Record envelope, standing records and threshold days for Union (USC00358746), Oregon, United States, with 116 years of record.
Key Facts for Union
Union (USC00358746) is a weather station in Oregon, United States at 45.20 latitude and -117.86 longitude, 846 m (2,777 ft) above sea level.
The station reports from 1911 to 2026, 116 years of record.
1,464 records set at Union still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Union set a daily record precipitation of 16.0 mm (0.6 in) on 22 April 2026.
About the Station
Location: Oregon, United States, 45.20 latitude, -117.86 longitude.
Elevation: 846 m (2,777 ft).
Period of record: 1911 to 2026, 116 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 Union. 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 Union, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
16.1 C (61.0 F)
-32.8 C (-27.0 F)
n/a
n/a
Feb
19.4 C (66.9 F)
-29.4 C (-20.9 F)
n/a
n/a
Mar
25.0 C (77.0 F)
-19.4 C (-2.9 F)
n/a
n/a
Apr
32.2 C (90.0 F)
-12.8 C (9.0 F)
n/a
n/a
May
35.0 C (95.0 F)
-6.7 C (19.9 F)
n/a
n/a
Jun
38.3 C (100.9 F)
-1.7 C (28.9 F)
n/a
n/a
Jul
40.6 C (105.1 F)
0.0 C (32.0 F)
n/a
n/a
Aug
42.2 C (108.0 F)
-2.2 C (28.0 F)
n/a
n/a
Sep
38.3 C (100.9 F)
-7.8 C (18.0 F)
n/a
n/a
Oct
31.7 C (89.1 F)
-13.9 C (7.0 F)
n/a
n/a
Nov
23.3 C (73.9 F)
-24.4 C (-11.9 F)
n/a
n/a
Dec
16.7 C (62.1 F)
-31.1 C (-24.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Union still stand. 1919 holds the most, with 38.
Standing records at Union by the year they were set
Year set
Standing records
1911
4
1912
15
1913
19
1914
13
1915
13
1916
26
1917
29
1918
20
1919
38
1920
17
1921
14
1922
15
1923
5
1924
26
1925
6
1926
16
1927
15
1928
5
1929
13
1930
17
1931
14
1932
26
1933
20
1934
28
1935
11
1936
26
1937
14
1938
6
1939
22
1940
7
1941
5
1942
10
1943
8
1944
7
1945
19
1946
6
1947
11
1948
15
1949
24
1950
21
1951
7
1952
11
1953
16
1954
10
1955
24
1956
13
1957
10
1958
16
1959
7
1960
21
1961
20
1962
23
1963
21
1964
11
1965
16
1966
14
1967
18
1968
15
1969
8
1970
11
1971
18
1972
15
1973
6
1974
20
1975
19
1976
8
1977
15
1978
13
1979
8
1980
14
1981
14
1982
8
1983
15
1984
5
1985
23
1986
22
1987
20
1988
11
1989
13
1990
21
1991
6
1992
21
1993
13
1994
8
1995
9
1996
14
1997
9
1998
4
1999
14
2000
10
2001
15
2002
15
2003
31
2004
6
2005
11
2006
20
2007
18
2008
13
2009
11
2010
10
All-Time Record Progression
4 new records
4 all-time records were set at Union between 18 January 1943 and 13 July 2002. Each dot is a new record.
When Union set new all-time records
Date
Kind
Detail
1943-01-18
Record low minimum temperature
Record low minimum temperature -32.8 C (-27.0 F)
1961-08-05
Record high maximum temperature
Record high maximum temperature 42.2 C (108.0 F)
1989-01-10
Record snow depth
Record snow depth 45.7 cm (18.0 in)
2002-07-13
Record high minimum temperature
Record high minimum temperature 20.6 C (69.1 F)
Wettest Day of Each Month
Sep: 51.1 mm (2.0 in)
The wettest day on record for each calendar month at Union. The most was 51.1 mm (2.0 in) on 23 September 1917.
