Record envelope, standing records and threshold days for Plymouth (USC00276945), New Hampshire, United States, with 57 years of record.
Key Facts for Plymouth
Plymouth (USC00276945) is a weather station in New Hampshire, United States at 43.78 latitude and -71.65 longitude, 201 m (660 ft) above sea level.
The station reports from 1951 to 2007, 57 years of record.
1,464 records set at Plymouth still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Plymouth set a daily record high maximum temperature of 31.7 C (89.1 F) on 26 May 2007.
About the Station
Location: New Hampshire, United States, 43.78 latitude, -71.65 longitude.
Elevation: 201 m (660 ft).
Period of record: 1951 to 2007, 57 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 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
17.8 C (64.0 F)
-37.2 C (-35.0 F)
n/a
n/a
Feb
17.2 C (63.0 F)
-33.3 C (-27.9 F)
n/a
n/a
Mar
26.1 C (79.0 F)
-28.9 C (-20.0 F)
n/a
n/a
Apr
33.3 C (91.9 F)
-16.1 C (3.0 F)
n/a
n/a
May
33.9 C (93.0 F)
-7.8 C (18.0 F)
n/a
n/a
Jun
35.6 C (96.1 F)
-5.6 C (21.9 F)
n/a
n/a
Jul
36.7 C (98.1 F)
0.6 C (33.1 F)
n/a
n/a
Aug
36.7 C (98.1 F)
-1.7 C (28.9 F)
n/a
n/a
Sep
35.0 C (95.0 F)
-5.6 C (21.9 F)
n/a
n/a
Oct
31.1 C (88.0 F)
-9.4 C (15.1 F)
n/a
n/a
Nov
22.8 C (73.0 F)
-20.6 C (-5.1 F)
n/a
n/a
Dec
18.3 C (64.9 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 Plymouth still stand. 1956 holds the most, with 52.
Standing records at Plymouth by the year they were set
Year set
Standing records
1951
25
1952
29
1953
47
1954
27
1955
22
1956
52
1957
31
1958
23
1959
32
1960
14
1961
37
1962
17
1963
30
1964
20
1965
25
1966
24
1967
37
1968
31
1969
22
1970
27
1971
18
1972
22
1973
22
1974
27
1975
19
1976
26
1977
34
1978
26
1979
43
1980
18
1981
28
1982
25
1983
21
1984
29
1985
11
1986
31
1987
35
1988
33
1989
37
1990
22
1991
24
1992
27
1993
24
1994
27
1995
21
1996
18
1997
17
1998
14
1999
17
2000
19
2001
16
2002
39
2003
32
2004
14
2005
23
2006
20
2007
13
All-Time Record Progression
6 new records
6 all-time records were set at Plymouth between 13 July 1987 and 6 February 2001. Each dot is a new record.
When Plymouth set new all-time records
Date
Kind
Detail
1987-07-13
Record high minimum temperature
Record high minimum temperature 20.6 C (69.1 F)
1988-04-29
Record daily precipitation
Record daily precipitation 95.0 mm (3.7 in)
1990-08-08
Record daily precipitation
Record daily precipitation 99.6 mm (3.9 in)
1994-01-21
Record low minimum temperature
Record low minimum temperature -37.2 C (-35.0 F)
1999-09-17
Record daily precipitation
Record daily precipitation 102.1 mm (4.0 in)
2001-02-06
Record daily snowfall
Record daily snowfall 61.0 cm (24.0 in)
Wettest Day of Each Month
Sep: 102.1 mm (4.0 in)
The wettest day on record for each calendar month at Plymouth. The most was 102.1 mm (4.0 in) on 17 September 1999.
Record daily precipitation for each month at Plymouth
Month
Record daily precipitation (mm)
Date
Jan
66.5 mm (2.6 in)
27 January 1986
Feb
58.7 mm (2.3 in)
25 February 1981
Mar
58.9 mm (2.3 in)
14 March 1977
Apr
95.0 mm (3.7 in)
29 April 1988
May
84.1 mm (3.3 in)
14 May 2006
Jun
58.2 mm (2.3 in)
3 June 2001
Jul
86.4 mm (3.4 in)
5 July 1973
Aug
99.6 mm (3.9 in)
8 August 1990
Sep
102.1 mm (4.0 in)
17 September 1999
Oct
95.5 mm (3.8 in)
9 October 2005
Nov
63.5 mm (2.5 in)
8 November 1963
Dec
67.8 mm (2.7 in)
12 December 1952
Period of Record Coverage
1951 to 2007
Complete yearUnder 90 percent of days
57 years of record at Plymouth, 1951 to 2007. 8 years have data for under 90 percent of days and are left out of rankings: 1951, 1953, 1954, 1955, 1964, 1974, 2001, 2007.
