Record envelope, standing records and threshold days for Dillon (USC00382386), South Carolina, United States, with 118 years of record.
Key Facts for Dillon
Dillon (USC00382386) is a weather station in South Carolina, United States at 34.41 latitude and -79.36 longitude, 36 m (118 ft) above sea level.
The station reports from 1904 to 2021, 118 years of record.
1,464 records set at Dillon still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Dillon tied a daily record high maximum temperature of 36.1 C (97.0 F) on 25 May 2019.
About the Station
Location: South Carolina, United States, 34.41 latitude, -79.36 longitude.
Elevation: 36 m (118 ft).
Period of record: 1904 to 2021, 118 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 Dillon. 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 Dillon, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
27.2 C (81.0 F)
-18.3 C (-0.9 F)
n/a
n/a
Feb
29.4 C (84.9 F)
-15.0 C (5.0 F)
n/a
n/a
Mar
36.1 C (97.0 F)
-11.7 C (10.9 F)
n/a
n/a
Apr
34.4 C (93.9 F)
-4.4 C (24.1 F)
n/a
n/a
May
38.9 C (102.0 F)
-1.1 C (30.0 F)
n/a
n/a
Jun
41.7 C (107.1 F)
5.6 C (42.1 F)
n/a
n/a
Jul
40.6 C (105.1 F)
9.4 C (48.9 F)
n/a
n/a
Aug
41.1 C (106.0 F)
8.9 C (48.0 F)
n/a
n/a
Sep
38.9 C (102.0 F)
2.2 C (36.0 F)
n/a
n/a
Oct
37.8 C (100.0 F)
-7.8 C (18.0 F)
n/a
n/a
Nov
31.7 C (89.1 F)
-11.1 C (12.0 F)
n/a
n/a
Dec
27.8 C (82.0 F)
-16.7 C (1.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Dillon still stand. 1967 holds the most, with 36.
Standing records at Dillon by the year they were set
Year set
Standing records
1904
8
1905
27
1906
22
1907
35
1908
18
1909
26
1910
20
1911
18
1912
20
1913
14
1914
26
1915
12
1916
12
1917
5
1936
32
1937
14
1938
11
1939
1
1941
19
1942
14
1943
24
1944
13
1945
8
1946
14
1947
14
1948
11
1949
7
1950
27
1951
12
1952
12
1953
3
1954
27
1955
12
1956
12
1957
8
1958
11
1959
10
1960
18
1961
19
1962
20
1963
15
1964
18
1965
15
1966
28
1967
36
1968
14
1969
15
1970
23
1971
15
1972
15
1973
22
1974
25
1975
10
1976
32
1977
22
1978
11
1979
13
1980
23
1981
26
1982
13
1983
35
1984
16
1985
35
1986
19
1987
7
1988
11
1989
21
1990
8
1991
18
1992
11
1993
15
1994
5
1995
10
1996
16
1997
12
1998
10
1999
15
2000
9
2001
9
2002
17
2003
7
2004
6
2005
7
2006
2
2007
18
2008
14
2009
2
2010
14
2011
7
2012
4
2013
7
2014
11
2015
9
2016
2
2017
9
2018
18
2019
1
All-Time Record Progression
7 new records
7 all-time records were set at Dillon between 18 February 1958 and 24 December 1989. Each dot is a new record.
When Dillon set new all-time records
Date
Kind
Detail
1958-02-18
Record low maximum temperature
Record low maximum temperature -5.6 C (21.9 F)
1962-12-13
Record low minimum temperature
Record low minimum temperature -15.0 C (5.0 F)
1972-01-17
Record low maximum temperature
Record low maximum temperature -6.1 C (21.0 F)
1979-09-05
Record daily precipitation
Record daily precipitation 194.3 mm (7.6 in)
1983-03-25
Record snow depth
Record snow depth 17.8 cm (7.0 in)
1985-01-21
Record low minimum temperature
Record low minimum temperature -18.3 C (-0.9 F)
1989-12-24
Record low maximum temperature
Record low maximum temperature -7.8 C (18.0 F)
Wettest Day of Each Month
Sep: 194.3 mm (7.6 in)
The wettest day on record for each calendar month at Dillon. The most was 194.3 mm (7.6 in) on 5 September 1979.
