Record envelope, standing records and threshold days for Concord (USC00191622), Massachusetts, United States, with 58 years of record.
Key Facts for Concord
Concord (USC00191622) is a weather station in Massachusetts, United States at 42.45 latitude and -71.37 longitude, 43 m (141 ft) above sea level.
The station reports from 1893 to 1950, 58 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 set a monthly record daily precipitation of 83.3 mm (3.3 in) on 20 August 1950.
About the Station
Location: Massachusetts, United States, 42.45 latitude, -71.37 longitude.
Elevation: 43 m (141 ft).
Period of record: 1893 to 1950, 58 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
18.9 C (66.0 F)
-32.2 C (-26.0 F)
n/a
n/a
Feb
17.8 C (64.0 F)
-32.8 C (-27.0 F)
n/a
n/a
Mar
30.0 C (86.0 F)
-24.4 C (-11.9 F)
n/a
n/a
Apr
33.3 C (91.9 F)
-12.2 C (10.0 F)
n/a
n/a
May
35.6 C (96.1 F)
-6.7 C (19.9 F)
n/a
n/a
Jun
36.7 C (98.1 F)
0.0 C (32.0 F)
n/a
n/a
Jul
39.4 C (102.9 F)
4.4 C (39.9 F)
n/a
n/a
Aug
37.8 C (100.0 F)
1.1 C (34.0 F)
n/a
n/a
Sep
36.1 C (97.0 F)
-5.0 C (23.0 F)
n/a
n/a
Oct
32.2 C (90.0 F)
-8.9 C (16.0 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-20.0 C (-4.0 F)
n/a
n/a
Dec
19.4 C (66.9 F)
-27.2 C (-17.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Concord still stand. 1903 holds the most, with 47.
Standing records at Concord by the year they were set
Year set
Standing records
1893
26
1894
44
1895
40
1896
40
1897
22
1898
34
1901
28
1902
27
1903
47
1904
26
1905
5
1906
36
1907
38
1908
24
1909
30
1910
25
1911
39
1912
32
1913
27
1914
43
1915
24
1916
36
1917
41
1918
36
1919
26
1920
26
1921
26
1922
21
1923
38
1924
19
1925
37
1926
22
1927
29
1928
22
1929
34
1937
29
1938
30
1939
25
1940
29
1941
26
1942
26
1943
30
1944
21
1945
46
1946
36
1947
28
1948
31
1949
37
All-Time Record Progression
1 new records
1 all-time records were set at Concord between 16 February 1943 and 16 February 1943. Each dot is a new record.
When Concord set new all-time records
Date
Kind
Detail
1943-02-16
Record low minimum temperature
Record low minimum temperature -32.8 C (-27.0 F)
Wettest Day of Each Month
Oct: 120.4 mm (4.7 in)
The wettest day on record for each calendar month at Concord. The most was 120.4 mm (4.7 in) on 13 October 1895.
Record daily precipitation for each month at Concord
Month
Record daily precipitation (mm)
Date
Jan
40.1 mm (1.6 in)
30 January 1925
Feb
51.6 mm (2.0 in)
6 February 1896
Mar
43.7 mm (1.7 in)
13 March 1912
Apr
83.1 mm (3.3 in)
28 April 1904
May
69.1 mm (2.7 in)
28 May 1906
Jun
96.3 mm (3.8 in)
19 June 1922
Jul
96.5 mm (3.8 in)
1 July 1915
Aug
83.3 mm (3.3 in)
20 August 1950
Sep
93.0 mm (3.7 in)
19 September 1938
Oct
120.4 mm (4.7 in)
13 October 1895
Nov
90.4 mm (3.6 in)
12 November 1947
Dec
77.7 mm (3.1 in)
2 December 1942
Period of Record Coverage
1893 to 1949
Complete yearUnder 90 percent of days
48 years of record at Concord, 1893 to 1949. 3 years have data for under 90 percent of days and are left out of rankings: 1893, 1896, 1905.
