Record envelope, standing records and threshold days for Concord (USC00271682), New Hampshire, United States, with 74 years of record.
Key Facts for Concord
Concord (USC00271682) is a weather station in New Hampshire, United States at 43.20 latitude and -71.53 longitude, 82 m (270 ft) above sea level.
The station reports from 1868 to 1941, 74 years of record.
1,464 records set at Concord still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Concord tied a monthly record high maximum temperature of 33.3 C (91.9 F) on 20 April 1941.
About the Station
Location: New Hampshire, United States, 43.20 latitude, -71.53 longitude.
Elevation: 82 m (270 ft).
Period of record: 1868 to 1941, 74 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 Concord. 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 Concord, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
22.2 C (72.0 F)
-37.2 C (-35.0 F)
n/a
n/a
Feb
20.0 C (68.0 F)
-36.7 C (-34.1 F)
n/a
n/a
Mar
27.8 C (82.0 F)
-28.9 C (-20.0 F)
n/a
n/a
Apr
33.3 C (91.9 F)
-13.9 C (7.0 F)
n/a
n/a
May
36.7 C (98.1 F)
-5.6 C (21.9 F)
n/a
n/a
Jun
38.3 C (100.9 F)
0.0 C (32.0 F)
n/a
n/a
Jul
38.9 C (102.0 F)
3.3 C (37.9 F)
n/a
n/a
Aug
37.2 C (99.0 F)
1.7 C (35.1 F)
n/a
n/a
Sep
35.6 C (96.1 F)
-3.9 C (25.0 F)
n/a
n/a
Oct
33.3 C (91.9 F)
-10.6 C (12.9 F)
n/a
n/a
Nov
26.7 C (80.1 F)
-27.2 C (-17.0 F)
n/a
n/a
Dec
18.3 C (64.9 F)
-31.1 C (-24.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Concord still stand. 1875 holds the most, with 49.
Standing records at Concord by the year they were set
Year set
Standing records
1868
14
1869
24
1870
33
1871
36
1872
38
1873
31
1874
30
1875
49
1876
44
1877
27
1878
19
1879
36
1880
40
1881
27
1882
15
1883
19
1884
19
1885
23
1886
21
1887
15
1888
24
1889
15
1890
17
1891
16
1892
15
1893
19
1894
18
1895
23
1896
23
1897
18
1898
15
1899
25
1900
26
1901
18
1902
31
1903
24
1904
22
1905
11
1906
18
1907
20
1908
11
1909
12
1910
14
1911
20
1912
11
1913
22
1914
27
1915
12
1916
16
1917
23
1918
23
1919
16
1920
11
1921
22
1922
15
1923
23
1924
11
1925
16
1926
9
1927
12
1928
16
1929
12
1930
18
1931
21
1932
11
1933
17
1934
18
1935
7
1936
16
1937
8
1938
17
1939
7
1940
5
1941
7
All-Time Record Progression
6 new records
6 all-time records were set at Concord between 4 January 1904 and 29 December 1933. Each dot is a new record.
When Concord set new all-time records
Date
Kind
Detail
1904-01-04
Record low maximum temperature
Record low maximum temperature -19.4 C (-2.9 F)
1911-07-03
Record high maximum temperature
Record high maximum temperature 38.3 C (100.9 F)
1911-07-04
Record high maximum temperature
Record high maximum temperature 38.9 C (102.0 F)
1914-01-13
Record low maximum temperature
Record low maximum temperature -20.0 C (-4.0 F)
1917-12-29
Record low maximum temperature
Record low maximum temperature -20.6 C (-5.1 F)
1933-12-29
Record low maximum temperature
Record low maximum temperature -23.9 C (-11.0 F)
Wettest Day of Each Month
Oct: 151.9 mm (6.0 in)
The wettest day on record for each calendar month at Concord. The most was 151.9 mm (6.0 in) on 4 October 1869.