Record daily precipitation for each month at Dillon
Month
Record daily precipitation (mm)
Date
Jan
83.8 mm (3.3 in)
11 January 1955
Feb
74.9 mm (2.9 in)
17 February 1998
Mar
122.4 mm (4.8 in)
18 March 1983
Apr
86.4 mm (3.4 in)
6 April 2008
May
123.2 mm (4.9 in)
18 May 2012
Jun
149.4 mm (5.9 in)
23 June 1967
Jul
193.0 mm (7.6 in)
14 July 1916
Aug
121.2 mm (4.8 in)
19 August 1942
Sep
194.3 mm (7.6 in)
5 September 1979
Oct
113.8 mm (4.5 in)
18 October 1968
Nov
94.0 mm (3.7 in)
29 November 2011
Dec
88.9 mm (3.5 in)
23 December 1994
Period of Record Coverage
1904 to 2021
Complete yearUnder 90 percent of days
99 years of record at Dillon, 1904 to 2021. 31 years have data for under 90 percent of days and are left out of rankings: 1904, 1909, 1912, 1916, 1917, 1936, 1937, 1938 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 64 complete years at Dillon, 1905 to 2017. Blue stripes are years cooler than the station's own mean of 16.7 C (62.1 F); red stripes are warmer. The coolest year was 1966, at 15.2 C (59.3 F), and the warmest was 1949, at 18.2 C (64.7 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Dillon as warming stripes, 1905 to 2017
Year
Annual mean temperature
Difference from the station mean
1905
17.1 C
+0.41 C
1907
17.1 C
+0.43 C
1908
17.5 C
+0.83 C
1910
17.4 C
+0.65 C
1911
18.2 C
+1.44 C
1913
17.5 C
+0.78 C
1914
16.6 C
-0.07 C
1915
17.1 C
+0.43 C
1942
17.6 C
+0.88 C
1943
17.1 C
+0.41 C
1944
17.1 C
+0.38 C
1945
17.6 C
+0.88 C
1946
17.8 C
+1.04 C
1947
16.9 C
+0.22 C
1948
17.3 C
+0.54 C
1949
18.2 C
+1.44 C
1956
17.0 C
+0.30 C
1957
16.9 C
+0.22 C
1959
16.9 C
+0.15 C
1960
15.8 C
-0.95 C
1961
16.3 C
-0.40 C
1962
16.4 C
-0.36 C
1963
15.5 C
-1.25 C
1964
15.9 C
-0.77 C
1965
16.1 C
-0.64 C
1966
15.2 C
-1.53 C
1968
15.6 C
-1.11 C
1969
15.5 C
-1.22 C
1970
16.4 C
-0.34 C
1971
16.6 C
-0.12 C
1972
16.2 C
-0.55 C
1973
16.6 C
-0.11 C
1974
16.9 C
+0.22 C
1975
17.2 C
+0.51 C
1976
15.7 C
-0.99 C
1977
16.5 C
-0.21 C
1978
16.1 C
-0.57 C
1979
16.2 C
-0.48 C
1980
16.4 C
-0.34 C
1981
15.8 C
-0.95 C
1982
16.9 C
+0.20 C
1983
16.5 C
-0.22 C
1984
16.8 C
+0.06 C
1987
16.6 C
-0.12 C
1988