Cooler than the station meanWarmer than the station mean
One stripe for each of 46 complete years at Plymouth, 1952 to 2006. Blue stripes are years cooler than the station's own mean of 5.8 C (42.5 F); red stripes are warmer. The coolest year was 1978, at 4.4 C (39.9 F), and the warmest was 1952, at 7.5 C (45.5 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Plymouth as warming stripes, 1952 to 2006
Year
Annual mean temperature
Difference from the station mean
1952
7.5 C
+1.67 C
1954
6.8 C
+1.01 C
1956
5.2 C
-0.62 C
1957
6.0 C
+0.21 C
1958
5.2 C
-0.65 C
1959
6.4 C
+0.59 C
1961
6.1 C
+0.22 C
1962
5.5 C
-0.37 C
1963
5.8 C
-0.08 C
1965
5.5 C
-0.32 C
1966
5.9 C
+0.03 C
1967
5.4 C
-0.41 C
1968
5.5 C
-0.35 C
1969
6.1 C
+0.26 C
1970
5.8 C
-0.06 C
1971
5.6 C
-0.19 C
1972
4.9 C
-0.90 C
1975
6.1 C
+0.24 C
1976
5.1 C
-0.77 C
1978
4.4 C
-1.45 C
1980
5.2 C
-0.66 C
1981
6.5 C
+0.67 C
1982
5.5 C
-0.31 C
1983
7.0 C
+1.20 C
1984
6.3 C
+0.47 C
1985
5.3 C
-0.58 C
1986
5.4 C
-0.41 C
1987
5.6 C
-0.21 C
1988
5.1 C
-0.70 C
1989
4.7 C
-1.18 C
1990
6.4 C
+0.52 C
1991
6.1 C
+0.25 C
1992
4.7 C
-1.14 C
1993
5.1 C
-0.71 C
1994
5.6 C
-0.28 C
1995
6.0 C
+0.16 C
1996
5.9 C
+0.08 C
1997
5.3 C
-0.56 C
1998
7.4 C
+1.59 C
1999
7.2 C
+1.37 C
2000
5.7 C
-0.11 C
2002
6.4 C
+0.55 C
2003
5.6 C
-0.27 C
2004
5.8 C
-0.07 C
2005
6.6 C
+0.75 C
2006
7.4 C
+1.53 C
The fitted trend in annual mean temperature here over 1952 to 2006 is 0.04 C (-0.10 to 0.18) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.2 to 0.3) per decade. The slope is a straight line fitted to 46 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
0.04 C (-0.10 to 0.18) per decade
0.1 F (-0.2 to 0.3) per decade
1952 to 2006
46
Not clearly different from zero
Mean daily maximum
0.1 C (-0.1 to 0.2) per decade
0.1 F (-0.2 to 0.3) per decade
1952 to 2006
46
Not clearly different from zero
Mean daily minimum
0.02 C (-0.15 to 0.20) per decade
0.04 F (-0.28 to 0.36) per decade
1952 to 2006
46
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
1951 to 2007
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)
36.7 C (98.1 F)
1952
33.9 C (93.0 F)
57
Coldest night (TNn)
-37.2 C (-35.0 F)
1994
-27.8 C (-18.0 F)
57
Wettest day (Rx1day)
102.1 mm (4.0 in)
1999
58.7 mm (2.3 in)
57
Wettest five days (Rx5day)
219.0 mm (8.6 in)
1990
87.9 mm (3.5 in)
57
Longest dry spell (CDD)
23 days
1980
15 days
57
Hottest day (TXx)
The hottest day of the year at Plymouth, 1951 to 2007. The record is 36.7 C (98.1 F) in 1952, marked on the chart; the median year is 33.9 C (93.0 F).