Record daily precipitation for each month at Concord
Month
Record daily precipitation (mm)
Date
Jan
48.3 mm (1.9 in)
2 January 1870
Feb
53.3 mm (2.1 in)
6 February 1896
Mar
58.4 mm (2.3 in)
12 March 1888
Apr
76.5 mm (3.0 in)
7 April 1901
May
62.7 mm (2.5 in)
5 May 1922
Jun
76.2 mm (3.0 in)
4 June 1876
Jul
122.4 mm (4.8 in)
13 July 1897
Aug
84.3 mm (3.3 in)
7 August 1901
Sep
151.1 mm (5.9 in)
16 September 1932
Oct
151.9 mm (6.0 in)
4 October 1869
Nov
83.1 mm (3.3 in)
13 November 1937
Dec
71.1 mm (2.8 in)
10 December 1878
Period of Record Coverage
1868 to 1941
Complete yearUnder 90 percent of days
74 years of record at Concord, 1868 to 1941. 2 years have data for under 90 percent of days and are left out of rankings: 1868, 1941.
Cooler than the station meanWarmer than the station mean
One stripe for each of 72 complete years at Concord, 1869 to 1940. Blue stripes are years cooler than the station's own mean of 7.7 C (45.9 F); red stripes are warmer. The coolest year was 1893, at 5.5 C (41.8 F), and the warmest was 1878, at 9.5 C (49.2 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at Concord as warming stripes, 1869 to 1940
Year
Annual mean temperature
Difference from the station mean
1869
7.9 C
+0.18 C
1870
9.2 C
+1.47 C
1871
7.4 C
-0.31 C
1872
8.4 C
+0.65 C
1873
6.9 C
-0.82 C
1874
7.8 C
+0.10 C
1875
6.5 C
-1.25 C
1876
8.5 C
+0.76 C
1877
9.5 C
+1.75 C
1878
9.5 C
+1.80 C
1879
8.3 C
+0.51 C
1880
9.3 C
+1.60 C
1881
9.0 C
+1.30 C
1882
8.3 C
+0.57 C
1883
7.4 C
-0.39 C
1884
8.0 C
+0.22 C
1885
7.0 C
-0.74 C
1886
7.9 C
+0.18 C
1887
7.7 C
-0.01 C
1888
6.9 C
-0.83 C
1889
8.7 C
+0.98 C
1890
7.4 C
-0.37 C
1891
8.3 C
+0.56 C
1892
7.5 C
-0.27 C
1893
5.5 C
-2.27 C
1894
7.6 C
-0.11 C
1895
7.6 C
-0.10 C
1896
7.5 C
-0.27 C
1897
7.6 C
-0.17 C
1898
8.0 C
+0.25 C
1899
7.2 C
-0.51 C
1900
7.6 C
-0.14 C
1901
7.3 C
-0.49 C
1902
7.3 C
-0.41 C
1903
7.4 C
-0.35 C
1904
5.9 C
-1.87 C
1905
7.0 C
-0.77 C
1906
7.7 C
-0.08 C
1907
6.6 C
-1.19 C
1908
8.0 C
+0.22 C
1909
7.6 C
-0.13 C
1910
7.8 C
+0.08 C
1911
7.8 C
+0.10 C
1912
7.4 C
-0.38 C
1913
8.6 C
+0.90 C
1914
6.7 C
-1.07 C
1915
8.3 C
+0.55 C
1916
7.3 C
-0.46 C
1917
6.2 C
-1.54 C
1918
7.2 C
-0.56 C
1919
8.0 C
+0.30 C
1920
7.7 C
-0.05 C
1921
8.7 C
+0.96 C
1922
7.9 C
+0.14 C
1923
7.3 C
-0.42 C
1924
7.2 C
-0.59 C
1925
7.6 C
-0.10 C
1926
6.5 C
-1.22 C
1927
7.9 C
+0.18 C
1928
7.7 C
-0.02 C
1929
7.6 C
-0.14 C
1930
8.3 C
+0.53 C
1931
8.9 C
+1.17 C
1932
8.3 C
+0.55 C
1933
8.0 C
+0.24 C
1934
7.5 C
-0.25 C
1935
7.6 C
-0.19 C
1936
7.9 C
+0.16 C
1937
8.6 C
+0.82 C
1938
9.0 C
+1.22 C
1939
7.9 C
+0.18 C
1940
7.4 C
-0.35 C
The fitted trend in annual mean temperature here over 1869 to 1940 is -0.04 C (-0.12 to 0.06) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.2 to 0.1) per decade. The slope is a straight line fitted to 72 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Concord
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.04 C (-0.12 to 0.06) per decade
-0.1 F (-0.2 to 0.1) per decade
1869 to 1940
72
Not clearly different from zero
Mean daily maximum
-0.09 C (-0.20 to 0.01) per decade
-0.17 F (-0.36 to 0.02) per decade
1869 to 1940
72
Not clearly different from zero
Mean daily minimum
0.02 C (-0.07 to 0.11) per decade
0.04 F (-0.12 to 0.20) per decade
1869 to 1940
72
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
1868 to 1941
Yearly extremes at Concord: 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)
1911
35.0 C (95.0 F)
74
Coldest night (TNn)
-37.2 C (-35.0 F)
1878
-26.7 C (-16.1 F)
74
Wettest day (Rx1day)
151.9 mm (6.0 in)
1869
56.7 mm (2.2 in)
74
Wettest five days (Rx5day)
188.0 mm (7.4 in)
1869
81.4 mm (3.2 in)
74
Longest dry spell (CDD)
45 days
1924
19 days
74
Hottest day (TXx)
The hottest day of the year at Concord, 1868 to 1941. The record is 38.9 C (102.0 F) in 1911, marked on the chart; the median year is 35.0 C (95.0 F).