15.8 C
-0.94 C
1989
16.4 C
-0.34 C
1990
18.0 C
+1.26 C
1991
17.4 C
+0.67 C
1992
16.3 C
-0.45 C
1993
16.9 C
+0.16 C
1994
17.0 C
+0.27 C
1995
16.5 C
-0.22 C
1996
16.1 C
-0.64 C
1997
16.5 C
-0.23 C
1999
17.1 C
+0.41 C
2000
16.3 C
-0.41 C
2001
17.0 C
+0.24 C
2002
17.3 C
+0.63 C
2003
16.4 C
-0.30 C
2004
16.7 C
+0.02 C
2008
16.4 C
-0.34 C
2009
16.2 C
-0.47 C
2013
16.6 C
-0.13 C
2017
18.1 C
+1.38 C
The annual mean temperature here has fallen by 0.07 C (0.02 to 0.13) per decade over 1905 to 2017. In Fahrenheit: 0.13 F (0.03 to 0.23) per decade. The slope is a straight line fitted to 64 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Dillon
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.07 C (-0.13 to -0.02) per decade
-0.13 F (-0.23 to -0.03) per decade
1905 to 2017
64
Fall
Mean daily maximum
-0.10 C (-0.16 to -0.05) per decade
-0.2 F (-0.3 to -0.1) per decade
1905 to 2017
64
Fall
Mean daily minimum
-0.04 C (-0.12 to 0.04) per decade
-0.1 F (-0.2 to 0.1) per decade
1905 to 2017
64
Not clearly different from zero
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
1904 to 2021
Yearly extremes at Dillon: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.7 C (107.1 F)
1954
37.2 C (99.0 F)
99
Coldest night (TNn)
-18.3 C (-0.9 F)
1985
-9.4 C (15.1 F)
99
Wettest day (Rx1day)
194.3 mm (7.6 in)
1979
74.6 mm (2.9 in)
98
Wettest five days (Rx5day)
246.1 mm (9.7 in)
1968
110.1 mm (4.3 in)
96
Longest dry spell (CDD)
47 days
1968
20 days
97
Hottest day (TXx)
The hottest day of the year at Dillon, 1904 to 2021. The record is 41.7 C (107.1 F) in 1954, marked on the chart; the median year is 37.2 C (99.0 F).
Hottest day (TXx) at Dillon by year
Year
Hottest day (TXx)
1904
39.4 C (102.9 F)
1905
38.3 C (100.9 F)
1906
37.8 C (100.0 F)
1907
39.4 C (102.9 F)
1908
37.2 C (99.0 F)
1909
37.2 C (99.0 F)
1910
37.2 C (99.0 F)
1911
40.0 C (104.0 F)
1912
38.9 C (102.0 F)
1913
37.2 C (99.0 F)
1914
40.0 C (104.0 F)
1915
38.3 C (100.9 F)
1916
36.1 C (97.0 F)
1917
38.3 C (100.9 F)
1936
40.6 C (105.1 F)
1937
38.3 C (100.9 F)
1938
37.8 C (100.0 F)
1939
24.4 C (75.9 F)
1940
24.4 C (75.9 F)
1941
37.8 C (100.0 F)
