Record envelope, standing records and threshold days for Westminster 2 SSE (USC00189435), Maryland, United States, with 87 years of record.
Key Facts for Westminster 2 SSE
Westminster 2 SSE (USC00189435) is a weather station in Maryland, United States at 39.55 latitude and -76.98 longitude, 262 m (860 ft) above sea level.
The station reports from 1893 to 1979, 87 years of record.
1,464 records set at Westminster 2 SSE still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Westminster 2 SSE set a daily record precipitation of 40.4 mm (1.6 in) on 25 January 1979.
About the Station
Location: Maryland, United States, 39.55 latitude, -76.98 longitude.
Elevation: 262 m (860 ft).
Period of record: 1893 to 1979, 87 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 Westminster 2 SSE. 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 Westminster 2 SSE, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
24.4 C (75.9 F)
-25.6 C (-14.1 F)
n/a
n/a
Feb
26.1 C (79.0 F)
-26.7 C (-16.1 F)
n/a
n/a
Mar
30.6 C (87.1 F)
-16.7 C (1.9 F)
n/a
n/a
Apr
34.4 C (93.9 F)
-12.8 C (9.0 F)
n/a
n/a
May
37.2 C (99.0 F)
-2.8 C (27.0 F)
n/a
n/a
Jun
38.9 C (102.0 F)
1.7 C (35.1 F)
n/a
n/a
Jul
39.4 C (102.9 F)
5.6 C (42.1 F)
n/a
n/a
Aug
40.0 C (104.0 F)
5.0 C (41.0 F)
n/a
n/a
Sep
37.8 C (100.0 F)
-1.1 C (30.0 F)
n/a
n/a
Oct
35.0 C (95.0 F)
-7.2 C (19.0 F)
n/a
n/a
Nov
28.3 C (82.9 F)
-13.9 C (7.0 F)
n/a
n/a
Dec
22.8 C (73.0 F)
-23.3 C (-9.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Westminster 2 SSE still stand. 1930 holds the most, with 54.
Standing records at Westminster 2 SSE by the year they were set
Year set
Standing records
1893
6
1895
48
1896
51
1897
17
1898
42
1899
25
1900
44
1901
6
1911
14
1912
15
1913
13
1921
18
1922
20
1923
27
1924
18
1925
33
1926
21
1927
33
1928
32
1929
30
1930
54
1931
21
1932
15
1933
28
1934
29
1935
26
1936
34
1937
12
1938
21
1939
18
1940
31
1941
22
1942
18
1943
22
1944
16
1945
26
1946
26
1947
28
1948
18
1949
13
1950
25
1951
20
1952
15
1953
17
1954
10
1955
19
1956
24
1957
15
1958
10
1959
16
1960
26
1961
10
1962
17
1963
20
1964
24
1965
21
1966
12
1967
15
1968
17
1969
8
1970
12
1971
15
1972
25
1973
11
1974
19
1975
11
1976
17
1977
16
1978
4
1979
2
All-Time Record Progression
2 new records
2 all-time records were set at Westminster 2 SSE between 13 August 1955 and 22 June 1972. Each dot is a new record.
When Westminster 2 SSE set new all-time records
Date
Kind
Detail
1955-08-13
Record daily precipitation
Record daily precipitation 140.7 mm (5.5 in)
1972-06-22
Record daily precipitation
Record daily precipitation 241.3 mm (9.5 in)
Wettest Day of Each Month
Jun: 241.3 mm (9.5 in)
The wettest day on record for each calendar month at Westminster 2 SSE. The most was 241.3 mm (9.5 in) on 22 June 1972.