Record daily precipitation for each month at Union
Month
Record daily precipitation (mm)
Date
Jan
36.8 mm (1.4 in)
28 January 1965
Feb
31.8 mm (1.3 in)
23 February 1986
Mar
25.7 mm (1.0 in)
24 March 2002
Apr
27.9 mm (1.1 in)
6 April 1969
May
48.3 mm (1.9 in)
8 May 1952
Jun
43.7 mm (1.7 in)
26 June 1934
Jul
26.9 mm (1.1 in)
1 July 1982
Aug
40.4 mm (1.6 in)
31 August 1984
Sep
51.1 mm (2.0 in)
23 September 1917
Oct
37.8 mm (1.5 in)
7 October 1930
Nov
34.3 mm (1.4 in)
28 November 1995
Dec
30.5 mm (1.2 in)
28 December 1917
Period of Record Coverage
1911 to 2011
Complete yearUnder 90 percent of days
101 years of record at Union, 1911 to 2011. 3 years have data for under 90 percent of days and are left out of rankings: 1911, 1998, 2011.
Cooler than the station meanWarmer than the station mean
One stripe for each of 97 complete years at Union, 1912 to 2010. Blue stripes are years cooler than the station's own mean of 8.8 C (47.9 F); red stripes are warmer. The coolest year was 1985, at 7.0 C (44.5 F), and the warmest was 1934, at 10.6 C (51.0 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Union as warming stripes, 1912 to 2010
Year
Annual mean temperature
Difference from the station mean
1912
7.9 C
-0.90 C
1913
7.6 C
-1.21 C
1914
9.4 C
+0.59 C
1915
9.1 C
+0.33 C
1916
7.2 C
-1.65 C
1917
8.0 C
-0.79 C
1918
8.9 C
+0.04 C
1919
8.0 C
-0.85 C
1920
8.0 C
-0.83 C
1921
8.8 C
+0.00 C
1922
8.0 C
-0.79 C
1923
8.6 C
-0.21 C
1924
8.0 C
-0.83 C
1925
9.6 C
+0.81 C
1926
8.9 C
+0.10 C
1927
8.0 C
-0.80 C
1928
8.8 C
-0.05 C
1929
8.0 C
-0.85 C
1930
8.1 C
-0.67 C
1931
8.7 C
-0.08 C
1932
7.6 C
-1.20 C
1933
8.0 C
-0.83 C
1934
10.6 C
+1.76 C
1935
8.3 C
-0.51 C
1936
8.8 C
+0.01 C
1937
8.3 C
-0.48 C
1938
9.4 C
+0.63 C
1939
9.5 C
+0.67 C
1940
10.1 C
+1.27 C
1941
9.8 C
+0.94 C
1942
8.8 C
-0.06 C
1943
8.5 C
-0.27 C
1944
8.7 C
-0.11 C
1945
9.0 C
+0.18 C
1946
8.6 C
-0.18 C
1947
9.2 C
+0.35 C
1948
7.8 C
-0.99 C
1949
8.4 C
-0.38 C
1950
8.8 C
-0.03 C
1951
8.6 C
-0.25 C
1952
8.8 C
-0.06 C
1953
9.6 C
+0.77 C
1954
9.0 C
+0.23 C
1955
7.7 C
-1.12 C
1956
8.6 C
-0.24 C
1957
8.3 C
-0.51 C
1958
10.0 C
+1.20 C
1959
8.5 C
-0.30 C
1960
8.5 C
-0.33 C
1961
9.4 C
+0.55 C
1962
8.4 C
-0.38 C
1963
9.1 C
+0.29 C
1964
7.8 C
-1.05 C
1965
8.9 C
+0.06 C
1966
9.3 C
+0.45 C
1967
9.5 C
+0.64 C
1968
8.8 C
+0.02 C
1969
8.8 C
-0.02 C