1942
39.4 C (102.9 F)
1943
39.4 C (102.9 F)
1944
37.8 C (100.0 F)
1945
36.7 C (98.1 F)
1946
37.2 C (99.0 F)
1947
37.2 C (99.0 F)
1948
37.2 C (99.0 F)
1949
38.3 C (100.9 F)
1950
37.8 C (100.0 F)
1951
37.2 C (99.0 F)
1952
40.0 C (104.0 F)
1953
28.3 C (82.9 F)
1954
41.7 C (107.1 F)
1955
36.1 C (97.0 F)
1956
36.1 C (97.0 F)
1957
36.7 C (98.1 F)
1958
36.7 C (98.1 F)
1959
38.9 C (102.0 F)
1960
36.7 C (98.1 F)
1961
35.6 C (96.1 F)
1962
36.7 C (98.1 F)
1963
37.2 C (99.0 F)
1964
36.7 C (98.1 F)
1965
35.0 C (95.0 F)
1966
37.2 C (99.0 F)
1967
35.6 C (96.1 F)
1968
38.9 C (102.0 F)
1969
37.2 C (99.0 F)
1970
38.3 C (100.9 F)
1971
35.6 C (96.1 F)
1972
36.7 C (98.1 F)
1973
36.1 C (97.0 F)
1974
36.7 C (98.1 F)
1975
37.8 C (100.0 F)
1976
35.6 C (96.1 F)
1977
39.4 C (102.9 F)
1978
37.8 C (100.0 F)
1979
38.3 C (100.9 F)
1980
39.4 C (102.9 F)
1981
38.9 C (102.0 F)
1982
37.2 C (99.0 F)
1983
41.1 C (106.0 F)
1984
38.9 C (102.0 F)
1985
39.4 C (102.9 F)
1986
38.9 C (102.0 F)
1987
37.2 C (99.0 F)
1988
37.8 C (100.0 F)
1989
36.1 C (97.0 F)
1990
40.0 C (104.0 F)
1991
38.9 C (102.0 F)
1992
37.2 C (99.0 F)
1993
38.3 C (100.9 F)
1994
35.6 C (96.1 F)
1995
37.2 C (99.0 F)
1996
35.6 C (96.1 F)
1997
36.1 C (97.0 F)
1998
37.8 C (100.0 F)
1999
37.8 C (100.0 F)
2000
35.6 C (96.1 F)
2001
36.7 C (98.1 F)
2002
38.3 C (100.9 F)
2003
34.4 C (93.9 F)
2004
35.6 C (96.1 F)
2005
37.8 C (100.0 F)
2006
37.8 C (100.0 F)
2007
41.1 C (106.0 F)
2008
38.9 C (102.0 F)
2009
36.7 C (98.1 F)
2010
38.3 C (100.9 F)
2011
39.4 C (102.9 F)
2012
39.4 C (102.9 F)
2013
36.7 C (98.1 F)
2014
36.7 C (98.1 F)
2015
38.9 C (102.0 F)
2016
36.7 C (98.1 F)
2017
36.1 C (97.0 F)
2018
37.8 C (100.0 F)
2019
36.1 C (97.0 F)
2021
7.2 C (45.0 F)
Coldest night (TNn)
The coldest night of the year at Dillon, 1904 to 2021. The record is -18.3 C (-0.9 F) in 1985, marked on the chart; the median year is -9.4 C (15.1 F).
Coldest night (TNn) at Dillon by year
Year
Coldest night (TNn)
1904
-6.7 C (19.9 F)
1905
-12.2 C (10.0 F)
1906
-11.7 C (10.9 F)
1907
-8.9 C (16.0 F)
1908
-8.3 C (17.1 F)
1909
-10.0 C (14.0 F)
1910
-10.0 C (14.0 F)
1911
-6.1 C (21.0 F)
