Record envelope, standing records and threshold days for Plymouth (USC00276944), New Hampshire, United States, with 65 years of record.
Key Facts for Plymouth
Plymouth (USC00276944) is a weather station in New Hampshire, United States at 43.75 latitude and -71.68 longitude, 153 m (502 ft) above sea level.
The station reports from 1887 to 1951, 65 years of record.
1,464 records set at Plymouth still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Plymouth set a daily record precipitation of 36.8 mm (1.4 in) on 31 March 1951.
About the Station
Location: New Hampshire, United States, 43.75 latitude, -71.68 longitude.
Elevation: 153 m (502 ft).
Period of record: 1887 to 1951, 65 years.
Eligible elements: tmax, tmin, prcp, snow.
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 Plymouth. 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 Plymouth, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
18.3 C (64.9 F)
-34.4 C (-29.9 F)
n/a
n/a
Feb
15.6 C (60.1 F)
-38.9 C (-38.0 F)
n/a
n/a
Mar
27.2 C (81.0 F)
-31.7 C (-25.1 F)
n/a
n/a
Apr
32.8 C (91.0 F)
-16.7 C (1.9 F)
n/a
n/a
May
35.6 C (96.1 F)
-6.7 C (19.9 F)
n/a
n/a
Jun
37.8 C (100.0 F)
-1.7 C (28.9 F)
n/a
n/a
Jul
38.9 C (102.0 F)
1.7 C (35.1 F)
n/a
n/a
Aug
35.6 C (96.1 F)
-1.7 C (28.9 F)
n/a
n/a
Sep
33.9 C (93.0 F)
-7.8 C (18.0 F)
n/a
n/a
Oct
30.0 C (86.0 F)
-12.8 C (9.0 F)
n/a
n/a
Nov
27.8 C (82.0 F)
-25.0 C (-13.0 F)
n/a
n/a
Dec
16.1 C (61.0 F)
-33.9 C (-29.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Plymouth still stand. 1895 holds the most, with 41.
Standing records at Plymouth by the year they were set
Year set
Standing records
1887
4
1888
38
1890
27
1891
35
1893
25
1894
34
1895
41
1896
32
1897
31
1898
22
1899
40
1900
33
1901
30
1902
17
1903
32
1904
22
1905
13
1906
15
1907
17
1908
27
1909
20
1910
18
1911
28
1912
29
1913
25
1914
29
1915
17
1916
28
1917
22
1918
29
1919
17
1920
12
1921
25
1922
9
1923
30
1924
20
1925
31
1926
19
1927
14
1928
21
1929
26
1930
23
1931
15
1932
17
1933
30
1934
25
1935
10
1936
31
1937
11
1938
21
1939
31
1940
24
1941
15
1942
28
1943
17
1944
17
1945
27
1946
23
1947
25
1948
19
1949
22
1950
22
1951
7
All-Time Record Progression
2 new records
2 all-time records were set at Plymouth between 8 July 1921 and 4 November 1927. Each dot is a new record.
When Plymouth set new all-time records
Date
Kind
Detail
1921-07-08
Record high minimum temperature
Record high minimum temperature 23.3 C (73.9 F)
1927-11-04
Record daily precipitation
Record daily precipitation 131.8 mm (5.2 in)
Wettest Day of Each Month
Nov: 131.8 mm (5.2 in)
The wettest day on record for each calendar month at Plymouth. The most was 131.8 mm (5.2 in) on 4 November 1927.
Record daily precipitation for each month at Plymouth
Month
Record daily precipitation (mm)
Date
Jan
49.8 mm (2.0 in)
25 January 1938
Feb
68.6 mm (2.7 in)
13 February 1900
Mar
87.9 mm (3.5 in)
12 March 1936
Apr
71.6 mm (2.8 in)
14 April 1895
May
60.2 mm (2.4 in)
17 May 1916
Jun
58.2 mm (2.3 in)
4 June 1922
Jul
70.9 mm (2.8 in)
22 July 1931
Aug
77.7 mm (3.1 in)
24 August 1933
Sep
113.0 mm (4.4 in)
21 September 1938
Oct
59.9 mm (2.4 in)
30 October 1917
Nov
131.8 mm (5.2 in)
4 November 1927
Dec
82.6 mm (3.3 in)
7 December 1945
Period of Record Coverage
1887 to 1951
Complete yearUnder 90 percent of days
63 years of record at Plymouth, 1887 to 1951. 3 years have data for under 90 percent of days and are left out of rankings: 1887, 1948, 1951.
