Record envelope, standing records and threshold days for Chelsea (USC00431360), Vermont, United States, with 108 years of record.
Key Facts for Chelsea
Chelsea (USC00431360) is a weather station in Vermont, United States at 43.98 latitude and -72.45 longitude, 244 m (800 ft) above sea level.
The station reports from 1893 to 2000, 108 years of record.
1,464 records set at Chelsea still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Chelsea set a daily record low maximum temperature of -15.0 C (5.0 F) on 29 January 2000.
About the Station
Location: Vermont, United States, 43.98 latitude, -72.45 longitude.
Elevation: 244 m (800 ft).
Period of record: 1893 to 2000, 108 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 Chelsea. 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 Chelsea, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
18.9 C (66.0 F)
-38.3 C (-36.9 F)
n/a
n/a
Feb
16.7 C (62.1 F)
-43.9 C (-47.0 F)
n/a
n/a
Mar
27.8 C (82.0 F)
-35.6 C (-32.1 F)
n/a
n/a
Apr
32.8 C (91.0 F)
-20.6 C (-5.1 F)
n/a
n/a
May
33.9 C (93.0 F)
-8.9 C (16.0 F)
n/a
n/a
Jun
36.7 C (98.1 F)
-3.9 C (25.0 F)
n/a
n/a
Jul
36.7 C (98.1 F)
-0.6 C (30.9 F)
n/a
n/a
Aug
37.8 C (100.0 F)
-2.8 C (27.0 F)
n/a
n/a
Sep
33.9 C (93.0 F)
-9.4 C (15.1 F)
n/a
n/a
Oct
31.7 C (89.1 F)
-12.8 C (9.0 F)
n/a
n/a
Nov
25.0 C (77.0 F)
-27.2 C (-17.0 F)
n/a
n/a
Dec
20.0 C (68.0 F)
-40.0 C (-40.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Chelsea still stand. 1956 holds the most, with 33.
Standing records at Chelsea by the year they were set
Year set
Standing records
1895
10
1896
26
1897
11
1898
14
1899
21
1900
15
1901
23
1902
15
1903
18
1904
16
1905
16
1906
16
1907
18
1908
14
1909
19
1910
14
1911
18
1912
11
1913
21
1914
22
1915
11
1916
15
1917
14
1918
22
1919
15
1920
10
1921
15
1922
9
1923
9
1924
8
1925
14
1926
15
1927
4
1928
12
1929
9
1930
5
1931
13
1932
12
1933
12
1934
13
1935
4
1936
20
1937
14
1938
15
1939
13
1940
20
1941
14
1942
27
1943
14
1944
15
1945
18
1946
25
1947
16
1948
24
1949
16
1950
19
1951
12
1952
12
1953
22
1954
14
1955
13
1956
33
1957
12
1958
9
1959
15
1960
8
1961
15
1962
16
1963
20
1964
23
1965
10
1966
14
1967
12
1968
14
1969
13
1970
12
1971
8
1972
14
1973
4
1974
11
1975
9
1976
14
1977
14
1978
7
1979
27
1980
5
1981
18
1982
18
1983
5
1984
13
1985
3
1986
9
1987
11
1988
14
1989
12
1990
11
1991
14
1992
10
1993
9
1994
12
1995
11
1996
8
1997
5
1998
6
1999
10
2000
4
All-Time Record Progression
4 new records
4 all-time records were set at Chelsea between 4 November 1927 and 17 September 1999. Each dot is a new record.
When Chelsea set new all-time records
Date
Kind
Detail
1927-11-04
Record daily precipitation
Record daily precipitation 114.8 mm (4.5 in)
1937-08-30
Record high maximum temperature
Record high maximum temperature 37.8 C (100.0 F)
1943-02-16
Record low minimum temperature
Record low minimum temperature -43.9 C (-47.0 F)
1999-09-17
Record daily precipitation
Record daily precipitation 119.6 mm (4.7 in)
Wettest Day of Each Month
Sep: 119.6 mm (4.7 in)
The wettest day on record for each calendar month at Chelsea. The most was 119.6 mm (4.7 in) on 17 September 1999.