1912
-14.4 C (6.1 F)
1913
-6.1 C (21.0 F)
1914
-7.2 C (19.0 F)
1915
-5.6 C (21.9 F)
1916
-8.3 C (17.1 F)
1917
18.3 C (64.9 F)
1936
1.7 C (35.1 F)
1937
-6.7 C (19.9 F)
1938
-2.2 C (28.0 F)
1939
-6.7 C (19.9 F)
1940
-5.0 C (23.0 F)
1941
-5.6 C (21.9 F)
1942
-11.1 C (12.0 F)
1943
-13.9 C (7.0 F)
1944
-9.4 C (15.1 F)
1945
-9.4 C (15.1 F)
1946
-7.2 C (19.0 F)
1947
-11.1 C (12.0 F)
1948
-9.4 C (15.1 F)
1949
-6.1 C (21.0 F)
1950
-10.0 C (14.0 F)
1951
-9.4 C (15.1 F)
1952
-6.1 C (21.0 F)
1953
-10.6 C (12.9 F)
1954
-7.8 C (18.0 F)
1955
-10.0 C (14.0 F)
1956
-7.8 C (18.0 F)
1957
-10.6 C (12.9 F)
1958
-12.2 C (10.0 F)
1959
-12.2 C (10.0 F)
1960
-11.7 C (10.9 F)
1961
-11.1 C (12.0 F)
1962
-15.0 C (5.0 F)
1963
-10.6 C (12.9 F)
1964
-11.1 C (12.0 F)
1965
-9.4 C (15.1 F)
1966
-12.8 C (9.0 F)
1967
-11.1 C (12.0 F)
1968
-11.7 C (10.9 F)
1969
-11.1 C (12.0 F)
1970
-13.9 C (7.0 F)
1971
-9.4 C (15.1 F)
1972
-12.2 C (10.0 F)
1973
-15.0 C (5.0 F)
1974
-8.3 C (17.1 F)
1975
-11.7 C (10.9 F)
1976
-12.8 C (9.0 F)
1977
-12.8 C (9.0 F)
1978
-11.1 C (12.0 F)
1979
-10.6 C (12.9 F)
1980
-11.7 C (10.9 F)
1981
-14.4 C (6.1 F)
1982
-15.0 C (5.0 F)
1983
-14.4 C (6.1 F)
1984
-8.3 C (17.1 F)
1985
-18.3 C (-0.9 F)
1986
-12.2 C (10.0 F)
1987
-5.6 C (21.9 F)
1988
-7.8 C (18.0 F)
1989
-16.7 C (1.9 F)
1990
-4.4 C (24.1 F)
1991
-8.3 C (17.1 F)
1992
-5.0 C (23.0 F)
1993
-7.2 C (19.0 F)
1994
-11.7 C (10.9 F)
1995
-8.9 C (16.0 F)
1996
-12.2 C (10.0 F)
1997
-7.8 C (18.0 F)
1998
-5.6 C (21.9 F)
1999
-7.8 C (18.0 F)
2000
-7.8 C (18.0 F)
2001
-7.2 C (19.0 F)
2002
-7.8 C (18.0 F)
2003
-10.0 C (14.0 F)
2004
-8.9 C (16.0 F)
2005
-10.0 C (14.0 F)
2006
-8.9 C (16.0 F)
2007
-7.2 C (19.0 F)
2008
-8.9 C (16.0 F)
2009
-10.0 C (14.0 F)
2010
-10.6 C (12.9 F)
2011
-8.9 C (16.0 F)
2012
-8.3 C (17.1 F)
2013
-7.2 C (19.0 F)
2014
-11.7 C (10.9 F)
2015
-11.7 C (10.9 F)
2016
-8.3 C (17.1 F)
2017
-8.9 C (16.0 F)
2018
-11.7 C (10.9 F)
2019
-4.4 C (24.1 F)
2021
2.8 C (37.0 F)
Wettest day (Rx1day)
The wettest day of the year at Dillon, 1904 to 2021. The record is 194.3 mm (7.6 in) in 1979, marked on the chart; the median year is 74.6 mm (2.9 in).