1970
8.6 C
-0.20 C
1971
8.3 C
-0.55 C
1972
8.2 C
-0.60 C
1973
9.2 C
+0.37 C
1974
8.6 C
-0.17 C
1975
7.6 C
-1.24 C
1976
8.6 C
-0.18 C
1977
9.1 C
+0.24 C
1978
8.7 C
-0.10 C
1979
8.8 C
-0.06 C
1980
9.0 C
+0.15 C
1981
9.5 C
+0.64 C
1982
8.2 C
-0.57 C
1983
9.2 C
+0.34 C
1984
7.7 C
-1.08 C
1985
7.0 C
-1.85 C
1986
9.6 C
+0.77 C
1987
9.8 C
+0.95 C
1988
9.2 C
+0.42 C
1989
8.2 C
-0.58 C
1990
9.1 C
+0.27 C
1991
9.0 C
+0.19 C
1992
10.1 C
+1.25 C
1993
7.8 C
-1.02 C
1994
9.6 C
+0.74 C
1995
9.4 C
+0.59 C
1996
9.1 C
+0.32 C
1997
9.3 C
+0.52 C
1999
9.5 C
+0.64 C
2000
9.6 C
+0.76 C
2001
9.7 C
+0.89 C
2002
9.1 C
+0.31 C
2003
10.4 C
+1.62 C
2004
9.4 C
+0.55 C
2005
9.2 C
+0.37 C
2006
9.9 C
+1.06 C
2007
10.0 C
+1.20 C
2009
8.9 C
+0.09 C
2010
9.6 C
+0.75 C
The annual mean temperature here has risen by 0.10 C (0.05 to 0.14) per decade over 1912 to 2010. In Fahrenheit: 0.2 F (0.1 to 0.3) per decade. The slope is a straight line fitted to 97 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Union
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.10 C (0.05 to 0.14) per decade
0.2 F (0.1 to 0.3) per decade
1912 to 2010
97
Rise
Mean daily maximum
0.10 C (0.04 to 0.16) per decade
0.2 F (0.1 to 0.3) per decade
1912 to 2010
97
Rise
Mean daily minimum
0.09 C (0.04 to 0.14) per decade
0.2 F (0.1 to 0.2) per decade
1912 to 2010
97
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
1911 to 2026
Yearly extremes at Union: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.2 C (108.0 F)
1961
36.7 C (98.1 F)
101
Coldest night (TNn)
-32.8 C (-27.0 F)
1943
-20.6 C (-5.1 F)
101
Wettest day (Rx1day)
51.1 mm (2.0 in)
1917
22.9 mm (0.9 in)
111
Wettest five days (Rx5day)
81.0 mm (3.2 in)
1991
39.9 mm (1.6 in)
111
Longest dry spell (CDD)
81 days
2005
35 days
111
Hottest day (TXx)
The hottest day of the year at Union, 1911 to 2026. The record is 42.2 C (108.0 F) in 1961, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Union by year
Year
Hottest day (TXx)
1911
25.6 C (78.1 F)
1912
32.2 C (90.0 F)
1913
35.6 C (96.1 F)
1914
37.2 C (99.0 F)
1915
36.7 C (98.1 F)
1916
34.4 C (93.9 F)
1917
35.6 C (96.1 F)
1918
37.2 C (99.0 F)
1919
36.7 C (98.1 F)
1920
36.1 C (97.0 F)
1921
35.6 C (96.1 F)
1922
36.7 C (98.1 F)
1923
36.7 C (98.1 F)
1924
38.3 C (100.9 F)
1925
37.2 C (99.0 F)
1926
36.1 C (97.0 F)
1927
34.4 C (93.9 F)