Record daily precipitation for each month at Westminster 2 SSE
Month
Record daily precipitation (mm)
Date
Jan
58.9 mm (2.3 in)
1 January 1948
Feb
50.8 mm (2.0 in)
20 February 1924
Mar
69.1 mm (2.7 in)
7 March 1967
Apr
65.0 mm (2.6 in)
26 April 1937
May
66.0 mm (2.6 in)
20 May 1959
Jun
241.3 mm (9.5 in)
22 June 1972
Jul
125.0 mm (4.9 in)
21 July 1956
Aug
140.7 mm (5.5 in)
13 August 1955
Sep
194.6 mm (7.7 in)
26 September 1975
Oct
78.7 mm (3.1 in)
6 October 1932
Nov
99.6 mm (3.9 in)
2 November 1897
Dec
58.2 mm (2.3 in)
2 December 1974
Period of Record Coverage
1893 to 1979
Complete yearUnder 90 percent of days
71 years of record at Westminster 2 SSE, 1893 to 1979. 15 years have data for under 90 percent of days and are left out of rankings: 1893, 1895, 1896, 1897, 1898, 1899, 1901, 1911 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 49 complete years at Westminster 2 SSE, 1900 to 1974. Blue stripes are years cooler than the station's own mean of 11.8 C (53.2 F); red stripes are warmer. The coolest year was 1940, at 10.6 C (51.0 F), and the warmest was 1949, at 13.1 C (55.5 F). The strongest colour marks a difference of 1.3 C (2.3 F).
Annual mean temperature at Westminster 2 SSE as warming stripes, 1900 to 1974
Year
Annual mean temperature
Difference from the station mean
1900
12.1 C
+0.34 C
1921
12.9 C
+1.17 C
1922
12.2 C
+0.41 C
1924
10.9 C
-0.84 C
1925
11.8 C
+0.05 C
1926
11.0 C
-0.73 C
1927
11.9 C
+0.08 C
1928
11.6 C
-0.13 C
1929
12.0 C
+0.22 C
1930
12.6 C
+0.85 C
1933
12.3 C
+0.50 C
1934
11.7 C
-0.09 C
1935
11.4 C
-0.40 C
1936
11.6 C
-0.15 C
1937
11.9 C
+0.08 C
1938
12.4 C
+0.62 C
1939
12.4 C
+0.61 C
1940
10.6 C
-1.19 C
1941
12.2 C
+0.45 C
1942
12.1 C
+0.32 C
1943
12.1 C
+0.37 C
1944
12.2 C
+0.38 C
1945
12.1 C
+0.34 C
1946
12.5 C
+0.75 C
1947
11.9 C
+0.13 C
1949
13.1 C
+1.29 C
1950
11.7 C
-0.07 C
1951
12.0 C
+0.24 C
1952
12.2 C
+0.47 C
1953
12.8 C
+1.06 C
1954
12.1 C
+0.36 C
1955
11.8 C
+0.06 C
1956
11.6 C
-0.20 C
1957
12.0 C
+0.24 C
1958
10.8 C
-1.02 C
1959
12.6 C
+0.78 C
1960
11.2 C
-0.61 C
1961
11.5 C
-0.26 C
1962
10.9 C
-0.87 C
1963
11.0 C
-0.79 C
1964
11.5 C
-0.30 C
1965
11.3 C
-0.48 C
1966
10.9 C
-0.91 C
1967
10.7 C
-1.12 C
1968
11.2 C
-0.54 C
1969
11.0 C
-0.78 C
1970
11.4 C
-0.40 C
1971
11.5 C
-0.23 C
1974
11.7 C
-0.07 C
The annual mean temperature here has fallen by 0.13 C (0.03 to 0.24) per decade over 1900 to 1974. In Fahrenheit: 0.2 F (0.1 to 0.4) per decade. The slope is a straight line fitted to 49 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Westminster 2 SSE
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.13 C (-0.23 to -0.03) per decade
-0.2 F (-0.4 to -0.1) per decade
1900 to 1974
49
Fall
Mean daily maximum
-0.2 C (-0.4 to -0.1) per decade
-0.4 F (-0.6 to -0.2) per decade
1900 to 1974
49
Fall
Mean daily minimum
-0.04 C (-0.13 to 0.05) per decade
-0.1 F (-0.2 to 0.1) per decade
1900 to 1974
49
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
1893 to 1979
Yearly extremes at Westminster 2 SSE: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.0 C (104.0 F)
1930
35.6 C (96.1 F)
71
Coldest night (TNn)
-26.7 C (-16.1 F)
1899
-16.7 C (1.9 F)
71
Wettest day (Rx1day)
241.3 mm (9.5 in)
1972
58.9 mm (2.3 in)
71
Wettest five days (Rx5day)
361.5 mm (14.2 in)
1975
94.5 mm (3.7 in)
70
Longest dry spell (CDD)
31 days
1896
17 days
71
Hottest day (TXx)
The hottest day of the year at Westminster 2 SSE, 1893 to 1979. The record is 40.0 C (104.0 F) in 1930, marked on the chart; the median year is 35.6 C (96.1 F).