Wettest day (Rx1day) at Dillon by year
Year
Wettest day (Rx1day)
1904
183.9 mm (7.2 in)
1905
75.9 mm (3.0 in)
1906
70.4 mm (2.8 in)
1907
50.8 mm (2.0 in)
1908
93.7 mm (3.7 in)
1909
58.7 mm (2.3 in)
1910
69.3 mm (2.7 in)
1911
86.6 mm (3.4 in)
1912
82.6 mm (3.3 in)
1913
80.5 mm (3.2 in)
1914
67.1 mm (2.6 in)
1915
77.5 mm (3.1 in)
1916
193.0 mm (7.6 in)
1917
143.5 mm (5.6 in)
1936
68.8 mm (2.7 in)
1937
53.8 mm (2.1 in)
1938
81.8 mm (3.2 in)
1939
16.5 mm (0.6 in)
1940
7.4 mm (0.29 in)
1941
74.2 mm (2.9 in)
1942
121.2 mm (4.8 in)
1943
90.2 mm (3.6 in)
1944
60.5 mm (2.4 in)
1945
127.3 mm (5.0 in)
1946
81.3 mm (3.2 in)
1947
118.9 mm (4.7 in)
1948
105.2 mm (4.1 in)
1949
114.0 mm (4.5 in)
1950
51.6 mm (2.0 in)
1951
55.9 mm (2.2 in)
1952
71.4 mm (2.8 in)
1953
48.3 mm (1.9 in)
1954
50.8 mm (2.0 in)
1955
83.8 mm (3.3 in)
1956
54.6 mm (2.1 in)
1957
45.7 mm (1.8 in)
1958
51.1 mm (2.0 in)
1959
76.2 mm (3.0 in)
1960
93.5 mm (3.7 in)
1961
61.5 mm (2.4 in)
1962
58.4 mm (2.3 in)
1963
72.9 mm (2.9 in)
1964
96.5 mm (3.8 in)
1965
83.8 mm (3.3 in)
1966
72.9 mm (2.9 in)
1967
149.4 mm (5.9 in)
1968
113.8 mm (4.5 in)
1969
86.9 mm (3.4 in)
1970
61.0 mm (2.4 in)
1971
97.5 mm (3.8 in)
1972
54.1 mm (2.1 in)
1973
71.1 mm (2.8 in)
1974
96.0 mm (3.8 in)
1975
66.0 mm (2.6 in)
1976
63.5 mm (2.5 in)
1977
59.9 mm (2.4 in)
1978
85.1 mm (3.4 in)
1979
194.3 mm (7.6 in)
1980
43.9 mm (1.7 in)
1981
91.9 mm (3.6 in)
1982
82.6 mm (3.3 in)
1983
122.4 mm (4.8 in)
1984
59.7 mm (2.4 in)
1985
54.6 mm (2.1 in)
1986
38.1 mm (1.5 in)
1987
101.6 mm (4.0 in)
1988
60.5 mm (2.4 in)
1989
55.1 mm (2.2 in)
1990
68.1 mm (2.7 in)
1991
72.9 mm (2.9 in)
1992
62.2 mm (2.4 in)
1993
62.2 mm (2.4 in)
1994
88.9 mm (3.5 in)
1995
63.5 mm (2.5 in)
1996
101.6 mm (4.0 in)
1997
72.4 mm (2.9 in)
1998
74.9 mm (2.9 in)
1999
138.4 mm (5.4 in)
2000
85.1 mm (3.4 in)
2001
40.6 mm (1.6 in)
2002
76.2 mm (3.0 in)
2003
58.4 mm (2.3 in)
2004
110.5 mm (4.4 in)
2005
81.3 mm (3.2 in)
2006
91.4 mm (3.6 in)
2007
54.6 mm (2.1 in)
2008
152.4 mm (6.0 in)
2009
50.8 mm (2.0 in)
2010
94.7 mm (3.7 in)
2011
94.0 mm (3.7 in)
2012
123.2 mm (4.9 in)
2013
94.0 mm (3.7 in)
2014
50.8 mm (2.0 in)
2015
50.8 mm (2.0 in)
2016
117.3 mm (4.6 in)
2017
76.2 mm (3.0 in)
2018
55.4 mm (2.2 in)
2019
40.6 mm (1.6 in)
2021
n/a
Wettest five days (Rx5day)
The wettest five days of the year at Dillon, 1904 to 2021. The record is 246.1 mm (9.7 in) in 1968, marked on the chart; the median year is 110.1 mm (4.3 in).