1928
37.8 C (100.0 F)
1929
36.7 C (98.1 F)
1930
35.6 C (96.1 F)
1931
39.4 C (102.9 F)
1932
36.7 C (98.1 F)
1933
38.9 C (102.0 F)
1934
39.4 C (102.9 F)
1935
38.3 C (100.9 F)
1936
37.2 C (99.0 F)
1937
34.4 C (93.9 F)
1938
36.7 C (98.1 F)
1939
37.8 C (100.0 F)
1940
37.8 C (100.0 F)
1941
36.7 C (98.1 F)
1942
35.0 C (95.0 F)
1943
35.0 C (95.0 F)
1944
35.6 C (96.1 F)
1945
35.6 C (96.1 F)
1946
37.2 C (99.0 F)
1947
36.7 C (98.1 F)
1948
35.6 C (96.1 F)
1949
37.8 C (100.0 F)
1950
38.3 C (100.9 F)
1951
37.2 C (99.0 F)
1952
35.0 C (95.0 F)
1953
37.8 C (100.0 F)
1954
35.0 C (95.0 F)
1955
37.2 C (99.0 F)
1956
36.1 C (97.0 F)
1957
35.6 C (96.1 F)
1958
36.7 C (98.1 F)
1959
38.3 C (100.9 F)
1960
38.9 C (102.0 F)
1961
42.2 C (108.0 F)
1962
35.6 C (96.1 F)
1963
35.0 C (95.0 F)
1964
36.1 C (97.0 F)
1965
35.6 C (96.1 F)
1966
38.3 C (100.9 F)
1967
40.0 C (104.0 F)
1968
36.7 C (98.1 F)
1969
37.8 C (100.0 F)
1970
36.7 C (98.1 F)
1971
37.2 C (99.0 F)
1972
37.8 C (100.0 F)
1973
35.6 C (96.1 F)
1974
34.4 C (93.9 F)
1975
37.2 C (99.0 F)
1976
36.1 C (97.0 F)
1977
38.3 C (100.9 F)
1978
38.3 C (100.9 F)
1979
37.2 C (99.0 F)
1980
38.9 C (102.0 F)
1981
36.1 C (97.0 F)
1982
36.1 C (97.0 F)
1983
37.2 C (99.0 F)
1984
36.7 C (98.1 F)
1985
38.3 C (100.9 F)
1986
36.7 C (98.1 F)
1987
37.2 C (99.0 F)
1988
38.9 C (102.0 F)
1989
36.7 C (98.1 F)
1990
38.3 C (100.9 F)
1991
35.6 C (96.1 F)
1992
37.8 C (100.0 F)
1993
33.9 C (93.0 F)
1994
40.0 C (104.0 F)
1995
34.4 C (93.9 F)
1996
38.3 C (100.9 F)
1997
36.1 C (97.0 F)
1998
29.4 C (84.9 F)
1999
37.2 C (99.0 F)
2000
38.3 C (100.9 F)
2001
38.3 C (100.9 F)
2002
40.6 C (105.1 F)
2003
40.0 C (104.0 F)
2004
36.7 C (98.1 F)
2005
38.3 C (100.9 F)
2006
38.9 C (102.0 F)
2007
40.6 C (105.1 F)
2008
36.7 C (98.1 F)
2009
38.3 C (100.9 F)
2010
37.2 C (99.0 F)
2011
12.2 C (54.0 F)
2017
n/a
2018
n/a
2019
n/a
2020
n/a
2021
n/a
2022
n/a
2023
n/a
2024
n/a
2025
n/a
2026
n/a
Coldest night (TNn)
The coldest night of the year at Union, 1911 to 2026. The record is -32.8 C (-27.0 F) in 1943, marked on the chart; the median year is -20.6 C (-5.1 F).
Coldest night (TNn) at Union by year
Year
Coldest night (TNn)
1911
-12.8 C (9.0 F)
1912
-16.1 C (3.0 F)
1913
-21.7 C (-7.1 F)
1914
-20.0 C (-4.0 F)
1915
-24.4 C (-11.9 F)
1916
-26.7 C (-16.1 F)
1917
-19.4 C (-2.9 F)
1918
-24.4 C (-11.9 F)