Hottest day (TXx) at Westminster 2 SSE by year
Year
Hottest day (TXx)
1893
7.8 C (46.0 F)
1895
38.9 C (102.0 F)
1896
34.4 C (93.9 F)
1897
32.2 C (90.0 F)
1898
39.4 C (102.9 F)
1899
31.7 C (89.1 F)
1900
39.4 C (102.9 F)
1901
35.0 C (95.0 F)
1911
37.8 C (100.0 F)
1912
34.4 C (93.9 F)
1913
35.6 C (96.1 F)
1920
16.7 C (62.1 F)
1921
35.6 C (96.1 F)
1922
34.4 C (93.9 F)
1923
37.2 C (99.0 F)
1924
36.1 C (97.0 F)
1925
38.3 C (100.9 F)
1926
39.4 C (102.9 F)
1927
35.6 C (96.1 F)
1928
35.0 C (95.0 F)
1929
36.7 C (98.1 F)
1930
40.0 C (104.0 F)
1931
37.2 C (99.0 F)
1932
37.8 C (100.0 F)
1933
36.7 C (98.1 F)
1934
38.9 C (102.0 F)
1935
35.6 C (96.1 F)
1936
39.4 C (102.9 F)
1937
35.6 C (96.1 F)
1938
36.7 C (98.1 F)
1939
35.0 C (95.0 F)
1940
36.1 C (97.0 F)
1941
37.2 C (99.0 F)
1942
35.0 C (95.0 F)
1943
37.2 C (99.0 F)
1944
37.8 C (100.0 F)
1945
36.7 C (98.1 F)
1946
35.6 C (96.1 F)
1947
35.0 C (95.0 F)
1948
36.7 C (98.1 F)
1949
37.2 C (99.0 F)
1950
33.9 C (93.0 F)
1951
34.4 C (93.9 F)
1952
36.1 C (97.0 F)
1953
37.8 C (100.0 F)
1954
37.8 C (100.0 F)
1955
37.2 C (99.0 F)
1956
36.1 C (97.0 F)
1957
36.1 C (97.0 F)
1958
32.8 C (91.0 F)
1959
36.1 C (97.0 F)
1960
33.3 C (91.9 F)
1961
34.4 C (93.9 F)
1962
35.6 C (96.1 F)
1963
35.0 C (95.0 F)
1964
36.1 C (97.0 F)
1965
34.4 C (93.9 F)
1966
37.2 C (99.0 F)
1967
33.3 C (91.9 F)
1968
33.9 C (93.0 F)
1969
34.4 C (93.9 F)
1970
33.9 C (93.0 F)
1971
33.3 C (91.9 F)
1972
33.9 C (93.0 F)
1973
34.4 C (93.9 F)
1974
32.2 C (90.0 F)
1975
33.9 C (93.0 F)
1976
32.2 C (90.0 F)
1977
35.0 C (95.0 F)
1978
33.3 C (91.9 F)
1979
15.6 C (60.1 F)
Coldest night (TNn)
The coldest night of the year at Westminster 2 SSE, 1893 to 1979. The record is -26.7 C (-16.1 F) in 1899, marked on the chart; the median year is -16.7 C (1.9 F).