Wettest five days (Rx5day) at Dillon by year
Year
Wettest five days (Rx5day)
1904
183.9 mm (7.2 in)
1905
75.9 mm (3.0 in)
1906
149.9 mm (5.9 in)
1907
121.2 mm (4.8 in)
1908
121.4 mm (4.8 in)
1909
76.3 mm (3.0 in)
1910
120.9 mm (4.8 in)
1911
105.2 mm (4.1 in)
1912
130.8 mm (5.1 in)
1913
114.9 mm (4.5 in)
1914
70.9 mm (2.8 in)
1915
98.3 mm (3.9 in)
1916
215.1 mm (8.5 in)
1917
163.1 mm (6.4 in)
1936
47.0 mm (1.9 in)
1937
139.8 mm (5.5 in)
1938
152.6 mm (6.0 in)
1939
20.6 mm (0.8 in)
1940
n/a
1941
104.4 mm (4.1 in)
1942
154.0 mm (6.1 in)
1943
141.3 mm (5.6 in)
1944
78.7 mm (3.1 in)
1945
218.2 mm (8.6 in)
1946
113.3 mm (4.5 in)
1947
148.9 mm (5.9 in)
1948
163.5 mm (6.4 in)
1949
122.9 mm (4.8 in)
1950
74.5 mm (2.9 in)
1951
77.0 mm (3.0 in)
1952
93.3 mm (3.7 in)
1953
57.2 mm (2.3 in)
1954
58.2 mm (2.3 in)
1955
95.0 mm (3.7 in)
1956
86.1 mm (3.4 in)
1957
78.0 mm (3.1 in)
1958
85.1 mm (3.4 in)
1959
95.6 mm (3.8 in)
1960
121.9 mm (4.8 in)
1961
84.4 mm (3.3 in)
1962
95.5 mm (3.8 in)
1963
93.5 mm (3.7 in)
1964
140.1 mm (5.5 in)
1965
115.0 mm (4.5 in)
1966
122.6 mm (4.8 in)
1967
165.1 mm (6.5 in)
1968
246.1 mm (9.7 in)
1969
176.5 mm (6.9 in)
1970
83.3 mm (3.3 in)
1971
151.6 mm (6.0 in)
1972
98.3 mm (3.9 in)
1973
89.4 mm (3.5 in)
1974
203.5 mm (8.0 in)
1975
118.0 mm (4.6 in)
1976
115.0 mm (4.5 in)
1977
81.0 mm (3.2 in)
1978
103.6 mm (4.1 in)
1979
224.8 mm (8.9 in)
1980
87.4 mm (3.4 in)
1981
179.2 mm (7.1 in)
1982
114.4 mm (4.5 in)
1983
127.2 mm (5.0 in)
1984
87.6 mm (3.4 in)
1985
105.4 mm (4.1 in)
1986
73.7 mm (2.9 in)
1987
136.9 mm (5.4 in)
1988
73.7 mm (2.9 in)
1989
85.1 mm (3.4 in)
1990
93.8 mm (3.7 in)
1991
78.7 mm (3.1 in)
1992
178.1 mm (7.0 in)
1993
104.7 mm (4.1 in)
1994
99.4 mm (3.9 in)
1995
172.5 mm (6.8 in)
1996
160.5 mm (6.3 in)
1997
110.8 mm (4.4 in)
1998
89.0 mm (3.5 in)
1999
171.0 mm (6.7 in)
2000
123.7 mm (4.9 in)
2001
80.0 mm (3.1 in)
2002
136.7 mm (5.4 in)
2003
117.6 mm (4.6 in)
2004
133.1 mm (5.2 in)
2005
99.6 mm (3.9 in)
2006
100.9 mm (4.0 in)
2007
81.0 mm (3.2 in)
2008
184.2 mm (7.3 in)
2009
103.4 mm (4.1 in)
2010
97.0 mm (3.8 in)
2011
109.4 mm (4.3 in)
2012
145.3 mm (5.7 in)
2013
139.5 mm (5.5 in)
2014
102.2 mm (4.0 in)
2015
102.1 mm (4.0 in)
2016
125.7 mm (4.9 in)
2017
114.3 mm (4.5 in)
2018
85.4 mm (3.4 in)
2019
n/a
2021
n/a
Longest dry spell (CDD)
The longest dry spell of the year at Dillon, 1904 to 2021. The record is 47 days in 1968, marked on the chart; the median year is 20 days.
