Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at St Thomas. 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 St Thomas, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
16.7 C (62.1 F)
-33.9 C (-29.0 F)
n/a
n/a
Feb
16.1 C (61.0 F)
-34.4 C (-29.9 F)
n/a
n/a
Mar
26.1 C (79.0 F)
-26.5 C (-15.7 F)
n/a
n/a
Apr
29.4 C (84.9 F)
-12.8 C (9.0 F)
n/a
n/a
May
32.2 C (90.0 F)
-5.6 C (21.9 F)
n/a
n/a
Jun
35.6 C (96.1 F)
-2.2 C (28.0 F)
n/a
n/a
Jul
38.9 C (102.0 F)
3.3 C (37.9 F)
n/a
n/a
Aug
36.1 C (97.0 F)
1.7 C (35.1 F)
n/a
n/a
Sep
35.6 C (96.1 F)
-2.8 C (27.0 F)
n/a
n/a
Oct
30.0 C (86.0 F)
-8.3 C (17.1 F)
n/a
n/a
Nov
23.3 C (73.9 F)
-17.8 C (0.0 F)
n/a
n/a
Dec
17.2 C (63.0 F)
-30.6 C (-23.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at St Thomas still stand. 1934 holds the most, with 54.
Standing records at St Thomas by the year they were set
Year set
Standing records
1925
10
1926
39
1927
35
1928
34
1929
39
1930
35
1931
34
1932
29
1933
37
1934
54
1935
27
1936
42
1937
22
1938
28
1939
17
1940
26
1941
31
1942
29
1943
27
1944
22
1945
39
1946
32
1947
29
1948
15
1949
29
1950
21
1951
35
1952
15
1953
16
1954
23
1955
34
1956
25
1957
27
1958
12
1959
26
1960
16
1961
14
1962
28
1963
31
1964
19
1965
25
1966
24
1967
33
1968
17
1969
16
1970
22
1971
23
1972
21
1973
22
1974
18
1975
20
1976
24
1977
40
1978
16
1979
34
1980
6
All-Time Record Progression
5 new records
5 all-time records were set at St Thomas between 29 March 1954 and 26 January 1978. Each dot is a new record.
When St Thomas set new all-time records
Date
Kind
Detail
1954-03-29
Record daily snowfall
Record daily snowfall 27.9 cm (11.0 in)
1955-03-26
Record daily snowfall
Record daily snowfall 29.2 cm (11.5 in)
1964-08-22
Record daily precipitation
Record daily precipitation 86.9 mm (3.4 in)
1968-06-25
Record daily precipitation
Record daily precipitation 104.6 mm (4.1 in)
1978-01-26
Record daily snowfall
Record daily snowfall 31.8 cm (12.5 in)
Wettest Day of Each Month
Jun: 104.6 mm (4.1 in)
The wettest day on record for each calendar month at St Thomas. The most was 104.6 mm (4.1 in) on 25 June 1968.
Record daily precipitation for each month at St Thomas
Month
Record daily precipitation (mm)
Date
Jan
61.2 mm (2.4 in)
13 January 1968
Feb
85.6 mm (3.4 in)
19 February 1939
Mar
47.8 mm (1.9 in)
12 March 1977
Apr
67.8 mm (2.7 in)
26 April 1937
May
72.4 mm (2.9 in)
26 May 1932
Jun
104.6 mm (4.1 in)
25 June 1968
Jul
47.0 mm (1.9 in)
31 July 1938
Aug
86.9 mm (3.4 in)
22 August 1964
Sep
82.3 mm (3.2 in)
23 September 1926
Oct
71.9 mm (2.8 in)
1 October 1945
Nov
48.3 mm (1.9 in)
27 November 1887
Dec
46.2 mm (1.8 in)
21 December 1967
Period of Record Coverage
1925 to 1980
Complete yearUnder 90 percent of days
56 years of record at St Thomas, 1925 to 1980. 2 years have data for under 90 percent of days and are left out of rankings: 1925, 1980.