Record daily precipitation for each month at Chelsea
Month
Record daily precipitation (mm)
Date
Jan
54.1 mm (2.1 in)
27 January 1986
Feb
51.8 mm (2.0 in)
23 February 1974
Mar
58.4 mm (2.3 in)
1 March 1914
Apr
56.9 mm (2.2 in)
29 April 1988
May
59.9 mm (2.4 in)
20 May 1999
Jun
79.2 mm (3.1 in)
29 June 1922
Jul
94.5 mm (3.7 in)
6 July 1897
Aug
86.4 mm (3.4 in)
28 August 1911
Sep
119.6 mm (4.7 in)
17 September 1999
Oct
90.2 mm (3.6 in)
24 October 1923
Nov
114.8 mm (4.5 in)
4 November 1927
Dec
57.2 mm (2.3 in)
12 December 1952
Period of Record Coverage
1895 to 2000
Complete yearUnder 90 percent of days
106 years of record at Chelsea, 1895 to 2000. 9 years have data for under 90 percent of days and are left out of rankings: 1895, 1909, 1911, 1912, 1914, 1917, 1919, 1930 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 95 complete years at Chelsea, 1896 to 1999. Blue stripes are years cooler than the station's own mean of 5.3 C (41.5 F); red stripes are warmer. The coolest year was 1904, at 3.3 C (38.0 F), and the warmest was 1949, at 6.9 C (44.5 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at Chelsea as warming stripes, 1896 to 1999
Year
Annual mean temperature
Difference from the station mean
1896
4.9 C
-0.35 C
1897
5.3 C
+0.04 C
1898
6.1 C
+0.77 C
1899
5.4 C
+0.12 C
1900
5.4 C
+0.07 C
1901
5.1 C
-0.20 C
1902
5.1 C
-0.16 C
1903
5.0 C
-0.26 C
1904
3.3 C
-1.95 C
1905
4.3 C
-0.97 C
1906
4.8 C
-0.52 C
1908
4.9 C
-0.37 C
1910
5.3 C
+0.05 C
1913
6.5 C
+1.16 C
1915
6.3 C
+1.04 C
1916
5.3 C
+0.05 C
1918
4.8 C
-0.49 C
1920
5.2 C
-0.05 C
1921
6.5 C
+1.24 C
1923
5.1 C
-0.21 C
1924
5.0 C
-0.27 C
1925
5.7 C
+0.42 C
1926
4.3 C
-1.00 C
1927
5.9 C
+0.62 C
1928
5.9 C
+0.60 C
1929
5.6 C
+0.27 C
1931
6.1 C
+0.79 C
1932
6.0 C
+0.68 C
1933
5.7 C
+0.45 C
1934
5.1 C
-0.21 C
1935
5.4 C
+0.09 C
1936
5.8 C
+0.48 C
1937
6.4 C
+1.12 C
1938
6.6 C
+1.30 C
1939
5.8 C
+0.53 C
1940
5.0 C
-0.26 C
1941
6.4 C
+1.07 C
1942
6.3 C
+1.00 C
1943
4.8 C
-0.47 C
1944
5.5 C
+0.16 C
1945
6.1 C
+0.76 C
1946
6.3 C
+1.02 C
1947
6.0 C
+0.66 C
1948
5.7 C
+0.44 C
1949
6.9 C
+1.65 C
1950
5.3 C
-0.01 C
1951
5.6 C
+0.33 C
1952
5.6 C
+0.33 C
1953
6.8 C
+1.49 C
1954
5.2 C
-0.13 C
1955
5.2 C
-0.10 C
1956
4.4 C
-0.94 C
1957
5.6 C
+0.33 C
1958
4.6 C
-0.74 C
1959
5.7 C
+0.45 C
1960
5.1 C
-0.18 C
1961
5.3 C
0.00 C
1962
3.9 C
-1.41 C
1963
3.8 C
-1.48 C
1964
4.2 C
-1.10 C