Longest dry spell (CDD) at Dillon by year
Year
Longest dry spell (CDD)
1904
22 days
1905
19 days
1906
21 days
1907
19 days
1908
21 days
1909
35 days
1910
24 days
1911
16 days
1912
26 days
1913
15 days
1914
23 days
1915
22 days
1916
20 days
1917
21 days
1936
18 days
1937
34 days
1938
23 days
1939
6 days
1940
n/a
1941
27 days
1942
18 days
1943
43 days
1944
20 days
1945
19 days
1946
21 days
1947
16 days
1948
17 days
1949
21 days
1950
21 days
1951
23 days
1952
16 days
1953
11 days
1954
24 days
1955
28 days
1956
20 days
1957
16 days
1958
21 days
1959
16 days
1960
22 days
1961
16 days
1962
14 days
1963
25 days
1964
18 days
1965
18 days
1966
18 days
1967
19 days
1968
47 days
1969
20 days
1970
27 days
1971
22 days
1972
18 days
1973
25 days
1974
22 days
1975
17 days
1976
25 days
1977
19 days
1978
21 days
1979
17 days
1980
21 days
1981
23 days
1982
12 days
1983
21 days
1984
16 days
1985
25 days
1986
33 days
1987
25 days
1988
23 days
1989
21 days
1990
20 days
1991
22 days
1992
21 days
1993
21 days
1994
17 days
1995
16 days
1996
16 days
1997
21 days
1998
25 days
1999
23 days
2000
39 days
2001
47 days
2002
16 days
2003
17 days
2004
16 days
2005
20 days
2006
18 days
2007
19 days
2008
17 days
2009
11 days
2010
11 days
2011
17 days
2012
26 days
2013
15 days
2014
13 days
2015
13 days
2016
35 days
2017
18 days
2018
10 days
2019
3 days
2021
n/a
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
64 years with a frost
Across 64 years with a frost, the median last spring frost at Dillon falls on 2 April and the median first autumn frost on 31 October, which leaves a median of 211 days between them.
In 1976 to 2017 the median growing season was 225 days. That is 20 days more than in 1905 to 1971.
Fitted over all years, the growing season changes by +1.8 days per decade at this station.
Frost dates and growing season at Dillon
Measure
Median, all years
Earliest period (1905 to 1971)
Recent period (1976 to 2017)
Recent against earliest
Fitted trend
Last spring frost
2 April
4 April
24 March
11 days earlier
-1.1 days per decade
First autumn frost
31 October
28 October
7 November
10 days later
+0.7 days per decade
Growing days
211 days
205 days
225 days
20 days more
+1.8 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
75 years, 1904 to 2017
A day with at least 75.4 mm (3.0 in) of rain is expected about once in 2 years. A day with at least 195.5 mm (7.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Dillon: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
75.4 mm (3.0 in)
5 years
100.8 mm (4.0 in)
10 years
120.1 mm (4.7 in)
25 years
147.5 mm (5.8 in)
50 years
170.4 mm (6.7 in)
100 years
195.5 mm (7.7 in)
Longer than the 75 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, 75 years of values from 1904 to 2017.
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: 194.3 mm (7.6 in) in 1979; 183.9 mm (7.2 in) in 1904; 152.4 mm (6.0 in) in 2008.
Station Changes
3 suspected
3 changes were suspected in the annual mean temperature of Dillon, at 1956, 1974 and 1988. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1956 ran 0.4 C (0.6 F) lower than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1974 ran 0.3 C (0.5 F) higher than in the years before (possible change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1988 ran 0.2 C (0.3 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Dillon, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1956
-0.3
-0.6
likely
5
1974
+0.3
+0.5
possible
5
1988
-0.2
-0.3
possible
5
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Data for Dillon standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Dillon 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.