Cooler than the station meanWarmer than the station mean
One stripe for each of 53 complete years at St Thomas, 1926 to 1978. Blue stripes are years cooler than the station's own mean of 7.8 C (46.1 F); red stripes are warmer. The coolest year was 1926, at 6.5 C (43.6 F), and the warmest was 1949, at 9.2 C (48.6 F). The strongest colour marks a difference of 1.4 C (2.5 F).
Annual mean temperature at St Thomas as warming stripes, 1926 to 1978
Year
Annual mean temperature
Difference from the station mean
1926
6.5 C
-1.35 C
1927
8.0 C
+0.15 C
1928
7.6 C
-0.19 C
1929
7.1 C
-0.75 C
1930
7.7 C
-0.14 C
1931
9.2 C
+1.37 C
1932
8.2 C
+0.41 C
1933
8.5 C
+0.67 C
1934
7.3 C
-0.49 C
1935
7.2 C
-0.63 C
1936
7.5 C
-0.37 C
1937
8.0 C
+0.17 C
1938
8.8 C
+0.96 C
1939
8.4 C
+0.54 C
1940
7.0 C
-0.78 C
1941
8.9 C
+1.11 C
1942
8.3 C
+0.48 C
1943
7.4 C
-0.46 C
1944
8.3 C
+0.47 C
1945
7.7 C
-0.12 C
1946
9.0 C
+1.15 C
1947
8.1 C
+0.24 C
1948
8.0 C
+0.21 C
1949
9.2 C
+1.40 C
1950
7.5 C
-0.30 C
1951
7.7 C
-0.15 C
1952
8.5 C
+0.64 C
1953
8.9 C
+1.10 C
1954
8.1 C
+0.25 C
1955
8.8 C
+0.98 C
1956
7.7 C
-0.08 C
1957
7.9 C
+0.12 C
1958
7.2 C
-0.61 C
1959
8.1 C
+0.32 C
1960
7.4 C
-0.40 C
1961
8.1 C
+0.23 C
1962
7.4 C
-0.38 C
1963
6.8 C
-0.99 C
1964
7.9 C
+0.08 C
1965
7.4 C
-0.42 C
1966
7.0 C
-0.87 C
1967
6.9 C
-0.90 C
1968
7.4 C
-0.46 C
1969
7.5 C
-0.35 C
1970
7.5 C
-0.30 C
1971
8.0 C
+0.18 C
1972
6.9 C
-0.94 C
1973
8.8 C
+0.95 C
1974
7.5 C
-0.29 C
1975
8.3 C
+0.52 C
1976
7.1 C
-0.68 C
1977
7.9 C
+0.05 C
1978
6.7 C
-1.17 C
The fitted trend in annual mean temperature here over 1926 to 1978 is -0.09 C (-0.21 to 0.03) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.2 F (-0.4 to 0.1) per decade. The slope is a straight line fitted to 53 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at St Thomas
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.09 C (-0.21 to 0.03) per decade
-0.2 F (-0.4 to 0.1) per decade
1926 to 1978
53
Not clearly different from zero
Mean daily maximum
-0.3 C (-0.4 to -0.2) per decade
-0.6 F (-0.8 to -0.3) per decade
1926 to 1978
53
Fall
Mean daily minimum
0.14 C (0.01 to 0.27) per decade
0.25 F (0.02 to 0.48) per decade
1926 to 1978
53
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
1882 to 1980
Yearly extremes at St Thomas: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
38.9 C (102.0 F)
1936
33.1 C (91.5 F)
56
Coldest night (TNn)
-34.4 C (-29.9 F)
1929
-25.5 C (-14.0 F)
56
Wettest day (Rx1day)
104.6 mm (4.1 in)
1968
44.1 mm (1.7 in)
68
Wettest five days (Rx5day)
122.8 mm (4.8 in)
1954
66.1 mm (2.6 in)
68
Longest dry spell (CDD)
32 days
1943
17 days
68
Hottest day (TXx)
The hottest day of the year at St Thomas, 1882 to 1980. The record is 38.9 C (102.0 F) in 1936, marked on the chart; the median year is 33.1 C (91.5 F).