Cooler than the station meanWarmer than the station mean
One stripe for each of 43 complete years at Concord, 1894 to 1948. Blue stripes are years cooler than the station's own mean of 8.4 C (47.1 F); red stripes are warmer. The coolest year was 1904, at 6.5 C (43.6 F), and the warmest was 1921, at 9.4 C (48.9 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at Concord as warming stripes, 1894 to 1948
Year
Annual mean temperature
Difference from the station mean
1894
8.8 C
+0.39 C
1895
8.2 C
-0.15 C
1897
8.4 C
+0.03 C
1898
8.8 C
+0.42 C
1901
8.2 C
-0.21 C
1902
8.2 C
-0.17 C
1903
8.0 C
-0.40 C
1904
6.5 C
-1.93 C
1906
8.3 C
-0.13 C
1907
7.2 C
-1.17 C
1908
8.6 C
+0.20 C
1909
8.2 C
-0.21 C
1910
8.3 C
-0.06 C
1911
8.6 C
+0.17 C
1912
8.0 C
-0.38 C
1914
7.6 C
-0.79 C
1915
8.7 C
+0.35 C
1916
7.8 C
-0.59 C
1917
6.9 C
-1.52 C
1918
7.9 C
-0.50 C
1919
8.7 C
+0.32 C
1920
8.0 C
-0.36 C
1921
9.4 C
+0.99 C
1922
8.8 C
+0.36 C
1923
8.0 C
-0.44 C
1924
7.8 C
-0.56 C
1925
8.7 C
+0.35 C
1926
7.2 C
-1.22 C
1927
8.9 C
+0.53 C
1928
8.7 C
+0.31 C
1929
8.6 C
+0.19 C
1937
9.3 C
+0.95 C
1938
9.1 C
+0.73 C
1939
8.6 C
+0.22 C
1940
7.7 C
-0.67 C
1941
9.2 C
+0.82 C
1942
9.1 C
+0.67 C
1943
8.4 C
+0.04 C
1944
9.0 C
+0.60 C
1945
9.0 C
+0.58 C
1946
9.3 C
+0.93 C
1947
9.2 C
+0.79 C
1948
9.0 C
+0.56 C
The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1894 to 1948. In Fahrenheit: 0.3 F (0.1 to 0.5) per decade. The slope is a straight line fitted to 43 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
0.2 C (0.1 to 0.3) per decade
0.3 F (0.1 to 0.5) per decade
1894 to 1948
43
Rise
Mean daily maximum
0.3 C (0.1 to 0.4) per decade
0.5 F (0.2 to 0.7) per decade
1894 to 1948
43
Rise
Mean daily minimum
0.10 C (-0.02 to 0.23) per decade
0.18 F (-0.04 to 0.41) per decade
1894 to 1948
43
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 1950
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)
39.4 C (102.9 F)
1911
35.0 C (95.0 F)
48
Coldest night (TNn)
-32.8 C (-27.0 F)
1943
-24.4 C (-11.9 F)
48
Wettest day (Rx1day)
120.4 mm (4.7 in)
1895
58.9 mm (2.3 in)
49
Wettest five days (Rx5day)
258.3 mm (10.2 in)
1938
75.1 mm (3.0 in)
49
Longest dry spell (CDD)
36 days
1915
18 days
49
Hottest day (TXx)
The hottest day of the year at Concord, 1893 to 1950. The record is 39.4 C (102.9 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)
1893
33.3 C (91.9 F)
1894
36.7 C (98.1 F)
1895
35.6 C (96.1 F)
1896
35.0 C (95.0 F)
1897