1965
4.7 C
-0.57 C
1966
5.2 C
-0.14 C
1967
4.8 C
-0.50 C
1968
4.9 C
-0.44 C
1969
5.3 C
+0.03 C
1970
5.1 C
-0.23 C
1971
4.9 C
-0.41 C
1972
4.5 C
-0.78 C
1973
6.6 C
+1.27 C
1974
5.1 C
-0.15 C
1975
5.8 C
+0.51 C
1976
4.7 C
-0.60 C
1977
5.6 C
+0.28 C
1978
4.3 C
-1.03 C
1979
5.3 C
-0.04 C
1980
4.2 C
-1.05 C
1981
5.2 C
-0.05 C
1982
4.5 C
-0.80 C
1983
5.5 C
+0.24 C
1984
5.3 C
-0.03 C
1985
4.6 C
-0.67 C
1986
4.9 C
-0.44 C
1987
5.0 C
-0.26 C
1988
4.7 C
-0.59 C
1989
4.4 C
-0.93 C
1990
6.0 C
+0.72 C
1991
5.6 C
+0.31 C
1992
4.2 C
-1.09 C
1993
4.7 C
-0.60 C
1994
4.5 C
-0.80 C
1995
5.1 C
-0.16 C
1996
5.2 C
-0.06 C
1997
4.4 C
-0.92 C
1998
6.9 C
+1.62 C
1999
6.2 C
+0.92 C
The fitted trend in annual mean temperature here over 1896 to 1999 is -0.04 C (-0.09 to 0.01) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.07 F (-0.16 to 0.02) per decade. The slope is a straight line fitted to 95 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Chelsea
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.04 C (-0.09 to 0.01) per decade
-0.07 F (-0.16 to 0.02) per decade
1896 to 1999
95
Not clearly different from zero
Mean daily maximum
0.12 C (0.05 to 0.18) per decade
0.2 F (0.1 to 0.3) per decade
1896 to 1999
95
Rise
Mean daily minimum
-0.2 C (-0.2 to -0.1) per decade
-0.3 F (-0.4 to -0.2) per decade
1896 to 1999
95
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
1893 to 2000
Yearly extremes at Chelsea: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
37.8 C (100.0 F)
1937
33.6 C (92.5 F)
106
Coldest night (TNn)
-43.9 C (-47.0 F)
1943
-32.2 C (-26.0 F)
106
Wettest day (Rx1day)
119.6 mm (4.7 in)
1999
49.5 mm (1.9 in)
107
Wettest five days (Rx5day)
155.2 mm (6.1 in)
1999
72.9 mm (2.9 in)
107
Longest dry spell (CDD)
41 days
1903
16 days
107
Hottest day (TXx)
The hottest day of the year at Chelsea, 1893 to 2000. The record is 37.8 C (100.0 F) in 1937, marked on the chart; the median year is 33.6 C (92.5 F).
Hottest day (TXx) at Chelsea by year
Year
Hottest day (TXx)
1893
n/a
1895
18.9 C (66.0 F)
1896
30.6 C (87.1 F)
1897
33.3 C (91.9 F)
1898
32.2 C (90.0 F)
1899
32.2 C (90.0 F)
1900
31.1 C (88.0 F)
1901
36.1 C (97.0 F)
1902
28.9 C (84.0 F)
1903
30.6 C (87.1 F)
1904
30.6 C (87.1 F)
1905
30.0 C (86.0 F)
1906
31.1 C (88.0 F)
1907
30.6 C (87.1 F)
1908
32.2 C (90.0 F)
1909
31.1 C (88.0 F)
1910
31.7 C (89.1 F)
1911
36.1 C (97.0 F)
1912