Hottest day (TXx) at Concord by year
Year
Hottest day (TXx)
1868
27.2 C (81.0 F)
1869
33.9 C (93.0 F)
1870
37.8 C (100.0 F)
1871
35.0 C (95.0 F)
1872
36.7 C (98.1 F)
1873
33.9 C (93.0 F)
1874
33.9 C (93.0 F)
1875
32.2 C (90.0 F)
1876
36.1 C (97.0 F)
1877
32.2 C (90.0 F)
1878
37.8 C (100.0 F)
1879
34.4 C (93.9 F)
1880
36.1 C (97.0 F)
1881
35.6 C (96.1 F)
1882
36.7 C (98.1 F)
1883
33.9 C (93.0 F)
1884
32.8 C (91.0 F)
1885
32.8 C (91.0 F)
1886
33.3 C (91.9 F)
1887
33.9 C (93.0 F)
1888
34.4 C (93.9 F)
1889
33.3 C (91.9 F)
1890
32.8 C (91.0 F)
1891
35.6 C (96.1 F)
1892
33.9 C (93.0 F)
1893
32.2 C (90.0 F)
1894
35.6 C (96.1 F)
1895
35.0 C (95.0 F)
1896
34.4 C (93.9 F)
1897
36.7 C (98.1 F)
1898
35.6 C (96.1 F)
1899
36.1 C (97.0 F)
1900
35.6 C (96.1 F)
1901
37.8 C (100.0 F)
1902
31.7 C (89.1 F)
1903
35.0 C (95.0 F)
1904
33.9 C (93.0 F)
1905
34.4 C (93.9 F)
1906
33.9 C (93.0 F)
1907
34.4 C (93.9 F)
1908
35.0 C (95.0 F)
1909
34.4 C (93.9 F)
1910
35.6 C (96.1 F)
1911
38.9 C (102.0 F)
1912
36.1 C (97.0 F)
1913
37.2 C (99.0 F)
1914
33.9 C (93.0 F)
1915
33.3 C (91.9 F)
1916
34.4 C (93.9 F)
1917
37.2 C (99.0 F)
1918
35.0 C (95.0 F)
1919
38.3 C (100.9 F)
1920
33.3 C (91.9 F)
1921
35.0 C (95.0 F)
1922
34.4 C (93.9 F)
1923
35.0 C (95.0 F)
1924
35.0 C (95.0 F)
1925
35.6 C (96.1 F)
1926
37.8 C (100.0 F)
1927
34.4 C (93.9 F)
1928
34.4 C (93.9 F)
1929
35.0 C (95.0 F)
1930
33.9 C (93.0 F)
1931
35.0 C (95.0 F)
1932
33.3 C (91.9 F)
1933
36.7 C (98.1 F)
1934
35.0 C (95.0 F)
1935
33.9 C (93.0 F)
1936
34.4 C (93.9 F)
1937
35.0 C (95.0 F)
1938
35.0 C (95.0 F)
1939
35.0 C (95.0 F)
1940
35.6 C (96.1 F)
1941
33.3 C (91.9 F)
Coldest night (TNn)
The coldest night of the year at Concord, 1868 to 1941. The record is -37.2 C (-35.0 F) in 1878, marked on the chart; the median year is -26.7 C (-16.1 F).