Cooler than the station meanWarmer than the station mean
One stripe for each of 55 complete years at Plymouth, 1888 to 1947. Blue stripes are years cooler than the station's own mean of 6.2 C (43.1 F); red stripes are warmer. The coolest year was 1926, at 4.6 C (40.4 F), and the warmest was 1921, at 7.3 C (45.1 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Plymouth as warming stripes, 1888 to 1947
Year
Annual mean temperature
Difference from the station mean
1888
4.9 C
-1.27 C
1890
5.6 C
-0.59 C
1891
6.8 C
+0.60 C
1893
4.7 C
-1.45 C
1894
5.7 C
-0.49 C
1895
5.9 C
-0.33 C
1896
5.8 C
-0.42 C
1897
6.4 C
+0.24 C
1898
7.1 C
+0.91 C
1899
6.2 C
+0.01 C
1900
6.5 C
+0.28 C
1901
6.5 C
+0.27 C
1902
6.8 C
+0.60 C
1903
6.6 C
+0.42 C
1904
5.4 C
-0.83 C
1905
6.0 C
-0.16 C
1906
7.0 C
+0.79 C
1907
6.0 C
-0.21 C
1908
6.8 C
+0.57 C
1909
6.4 C
+0.21 C
1910
6.6 C
+0.45 C
1911
6.3 C
+0.16 C
1912
5.8 C
-0.36 C
1913
7.3 C
+1.12 C
1914
5.6 C
-0.59 C
1916
6.2 C
-0.03 C
1917
4.9 C
-1.27 C
1918
6.1 C
-0.13 C
1919
6.7 C
+0.54 C
1920
6.2 C
+0.02 C
1921
7.3 C
+1.12 C
1923
5.7 C
-0.49 C
1924
5.3 C
-0.92 C
1925
5.9 C
-0.24 C
1926
4.6 C
-1.54 C
1927
6.4 C
+0.17 C
1928
6.1 C
-0.08 C
1929
6.1 C
-0.13 C
1930
6.7 C
+0.49 C
1931
7.2 C
+1.06 C
1932
6.3 C
+0.13 C
1933
5.8 C
-0.34 C
1935
5.3 C
-0.90 C
1936
5.6 C
-0.61 C
1937
6.4 C
+0.26 C
1938
6.5 C
+0.29 C
1939
5.5 C
-0.64 C
1940
5.4 C
-0.82 C
1941
6.5 C
+0.28 C
1942
7.2 C
+1.06 C
1943
6.2 C
+0.05 C
1944
6.8 C
+0.58 C
1945
7.0 C
+0.83 C
1946
7.0 C
+0.79 C
1947
6.8 C
+0.64 C
The fitted trend in annual mean temperature here over 1888 to 1947 is 0.07 C (-0.04 to 0.17) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.1 to 0.3) per decade. The slope is a straight line fitted to 55 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Plymouth
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.07 C (-0.04 to 0.17) per decade
0.1 F (-0.1 to 0.3) per decade
1888 to 1947
55
Not clearly different from zero
Mean daily maximum
0.1 C (-0.1 to 0.2) per decade
0.1 F (-0.1 to 0.3) per decade
1888 to 1947
55
Not clearly different from zero
Mean daily minimum
0.08 C (-0.04 to 0.20) per decade
0.1 F (-0.1 to 0.4) per decade
1888 to 1947
55
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
1887 to 1951
Yearly extremes at Plymouth: 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)
1897
35.0 C (95.0 F)
63
Coldest night (TNn)
-38.9 C (-38.0 F)
1898
-28.9 C (-20.0 F)
63
Wettest day (Rx1day)
131.8 mm (5.2 in)
1927
54.5 mm (2.1 in)
64
Wettest five days (Rx5day)
190.0 mm (7.5 in)
1938
79.8 mm (3.1 in)
64
Longest dry spell (CDD)
43 days
1924
17 days
64
Hottest day (TXx)
The hottest day of the year at Plymouth, 1887 to 1951. The record is 38.9 C (102.0 F) in 1897, marked on the chart; the median year is 35.0 C (95.0 F).