35.6 C (96.1 F)
1913
36.7 C (98.1 F)
1914
33.9 C (93.0 F)
1915
31.7 C (89.1 F)
1916
36.7 C (98.1 F)
1917
35.0 C (95.0 F)
1918
34.4 C (93.9 F)
1919
35.0 C (95.0 F)
1920
36.1 C (97.0 F)
1921
35.0 C (95.0 F)
1922
32.2 C (90.0 F)
1923
33.9 C (93.0 F)
1924
31.7 C (89.1 F)
1925
34.4 C (93.9 F)
1926
36.7 C (98.1 F)
1927
32.2 C (90.0 F)
1928
32.2 C (90.0 F)
1929
33.3 C (91.9 F)
1930
31.7 C (89.1 F)
1931
36.1 C (97.0 F)
1932
32.2 C (90.0 F)
1933
36.7 C (98.1 F)
1934
32.2 C (90.0 F)
1935
35.6 C (96.1 F)
1936
33.9 C (93.0 F)
1937
37.8 C (100.0 F)
1938
33.9 C (93.0 F)
1939
33.9 C (93.0 F)
1940
33.9 C (93.0 F)
1941
35.0 C (95.0 F)
1942
33.3 C (91.9 F)
1943
31.7 C (89.1 F)
1944
35.0 C (95.0 F)
1945
33.3 C (91.9 F)
1946
33.9 C (93.0 F)
1947
35.6 C (96.1 F)
1948
36.7 C (98.1 F)
1949
34.4 C (93.9 F)
1950
32.2 C (90.0 F)
1951
31.7 C (89.1 F)
1952
35.6 C (96.1 F)
1953
36.7 C (98.1 F)
1954
34.4 C (93.9 F)
1955
35.6 C (96.1 F)
1956
35.0 C (95.0 F)
1957
35.0 C (95.0 F)
1958
32.2 C (90.0 F)
1959
35.6 C (96.1 F)
1960
32.8 C (91.0 F)
1961
32.2 C (90.0 F)
1962
32.8 C (91.0 F)
1963
33.9 C (93.0 F)
1964
33.9 C (93.0 F)
1965
35.0 C (95.0 F)
1966
35.0 C (95.0 F)
1967
31.7 C (89.1 F)
1968
33.9 C (93.0 F)
1969
34.4 C (93.9 F)
1970
33.9 C (93.0 F)
1971
35.0 C (95.0 F)
1972
32.2 C (90.0 F)
1973
34.4 C (93.9 F)
1974
33.3 C (91.9 F)
1975
37.2 C (99.0 F)
1976
32.2 C (90.0 F)
1977
36.7 C (98.1 F)
1978
33.9 C (93.0 F)
1979
33.3 C (91.9 F)
1980
32.2 C (90.0 F)
1981
33.9 C (93.0 F)
1982
32.8 C (91.0 F)
1983
33.3 C (91.9 F)
1984
32.2 C (90.0 F)
1985
31.7 C (89.1 F)
1986
31.7 C (89.1 F)
1987
33.3 C (91.9 F)
1988
35.6 C (96.1 F)
1989
33.3 C (91.9 F)
1990
32.2 C (90.0 F)
1991
34.4 C (93.9 F)
1992
30.6 C (87.1 F)
1993
32.8 C (91.0 F)
1994
35.0 C (95.0 F)
1995
34.4 C (93.9 F)
1996
31.7 C (89.1 F)
1997
30.6 C (87.1 F)
1998
32.2 C (90.0 F)
1999
35.6 C (96.1 F)
2000
12.2 C (54.0 F)
Coldest night (TNn)
The coldest night of the year at Chelsea, 1893 to 2000. The record is -43.9 C (-47.0 F) in 1943, marked on the chart; the median year is -32.2 C (-26.0 F).
Coldest night (TNn) at Chelsea by year
Year
Coldest night (TNn)
1893
n/a
1895
-23.3 C (-9.9 F)
1896
-32.8 C (-27.0 F)
1897
-28.3 C (-18.9 F)
1898
-28.3 C (-18.9 F)
1899
-28.3 C (-18.9 F)
1900
-27.8 C (-18.0 F)
1901
-30.0 C (-22.0 F)
1902
-28.9 C (-20.0 F)
1903
-30.6 C (-23.1 F)
1904
-30.0 C (-22.0 F)
1905
-26.7 C (-16.1 F)