Hottest day (TXx) at St Thomas by year
Year
Hottest day (TXx)
1882
n/a
1883
n/a
1884
n/a
1885
n/a
1886
n/a
1887
n/a
1888
n/a
1890
n/a
1891
n/a
1892
n/a
1893
n/a
1894
n/a
1895
n/a
1925
20.0 C (68.0 F)
1926
36.7 C (98.1 F)
1927
33.3 C (91.9 F)
1928
31.7 C (89.1 F)
1929
32.8 C (91.0 F)
1930
36.1 C (97.0 F)
1931
36.1 C (97.0 F)
1932
33.3 C (91.9 F)
1933
36.1 C (97.0 F)
1934
35.0 C (95.0 F)
1935
33.3 C (91.9 F)
1936
38.9 C (102.0 F)
1937
33.3 C (91.9 F)
1938
31.1 C (88.0 F)
1939
33.3 C (91.9 F)
1940
33.3 C (91.9 F)
1941
35.0 C (95.0 F)
1942
35.0 C (95.0 F)
1943
32.8 C (91.0 F)
1944
33.3 C (91.9 F)
1945
32.8 C (91.0 F)
1946
31.7 C (89.1 F)
1947
33.3 C (91.9 F)
1948
35.0 C (95.0 F)
1949
36.7 C (98.1 F)
1950
30.6 C (87.1 F)
1951
30.6 C (87.1 F)
1952
35.6 C (96.1 F)
1953
35.6 C (96.1 F)
1954
35.0 C (95.0 F)
1955
37.2 C (99.0 F)
1956
32.8 C (91.0 F)
1957
32.8 C (91.0 F)
1958
31.1 C (88.0 F)
1959
32.8 C (91.0 F)
1960
31.1 C (88.0 F)
1961
31.1 C (88.0 F)
1962
32.2 C (90.0 F)
1963
31.7 C (89.1 F)
1964
33.3 C (91.9 F)
1965
32.2 C (90.0 F)
1966
35.0 C (95.0 F)
1967
31.1 C (88.0 F)
1968
32.8 C (91.0 F)
1969
31.7 C (89.1 F)
1970
31.1 C (88.0 F)
1971
34.4 C (93.9 F)
1972
31.1 C (88.0 F)
1973
33.3 C (91.9 F)
1974
32.2 C (90.0 F)
1975
33.9 C (93.0 F)
1976
31.1 C (88.0 F)
1977
35.0 C (95.0 F)
1978
32.5 C (90.5 F)
1979
31.0 C (87.8 F)
1980
19.0 C (66.2 F)
Coldest night (TNn)
The coldest night of the year at St Thomas, 1882 to 1980. The record is -34.4 C (-29.9 F) in 1929, marked on the chart; the median year is -25.5 C (-14.0 F).