1919
-31.1 C (-24.0 F)
1920
-18.9 C (-2.0 F)
1921
-16.7 C (1.9 F)
1922
-24.4 C (-11.9 F)
1923
-16.1 C (3.0 F)
1924
-27.8 C (-18.0 F)
1925
-13.3 C (8.1 F)
1926
-24.4 C (-11.9 F)
1927
-25.6 C (-14.1 F)
1928
-15.6 C (3.9 F)
1929
-28.3 C (-18.9 F)
1930
-31.1 C (-24.0 F)
1931
-16.7 C (1.9 F)
1932
-25.6 C (-14.1 F)
1933
-29.4 C (-20.9 F)
1934
-7.8 C (18.0 F)
1935
-22.8 C (-9.0 F)
1936
-22.2 C (-8.0 F)
1937
-28.3 C (-18.9 F)
1938
-13.3 C (8.1 F)
1939
-18.9 C (-2.0 F)
1940
-16.1 C (3.0 F)
1941
-12.2 C (10.0 F)
1942
-20.6 C (-5.1 F)
1943
-32.8 C (-27.0 F)
1944
-16.7 C (1.9 F)
1945
-22.2 C (-8.0 F)
1946
-15.6 C (3.9 F)
1947
-23.9 C (-11.0 F)
1948
-21.1 C (-6.0 F)
1949
-25.0 C (-13.0 F)
1950
-28.9 C (-20.0 F)
1951
-21.1 C (-6.0 F)
1952
-17.2 C (1.0 F)
1953
-15.0 C (5.0 F)
1954
-19.4 C (-2.9 F)
1955
-24.4 C (-11.9 F)
1956
-27.8 C (-18.0 F)
1957
-26.1 C (-15.0 F)
1958
-14.4 C (6.1 F)
1959
-28.9 C (-20.0 F)
1960
-18.9 C (-2.0 F)
1961
-22.8 C (-9.0 F)
1962
-24.4 C (-11.9 F)
1963
-26.7 C (-16.1 F)
1964
-31.1 C (-24.0 F)
1965
-17.2 C (1.0 F)
1966
-15.0 C (5.0 F)
1967
-20.0 C (-4.0 F)
1968
-23.9 C (-11.0 F)
1969
-17.8 C (0.0 F)
1970
-12.8 C (9.0 F)
1971
-17.8 C (0.0 F)
1972
-26.1 C (-15.0 F)
1973
-20.0 C (-4.0 F)
1974
-23.9 C (-11.0 F)
1975
-12.2 C (10.0 F)
1976
-17.8 C (0.0 F)
1977
-21.7 C (-7.1 F)
1978
-23.3 C (-9.9 F)
1979
-23.9 C (-11.0 F)
1980
-22.2 C (-8.0 F)
1981
-12.8 C (9.0 F)
1982
-23.9 C (-11.0 F)
1983
-27.8 C (-18.0 F)
1984
-18.9 C (-2.0 F)
1985
-23.9 C (-11.0 F)
1986
-12.8 C (9.0 F)
1987
-18.3 C (-0.9 F)
1988
-21.1 C (-6.0 F)
1989
-25.0 C (-13.0 F)
1990
-30.0 C (-22.0 F)
1991
-19.4 C (-2.9 F)
1992
-18.9 C (-2.0 F)
1993
-18.3 C (-0.9 F)
1994
-16.7 C (1.9 F)
1995
-16.1 C (3.0 F)
1996
-28.3 C (-18.9 F)
1997
-15.0 C (5.0 F)
1998
-22.2 C (-8.0 F)
1999
-11.1 C (12.0 F)
2000
-12.8 C (9.0 F)
2001
-16.1 C (3.0 F)
2002
-16.7 C (1.9 F)
2003
-21.7 C (-7.1 F)
2004
-25.6 C (-14.1 F)
2005
-15.6 C (3.9 F)
2006
-18.9 C (-2.0 F)
2007
-16.7 C (1.9 F)
2008
-20.6 C (-5.1 F)
2009
-19.4 C (-2.9 F)
2010
-22.2 C (-8.0 F)
2011
-21.1 C (-6.0 F)
2017
n/a
2018
n/a
2019
n/a
2020
n/a
2021
n/a
2022
n/a
2023
n/a
2024
n/a
2025
n/a
2026
n/a
Wettest day (Rx1day)
The wettest day of the year at Union, 1911 to 2026. The record is 51.1 mm (2.0 in) in 1917, marked on the chart; the median year is 22.9 mm (0.9 in).