34.4 C (93.9 F)
1898
36.1 C (97.0 F)
1901
36.1 C (97.0 F)
1902
33.3 C (91.9 F)
1903
33.3 C (91.9 F)
1904
32.8 C (91.0 F)
1905
17.2 C (63.0 F)
1906
33.3 C (91.9 F)
1907
34.4 C (93.9 F)
1908
36.1 C (97.0 F)
1909
33.9 C (93.0 F)
1910
34.4 C (93.9 F)
1911
39.4 C (102.9 F)
1912
36.1 C (97.0 F)
1913
35.6 C (96.1 F)
1914
35.0 C (95.0 F)
1915
33.3 C (91.9 F)
1916
33.3 C (91.9 F)
1917
36.7 C (98.1 F)
1918
34.4 C (93.9 F)
1919
36.7 C (98.1 F)
1920
33.3 C (91.9 F)
1921
34.4 C (93.9 F)
1922
33.9 C (93.0 F)
1923
35.0 C (95.0 F)
1924
35.6 C (96.1 F)
1925
36.1 C (97.0 F)
1926
38.3 C (100.9 F)
1927
33.9 C (93.0 F)
1928
33.9 C (93.0 F)
1929
35.0 C (95.0 F)
1937
35.6 C (96.1 F)
1938
32.2 C (90.0 F)
1939
36.1 C (97.0 F)
1940
33.9 C (93.0 F)
1941
36.7 C (98.1 F)
1942
32.8 C (91.0 F)
1943
35.0 C (95.0 F)
1944
37.8 C (100.0 F)
1945
34.4 C (93.9 F)
1946
35.6 C (96.1 F)
1947
35.0 C (95.0 F)
1948
36.7 C (98.1 F)
1949
36.7 C (98.1 F)
1950
n/a
Coldest night (TNn)
The coldest night of the year at Concord, 1893 to 1950. The record is -32.8 C (-27.0 F) in 1943, marked on the chart; the median year is -24.4 C (-11.9 F).
Coldest night (TNn) at Concord by year
Year
Coldest night (TNn)
1893
-26.1 C (-15.0 F)
1894
-28.9 C (-20.0 F)
1895
-22.8 C (-9.0 F)
1896
-25.6 C (-14.1 F)
1897
-22.2 C (-8.0 F)
1898
-28.3 C (-18.9 F)
1901
-22.2 C (-8.0 F)
1902
-24.4 C (-11.9 F)
1903
-24.4 C (-11.9 F)
1904
-32.2 C (-26.0 F)
1905
-16.1 C (3.0 F)
1906
-19.4 C (-2.9 F)
1907
-28.3 C (-18.9 F)
1908
-21.1 C (-6.0 F)
1909
-23.9 C (-11.0 F)
1910
-27.2 C (-17.0 F)
1911
-23.9 C (-11.0 F)
1912
-28.3 C (-18.9 F)
1913
-22.2 C (-8.0 F)
1914
-27.2 C (-17.0 F)
1915
-18.3 C (-0.9 F)
1916
-28.9 C (-20.0 F)
1917
-27.2 C (-17.0 F)
1918
-31.7 C (-25.1 F)
1919
-23.3 C (-9.9 F)
1920
-30.6 C (-23.1 F)
1921
-20.6 C (-5.1 F)
1922
-28.9 C (-20.0 F)
1923
-25.0 C (-13.0 F)
1924
-23.3 C (-9.9 F)
1925
-28.3 C (-18.9 F)
1926
-26.1 C (-15.0 F)
1927
-19.4 C (-2.9 F)
1928
-21.1 C (-6.0 F)
1929
-27.2 C (-17.0 F)
1937
-16.7 C (1.9 F)
1938
-31.1 C (-24.0 F)
1939
-20.0 C (-4.0 F)
1940
-24.4 C (-11.9 F)
1941
-23.3 C (-9.9 F)
1942
-26.7 C (-16.1 F)
1943
-32.8 C (-27.0 F)
1944
-21.1 C (-6.0 F)
1945
-26.1 C (-15.0 F)
1946
-24.4 C (-11.9 F)
1947
-22.8 C (-9.0 F)
1948
-29.4 C (-20.9 F)
1949
-16.7 C (1.9 F)
1950
n/a
Wettest day (Rx1day)
The wettest day of the year at Concord, 1893 to 1950. The record is 120.4 mm (4.7 in) in 1895, marked on the chart; the median year is 58.9 mm (2.3 in).