Coldest night (TNn) at Concord by year
Year
Coldest night (TNn)
1868
-23.3 C (-9.9 F)
1869
-28.9 C (-20.0 F)
1870
-20.6 C (-5.1 F)
1871
-26.7 C (-16.1 F)
1872
-28.9 C (-20.0 F)
1873
-32.2 C (-26.0 F)
1874
-33.3 C (-27.9 F)
1875
-36.7 C (-34.1 F)
1876
-28.9 C (-20.0 F)
1877
-33.9 C (-29.0 F)
1878
-37.2 C (-35.0 F)
1879
-23.3 C (-9.9 F)
1880
-23.3 C (-9.9 F)
1881
-28.3 C (-18.9 F)
1882
-30.0 C (-22.0 F)
1883
-26.7 C (-16.1 F)
1884
-27.2 C (-17.0 F)
1885
-27.2 C (-17.0 F)
1886
-28.9 C (-20.0 F)
1887
-28.3 C (-18.9 F)
1888
-26.7 C (-16.1 F)
1889
-25.6 C (-14.1 F)
1890
-23.9 C (-11.0 F)
1891
-22.8 C (-9.0 F)
1892
-22.2 C (-8.0 F)
1893
-26.1 C (-15.0 F)
1894
-28.3 C (-18.9 F)
1895
-26.1 C (-15.0 F)
1896
-29.4 C (-20.9 F)
1897
-23.9 C (-11.0 F)
1898
-35.6 C (-32.1 F)
1899
-27.8 C (-18.0 F)
1900
-26.7 C (-16.1 F)
1901
-30.6 C (-23.1 F)
1902
-24.4 C (-11.9 F)
1903
-27.8 C (-18.0 F)
1904
-30.6 C (-23.1 F)
1905
-26.1 C (-15.0 F)
1906
-23.9 C (-11.0 F)
1907
-24.4 C (-11.9 F)
1908
-23.9 C (-11.0 F)
1909
-25.6 C (-14.1 F)
1910
-25.6 C (-14.1 F)
1911
-22.8 C (-9.0 F)
1912
-28.9 C (-20.0 F)
1913
-21.7 C (-7.1 F)
1914
-28.9 C (-20.0 F)
1915
-25.0 C (-13.0 F)
1916
-26.1 C (-15.0 F)
1917
-27.2 C (-17.0 F)
1918
-26.7 C (-16.1 F)
1919
-23.3 C (-9.9 F)
1920
-30.6 C (-23.1 F)
1921
-22.2 C (-8.0 F)
1922
-30.6 C (-23.1 F)
1923
-25.6 C (-14.1 F)
1924
-27.8 C (-18.0 F)
1925
-29.4 C (-20.9 F)
1926
-22.2 C (-8.0 F)
1927
-24.4 C (-11.9 F)
1928
-22.8 C (-9.0 F)
1929
-26.7 C (-16.1 F)
1930
-23.3 C (-9.9 F)
1931
-26.7 C (-16.1 F)
1932
-23.3 C (-9.9 F)
1933
-29.4 C (-20.9 F)
1934
-28.9 C (-20.0 F)
1935
-28.3 C (-18.9 F)
1936
-26.7 C (-16.1 F)
1937
-17.8 C (0.0 F)
1938
-27.8 C (-18.0 F)
1939
-23.3 C (-9.9 F)
1940
-23.9 C (-11.0 F)
1941
-18.3 C (-0.9 F)
Wettest day (Rx1day)
The wettest day of the year at Concord, 1868 to 1941. The record is 151.9 mm (6.0 in) in 1869, marked on the chart; the median year is 56.7 mm (2.2 in).