Wettest day (Rx1day) at Union by year
Year
Wettest day (Rx1day)
1911
12.4 mm (0.5 in)
1912
24.9 mm (1.0 in)
1913
28.4 mm (1.1 in)
1914
17.8 mm (0.7 in)
1915
27.9 mm (1.1 in)
1916
16.5 mm (0.6 in)
1917
51.1 mm (2.0 in)
1918
22.9 mm (0.9 in)
1919
19.8 mm (0.8 in)
1920
31.5 mm (1.2 in)
1921
25.7 mm (1.0 in)
1922
11.7 mm (0.5 in)
1923
22.4 mm (0.9 in)
1924
16.8 mm (0.7 in)
1925
24.1 mm (0.9 in)
1926
29.2 mm (1.1 in)
1927
19.3 mm (0.8 in)
1928
20.3 mm (0.8 in)
1929
18.3 mm (0.7 in)
1930
37.8 mm (1.5 in)
1931
15.2 mm (0.6 in)
1932
16.3 mm (0.6 in)
1933
20.3 mm (0.8 in)
1934
43.7 mm (1.7 in)
1935
26.7 mm (1.1 in)
1936
11.7 mm (0.5 in)
1937
19.6 mm (0.8 in)
1938
19.1 mm (0.8 in)
1939
11.2 mm (0.4 in)
1940
22.6 mm (0.9 in)
1941
26.2 mm (1.0 in)
1942
24.4 mm (1.0 in)
1943
13.7 mm (0.5 in)
1944
16.5 mm (0.6 in)
1945
17.5 mm (0.7 in)
1946
22.6 mm (0.9 in)
1947
25.4 mm (1.0 in)
1948
33.0 mm (1.3 in)
1949
25.1 mm (1.0 in)
1950
13.5 mm (0.5 in)
1951
21.8 mm (0.9 in)
1952
48.3 mm (1.9 in)
1953
33.3 mm (1.3 in)
1954
27.9 mm (1.1 in)
1955
21.3 mm (0.8 in)
1956
23.6 mm (0.9 in)
1957
27.9 mm (1.1 in)
1958
22.9 mm (0.9 in)
1959
21.1 mm (0.8 in)
1960
29.2 mm (1.1 in)
1961
21.6 mm (0.9 in)
1962
17.5 mm (0.7 in)
1963
26.7 mm (1.1 in)
1964
15.0 mm (0.6 in)
1965
36.8 mm (1.4 in)
1966
20.6 mm (0.8 in)
1967
15.7 mm (0.6 in)
1968
22.9 mm (0.9 in)
1969
27.9 mm (1.1 in)
1970
33.8 mm (1.3 in)
1971
18.3 mm (0.7 in)
1972
20.3 mm (0.8 in)
1973
19.8 mm (0.8 in)
1974
16.8 mm (0.7 in)
1975
31.0 mm (1.2 in)
1976
24.9 mm (1.0 in)
1977
21.6 mm (0.9 in)
1978
26.7 mm (1.1 in)
1979
33.0 mm (1.3 in)
1980
25.4 mm (1.0 in)
1981
16.3 mm (0.6 in)
1982
26.9 mm (1.1 in)
1983
20.8 mm (0.8 in)
1984
40.4 mm (1.6 in)
1985
20.6 mm (0.8 in)
1986
31.8 mm (1.3 in)
1987
15.0 mm (0.6 in)
1988
20.3 mm (0.8 in)
1989
23.9 mm (0.9 in)
1990
24.4 mm (1.0 in)
1991
36.1 mm (1.4 in)
1992
25.9 mm (1.0 in)
1993
19.3 mm (0.8 in)
1994
25.4 mm (1.0 in)
1995
34.3 mm (1.4 in)
1996
25.4 mm (1.0 in)
1997
21.3 mm (0.8 in)
1998
33.8 mm (1.3 in)
1999
33.3 mm (1.3 in)
2000
19.8 mm (0.8 in)
2001
15.2 mm (0.6 in)
2002
25.7 mm (1.0 in)
2003
25.7 mm (1.0 in)
2004
25.4 mm (1.0 in)
2005
23.4 mm (0.9 in)
2006
15.5 mm (0.6 in)
2007
21.6 mm (0.9 in)
2008
18.8 mm (0.7 in)
2009
28.7 mm (1.1 in)
2010
27.9 mm (1.1 in)
2011
25.4 mm (1.0 in)
2017
19.3 mm (0.8 in)
2018
25.9 mm (1.0 in)
2019
30.5 mm (1.2 in)
2020
27.9 mm (1.1 in)
2021
25.4 mm (1.0 in)
2022
31.0 mm (1.2 in)
2023
15.2 mm (0.6 in)
2024
21.8 mm (0.9 in)
2025
12.7 mm (0.5 in)
2026
16.0 mm (0.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Union, 1911 to 2026. The record is 81.0 mm (3.2 in) in 1991, marked on the chart; the median year is 39.9 mm (1.6 in).
