37.2 C (99.0 F)
1990
40.6 C (105.1 F)
1991
16.7 C (62.1 F)
1992
41.7 C (107.1 F)
1993
37.8 C (100.0 F)
1994
41.7 C (107.1 F)
1995
39.4 C (102.9 F)
1996
21.1 C (70.0 F)
1997
39.4 C (102.9 F)
1998
15.0 C (59.0 F)
Coldest night (TNn)
The coldest night of the year at Hermiston 1 SE, 1906 to 1998. The record is -36.7 C (-34.1 F) in 1919, marked on the chart; the median year is -20.3 C (-4.5 F).
Coldest night (TNn) at Hermiston 1 SE by year
Year
Coldest night (TNn)
1906
n/a
1907
-10.6 C (12.9 F)
1908
-16.1 C (3.0 F)
1909
-33.9 C (-29.0 F)
1910
-18.9 C (-2.0 F)
1911
-17.2 C (1.0 F)
1912
-22.8 C (-9.0 F)
1913
-20.6 C (-5.1 F)
1914
-21.1 C (-6.0 F)
1915
-14.4 C (6.1 F)
1916
-32.8 C (-27.0 F)
1917
-17.8 C (0.0 F)
1918
-17.2 C (1.0 F)
1919
-36.7 C (-34.1 F)
1920
-13.3 C (8.1 F)
1921
-15.0 C (5.0 F)
1922
-33.9 C (-29.0 F)
1923
-21.7 C (-7.1 F)
1924
-26.1 C (-15.0 F)
1925
-8.9 C (16.0 F)
1926
-20.6 C (-5.1 F)
1927
-32.8 C (-27.0 F)
1928
-15.0 C (5.0 F)
1929
-30.6 C (-23.1 F)
1930
-32.2 C (-26.0 F)
1931
-17.8 C (0.0 F)
1932
-25.6 C (-14.1 F)
1933
-23.3 C (-9.9 F)
1934
-7.8 C (18.0 F)
1935
-21.1 C (-6.0 F)
1936
-26.1 C (-15.0 F)
1937
-30.6 C (-23.1 F)
1938
-14.4 C (6.1 F)
1939
-14.4 C (6.1 F)
1940
-15.0 C (5.0 F)
1941
-21.7 C (-7.1 F)
1942
-21.7 C (-7.1 F)
1943
-22.2 C (-8.0 F)
1944
-12.2 C (10.0 F)
1945
-18.9 C (-2.0 F)
1946
-12.8 C (9.0 F)
1947
-21.7 C (-7.1 F)
1948
-18.9 C (-2.0 F)
1949
-27.2 C (-17.0 F)
1950
-33.9 C (-29.0 F)
1951
-17.8 C (0.0 F)
1952
-19.4 C (-2.9 F)
1953
-6.7 C (19.9 F)
1954
-26.1 C (-15.0 F)
1955
-24.4 C (-11.9 F)
1956
-26.1 C (-15.0 F)
1957
-35.0 C (-31.0 F)
1958
-11.1 C (12.0 F)
1959
-19.4 C (-2.9 F)
1960
-15.0 C (5.0 F)
1961
-17.2 C (1.0 F)
1962
-23.9 C (-11.0 F)
1963
-21.7 C (-7.1 F)
1964
-22.2 C (-8.0 F)
1965
-12.2 C (10.0 F)
1966
-8.3 C (17.1 F)
1967
-16.1 C (3.0 F)
1968
-22.2 C (-8.0 F)
1969
-23.3 C (-9.9 F)
1970
-12.8 C (9.0 F)
1971
-12.8 C (9.0 F)
1972
-23.9 C (-11.0 F)
1973
-21.1 C (-6.0 F)
1974
-23.9 C (-11.0 F)
1975
-11.1 C (12.0 F)
1976
-13.9 C (7.0 F)
1977
-17.8 C (0.0 F)
1978
-23.3 C (-9.9 F)
1979
-25.0 C (-13.0 F)
1980
-20.0 C (-4.0 F)
1981
-11.1 C (12.0 F)
1982
-20.6 C (-5.1 F)
1983
-27.2 C (-17.0 F)
1984
-20.6 C (-5.1 F)
1985
-23.9 C (-11.0 F)
1986
-8.3 C (17.1 F)
1987
-11.1 C (12.0 F)
1988
-12.2 C (10.0 F)
1989
-24.4 C (-11.9 F)
1990
-27.8 C (-18.0 F)
1991
-13.3 C (8.1 F)
1992
-12.8 C (9.0 F)
1993
-21.7 C (-7.1 F)
1994
-15.6 C (3.9 F)
1995
-15.6 C (3.9 F)
1996
-26.1 C (-15.0 F)
1997
-12.8 C (9.0 F)
1998
-15.0 C (5.0 F)
Wettest day (Rx1day)
The wettest day of the year at Hermiston 1 SE, 1906 to 1998. The record is 85.3 mm (3.4 in) in 1957, marked on the chart; the median year is 17.8 mm (0.7 in).