Coldest night (TNn) at St Thomas by year
Year
Coldest night (TNn)
1882
n/a
1883
n/a
1884
n/a
1885
n/a
1886
n/a
1887
n/a
1888
n/a
1890
n/a
1891
n/a
1892
n/a
1893
n/a
1894
n/a
1895
n/a
1925
-23.3 C (-9.9 F)
1926
-26.7 C (-16.1 F)
1927
-30.6 C (-23.1 F)
1928
-32.2 C (-26.0 F)
1929
-34.4 C (-29.9 F)
1930
-26.1 C (-15.0 F)
1931
-17.8 C (0.0 F)
1932
-18.3 C (-0.9 F)
1933
-23.3 C (-9.9 F)
1934
-32.8 C (-27.0 F)
1935
-26.7 C (-16.1 F)
1936
-29.4 C (-20.9 F)
1937
-21.1 C (-6.0 F)
1938
-20.6 C (-5.1 F)
1939
-21.1 C (-6.0 F)
1940
-26.7 C (-16.1 F)
1941
-19.4 C (-2.9 F)
1942
-25.6 C (-14.1 F)
1943
-26.7 C (-16.1 F)
1944
-29.4 C (-20.9 F)
1945
-28.9 C (-20.0 F)
1946
-19.4 C (-2.9 F)
1947
-17.2 C (1.0 F)
1948
-30.0 C (-22.0 F)
1949
-18.9 C (-2.0 F)
1950
-21.1 C (-6.0 F)
1951
-26.1 C (-15.0 F)
1952
-17.2 C (1.0 F)
1953
-21.1 C (-6.0 F)
1954
-26.7 C (-16.1 F)
1955
-27.8 C (-18.0 F)
1956
-18.3 C (-0.9 F)
1957
-27.8 C (-18.0 F)
1958
-23.3 C (-9.9 F)
1959
-27.8 C (-18.0 F)
1960
-22.2 C (-8.0 F)
1961
-30.6 C (-23.1 F)
1962
-30.6 C (-23.1 F)
1963
-30.0 C (-22.0 F)
1964
-23.3 C (-9.9 F)
1965
-23.3 C (-9.9 F)
1966
-26.7 C (-16.1 F)
1967
-26.7 C (-16.1 F)
1968
-24.4 C (-11.9 F)
1969
-20.0 C (-4.0 F)
1970
-33.9 C (-29.0 F)
1971
-24.4 C (-11.9 F)
1972
-26.1 C (-15.0 F)
1973
-23.3 C (-9.9 F)
1974
-20.6 C (-5.1 F)
1975
-23.3 C (-9.9 F)
1976
-32.8 C (-27.0 F)
1977
-24.4 C (-11.9 F)
1978
-29.0 C (-20.2 F)
1979
-25.5 C (-13.9 F)
1980
-21.5 C (-6.7 F)
Wettest day (Rx1day)
The wettest day of the year at St Thomas, 1882 to 1980. The record is 104.6 mm (4.1 in) in 1968, marked on the chart; the median year is 44.1 mm (1.7 in).
Wettest day (Rx1day) at St Thomas by year
Year
Wettest day (Rx1day)
1882
50.5 mm (2.0 in)
1883
43.7 mm (1.7 in)
1884
32.5 mm (1.3 in)
1885
54.6 mm (2.1 in)
1886
44.5 mm (1.8 in)
1887
48.3 mm (1.9 in)
1888
n/a
1890
63.5 mm (2.5 in)
1891
52.8 mm (2.1 in)
1892
49.8 mm (2.0 in)
1893
25.4 mm (1.0 in)
1894
47.5 mm (1.9 in)
1895
14.0 mm (0.6 in)
1925
34.3 mm (1.4 in)
1926
82.3 mm (3.2 in)
1927
56.6 mm (2.2 in)
1928
62.2 mm (2.4 in)
1929
39.6 mm (1.6 in)
1930
50.3 mm (2.0 in)
1931
37.6 mm (1.5 in)
1932
72.4 mm (2.9 in)
1933
28.7 mm (1.1 in)
1934
26.2 mm (1.0 in)
1935
63.2 mm (2.5 in)
1936
32.8 mm (1.3 in)
1937
67.8 mm (2.7 in)
1938
56.4 mm (2.2 in)
1939
85.6 mm (3.4 in)
1940
56.9 mm (2.2 in)
1941
26.7 mm (1.1 in)
1942
53.8 mm (2.1 in)
1943
35.6 mm (1.4 in)
1944
33.5 mm (1.3 in)
1945
71.9 mm (2.8 in)
1946
40.1 mm (1.6 in)
1947
55.4 mm (2.2 in)
1948
29.5 mm (1.2 in)
1949
35.1 mm (1.4 in)
1950
32.3 mm (1.3 in)
1951
33.8 mm (1.3 in)
1952
45.0 mm (1.8 in)
1953
33.0 mm (1.3 in)
1954
50.0 mm (2.0 in)
1955
54.1 mm (2.1 in)
1956
60.7 mm (2.4 in)
1957
42.7 mm (1.7 in)
1958
36.3 mm (1.4 in)
1959
35.8 mm (1.4 in)
1960
38.6 mm (1.5 in)