Hottest day (TXx) at Plymouth by year
Year
Hottest day (TXx)
1951
32.2 C (90.0 F)
1952
36.7 C (98.1 F)
1953
34.4 C (93.9 F)
1954
33.9 C (93.0 F)
1955
34.4 C (93.9 F)
1956
33.9 C (93.0 F)
1957
32.8 C (91.0 F)
1958
32.8 C (91.0 F)
1959
33.9 C (93.0 F)
1960
34.4 C (93.9 F)
1961
31.7 C (89.1 F)
1962
33.9 C (93.0 F)
1963
34.4 C (93.9 F)
1964
36.7 C (98.1 F)
1965
35.0 C (95.0 F)
1966
35.0 C (95.0 F)
1967
32.2 C (90.0 F)
1968
34.4 C (93.9 F)
1969
33.9 C (93.0 F)
1970
33.3 C (91.9 F)
1971
34.4 C (93.9 F)
1972
32.2 C (90.0 F)
1973
33.9 C (93.0 F)
1974
32.8 C (91.0 F)
1975
36.7 C (98.1 F)
1976
33.3 C (91.9 F)
1977
35.0 C (95.0 F)
1978
33.9 C (93.0 F)
1979
32.8 C (91.0 F)
1980
34.4 C (93.9 F)
1981
33.3 C (91.9 F)
1982
33.3 C (91.9 F)
1983
35.0 C (95.0 F)
1984
32.8 C (91.0 F)
1985
33.3 C (91.9 F)
1986
32.8 C (91.0 F)
1987
36.1 C (97.0 F)
1988
36.1 C (97.0 F)
1989
33.9 C (93.0 F)
1990
32.8 C (91.0 F)
1991
35.6 C (96.1 F)
1992
32.2 C (90.0 F)
1993
33.9 C (93.0 F)
1994
35.0 C (95.0 F)
1995
35.6 C (96.1 F)
1996
31.7 C (89.1 F)
1997
32.2 C (90.0 F)
1998
32.8 C (91.0 F)
1999
33.9 C (93.0 F)
2000
31.1 C (88.0 F)
2001
33.9 C (93.0 F)
2002
36.1 C (97.0 F)
2003
34.4 C (93.9 F)
2004
31.7 C (89.1 F)
2005
33.9 C (93.0 F)
2006
33.3 C (91.9 F)
2007
33.3 C (91.9 F)
Coldest night (TNn)
The coldest night of the year at Plymouth, 1951 to 2007. The record is -37.2 C (-35.0 F) in 1994, marked on the chart; the median year is -27.8 C (-18.0 F).
Coldest night (TNn) at Plymouth by year
Year
Coldest night (TNn)
1951
-30.6 C (-23.1 F)
1952
-25.6 C (-14.1 F)
1953
-20.0 C (-4.0 F)
1954
-25.0 C (-13.0 F)
1955
-25.6 C (-14.1 F)
1956
-28.3 C (-18.9 F)
1957
-36.7 C (-34.1 F)
1958
-31.1 C (-24.0 F)
1959
-27.8 C (-18.0 F)
1960
-26.7 C (-16.1 F)
1961
-31.1 C (-24.0 F)
1962
-28.3 C (-18.9 F)
1963
-28.9 C (-20.0 F)
1964
-26.1 C (-15.0 F)
1965
-27.8 C (-18.0 F)
1966
-26.1 C (-15.0 F)
1967
-26.7 C (-16.1 F)
1968
-27.8 C (-18.0 F)
1969
-25.0 C (-13.0 F)
1970
-26.1 C (-15.0 F)
1971
-31.7 C (-25.1 F)
1972
-28.9 C (-20.0 F)
1973
-26.7 C (-16.1 F)
1974
-28.9 C (-20.0 F)
1975
-27.8 C (-18.0 F)
1976
-30.6 C (-23.1 F)
1977
-27.8 C (-18.0 F)
1978
-27.8 C (-18.0 F)
1979
-28.9 C (-20.0 F)
1980
-30.0 C (-22.0 F)
1981
-28.9 C (-20.0 F)
1982
-27.2 C (-17.0 F)
1983
-23.9 C (-11.0 F)
1984
-30.0 C (-22.0 F)
1985
-27.8 C (-18.0 F)
1986
-26.1 C (-15.0 F)
1987
-30.0 C (-22.0 F)
1988
-31.7 C (-25.1 F)
1989
-30.6 C (-23.1 F)
1990
-23.3 C (-9.9 F)
1991
-28.9 C (-20.0 F)
1992
-26.7 C (-16.1 F)
1993
-33.3 C (-27.9 F)
1994
-37.2 C (-35.0 F)
1995
-27.2 C (-17.0 F)
1996
-28.3 C (-18.9 F)
1997
-29.4 C (-20.9 F)
1998
-24.4 C (-11.9 F)
1999
-25.6 C (-14.1 F)
2000
-28.3 C (-18.9 F)
2001
-23.9 C (-11.0 F)
2002
-23.3 C (-9.9 F)
2003
-27.2 C (-17.0 F)
2004
-27.8 C (-18.0 F)
2005
-27.2 C (-17.0 F)
2006
-20.0 C (-4.0 F)
2007
-26.1 C (-15.0 F)
Wettest day (Rx1day)
The wettest day of the year at Plymouth, 1951 to 2007. The record is 102.1 mm (4.0 in) in 1999, marked on the chart; the median year is 58.7 mm (2.3 in).