Wettest day (Rx1day) at Hermiston 1 SE by year
Year
Wettest day (Rx1day)
1906
19.8 mm (0.8 in)
1907
22.9 mm (0.9 in)
1908
12.4 mm (0.5 in)
1909
25.9 mm (1.0 in)
1910
19.6 mm (0.8 in)
1911
13.2 mm (0.5 in)
1912
21.6 mm (0.9 in)
1913
12.7 mm (0.5 in)
1914
11.4 mm (0.4 in)
1915
14.7 mm (0.6 in)
1916
17.8 mm (0.7 in)
1917
17.8 mm (0.7 in)
1918
30.2 mm (1.2 in)
1919
20.3 mm (0.8 in)
1920
19.1 mm (0.8 in)
1921
36.3 mm (1.4 in)
1922
15.7 mm (0.6 in)
1923
18.3 mm (0.7 in)
1924
12.4 mm (0.5 in)
1925
17.3 mm (0.7 in)
1926
20.6 mm (0.8 in)
1927
16.5 mm (0.6 in)
1928
17.5 mm (0.7 in)
1929
14.7 mm (0.6 in)
1930
16.5 mm (0.6 in)
1931
13.0 mm (0.5 in)
1932
11.4 mm (0.4 in)
1933
17.8 mm (0.7 in)
1934
8.1 mm (0.32 in)
1935
17.8 mm (0.7 in)
1936
26.9 mm (1.1 in)
1937
20.8 mm (0.8 in)
1938
22.9 mm (0.9 in)
1939
15.2 mm (0.6 in)
1940
15.7 mm (0.6 in)
1941
22.1 mm (0.9 in)
1942
17.0 mm (0.7 in)
1943
19.6 mm (0.8 in)
1944
11.4 mm (0.4 in)
1945
15.2 mm (0.6 in)
1946
36.6 mm (1.4 in)
1947
21.6 mm (0.9 in)
1948
25.7 mm (1.0 in)
1949
12.4 mm (0.5 in)
1950
19.1 mm (0.8 in)
1951
11.9 mm (0.5 in)
1952
22.6 mm (0.9 in)
1953
20.6 mm (0.8 in)
1954
13.7 mm (0.5 in)
1955
18.0 mm (0.7 in)
1956
24.1 mm (0.9 in)
1957
85.3 mm (3.4 in)
1958
22.4 mm (0.9 in)
1959
18.8 mm (0.7 in)
1960
11.4 mm (0.4 in)
1961
14.2 mm (0.6 in)
1962
17.0 mm (0.7 in)
1963
10.4 mm (0.4 in)
1964
27.9 mm (1.1 in)
1965
13.2 mm (0.5 in)
1966
17.0 mm (0.7 in)
1967
8.4 mm (0.33 in)
1968
11.4 mm (0.4 in)
1969
21.3 mm (0.8 in)
1970
12.2 mm (0.5 in)
1971
15.0 mm (0.6 in)
1972
12.4 mm (0.5 in)
1973
21.8 mm (0.9 in)
1974
20.6 mm (0.8 in)
1975
24.4 mm (1.0 in)
1976
17.3 mm (0.7 in)
1977
21.6 mm (0.9 in)
1978
20.3 mm (0.8 in)
1979
39.9 mm (1.6 in)
1980
14.0 mm (0.6 in)
1981
25.4 mm (1.0 in)
1982
23.9 mm (0.9 in)
1983
18.0 mm (0.7 in)
1984
12.4 mm (0.5 in)
1985
19.6 mm (0.8 in)
1986
14.0 mm (0.6 in)
1987
18.3 mm (0.7 in)
1988
31.0 mm (1.2 in)
1989
17.5 mm (0.7 in)
1990
14.2 mm (0.6 in)
1991
9.4 mm (0.37 in)
1992
15.0 mm (0.6 in)
1993
15.2 mm (0.6 in)
1994
22.1 mm (0.9 in)
1995
22.4 mm (0.9 in)
1996
7.1 mm (0.28 in)
1997
18.8 mm (0.7 in)
1998
17.8 mm (0.7 in)
Wettest five days (Rx5day)
The wettest five days of the year at Hermiston 1 SE, 1906 to 1998. The record is 99.6 mm (3.9 in) in 1957, marked on the chart; the median year is 27.6 mm (1.1 in).