1906
-28.9 C (-20.0 F)
1907
-31.1 C (-24.0 F)
1908
-30.0 C (-22.0 F)
1909
-27.8 C (-18.0 F)
1910
-31.7 C (-25.1 F)
1911
-31.1 C (-24.0 F)
1912
-34.4 C (-29.9 F)
1913
-30.0 C (-22.0 F)
1914
-36.7 C (-34.1 F)
1915
-33.3 C (-27.9 F)
1916
-32.2 C (-26.0 F)
1917
-40.0 C (-40.0 F)
1918
-37.2 C (-35.0 F)
1919
-32.2 C (-26.0 F)
1920
-37.2 C (-35.0 F)
1921
-32.2 C (-26.0 F)
1922
-35.0 C (-31.0 F)
1923
-31.7 C (-25.1 F)
1924
-34.4 C (-29.9 F)
1925
-35.6 C (-32.1 F)
1926
-30.0 C (-22.0 F)
1927
-32.2 C (-26.0 F)
1928
-32.8 C (-27.0 F)
1929
-31.7 C (-25.1 F)
1930
-33.3 C (-27.9 F)
1931
-30.6 C (-23.1 F)
1932
-30.6 C (-23.1 F)
1933
-37.2 C (-35.0 F)
1934
-34.4 C (-29.9 F)
1935
-34.4 C (-29.9 F)
1936
-30.6 C (-23.1 F)
1937
-21.7 C (-7.1 F)
1938
-32.2 C (-26.0 F)
1939
-33.9 C (-29.0 F)
1940
-35.0 C (-31.0 F)
1941
-31.1 C (-24.0 F)
1942
-34.4 C (-29.9 F)
1943
-43.9 C (-47.0 F)
1944
-32.2 C (-26.0 F)
1945
-30.6 C (-23.1 F)
1946
-31.1 C (-24.0 F)
1947
-27.8 C (-18.0 F)
1948
-37.2 C (-35.0 F)
1949
-30.6 C (-23.1 F)
1950
-35.6 C (-32.1 F)
1951
-34.4 C (-29.9 F)
1952
-28.9 C (-20.0 F)
1953
-25.6 C (-14.1 F)
1954
-33.9 C (-29.0 F)
1955
-34.4 C (-29.9 F)
1956
-32.2 C (-26.0 F)
1957
-38.3 C (-36.9 F)
1958
-34.4 C (-29.9 F)
1959
-33.3 C (-27.9 F)
1960
-32.8 C (-27.0 F)
1961
-33.3 C (-27.9 F)
1962
-36.7 C (-34.1 F)
1963
-33.9 C (-29.0 F)
1964
-33.3 C (-27.9 F)
1965
-33.9 C (-29.0 F)
1966
-31.7 C (-25.1 F)
1967
-36.7 C (-34.1 F)
1968
-36.7 C (-34.1 F)
1969
-30.6 C (-23.1 F)
1970
-32.2 C (-26.0 F)
1971
-35.6 C (-32.1 F)
1972
-31.7 C (-25.1 F)
1973
-32.2 C (-26.0 F)
1974
-32.2 C (-26.0 F)
1975
-31.7 C (-25.1 F)
1976
-35.0 C (-31.0 F)
1977
-33.3 C (-27.9 F)
1978
-31.1 C (-24.0 F)
1979
-36.7 C (-34.1 F)
1980
-35.6 C (-32.1 F)
1981
-35.0 C (-31.0 F)
1982
-33.9 C (-29.0 F)
1983
-32.2 C (-26.0 F)
1984
-34.4 C (-29.9 F)
1985
-31.1 C (-24.0 F)
1986
-28.9 C (-20.0 F)
1987
-33.3 C (-27.9 F)
1988
-32.2 C (-26.0 F)
1989
-32.8 C (-27.0 F)
1990
-25.6 C (-14.1 F)
1991
-27.8 C (-18.0 F)
1992
-28.3 C (-18.9 F)
1993
-35.6 C (-32.1 F)
1994
-37.8 C (-36.0 F)
1995
-31.7 C (-25.1 F)
1996
-31.7 C (-25.1 F)
1997
-33.3 C (-27.9 F)
1998
-28.9 C (-20.0 F)
1999
-30.0 C (-22.0 F)
2000
-27.2 C (-17.0 F)
Wettest day (Rx1day)
The wettest day of the year at Chelsea, 1893 to 2000. The record is 119.6 mm (4.7 in) in 1999, marked on the chart; the median year is 49.5 mm (1.9 in).