Wettest day (Rx1day) at Plymouth by year
Year
Wettest day (Rx1day)
1951
47.2 mm (1.9 in)
1952
67.8 mm (2.7 in)
1953
63.8 mm (2.5 in)
1954
88.9 mm (3.5 in)
1955
52.6 mm (2.1 in)
1956
43.9 mm (1.7 in)
1957
42.7 mm (1.7 in)
1958
52.1 mm (2.1 in)
1959
80.8 mm (3.2 in)
1960
51.6 mm (2.0 in)
1961
35.6 mm (1.4 in)
1962
87.6 mm (3.4 in)
1963
63.5 mm (2.5 in)
1964
61.2 mm (2.4 in)
1965
45.7 mm (1.8 in)
1966
56.6 mm (2.2 in)
1967
31.8 mm (1.3 in)
1968
57.7 mm (2.3 in)
1969
74.9 mm (2.9 in)
1970
47.2 mm (1.9 in)
1971
52.6 mm (2.1 in)
1972
58.2 mm (2.3 in)
1973
86.4 mm (3.4 in)
1974
56.6 mm (2.2 in)
1975
59.2 mm (2.3 in)
1976
68.3 mm (2.7 in)
1977
69.1 mm (2.7 in)
1978
49.8 mm (2.0 in)
1979
43.9 mm (1.7 in)
1980
59.2 mm (2.3 in)
1981
58.7 mm (2.3 in)
1982
39.6 mm (1.6 in)
1983
60.2 mm (2.4 in)
1984
60.5 mm (2.4 in)
1985
50.5 mm (2.0 in)
1986
66.5 mm (2.6 in)
1987
58.9 mm (2.3 in)
1988
95.0 mm (3.7 in)
1989
61.7 mm (2.4 in)
1990
99.6 mm (3.9 in)
1991
60.7 mm (2.4 in)
1992
39.9 mm (1.6 in)
1993
53.3 mm (2.1 in)
1994
35.3 mm (1.4 in)
1995
82.6 mm (3.3 in)
1996
68.6 mm (2.7 in)
1997
66.8 mm (2.6 in)
1998
48.8 mm (1.9 in)
1999
102.1 mm (4.0 in)
2000
48.3 mm (1.9 in)
2001
58.2 mm (2.3 in)
2002
51.6 mm (2.0 in)
2003
70.6 mm (2.8 in)
2004
38.1 mm (1.5 in)
2005
95.5 mm (3.8 in)
2006
84.1 mm (3.3 in)
2007
55.1 mm (2.2 in)
Wettest five days (Rx5day)
The wettest five days of the year at Plymouth, 1951 to 2007. The record is 219.0 mm (8.6 in) in 1990, marked on the chart; the median year is 87.9 mm (3.5 in).