Wettest five days (Rx5day) at Union by year
Year
Wettest five days (Rx5day)
1911
14.4 mm (0.6 in)
1912
38.9 mm (1.5 in)
1913
43.4 mm (1.7 in)
1914
28.2 mm (1.1 in)
1915
46.5 mm (1.8 in)
1916
40.6 mm (1.6 in)
1917
60.2 mm (2.4 in)
1918
36.2 mm (1.4 in)
1919
44.9 mm (1.8 in)
1920
45.2 mm (1.8 in)
1921
50.3 mm (2.0 in)
1922
27.1 mm (1.1 in)
1923
68.6 mm (2.7 in)
1924
26.7 mm (1.1 in)
1925
31.5 mm (1.2 in)
1926
34.9 mm (1.4 in)
1927
45.4 mm (1.8 in)
1928
24.7 mm (1.0 in)
1929
35.3 mm (1.4 in)
1930
47.3 mm (1.9 in)
1931
32.3 mm (1.3 in)
1932
42.3 mm (1.7 in)
1933
33.0 mm (1.3 in)
1934
48.3 mm (1.9 in)
1935
33.0 mm (1.3 in)
1936
26.2 mm (1.0 in)
1937
27.5 mm (1.1 in)
1938
41.6 mm (1.6 in)
1939
21.1 mm (0.8 in)
1940
30.2 mm (1.2 in)
1941
37.4 mm (1.5 in)
1942
50.5 mm (2.0 in)
1943
28.4 mm (1.1 in)
1944
37.7 mm (1.5 in)
1945
29.0 mm (1.1 in)
1946
43.2 mm (1.7 in)
1947
43.7 mm (1.7 in)
1948
49.2 mm (1.9 in)
1949
38.1 mm (1.5 in)
1950
29.7 mm (1.2 in)
1951
37.6 mm (1.5 in)
1952
50.4 mm (2.0 in)
1953
50.6 mm (2.0 in)
1954
41.1 mm (1.6 in)
1955
37.3 mm (1.5 in)
1956
58.9 mm (2.3 in)
1957
39.9 mm (1.6 in)
1958
61.2 mm (2.4 in)
1959
33.1 mm (1.3 in)
1960
46.7 mm (1.8 in)
1961
37.6 mm (1.5 in)
1962
40.4 mm (1.6 in)
1963
36.5 mm (1.4 in)
1964
39.7 mm (1.6 in)
1965
80.8 mm (3.2 in)
1966
31.8 mm (1.3 in)
1967
31.2 mm (1.2 in)
1968
40.2 mm (1.6 in)
1969
35.6 mm (1.4 in)
1970
46.0 mm (1.8 in)
1971
29.4 mm (1.2 in)
1972
41.1 mm (1.6 in)
1973
30.9 mm (1.2 in)
1974
35.3 mm (1.4 in)
1975
45.5 mm (1.8 in)
1976
30.8 mm (1.2 in)
1977
48.0 mm (1.9 in)
1978
44.7 mm (1.8 in)
1979
54.4 mm (2.1 in)
1980
45.7 mm (1.8 in)
1981
35.8 mm (1.4 in)
1982
47.7 mm (1.9 in)
1983
33.7 mm (1.3 in)
1984
61.5 mm (2.4 in)
1985
44.5 mm (1.8 in)
1986
50.1 mm (2.0 in)
1987
20.1 mm (0.8 in)
1988
28.5 mm (1.1 in)
1989
50.4 mm (2.0 in)
1990
41.4 mm (1.6 in)
1991
81.0 mm (3.2 in)
1992
30.5 mm (1.2 in)
1993
35.3 mm (1.4 in)
1994
45.0 mm (1.8 in)
1995
56.1 mm (2.2 in)
1996
46.8 mm (1.8 in)
1997
48.5 mm (1.9 in)
1998
73.4 mm (2.9 in)
1999
47.0 mm (1.9 in)
2000
25.7 mm (1.0 in)
2001
26.4 mm (1.0 in)
2002
41.4 mm (1.6 in)
2003
28.0 mm (1.1 in)
2004
39.6 mm (1.6 in)
2005
41.7 mm (1.6 in)
2006
38.7 mm (1.5 in)
2007
27.7 mm (1.1 in)
2008
25.4 mm (1.0 in)
2009
40.5 mm (1.6 in)
2010
45.6 mm (1.8 in)
2011
28.4 mm (1.1 in)
2017
34.8 mm (1.4 in)
2018
32.7 mm (1.3 in)
2019
58.4 mm (2.3 in)
2020
64.9 mm (2.6 in)
2021
56.1 mm (2.2 in)
2022
53.1 mm (2.1 in)
2023
46.4 mm (1.8 in)
2024
26.7 mm (1.1 in)
2025
30.0 mm (1.2 in)
2026
23.1 mm (0.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Union, 1911 to 2026. The record is 81 days in 2005, marked on the chart; the median year is 35 days.