Wettest five days (Rx5day) at Hermiston 1 SE by year
Year
Wettest five days (Rx5day)
1906
22.5 mm (0.9 in)
1907
33.0 mm (1.3 in)
1908
19.6 mm (0.8 in)
1909
28.2 mm (1.1 in)
1910
24.2 mm (1.0 in)
1911
18.0 mm (0.7 in)
1912
31.0 mm (1.2 in)
1913
20.3 mm (0.8 in)
1914
27.9 mm (1.1 in)
1915
23.9 mm (0.9 in)
1916
42.1 mm (1.7 in)
1917
24.2 mm (1.0 in)
1918
34.0 mm (1.3 in)
1919
34.4 mm (1.4 in)
1920
30.8 mm (1.2 in)
1921
63.0 mm (2.5 in)
1922
20.8 mm (0.8 in)
1923
32.5 mm (1.3 in)
1924
21.9 mm (0.9 in)
1925
25.9 mm (1.0 in)
1926
28.4 mm (1.1 in)
1927
33.5 mm (1.3 in)
1928
32.2 mm (1.3 in)
1929
33.9 mm (1.3 in)
1930
27.5 mm (1.1 in)
1931
25.0 mm (1.0 in)
1932
20.0 mm (0.8 in)
1933
32.1 mm (1.3 in)
1934
13.7 mm (0.5 in)
1935
20.3 mm (0.8 in)
1936
26.9 mm (1.1 in)
1937
30.8 mm (1.2 in)
1938
31.0 mm (1.2 in)
1939
16.6 mm (0.7 in)
1940
27.9 mm (1.1 in)
1941
29.3 mm (1.2 in)
1942
35.5 mm (1.4 in)
1943
27.4 mm (1.1 in)
1944
17.5 mm (0.7 in)
1945
30.4 mm (1.2 in)
1946
36.9 mm (1.5 in)
1947
30.2 mm (1.2 in)
1948
33.8 mm (1.3 in)
1949
23.6 mm (0.9 in)
1950
38.0 mm (1.5 in)
1951
30.2 mm (1.2 in)
1952
24.9 mm (1.0 in)
1953
27.2 mm (1.1 in)
1954
14.3 mm (0.6 in)
1955
27.6 mm (1.1 in)
1956
33.0 mm (1.3 in)
1957
99.6 mm (3.9 in)
1958
35.5 mm (1.4 in)
1959
27.5 mm (1.1 in)
1960
18.6 mm (0.7 in)
1961
29.5 mm (1.2 in)
1962
35.3 mm (1.4 in)
1963
22.1 mm (0.9 in)
1964
59.7 mm (2.4 in)
1965
22.4 mm (0.9 in)
1966
32.2 mm (1.3 in)
1967
14.0 mm (0.6 in)
1968
23.0 mm (0.9 in)
1969
22.9 mm (0.9 in)
1970
31.7 mm (1.2 in)
1971
31.7 mm (1.2 in)
1972
17.5 mm (0.7 in)
1973
30.8 mm (1.2 in)
1974
40.7 mm (1.6 in)
1975
42.4 mm (1.7 in)
1976
19.3 mm (0.8 in)
1977
27.4 mm (1.1 in)
1978
25.1 mm (1.0 in)
1979
41.7 mm (1.6 in)
1980
30.0 mm (1.2 in)
1981
30.5 mm (1.2 in)
1982
27.4 mm (1.1 in)
1983
24.9 mm (1.0 in)
1984
21.1 mm (0.8 in)
1985
20.4 mm (0.8 in)
1986
25.2 mm (1.0 in)
1987
25.7 mm (1.0 in)
1988
48.8 mm (1.9 in)
1989
25.4 mm (1.0 in)
1990
22.8 mm (0.9 in)
1991
12.7 mm (0.5 in)
1992
24.4 mm (1.0 in)
1993
22.3 mm (0.9 in)
1994
45.1 mm (1.8 in)
1995
32.4 mm (1.3 in)
1996
25.4 mm (1.0 in)
1997
30.8 mm (1.2 in)
1998
35.4 mm (1.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Hermiston 1 SE, 1906 to 1998. The record is 113 days in 1932, marked on the chart; the median year is 57 days.