1961
31.8 mm (1.3 in)
1962
42.2 mm (1.7 in)
1963
29.7 mm (1.2 in)
1964
86.9 mm (3.4 in)
1965
50.0 mm (2.0 in)
1966
37.1 mm (1.5 in)
1967
78.5 mm (3.1 in)
1968
104.6 mm (4.1 in)
1969
52.1 mm (2.1 in)
1970
33.0 mm (1.3 in)
1971
30.2 mm (1.2 in)
1972
40.4 mm (1.6 in)
1973
32.8 mm (1.3 in)
1974
27.2 mm (1.1 in)
1975
66.0 mm (2.6 in)
1976
56.1 mm (2.2 in)
1977
50.5 mm (2.0 in)
1978
33.4 mm (1.3 in)
1979
55.4 mm (2.2 in)
1980
28.2 mm (1.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at St Thomas, 1882 to 1980. The record is 122.8 mm (4.8 in) in 1954, marked on the chart; the median year is 66.1 mm (2.6 in).
Wettest five days (Rx5day) at St Thomas by year
Year
Wettest five days (Rx5day)
1882
62.4 mm (2.5 in)
1883
62.0 mm (2.4 in)
1884
57.5 mm (2.3 in)
1885
71.3 mm (2.8 in)
1886
57.2 mm (2.3 in)
1887
63.5 mm (2.5 in)
1888
n/a
1890
68.9 mm (2.7 in)
1891
70.1 mm (2.8 in)
1892
65.5 mm (2.6 in)
1893
44.8 mm (1.8 in)
1894
94.8 mm (3.7 in)
1895
21.1 mm (0.8 in)
1925
42.5 mm (1.7 in)
1926
82.3 mm (3.2 in)
1927
86.3 mm (3.4 in)
1928
71.6 mm (2.8 in)
1929
68.3 mm (2.7 in)
1930
62.2 mm (2.4 in)
1931
61.0 mm (2.4 in)
1932
75.5 mm (3.0 in)
1933
32.3 mm (1.3 in)
1934
40.4 mm (1.6 in)
1935
68.0 mm (2.7 in)
1936
50.8 mm (2.0 in)
1937
111.5 mm (4.4 in)
1938
65.0 mm (2.6 in)
1939
98.3 mm (3.9 in)
1940
65.6 mm (2.6 in)
1941
35.8 mm (1.4 in)
1942
70.7 mm (2.8 in)
1943
51.6 mm (2.0 in)
1944
51.8 mm (2.0 in)
1945
91.7 mm (3.6 in)
1946
66.6 mm (2.6 in)
1947
74.2 mm (2.9 in)
1948
56.9 mm (2.2 in)
1949
48.5 mm (1.9 in)
1950
75.9 mm (3.0 in)
1951
44.7 mm (1.8 in)
1952
90.0 mm (3.5 in)
1953
58.0 mm (2.3 in)
1954
122.8 mm (4.8 in)
1955
66.6 mm (2.6 in)
1956
61.7 mm (2.4 in)
1957
56.0 mm (2.2 in)
1958
64.3 mm (2.5 in)
1959
55.9 mm (2.2 in)
1960
88.1 mm (3.5 in)
1961
61.8 mm (2.4 in)
1962
51.6 mm (2.0 in)
1963
54.0 mm (2.1 in)
1964
119.4 mm (4.7 in)
1965
68.7 mm (2.7 in)
1966
88.9 mm (3.5 in)
1967
86.8 mm (3.4 in)
1968
114.2 mm (4.5 in)
1969
80.9 mm (3.2 in)
1970
54.4 mm (2.1 in)
1971
47.0 mm (1.9 in)
1972
66.5 mm (2.6 in)
1973
69.1 mm (2.7 in)
1974
59.2 mm (2.3 in)
1975
109.2 mm (4.3 in)
1976
82.5 mm (3.2 in)
1977
92.0 mm (3.6 in)
1978
67.8 mm (2.7 in)
1979
86.8 mm (3.4 in)
1980
47.2 mm (1.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at St Thomas, 1882 to 1980. The record is 32 days in 1943, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at St Thomas by year
Year
Longest dry spell (CDD)
1882
16 days
1883
19 days
1884
17 days
1885
19 days
1886
17 days
1887
17 days
1888
n/a
1890
21 days
1891
16 days
1892
10 days
1893
11 days
1894
9 days
1895
18 days
1925
12 days
1926
18 days
1927
16 days
1928
13 days
1929
17 days
1930
19 days
1931
17 days
1932
14 days
1933
19 days
1934
20 days
1935
17 days
1936
21 days
1937