Wettest day (Rx1day) at Chelsea by year
Year
Wettest day (Rx1day)
1893
32.5 mm (1.3 in)
1895
42.4 mm (1.7 in)
1896
44.5 mm (1.8 in)
1897
94.5 mm (3.7 in)
1898
45.5 mm (1.8 in)
1899
31.5 mm (1.2 in)
1900
47.2 mm (1.9 in)
1901
45.7 mm (1.8 in)
1902
57.2 mm (2.3 in)
1903
39.9 mm (1.6 in)
1904
62.5 mm (2.5 in)
1905
58.4 mm (2.3 in)
1906
64.5 mm (2.5 in)
1907
50.8 mm (2.0 in)
1908
48.3 mm (1.9 in)
1909
40.6 mm (1.6 in)
1910
38.1 mm (1.5 in)
1911
86.4 mm (3.4 in)
1912
31.2 mm (1.2 in)
1913
50.3 mm (2.0 in)
1914
58.4 mm (2.3 in)
1915
36.1 mm (1.4 in)
1916
55.4 mm (2.2 in)
1917
45.5 mm (1.8 in)
1918
45.7 mm (1.8 in)
1919
63.5 mm (2.5 in)
1920
45.7 mm (1.8 in)
1921
31.0 mm (1.2 in)
1922
79.2 mm (3.1 in)
1923
90.2 mm (3.6 in)
1924
57.9 mm (2.3 in)
1925
39.4 mm (1.6 in)
1926
52.8 mm (2.1 in)
1927
114.8 mm (4.5 in)
1928
42.7 mm (1.7 in)
1929
40.6 mm (1.6 in)
1930
36.8 mm (1.4 in)
1931
59.2 mm (2.3 in)
1932
45.0 mm (1.8 in)
1933
51.1 mm (2.0 in)
1934
43.7 mm (1.7 in)
1935
43.9 mm (1.7 in)
1936
40.6 mm (1.6 in)
1937
64.5 mm (2.5 in)
1938
74.4 mm (2.9 in)
1939
33.0 mm (1.3 in)
1940
44.2 mm (1.7 in)
1941
53.8 mm (2.1 in)
1942
70.4 mm (2.8 in)
1943
52.1 mm (2.1 in)
1944
41.1 mm (1.6 in)
1945
41.7 mm (1.6 in)
1946
52.3 mm (2.1 in)
1947
75.9 mm (3.0 in)
1948
70.4 mm (2.8 in)
1949
45.2 mm (1.8 in)
1950
55.9 mm (2.2 in)
1951
33.8 mm (1.3 in)
1952
77.5 mm (3.1 in)
1953
55.1 mm (2.2 in)
1954
45.5 mm (1.8 in)
1955
58.7 mm (2.3 in)
1956
36.1 mm (1.4 in)
1957
35.6 mm (1.4 in)
1958
42.7 mm (1.7 in)
1959
49.5 mm (1.9 in)
1960
71.9 mm (2.8 in)
1961
48.3 mm (1.9 in)
1962
61.2 mm (2.4 in)
1963
44.2 mm (1.7 in)
1964
61.5 mm (2.4 in)
1965
43.4 mm (1.7 in)
1966
53.8 mm (2.1 in)
1967
40.6 mm (1.6 in)
1968
45.0 mm (1.8 in)
1969
56.1 mm (2.2 in)
1970
50.8 mm (2.0 in)
1971
41.1 mm (1.6 in)
1972
40.6 mm (1.6 in)
1973
84.3 mm (3.3 in)
1974
51.8 mm (2.0 in)
1975
43.9 mm (1.7 in)
1976
48.8 mm (1.9 in)
1977
52.6 mm (2.1 in)
1978
40.6 mm (1.6 in)
1979
38.1 mm (1.5 in)
1980
30.2 mm (1.2 in)
1981
58.7 mm (2.3 in)
1982
54.6 mm (2.1 in)
1983
60.7 mm (2.4 in)
1984
54.9 mm (2.2 in)
1985
47.0 mm (1.9 in)
1986
54.1 mm (2.1 in)
1987
65.3 mm (2.6 in)
1988
56.9 mm (2.2 in)
1989
55.9 mm (2.2 in)
1990
60.5 mm (2.4 in)
1991
42.7 mm (1.7 in)
1992
42.4 mm (1.7 in)
1993
67.3 mm (2.6 in)
1994
42.2 mm (1.7 in)
1995
54.9 mm (2.2 in)
1996
65.5 mm (2.6 in)
1997
47.0 mm (1.9 in)
1998
64.8 mm (2.6 in)
1999
119.6 mm (4.7 in)
2000
23.6 mm (0.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Chelsea, 1893 to 2000. The record is 155.2 mm (6.1 in) in 1999, marked on the chart; the median year is 72.9 mm (2.9 in).