Hottest day (TXx) at Plymouth by year
Year
Hottest day (TXx)
1887
21.7 C (71.1 F)
1888
36.1 C (97.0 F)
1889
n/a
1890
35.6 C (96.1 F)
1891
35.6 C (96.1 F)
1893
35.6 C (96.1 F)
1894
36.7 C (98.1 F)
1895
36.1 C (97.0 F)
1896
35.0 C (95.0 F)
1897
38.9 C (102.0 F)
1898
36.7 C (98.1 F)
1899
35.6 C (96.1 F)
1900
36.1 C (97.0 F)
1901
37.8 C (100.0 F)
1902
33.3 C (91.9 F)
1903
35.6 C (96.1 F)
1904
36.1 C (97.0 F)
1905
35.0 C (95.0 F)
1906
35.6 C (96.1 F)
1907
36.1 C (97.0 F)
1908
35.0 C (95.0 F)
1909
33.3 C (91.9 F)
1910
33.9 C (93.0 F)
1911
38.3 C (100.9 F)
1912
35.6 C (96.1 F)
1913
35.6 C (96.1 F)
1914
33.3 C (91.9 F)
1915
31.1 C (88.0 F)
1916
34.4 C (93.9 F)
1917
33.3 C (91.9 F)
1918
33.3 C (91.9 F)
1919
37.8 C (100.0 F)
1920
32.8 C (91.0 F)
1921
33.9 C (93.0 F)
1922
32.8 C (91.0 F)
1923
33.3 C (91.9 F)
1924
31.7 C (89.1 F)
1925
32.8 C (91.0 F)
1926
32.2 C (90.0 F)
1927
30.0 C (86.0 F)
1928
32.2 C (90.0 F)
1929
33.3 C (91.9 F)
1930
35.0 C (95.0 F)
1931
35.0 C (95.0 F)
1932
32.2 C (90.0 F)
1933
36.1 C (97.0 F)
1934
35.0 C (95.0 F)
1935
35.0 C (95.0 F)
1936
35.6 C (96.1 F)
1937
35.0 C (95.0 F)
1938
34.4 C (93.9 F)
1939
35.0 C (95.0 F)
1940
35.0 C (95.0 F)
1941
35.6 C (96.1 F)
1942
34.4 C (93.9 F)
1943
34.4 C (93.9 F)
1944
35.6 C (96.1 F)
1945
32.8 C (91.0 F)
1946
34.4 C (93.9 F)
1947
35.0 C (95.0 F)
1948
35.0 C (95.0 F)
1949
35.0 C (95.0 F)
1950
34.4 C (93.9 F)
1951
16.1 C (61.0 F)
Coldest night (TNn)
The coldest night of the year at Plymouth, 1887 to 1951. The record is -38.9 C (-38.0 F) in 1898, marked on the chart; the median year is -28.9 C (-20.0 F).
Coldest night (TNn) at Plymouth by year
Year
Coldest night (TNn)
1887
-21.7 C (-7.1 F)
1888
-28.9 C (-20.0 F)
1889
n/a
1890
-27.2 C (-17.0 F)
1891
-25.0 C (-13.0 F)
1893
-30.0 C (-22.0 F)
1894
-31.1 C (-24.0 F)
1895
-28.9 C (-20.0 F)
1896
-30.6 C (-23.1 F)
1897
-28.9 C (-20.0 F)
1898
-38.9 C (-38.0 F)
1899
-25.6 C (-14.1 F)
1900
-29.4 C (-20.9 F)
1901
-27.8 C (-18.0 F)
1902
-25.6 C (-14.1 F)
1903
-32.8 C (-27.0 F)
1904
-32.8 C (-27.0 F)
1905
-28.9 C (-20.0 F)
1906
-27.2 C (-17.0 F)
1907
-27.8 C (-18.0 F)
1908
-26.7 C (-16.1 F)
1909
-30.0 C (-22.0 F)
1910
-29.4 C (-20.9 F)
1911
-27.8 C (-18.0 F)
1912
-32.2 C (-26.0 F)
1913
-25.6 C (-14.1 F)
1914
-32.2 C (-26.0 F)
1915
-25.6 C (-14.1 F)
1916
-27.2 C (-17.0 F)
1917
-28.9 C (-20.0 F)
1918
-34.4 C (-29.9 F)
1919
-26.1 C (-15.0 F)
1920
-32.2 C (-26.0 F)
1921
-24.4 C (-11.9 F)
1922
-29.4 C (-20.9 F)
1923
-28.9 C (-20.0 F)
1924
-31.1 C (-24.0 F)
1925
-32.2 C (-26.0 F)
1926
-26.1 C (-15.0 F)
1927
-28.9 C (-20.0 F)
1928
-27.2 C (-17.0 F)
1929
-31.7 C (-25.1 F)
1930
-27.2 C (-17.0 F)
1931
-26.7 C (-16.1 F)
1932
-23.9 C (-11.0 F)
1933
-33.9 C (-29.0 F)
1934
-34.4 C (-29.9 F)
1935
-30.0 C (-22.0 F)
1936
-32.8 C (-27.0 F)
1937
-22.8 C (-9.0 F)
1938
-31.1 C (-24.0 F)
1939
-27.2 C (-17.0 F)
1940
-27.8 C (-18.0 F)
1941
-26.1 C (-15.0 F)
1942
-31.7 C (-25.1 F)
1943
-33.9 C (-29.0 F)
1944
-30.6 C (-23.1 F)
1945
-28.3 C (-18.9 F)
1946
-28.9 C (-20.0 F)
1947
-25.0 C (-13.0 F)
1948
-33.3 C (-27.9 F)
1949
-25.0 C (-13.0 F)
1950
-28.3 C (-18.9 F)
1951
-29.4 C (-20.9 F)
Wettest day (Rx1day)
The wettest day of the year at Plymouth, 1887 to 1951. The record is 131.8 mm (5.2 in) in 1927, marked on the chart; the median year is 54.5 mm (2.1 in).