Longest dry spell (CDD) at Hermiston 1 SE by year
Year
Longest dry spell (CDD)
1906
42 days
1907
42 days
1908
45 days
1909
70 days
1910
72 days
1911
34 days
1912
37 days
1913
40 days
1914
81 days
1915
88 days
1916
79 days
1917
93 days
1918
42 days
1919
106 days
1920
36 days
1921
44 days
1922
63 days
1923
35 days
1924
51 days
1925
81 days
1926
58 days
1927
64 days
1928
52 days
1929
71 days
1930
69 days
1931
82 days
1932
113 days
1933
35 days
1934
56 days
1935
48 days
1936
90 days
1937
66 days
1938
60 days
1939
59 days
1940
77 days
1941
38 days
1942
42 days
1943
45 days
1944
70 days
1945
71 days
1946
63 days
1947
23 days
1948
72 days
1949
75 days
1950
96 days
1951
80 days
1952
66 days
1953
71 days
1954
34 days
1955
48 days
1956
43 days
1957
64 days
1958
70 days
1959
70 days
1960
46 days
1961
63 days
1962
54 days
1963
47 days
1964
50 days
1965
31 days
1966
74 days
1967
80 days
1968
55 days
1969
85 days
1970
68 days
1971
43 days
1972
36 days
1973
58 days
1974
111 days
1975
38 days
1976
36 days
1977
46 days
1978
67 days
1979
43 days
1980
60 days
1981
73 days
1982
34 days
1983
39 days
1984
77 days
1985
52 days
1986
43 days
1987
100 days
1988
102 days
1989
57 days
1990
45 days
1991
20 days
1992
42 days
1993
56 days
1994
64 days
1995
35 days
1996
9 days
1997
26 days
1998
4 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
82 years with a frost
Across 82 years with a frost, the median last spring frost at Hermiston 1 SE falls on 30 April and the median first autumn frost on 6 October, which leaves a median of 158 days between them.
In 1963 to 1995 the median growing season was 169 days. That is 20 days more than in 1908 to 1938.
Fitted over all years, the growing season changes by +3.7 days per decade at this station.
Frost dates and growing season at Hermiston 1 SE
Measure
Median, all years
Earliest period (1908 to 1938)
Recent period (1963 to 1995)
Recent against earliest
Fitted trend
Last spring frost
30 April
6 May
23 April
13 days earlier
-2.2 days per decade
First autumn frost
6 October
26 September
8 October
12 days later
+1.4 days per decade
Growing days
158 days
149 days
169 days
20 days more
+3.7 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
87 years, 1907 to 1995
A day with at least 17.3 mm (0.7 in) of rain is expected about once in 2 years. A day with at least 49.7 mm (2.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Hermiston 1 SE: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
17.3 mm (0.7 in)
5 years
23.6 mm (0.9 in)
10 years
28.6 mm (1.1 in)
25 years
36.0 mm (1.4 in)
50 years
42.4 mm (1.7 in)
100 years
49.7 mm (2.0 in)
Longer than the 87 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, 87 years of values from 1907 to 1995.
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: 85.3 mm (3.4 in) in 1957; 39.9 mm (1.6 in) in 1979; 36.6 mm (1.4 in) in 1946.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Hermiston 1 SE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Hermiston 1 SE 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.