Coldest night (TNn) at Westminster 2 SSE by year
Year
Coldest night (TNn)
1893
-17.8 C (0.0 F)
1895
-20.0 C (-4.0 F)
1896
-17.2 C (1.0 F)
1897
-16.1 C (3.0 F)
1898
-16.1 C (3.0 F)
1899
-26.7 C (-16.1 F)
1900
-16.1 C (3.0 F)
1901
-13.9 C (7.0 F)
1911
-8.3 C (17.1 F)
1912
-25.0 C (-13.0 F)
1913
-11.7 C (10.9 F)
1920
-10.0 C (14.0 F)
1921
-15.6 C (3.9 F)
1922
-17.8 C (0.0 F)
1923
-14.4 C (6.1 F)
1924
-17.2 C (1.0 F)
1925
-20.6 C (-5.1 F)
1926
-16.7 C (1.9 F)
1927
-16.7 C (1.9 F)
1928
-15.0 C (5.0 F)
1929
-16.1 C (3.0 F)
1930
-17.8 C (0.0 F)
1931
-12.8 C (9.0 F)
1932
-13.9 C (7.0 F)
1933
-17.2 C (1.0 F)
1934
-17.8 C (0.0 F)
1935
-25.6 C (-14.1 F)
1936
-21.7 C (-7.1 F)
1937
-12.8 C (9.0 F)
1938
-13.3 C (8.1 F)
1939
-17.2 C (1.0 F)
1940
-17.8 C (0.0 F)
1941
-12.2 C (10.0 F)
1942
-23.3 C (-9.9 F)
1943
-17.8 C (0.0 F)
1944
-16.1 C (3.0 F)
1945
-16.7 C (1.9 F)
1946
-16.7 C (1.9 F)
1947
-17.2 C (1.0 F)
1948
-18.9 C (-2.0 F)
1949
-13.3 C (8.1 F)
1950
-15.0 C (5.0 F)
1951
-17.8 C (0.0 F)
1952
-13.9 C (7.0 F)
1953
-10.0 C (14.0 F)
1954
-16.1 C (3.0 F)
1955
-17.8 C (0.0 F)
1956
-12.8 C (9.0 F)
1957
-21.7 C (-7.1 F)
1958
-17.8 C (0.0 F)
1959
-15.6 C (3.9 F)
1960
-18.3 C (-0.9 F)
1961
-21.1 C (-6.0 F)
1962
-18.3 C (-0.9 F)
1963
-21.7 C (-7.1 F)
1964
-17.2 C (1.0 F)
1965
-18.3 C (-0.9 F)
1966
-17.8 C (0.0 F)
1967
-16.7 C (1.9 F)
1968
-20.6 C (-5.1 F)
1969
-13.9 C (7.0 F)
1970
-18.9 C (-2.0 F)
1971
-16.1 C (3.0 F)
1972
-20.0 C (-4.0 F)
1973
-16.1 C (3.0 F)
1974
-12.8 C (9.0 F)
1975
-13.9 C (7.0 F)
1976
-16.7 C (1.9 F)
1977
-22.2 C (-8.0 F)
1978
-15.0 C (5.0 F)
1979
-16.7 C (1.9 F)
Wettest day (Rx1day)
The wettest day of the year at Westminster 2 SSE, 1893 to 1979. The record is 241.3 mm (9.5 in) in 1972, marked on the chart; the median year is 58.9 mm (2.3 in).