13 days
1938
11 days
1939
14 days
1940
11 days
1941
14 days
1942
21 days
1943
32 days
1944
19 days
1945
10 days
1946
12 days
1947
18 days
1948
18 days
1949
19 days
1950
13 days
1951
12 days
1952
16 days
1953
24 days
1954
13 days
1955
21 days
1956
16 days
1957
22 days
1958
20 days
1959
19 days
1960
13 days
1961
17 days
1962
13 days
1963
26 days
1964
20 days
1965
14 days
1966
18 days
1967
25 days
1968
13 days
1969
18 days
1970
18 days
1971
17 days
1972
13 days
1973
27 days
1974
16 days
1975
15 days
1976
19 days
1977
10 days
1978
25 days
1979
16 days
1980
8 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
53 years with a frost
Across 53 years with a frost, the median last spring frost at St Thomas falls on 14 May and the median first autumn frost on 3 October, which leaves a median of 140 days between them.
Fitted over all years, the growing season changes by +3.0 days per decade at this station.
Frost dates and growing season at St Thomas
Measure
Median, all years
Earliest period
Recent period (1949 to 1978)
Recent against earliest
Fitted trend
Last spring frost
14 May
n/a
14 May
n/a
-1.9 days per decade
First autumn frost
3 October
n/a
4 October
n/a
+1.1 days per decade
Growing days
140 days
n/a
143 days
n/a
+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
60 years, 1883 to 1979
A day with at least 44.7 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 109.4 mm (4.3 in) of rain is expected about once in 100 years.
Rainfall return levels at St Thomas: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
44.7 mm (1.8 in)
5 years
60.3 mm (2.4 in)
10 years
71.2 mm (2.8 in)
25 years
85.9 mm (3.4 in)
50 years
97.4 mm (3.8 in)
100 years
109.4 mm (4.3 in)
Longer than the 60 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, 60 years of values from 1883 to 1979.
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: 104.6 mm (4.1 in) in 1968; 86.9 mm (3.4 in) in 1964; 85.6 mm (3.4 in) in 1939.
Station Changes
3 suspected
3 changes were suspected in the annual mean temperature of St Thomas, at 1941, 1951 and 1974. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1941 ran 0.2 C (0.3 F) higher than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1951 ran 0.3 C (0.5 F) lower than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1974 ran 0.2 C (0.4 F) higher than in the years before (possible change).
Suspected changes in the annual mean temperature at St Thomas, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1941
+0.2
+0.3
likely
5
1951
-0.3
-0.5
likely
5
1974
+0.2
+0.4
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 St Thomas standing records by year: CSV or JSON. Field meanings are on the data page.
Data for St Thomas 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.