Wettest five days (Rx5day) at Chelsea by year
Year
Wettest five days (Rx5day)
1893
57.1 mm (2.2 in)
1895
70.6 mm (2.8 in)
1896
88.2 mm (3.5 in)
1897
94.5 mm (3.7 in)
1898
75.4 mm (3.0 in)
1899
59.7 mm (2.4 in)
1900
80.0 mm (3.1 in)
1901
70.3 mm (2.8 in)
1902
81.2 mm (3.2 in)
1903
68.1 mm (2.7 in)
1904
68.9 mm (2.7 in)
1905
71.1 mm (2.8 in)
1906
80.2 mm (3.2 in)
1907
80.1 mm (3.2 in)
1908
63.5 mm (2.5 in)
1909
69.9 mm (2.8 in)
1910
63.0 mm (2.5 in)
1911
93.0 mm (3.7 in)
1912
71.2 mm (2.8 in)
1913
91.9 mm (3.6 in)
1914
60.4 mm (2.4 in)
1915
48.7 mm (1.9 in)
1916
68.6 mm (2.7 in)
1917
69.8 mm (2.7 in)
1918
59.8 mm (2.4 in)
1919
111.8 mm (4.4 in)
1920
88.2 mm (3.5 in)
1921
58.7 mm (2.3 in)
1922
109.2 mm (4.3 in)
1923
91.7 mm (3.6 in)
1924
72.9 mm (2.9 in)
1925
94.7 mm (3.7 in)
1926
68.0 mm (2.7 in)
1927
80.6 mm (3.2 in)
1928
72.7 mm (2.9 in)
1929
65.7 mm (2.6 in)
1930
53.6 mm (2.1 in)
1931
82.5 mm (3.2 in)
1932
73.2 mm (2.9 in)
1933
58.0 mm (2.3 in)
1934
60.7 mm (2.4 in)
1935
56.1 mm (2.2 in)
1936
73.2 mm (2.9 in)
1937
91.8 mm (3.6 in)
1938
126.8 mm (5.0 in)
1939
57.2 mm (2.3 in)
1940
73.4 mm (2.9 in)
1941
64.7 mm (2.5 in)
1942
108.5 mm (4.3 in)
1943
79.3 mm (3.1 in)
1944
59.9 mm (2.4 in)
1945
94.0 mm (3.7 in)
1946
71.1 mm (2.8 in)
1947
106.4 mm (4.2 in)
1948
89.5 mm (3.5 in)
1949
70.4 mm (2.8 in)
1950
68.3 mm (2.7 in)
1951
54.3 mm (2.1 in)
1952
98.8 mm (3.9 in)
1953
59.2 mm (2.3 in)
1954
63.7 mm (2.5 in)
1955
113.6 mm (4.5 in)
1956
66.7 mm (2.6 in)
1957
79.6 mm (3.1 in)
1958
74.5 mm (2.9 in)
1959
85.0 mm (3.3 in)
1960
105.4 mm (4.1 in)
1961
48.6 mm (1.9 in)
1962
112.2 mm (4.4 in)
1963
64.2 mm (2.5 in)
1964
96.0 mm (3.8 in)
1965
54.1 mm (2.1 in)
1966
56.9 mm (2.2 in)
1967
44.9 mm (1.8 in)
1968
55.9 mm (2.2 in)
1969
102.1 mm (4.0 in)
1970
54.4 mm (2.1 in)
1971
76.2 mm (3.0 in)
1972
70.5 mm (2.8 in)
1973
140.7 mm (5.5 in)
1974
66.5 mm (2.6 in)
1975
76.0 mm (3.0 in)
1976
76.9 mm (3.0 in)
1977
71.1 mm (2.8 in)
1978
59.2 mm (2.3 in)
1979
77.8 mm (3.1 in)
1980
43.4 mm (1.7 in)
1981
100.3 mm (3.9 in)
1982
54.9 mm (2.2 in)
1983
81.4 mm (3.2 in)
1984
116.9 mm (4.6 in)
1985
64.5 mm (2.5 in)
1986
85.6 mm (3.4 in)
1987
96.0 mm (3.8 in)
1988
78.4 mm (3.1 in)
1989
81.0 mm (3.2 in)
1990
101.2 mm (4.0 in)
1991
65.3 mm (2.6 in)
1992
51.3 mm (2.0 in)
1993
114.8 mm (4.5 in)
1994
95.5 mm (3.8 in)
1995
64.5 mm (2.5 in)
1996
108.7 mm (4.3 in)
1997
65.3 mm (2.6 in)
1998
91.1 mm (3.6 in)
1999
155.2 mm (6.1 in)
2000
35.8 mm (1.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Chelsea, 1893 to 2000. The record is 41 days in 1903, marked on the chart; the median year is 16 days.