Wettest day (Rx1day) at Plymouth by year
Year
Wettest day (Rx1day)
1887
41.4 mm (1.6 in)
1888
46.7 mm (1.8 in)
1889
53.1 mm (2.1 in)
1890
48.3 mm (1.9 in)
1891
55.9 mm (2.2 in)
1893
45.7 mm (1.8 in)
1894
67.6 mm (2.7 in)
1895
71.6 mm (2.8 in)
1896
71.4 mm (2.8 in)
1897
53.6 mm (2.1 in)
1898
50.8 mm (2.0 in)
1899
41.4 mm (1.6 in)
1900
68.6 mm (2.7 in)
1901
58.9 mm (2.3 in)
1902
43.4 mm (1.7 in)
1903
67.6 mm (2.7 in)
1904
73.4 mm (2.9 in)
1905
106.4 mm (4.2 in)
1906
43.7 mm (1.7 in)
1907
52.1 mm (2.1 in)
1908
61.7 mm (2.4 in)
1909
46.5 mm (1.8 in)
1910
59.7 mm (2.4 in)
1911
44.2 mm (1.7 in)
1912
55.6 mm (2.2 in)
1913
56.6 mm (2.2 in)
1914
43.7 mm (1.7 in)
1915
60.5 mm (2.4 in)
1916
69.1 mm (2.7 in)
1917
59.9 mm (2.4 in)
1918
47.0 mm (1.9 in)
1919
58.7 mm (2.3 in)
1920
65.5 mm (2.6 in)
1921
41.1 mm (1.6 in)
1922
58.2 mm (2.3 in)
1923
53.3 mm (2.1 in)
1924
54.9 mm (2.2 in)
1925
50.8 mm (2.0 in)
1926
42.2 mm (1.7 in)
1927
131.8 mm (5.2 in)
1928
31.8 mm (1.3 in)
1929
45.7 mm (1.8 in)
1930
43.7 mm (1.7 in)
1931
70.9 mm (2.8 in)
1932
50.8 mm (2.0 in)
1933
77.7 mm (3.1 in)
1934
76.2 mm (3.0 in)
1935
43.9 mm (1.7 in)
1936
87.9 mm (3.5 in)
1937
51.6 mm (2.0 in)
1938
113.0 mm (4.4 in)
1939
41.9 mm (1.6 in)
1940
46.2 mm (1.8 in)
1941
50.3 mm (2.0 in)
1942
43.9 mm (1.7 in)
1943
54.1 mm (2.1 in)
1944
47.2 mm (1.9 in)
1945
82.6 mm (3.3 in)
1946
64.3 mm (2.5 in)
1947
61.0 mm (2.4 in)
1948
55.9 mm (2.2 in)
1949
62.5 mm (2.5 in)
1950
70.1 mm (2.8 in)
1951
36.8 mm (1.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Plymouth, 1887 to 1951. The record is 190.0 mm (7.5 in) in 1938, marked on the chart; the median year is 79.8 mm (3.1 in).