Wettest day (Rx1day) at Concord by year
Year
Wettest day (Rx1day)
1868
92.7 mm (3.6 in)
1869
151.9 mm (6.0 in)
1870
48.3 mm (1.9 in)
1871
44.5 mm (1.8 in)
1872
55.1 mm (2.2 in)
1873
35.6 mm (1.4 in)
1874
50.8 mm (2.0 in)
1875
45.7 mm (1.8 in)
1876
76.2 mm (3.0 in)
1877
87.6 mm (3.4 in)
1878
71.1 mm (2.8 in)
1879
45.0 mm (1.8 in)
1880
41.4 mm (1.6 in)
1881
41.4 mm (1.6 in)
1882
80.0 mm (3.1 in)
1883
38.1 mm (1.5 in)
1884
40.6 mm (1.6 in)
1885
69.9 mm (2.8 in)
1886
37.6 mm (1.5 in)
1887
80.0 mm (3.1 in)
1888
59.7 mm (2.4 in)
1889
51.6 mm (2.0 in)
1890
61.5 mm (2.4 in)
1891
35.6 mm (1.4 in)
1892
78.7 mm (3.1 in)
1893
41.9 mm (1.6 in)
1894
32.3 mm (1.3 in)
1895
64.8 mm (2.6 in)
1896
55.6 mm (2.2 in)
1897
122.4 mm (4.8 in)
1898
74.9 mm (2.9 in)
1899
46.2 mm (1.8 in)
1900
49.3 mm (1.9 in)
1901
84.3 mm (3.3 in)
1902
61.2 mm (2.4 in)
1903
51.1 mm (2.0 in)
1904
70.1 mm (2.8 in)
1905
57.7 mm (2.3 in)
1906
62.0 mm (2.4 in)
1907
83.1 mm (3.3 in)
1908
84.3 mm (3.3 in)
1909
34.0 mm (1.3 in)
1910
28.7 mm (1.1 in)
1911
50.5 mm (2.0 in)
1912
31.2 mm (1.2 in)
1913
54.9 mm (2.2 in)
1914
56.9 mm (2.2 in)
1915
77.5 mm (3.1 in)
1916
60.7 mm (2.4 in)
1917
46.7 mm (1.8 in)
1918
66.5 mm (2.6 in)
1919
59.9 mm (2.4 in)
1920
94.5 mm (3.7 in)
1921
62.0 mm (2.4 in)
1922
62.7 mm (2.5 in)
1923
82.6 mm (3.3 in)
1924
36.3 mm (1.4 in)
1925
36.3 mm (1.4 in)
1926
56.4 mm (2.2 in)
1927
69.3 mm (2.7 in)
1928
61.5 mm (2.4 in)
1929
33.3 mm (1.3 in)
1930
48.8 mm (1.9 in)
1931
43.2 mm (1.7 in)
1932
151.1 mm (5.9 in)
1933
50.8 mm (2.0 in)
1934
53.1 mm (2.1 in)
1935
51.3 mm (2.0 in)
1936
56.9 mm (2.2 in)
1937
83.1 mm (3.3 in)
1938
70.9 mm (2.8 in)
1939
42.9 mm (1.7 in)
1940
62.5 mm (2.5 in)
1941
36.1 mm (1.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Concord, 1868 to 1941. The record is 188.0 mm (7.4 in) in 1869, marked on the chart; the median year is 81.4 mm (3.2 in).
Wettest five days (Rx5day) at Concord by year
Year
Wettest five days (Rx5day)
1868
110.5 mm (4.4 in)
1869
188.0 mm (7.4 in)
1870
96.6 mm (3.8 in)
1871
82.5 mm (3.2 in)
1872
72.9 mm (2.9 in)
1873
81.4 mm (3.2 in)
1874
77.7 mm (3.1 in)
1875
93.9 mm (3.7 in)
1876
94.0 mm (3.7 in)
1877
87.6 mm (3.4 in)
1878
96.1 mm (3.8 in)
1879
112.3 mm (4.4 in)
1880
66.8 mm (2.6 in)
1881
89.7 mm (3.5 in)
1882
104.7 mm (4.1 in)
1883
95.8 mm (3.8 in)
1884
52.9 mm (2.1 in)
1885
78.6 mm (3.1 in)
1886
71.1 mm (2.8 in)
1887
138.2 mm (5.4 in)
1888
136.2 mm (5.4 in)
1889
72.5 mm (2.9 in)
1890
98.3 mm (3.9 in)
1891
51.3 mm (2.0 in)
1892
106.7 mm (4.2 in)
1893
81.0 mm (3.2 in)
1894
62.3 mm (2.5 in)
1895
81.3 mm (3.2 in)
1896
85.3 mm (3.4 in)
1897
149.9 mm (5.9 in)
1898
111.0 mm (4.4 in)
1899
51.8 mm (2.0 in)
1900
62.2 mm (2.4 in)
1901
126.0 mm (5.0 in)
1902
79.5 mm (3.1 in)
1903
102.6 mm (4.0 in)
1904
81.0 mm (3.2 in)
1905
81.5 mm (3.2 in)
1906
103.7 mm (4.1 in)
1907
94.5 mm (3.7 in)
1908
93.7 mm (3.7 in)
1909
65.1 mm (2.6 in)
1910
48.2 mm (1.9 in)
1911
75.1 mm (3.0 in)
1912
68.9 mm (2.7 in)
1913
68.1 mm (2.7 in)
1914
60.2 mm (2.4 in)
1915
106.4 mm (4.2 in)
1916
81.0 mm (3.2 in)
1917
69.6 mm (2.7 in)
1918
73.8 mm (2.9 in)
1919
63.7 mm (2.5 in)
1920
114.3 mm (4.5 in)
1921
92.7 mm (3.6 in)
1922
94.6 mm (3.7 in)
1923
109.7 mm (4.3 in)
1924
59.6 mm (2.3 in)
1925