Longest dry spell (CDD) at Chelsea by year
Year
Longest dry spell (CDD)
1893
9 days
1895
15 days
1896
36 days
1897
17 days
1898
14 days
1899
16 days
1900
16 days
1901
18 days
1902
15 days
1903
41 days
1904
20 days
1905
19 days
1906
16 days
1907
13 days
1908
24 days
1909
13 days
1910
16 days
1911
20 days
1912
19 days
1913
23 days
1914
18 days
1915
22 days
1916
16 days
1917
19 days
1918
24 days
1919
18 days
1920
13 days
1921
20 days
1922
19 days
1923
17 days
1924
26 days
1925
18 days
1926
22 days
1927
16 days
1928
17 days
1929
11 days
1930
10 days
1931
12 days
1932
19 days
1933
17 days
1934
16 days
1935
15 days
1936
12 days
1937
15 days
1938
22 days
1939
25 days
1940
21 days
1941
19 days
1942
18 days
1943
15 days
1944
18 days
1945
17 days
1946
23 days
1947
28 days
1948
14 days
1949
14 days
1950
15 days
1951
12 days
1952
15 days
1953
18 days
1954
13 days
1955
12 days
1956
23 days
1957
16 days
1958
10 days
1959
17 days
1960
10 days
1961
18 days
1962
13 days
1963
19 days
1964
15 days
1965
20 days
1966
16 days
1967
12 days
1968
16 days
1969
15 days
1970
18 days
1971
15 days
1972
11 days
1973
14 days
1974
12 days
1975
14 days
1976
11 days
1977
17 days
1978
23 days
1979
15 days
1980
23 days
1981
15 days
1982
15 days
1983
16 days
1984
15 days
1985
14 days
1986
13 days
1987
20 days
1988
16 days
1989
15 days
1990
16 days
1991
21 days
1992
12 days
1993
10 days
1994
14 days
1995
25 days
1996
10 days
1997
14 days
1998
13 days
1999
13 days
2000
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
95 years with a frost
Across 95 years with a frost, the median last spring frost at Chelsea falls on 2 June and the median first autumn frost on 12 September, which leaves a median of 102 days between them.
In 1970 to 1999 the median growing season was 105 days. That is 6 days fewer than in 1896 to 1934.
Fitted over all years, the growing season changes by -1.8 days per decade at this station.
Frost dates and growing season at Chelsea
Measure
Median, all years
Earliest period (1896 to 1934)
Recent period (1970 to 1999)
Recent against earliest
Fitted trend
Last spring frost
2 June
31 May
4 June
4 days later
+1.1 days per decade
First autumn frost
12 September
19 September
11 September
8 days earlier
-0.7 days per decade
Growing days
102 days
111 days
105 days
6 days fewer
-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
95 years, 1896 to 1999
A day with at least 50.7 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 110.9 mm (4.4 in) of rain is expected about once in 100 years.
Rainfall return levels at Chelsea: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
50.7 mm (2.0 in)
5 years
64.4 mm (2.5 in)
10 years
74.3 mm (2.9 in)
25 years
88.0 mm (3.5 in)
50 years
99.1 mm (3.9 in)
100 years
110.9 mm (4.4 in)
Longer than the 95 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, 95 years of values from 1896 to 1999.
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: 119.6 mm (4.7 in) in 1999; 114.8 mm (4.5 in) in 1927; 94.5 mm (3.7 in) in 1897.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Chelsea standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Chelsea 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.