Wettest five days (Rx5day) at Plymouth by year
Year
Wettest five days (Rx5day)
1887
56.1 mm (2.2 in)
1888
80.3 mm (3.2 in)
1889
69.3 mm (2.7 in)
1890
74.0 mm (2.9 in)
1891
60.2 mm (2.4 in)
1893
69.9 mm (2.8 in)
1894
74.7 mm (2.9 in)
1895
118.8 mm (4.7 in)
1896
118.3 mm (4.7 in)
1897
113.0 mm (4.4 in)
1898
75.0 mm (3.0 in)
1899
47.4 mm (1.9 in)
1900
88.4 mm (3.5 in)
1901
83.6 mm (3.3 in)
1902
64.8 mm (2.6 in)
1903
90.9 mm (3.6 in)
1904
84.9 mm (3.3 in)
1905
141.4 mm (5.6 in)
1906
90.2 mm (3.6 in)
1907
83.9 mm (3.3 in)
1908
99.1 mm (3.9 in)
1909
63.0 mm (2.5 in)
1910
66.0 mm (2.6 in)
1911
56.2 mm (2.2 in)
1912
77.8 mm (3.1 in)
1913
72.0 mm (2.8 in)
1914
66.3 mm (2.6 in)
1915
103.4 mm (4.1 in)
1916
93.2 mm (3.7 in)
1917
83.0 mm (3.3 in)
1918
70.4 mm (2.8 in)
1919
77.2 mm (3.0 in)
1920
93.2 mm (3.7 in)
1921
52.9 mm (2.1 in)
1922
95.7 mm (3.8 in)
1923
101.4 mm (4.0 in)
1924
65.8 mm (2.6 in)
1925
84.6 mm (3.3 in)
1926
59.0 mm (2.3 in)
1927
157.7 mm (6.2 in)
1928
63.9 mm (2.5 in)
1929
65.7 mm (2.6 in)
1930
67.1 mm (2.6 in)
1931
104.7 mm (4.1 in)
1932
85.3 mm (3.4 in)
1933
79.5 mm (3.1 in)
1934
80.0 mm (3.1 in)
1935
71.8 mm (2.8 in)
1936
136.6 mm (5.4 in)
1937
88.6 mm (3.5 in)
1938
190.0 mm (7.5 in)
1939
70.8 mm (2.8 in)
1940
65.8 mm (2.6 in)
1941
72.6 mm (2.9 in)
1942
78.2 mm (3.1 in)
1943
85.6 mm (3.4 in)
1944
98.2 mm (3.9 in)
1945
92.7 mm (3.6 in)
1946
82.2 mm (3.2 in)
1947
97.9 mm (3.9 in)
1948
65.3 mm (2.6 in)
1949
73.2 mm (2.9 in)
1950
81.6 mm (3.2 in)
1951
54.1 mm (2.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Plymouth, 1887 to 1951. The record is 43 days in 1924, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Plymouth by year
Year
Longest dry spell (CDD)
1887
13 days
1888
10 days
1889
22 days
1890
12 days
1891
17 days
1893
19 days
1894
20 days
1895
20 days
1896
19 days
1897
12 days
1898
18 days
1899
18 days
1900
25 days
1901
26 days
1902
13 days
1903
31 days
1904
18 days
1905
13 days
1906
14 days
1907
13 days
1908
25 days
1909
14 days
1910
18 days
1911
19 days
1912
20 days
1913
15 days
1914
23 days
1915
19 days
1916
13 days
1917
19 days
1918
25 days
1919
20 days
1920
13 days
1921
10 days
1922
13 days
1923
19 days
1924
43 days
1925
17 days
1926
15 days
1927
21 days
1928
17 days
1929
12 days
1930
17 days
1931
14 days
1932
14 days
1933
15 days
1934
16 days
1935
17 days
1936
16 days
1937
12 days
1938
23 days
1939
26 days
1940
16 days
1941
27 days
1942
15 days
1943
15 days
1944
24 days
1945
16 days
1946
15 days
1947
28 days
1948
16 days
1949
20 days
1950
16 days
1951
9 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
55 years with a frost
Across 55 years with a frost, the median last spring frost at Plymouth falls on 24 May and the median first autumn frost on 20 September, which leaves a median of 120 days between them.
Fitted over all years, the growing season changes by -2.7 days per decade at this station.
Frost dates and growing season at Plymouth
Measure
Median, all years
Earliest period
Recent period (1916 to 1947)
Recent against earliest
Fitted trend
Last spring frost
24 May
n/a
26 May
n/a
+0.9 days per decade
First autumn frost
20 September
n/a
19 September
n/a
-1.8 days per decade
Growing days
120 days
n/a
116 days
n/a
-2.7 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
54 years, 1888 to 1950
A day with at least 55.4 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 128.7 mm (5.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Plymouth: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
55.4 mm (2.2 in)
5 years
70.4 mm (2.8 in)
10 years
81.9 mm (3.2 in)
25 years
98.7 mm (3.9 in)
50 years
112.9 mm (4.4 in)
100 years
128.7 mm (5.1 in)
Longer than the 54 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, 54 years of values from 1888 to 1950.
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: 131.8 mm (5.2 in) in 1927; 113.0 mm (4.4 in) in 1938; 106.4 mm (4.2 in) in 1905.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Plymouth, at 1921. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1921 ran 0.4 C (0.8 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Plymouth, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1921
-0.4
-0.8
likely
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 Plymouth standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Plymouth 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.