60.0 mm (2.4 in)
1926
63.3 mm (2.5 in)
1927
104.9 mm (4.1 in)
1928
80.0 mm (3.1 in)
1929
56.9 mm (2.2 in)
1930
56.2 mm (2.2 in)
1931
81.7 mm (3.2 in)
1932
151.6 mm (6.0 in)
1933
68.3 mm (2.7 in)
1934
58.3 mm (2.3 in)
1935
73.4 mm (2.9 in)
1936
109.9 mm (4.3 in)
1937
105.2 mm (4.1 in)
1938
185.4 mm (7.3 in)
1939
64.3 mm (2.5 in)
1940
70.9 mm (2.8 in)
1941
38.4 mm (1.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Concord, 1868 to 1941. The record is 45 days in 1924, marked on the chart; the median year is 19 days.
Longest dry spell (CDD) at Concord by year
Year
Longest dry spell (CDD)
1868
16 days
1869
18 days
1870
20 days
1871
21 days
1872
22 days
1873
19 days
1874
29 days
1875
18 days
1876
19 days
1877
22 days
1878
15 days
1879
23 days
1880
17 days
1881
13 days
1882
18 days
1883
13 days
1884
19 days
1885
13 days
1886
16 days
1887
19 days
1888
9 days
1889
29 days
1890
17 days
1891
14 days
1892
28 days
1893
14 days
1894
21 days
1895
21 days
1896
14 days
1897
19 days
1898
14 days
1899
17 days
1900
19 days
1901
26 days
1902
13 days
1903
17 days
1904
20 days
1905
22 days
1906
16 days
1907
14 days
1908
33 days
1909
14 days
1910
16 days
1911
24 days
1912
28 days
1913
20 days
1914
31 days
1915
36 days
1916
13 days
1917
22 days
1918
25 days
1919
19 days
1920
24 days
1921
16 days
1922
16 days
1923
19 days
1924
45 days
1925
15 days
1926
17 days
1927
16 days
1928
18 days
1929
14 days
1930
17 days
1931
16 days
1932
23 days
1933
13 days
1934
16 days
1935
20 days
1936
15 days
1937
13 days
1938
22 days
1939
25 days
1940
21 days
1941
22 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
72 years with a frost
Across 72 years with a frost, the median last spring frost at Concord falls on 6 May and the median first autumn frost on 2 October, which leaves a median of 148 days between them.
In 1911 to 1940 the median growing season was 148 days. That is 1 day fewer than in 1869 to 1898.
Fitted over all years, the growing season changes by +0.1 days per decade at this station.
Frost dates and growing season at Concord
Measure
Median, all years
Earliest period (1869 to 1898)
Recent period (1911 to 1940)
Recent against earliest
Fitted trend
Last spring frost
6 May
6 May
6 May
no change
0.0 days per decade
First autumn frost
2 October
3 October
2 October
1 day earlier
+0.1 days per decade
Growing days
148 days
149 days
148 days
1 day fewer
+0.1 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
73 years, 1868 to 1940
A day with at least 55.9 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 141.9 mm (5.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Concord: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
55.9 mm (2.2 in)
5 years
75.7 mm (3.0 in)
10 years
90.0 mm (3.5 in)
25 years
109.6 mm (4.3 in)
50 years
125.3 mm (4.9 in)
100 years
141.9 mm (5.6 in)
Longer than the 73 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, 73 years of values from 1868 to 1940.
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: 151.9 mm (6.0 in) in 1869; 151.1 mm (5.9 in) in 1932; 122.4 mm (4.8 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 Concord standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Concord 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.