Longest dry spell (CDD) at Union by year
Year
Longest dry spell (CDD)
1911
17 days
1912
16 days
1913
18 days
1914
37 days
1915
39 days
1916
28 days
1917
73 days
1918
31 days
1919
35 days
1920
34 days
1921
23 days
1922
54 days
1923
35 days
1924
41 days
1925
38 days
1926
32 days
1927
55 days
1928
37 days
1929
43 days
1930
29 days
1931
56 days
1932
28 days
1933
24 days
1934
59 days
1935
32 days
1936
49 days
1937
35 days
1938
26 days
1939
49 days
1940
38 days
1941
19 days
1942
30 days
1943
55 days
1944
35 days
1945
42 days
1946
51 days
1947
36 days
1948
29 days
1949
66 days
1950
31 days
1951
45 days
1952
63 days
1953
42 days
1954
28 days
1955
52 days
1956
30 days
1957
22 days
1958
19 days
1959
26 days
1960
45 days
1961
64 days
1962
24 days
1963
23 days
1964
18 days
1965
36 days
1966
45 days
1967
41 days
1968
33 days
1969
78 days
1970
36 days
1971
32 days
1972
36 days
1973
36 days
1974
47 days
1975
18 days
1976
33 days
1977
36 days
1978
47 days
1979
37 days
1980
21 days
1981
80 days
1982
19 days
1983
22 days
1984
32 days
1985
29 days
1986
34 days
1987
37 days
1988
37 days
1989
33 days
1990
31 days
1991
41 days
1992
28 days
1993
50 days
1994
28 days
1995
30 days
1996
31 days
1997
22 days
1998
14 days
1999
57 days
2000
54 days
2001
39 days
2002
23 days
2003
35 days
2004
20 days
2005
81 days
2006
35 days
2007
36 days
2008
26 days
2009
51 days
2010
25 days
2011
4 days
2017
42 days
2018
66 days
2019
38 days
2020
48 days
2021
40 days
2022
27 days
2023
40 days
2024
28 days
2025
43 days
2026
38 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
97 years with a frost
Across 97 years with a frost, the median last spring frost at Union falls on 23 May and the median first autumn frost on 18 September, which leaves a median of 118 days between them.
In 1979 to 2010 the median growing season was 132 days. That is 14 days more than in 1912 to 1941.
Fitted over all years, the growing season changes by +3.0 days per decade at this station.
Frost dates and growing season at Union
Measure
Median, all years
Earliest period (1912 to 1941)
Recent period (1979 to 2010)
Recent against earliest
Fitted trend
Last spring frost
23 May
27 May
14 May
13 days earlier
-1.6 days per decade
First autumn frost
18 September
14 September
22 September
8 days later
+1.4 days per decade
Growing days
118 days
118 days
132 days
14 days more
+3.0 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
102 years, 1914 to 2025
A day with at least 22.9 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 43.4 mm (1.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Union: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
22.9 mm (0.9 in)
5 years
29.2 mm (1.1 in)
10 years
33.0 mm (1.3 in)
25 years
37.5 mm (1.5 in)
50 years
40.5 mm (1.6 in)
100 years
43.4 mm (1.7 in)
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 102 years of values from 1914 to 2025.
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: 48.3 mm (1.9 in) in 1952; 43.7 mm (1.7 in) in 1934; 40.4 mm (1.6 in) in 1984.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Union standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Union 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.