Wettest five days (Rx5day) at Plymouth by year
Year
Wettest five days (Rx5day)
1951
59.7 mm (2.4 in)
1952
139.7 mm (5.5 in)
1953
95.4 mm (3.8 in)
1954
120.6 mm (4.7 in)
1955
106.0 mm (4.2 in)
1956
57.7 mm (2.3 in)
1957
75.4 mm (3.0 in)
1958
63.6 mm (2.5 in)
1959
144.1 mm (5.7 in)
1960
86.3 mm (3.4 in)
1961
57.7 mm (2.3 in)
1962
144.0 mm (5.7 in)
1963
108.8 mm (4.3 in)
1964
62.3 mm (2.5 in)
1965
67.0 mm (2.6 in)
1966
70.1 mm (2.8 in)
1967
57.1 mm (2.2 in)
1968
71.9 mm (2.8 in)
1969
160.5 mm (6.3 in)
1970
61.2 mm (2.4 in)
1971
69.2 mm (2.7 in)
1972
92.9 mm (3.7 in)
1973
147.7 mm (5.8 in)
1974
63.8 mm (2.5 in)
1975
113.8 mm (4.5 in)
1976
80.2 mm (3.2 in)
1977
87.4 mm (3.4 in)
1978
96.7 mm (3.8 in)
1979
96.8 mm (3.8 in)
1980
76.7 mm (3.0 in)
1981
108.7 mm (4.3 in)
1982
72.2 mm (2.8 in)
1983
70.9 mm (2.8 in)
1984
148.1 mm (5.8 in)
1985
57.5 mm (2.3 in)
1986
109.7 mm (4.3 in)
1987
80.8 mm (3.2 in)
1988
105.5 mm (4.2 in)
1989
94.5 mm (3.7 in)
1990
219.0 mm (8.6 in)
1991
87.9 mm (3.5 in)
1992
63.5 mm (2.5 in)
1993
105.5 mm (4.2 in)
1994
55.6 mm (2.2 in)
1995
106.0 mm (4.2 in)
1996
122.3 mm (4.8 in)
1997
81.8 mm (3.2 in)
1998
131.4 mm (5.2 in)
1999
123.4 mm (4.9 in)
2000
62.2 mm (2.4 in)
2001
82.8 mm (3.3 in)
2002
56.1 mm (2.2 in)
2003
98.0 mm (3.9 in)
2004
78.2 mm (3.1 in)
2005
128.7 mm (5.1 in)
2006
144.3 mm (5.7 in)
2007
101.0 mm (4.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Plymouth, 1951 to 2007. The record is 23 days in 1980, marked on the chart; the median year is 15 days.
Longest dry spell (CDD) at Plymouth by year
Year
Longest dry spell (CDD)
1951
13 days
1952
14 days
1953
21 days
1954
17 days
1955
18 days
1956
15 days
1957
16 days
1958
14 days
1959
17 days
1960
15 days
1961
18 days
1962
15 days
1963
15 days
1964
16 days
1965
13 days
1966
14 days
1967
12 days
1968
17 days
1969
15 days
1970
17 days
1971
18 days
1972
16 days
1973
16 days
1974
12 days
1975
15 days
1976
14 days
1977
13 days
1978
21 days
1979
15 days
1980
23 days
1981
14 days
1982
14 days
1983
16 days
1984
15 days
1985
14 days
1986
13 days
1987
19 days
1988
16 days
1989
14 days
1990
13 days
1991
23 days
1992
12 days
1993
14 days
1994
14 days
1995
16 days
1996
11 days
1997
14 days
1998
13 days
1999
13 days
2000
19 days
2001
20 days
2002
12 days
2003
16 days
2004
20 days
2005
15 days
2006
17 days
2007
14 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
46 years with a frost
Across 46 years with a frost, the median last spring frost at Plymouth falls on 28 May and the median first autumn frost on 17 September, which leaves a median of 114 days between them.
Fitted over all years, the growing season changes by +4.5 days per decade at this station.
Frost dates and growing season at Plymouth
Measure
Median, all years
Earliest period
Recent period (1972 to 2006)
Recent against earliest
Fitted trend
Last spring frost
28 May
n/a
24 May
n/a
-2.1 days per decade
First autumn frost
17 September
n/a
21 September
n/a
+2.4 days per decade
Growing days
114 days
n/a
117 days
n/a
+4.5 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
52 years, 1952 to 2006
A day with at least 59.1 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 114.0 mm (4.5 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
59.1 mm (2.3 in)
5 years
75.2 mm (3.0 in)
10 years
85.2 mm (3.4 in)
25 years
97.3 mm (3.8 in)
50 years
105.9 mm (4.2 in)
100 years
114.0 mm (4.5 in)
Longer than the 52 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, 52 years of values from 1952 to 2006.
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: 102.1 mm (4.0 in) in 1999; 99.6 mm (3.9 in) in 1990; 95.5 mm (3.8 in) in 2005.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Plymouth, at 1984 and 1994. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1984 ran 0.4 C (0.6 F) lower than in the years before (possible change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1994 ran 0.2 C (0.4 F) higher 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
1984
-0.4
-0.6
possible
5
1994
+0.2
+0.4
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.