Wettest day (Rx1day) at Westminster 2 SSE by year
Year
Wettest day (Rx1day)
1893
22.9 mm (0.9 in)
1895
113.8 mm (4.5 in)
1896
49.5 mm (1.9 in)
1897
99.6 mm (3.9 in)
1898
41.1 mm (1.6 in)
1899
38.4 mm (1.5 in)
1900
67.8 mm (2.7 in)
1901
44.5 mm (1.8 in)
1911
65.0 mm (2.6 in)
1912
58.4 mm (2.3 in)
1913
49.5 mm (1.9 in)
1920
28.2 mm (1.1 in)
1921
61.0 mm (2.4 in)
1922
36.1 mm (1.4 in)
1923
64.0 mm (2.5 in)
1924
71.6 mm (2.8 in)
1925
50.0 mm (2.0 in)
1926
66.0 mm (2.6 in)
1927
67.6 mm (2.7 in)
1928
57.2 mm (2.3 in)
1929
71.6 mm (2.8 in)
1930
49.5 mm (1.9 in)
1931
65.3 mm (2.6 in)
1932
78.7 mm (3.1 in)
1933
116.8 mm (4.6 in)
1934
41.9 mm (1.6 in)
1935
50.8 mm (2.0 in)
1936
48.0 mm (1.9 in)
1937
88.1 mm (3.5 in)
1938
40.6 mm (1.6 in)
1939
52.1 mm (2.1 in)
1940
66.0 mm (2.6 in)
1941
45.0 mm (1.8 in)
1942
105.4 mm (4.1 in)
1943
72.9 mm (2.9 in)
1944
57.2 mm (2.3 in)
1945
50.3 mm (2.0 in)
1946
87.6 mm (3.4 in)
1947
54.4 mm (2.1 in)
1948
58.9 mm (2.3 in)
1949
101.6 mm (4.0 in)
1950
55.4 mm (2.2 in)
1951
65.0 mm (2.6 in)
1952
67.1 mm (2.6 in)
1953
62.0 mm (2.4 in)
1954
48.3 mm (1.9 in)
1955
140.7 mm (5.5 in)
1956
125.0 mm (4.9 in)
1957
44.7 mm (1.8 in)
1958
51.1 mm (2.0 in)
1959
77.7 mm (3.1 in)
1960
73.7 mm (2.9 in)
1961
36.8 mm (1.4 in)
1962
78.7 mm (3.1 in)
1963
54.9 mm (2.2 in)
1964
39.1 mm (1.5 in)
1965
43.2 mm (1.7 in)
1966
101.1 mm (4.0 in)
1967
69.1 mm (2.7 in)
1968
58.7 mm (2.3 in)
1969
71.4 mm (2.8 in)
1970
107.4 mm (4.2 in)
1971
87.1 mm (3.4 in)
1972
241.3 mm (9.5 in)
1973
59.7 mm (2.4 in)
1974
58.2 mm (2.3 in)
1975
194.6 mm (7.7 in)
1976
49.5 mm (1.9 in)
1977
54.9 mm (2.2 in)
1978
44.2 mm (1.7 in)
1979
50.8 mm (2.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Westminster 2 SSE, 1893 to 1979. The record is 361.5 mm (14.2 in) in 1975, marked on the chart; the median year is 94.5 mm (3.7 in).
Wettest five days (Rx5day) at Westminster 2 SSE by year
Year
Wettest five days (Rx5day)
1893
49.8 mm (2.0 in)
1895
113.8 mm (4.5 in)
1896
68.6 mm (2.7 in)
1897
110.8 mm (4.4 in)
1898
59.7 mm (2.4 in)
1899
50.8 mm (2.0 in)
1900
n/a
1901
48.8 mm (1.9 in)
1911
174.8 mm (6.9 in)
1912
86.6 mm (3.4 in)
1913
58.5 mm (2.3 in)
1920
44.7 mm (1.8 in)
1921
118.7 mm (4.7 in)
1922
63.8 mm (2.5 in)
1923
105.9 mm (4.2 in)
1924
136.6 mm (5.4 in)
1925
53.8 mm (2.1 in)
1926
96.5 mm (3.8 in)
1927
96.1 mm (3.8 in)
1928
103.4 mm (4.1 in)
1929
123.2 mm (4.9 in)
1930
77.3 mm (3.0 in)
1931
65.3 mm (2.6 in)
1932
94.7 mm (3.7 in)
1933
230.1 mm (9.1 in)
1934
96.2 mm (3.8 in)
1935
129.0 mm (5.1 in)
1936
94.2 mm (3.7 in)
1937
142.2 mm (5.6 in)
1938
76.4 mm (3.0 in)
1939
126.2 mm (5.0 in)
1940
112.3 mm (4.4 in)
1941
87.3 mm (3.4 in)
1942
165.9 mm (6.5 in)
1943
110.0 mm (4.3 in)
1944
74.0 mm (2.9 in)
1945
104.3 mm (4.1 in)
1946
122.9 mm (4.8 in)
1947
77.1 mm (3.0 in)
1948
78.7 mm (3.1 in)
1949
148.9 mm (5.9 in)
1950
82.0 mm (3.2 in)
1951
108.6 mm (4.3 in)
1952
154.7 mm (6.1 in)
1953
89.5 mm (3.5 in)
1954
61.2 mm (2.4 in)
1955
198.3 mm (7.8 in)
1956
151.3 mm (6.0 in)
1957
84.1 mm (3.3 in)
1958
81.5 mm (3.2 in)
1959
102.8 mm (4.0 in)
1960
93.2 mm (3.7 in)
1961
73.1 mm (2.9 in)
1962
87.1 mm (3.4 in)
1963
68.6 mm (2.7 in)
1964
57.0 mm (2.2 in)
1965
59.9 mm (2.4 in)
1966
156.4 mm (6.2 in)
1967
88.8 mm (3.5 in)
1968
98.2 mm (3.9 in)
1969
102.4 mm (4.0 in)
1970
107.7 mm (4.2 in)
1971
153.6 mm (6.0 in)
1972
349.8 mm (13.8 in)
1973
64.1 mm (2.5 in)
1974
69.1 mm (2.7 in)
1975
361.5 mm (14.2 in)
1976
71.1 mm (2.8 in)
1977
94.2 mm (3.7 in)
1978
77.7 mm (3.1 in)
1979
109.0 mm (4.3 in)
Longest dry spell (CDD)
The longest dry spell of the year at Westminster 2 SSE, 1893 to 1979. The record is 31 days in 1896, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Westminster 2 SSE by year
Year
Longest dry spell (CDD)
1893
14 days
1895
17 days
1896
31 days
1897
15 days
1898
21 days
1899
17 days
1900
1 day
1901
18 days
1911
11 days
1912
14 days
1913
22 days
1920
7 days
1921
16 days
1922
24 days
1923
21 days
1924
27 days
1925
14 days
1926
15 days
1927
13 days
1928
13 days
1929
17 days
1930
20 days
1931
28 days
1932
17 days
1933
12 days
1934
17 days
1935
13 days
1936
22 days
1937
10 days
1938
13 days
1939
18 days
1940
13 days
1941
28 days
1942
25 days
1943
19 days
1944
18 days
1945
15 days
1946
17 days
1947
20 days
1948
15 days
1949
20 days
1950
15 days
1951
22 days
1952
16 days
1953
18 days
1954
16 days
1955
21 days
1956
15 days
1957
19 days
1958
23 days
1959
25 days
1960
19 days
1961
17 days
1962
20 days
1963
27 days
1964
26 days
1965
14 days
1966
19 days
1967
16 days
1968
25 days
1969
17 days
1970
15 days
1971
15 days
1972
17 days
1973
25 days
1974
18 days
1975
12 days
1976
28 days
1977
30 days
1978
14 days
1979
3 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
49 years with a frost
Across 49 years with a frost, the median last spring frost at Westminster 2 SSE falls on 22 April and the median first autumn frost on 16 October, which leaves a median of 177 days between them.
Fitted over all years, the growing season changes by -1.3 days per decade at this station.
Frost dates and growing season at Westminster 2 SSE
Measure
Median, all years
Earliest period
Recent period (1942 to 1974)
Recent against earliest
Fitted trend
Last spring frost
22 April
n/a
22 April
n/a
+0.4 days per decade
First autumn frost
16 October
n/a
14 October
n/a
-0.8 days per decade
Growing days
177 days
n/a
179 days
n/a
-1.3 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
53 years, 1921 to 1977
A day with at least 61.2 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 234.4 mm (9.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Westminster 2 SSE: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
61.2 mm (2.4 in)
5 years
86.5 mm (3.4 in)
10 years
109.5 mm (4.3 in)
25 years
148.4 mm (5.8 in)
50 years
186.5 mm (7.3 in)
100 years
234.4 mm (9.2 in)
Longer than the 53 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, 53 years of values from 1921 to 1977.
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: 241.3 mm (9.5 in) in 1972; 194.6 mm (7.7 in) in 1975; 140.7 mm (5.5 in) in 1955.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Westminster 2 SSE, at 1966. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1966 ran 0.2 C (0.3 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Westminster 2 SSE, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1966
-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 Westminster 2 SSE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Westminster 2 SSE 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.