Wettest day (Rx1day) at Concord by year
Year
Wettest day (Rx1day)
1893
64.5 mm (2.5 in)
1894
37.3 mm (1.5 in)
1895
120.4 mm (4.7 in)
1896
73.9 mm (2.9 in)
1897
54.9 mm (2.2 in)
1898
66.3 mm (2.6 in)
1901
60.5 mm (2.4 in)
1902
45.7 mm (1.8 in)
1903
80.3 mm (3.2 in)
1904
88.4 mm (3.5 in)
1905
32.3 mm (1.3 in)
1906
69.1 mm (2.7 in)
1907
68.8 mm (2.7 in)
1908
37.8 mm (1.5 in)
1909
52.6 mm (2.1 in)
1910
28.4 mm (1.1 in)
1911
60.5 mm (2.4 in)
1912
43.7 mm (1.7 in)
1913
39.1 mm (1.5 in)
1914
39.4 mm (1.6 in)
1915
96.5 mm (3.8 in)
1916
44.5 mm (1.8 in)
1917
40.6 mm (1.6 in)
1918
52.1 mm (2.1 in)
1919
39.4 mm (1.6 in)
1920
61.7 mm (2.4 in)
1921
78.2 mm (3.1 in)
1922
96.3 mm (3.8 in)
1923
76.7 mm (3.0 in)
1924
58.9 mm (2.3 in)
1925
41.4 mm (1.6 in)
1926
42.7 mm (1.7 in)
1927
72.1 mm (2.8 in)
1928
50.3 mm (2.0 in)
1929
43.4 mm (1.7 in)
1937
45.7 mm (1.8 in)
1938
93.0 mm (3.7 in)
1939
82.0 mm (3.2 in)
1940
35.8 mm (1.4 in)
1941
40.1 mm (1.6 in)
1942
77.7 mm (3.1 in)
1943
65.0 mm (2.6 in)
1944
66.5 mm (2.6 in)
1945
38.4 mm (1.5 in)
1946
61.5 mm (2.4 in)
1947
90.4 mm (3.6 in)
1948
43.9 mm (1.7 in)
1949
56.1 mm (2.2 in)
1950
83.3 mm (3.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Concord, 1893 to 1950. The record is 258.3 mm (10.2 in) in 1938, marked on the chart; the median year is 75.1 mm (3.0 in).
Wettest five days (Rx5day) at Concord by year
Year
Wettest five days (Rx5day)
1893
41.7 mm (1.6 in)
1894
52.1 mm (2.1 in)
1895
162.9 mm (6.4 in)
1896
97.8 mm (3.9 in)
1897
75.1 mm (3.0 in)
1898
81.9 mm (3.2 in)
1901
89.6 mm (3.5 in)
1902
55.1 mm (2.2 in)
1903
101.4 mm (4.0 in)
1904
136.7 mm (5.4 in)
1905
56.2 mm (2.2 in)
1906
103.2 mm (4.1 in)
1907
78.8 mm (3.1 in)
1908
68.9 mm (2.7 in)
1909
68.3 mm (2.7 in)
1910
51.3 mm (2.0 in)
1911
77.8 mm (3.1 in)
1912
73.6 mm (2.9 in)
1913
68.4 mm (2.7 in)
1914
57.4 mm (2.3 in)
1915
161.3 mm (6.4 in)
1916
63.3 mm (2.5 in)
1917
59.4 mm (2.3 in)
1918
77.0 mm (3.0 in)
1919
72.6 mm (2.9 in)
1920
75.1 mm (3.0 in)
1921
132.7 mm (5.2 in)
1922
167.9 mm (6.6 in)
1923
102.3 mm (4.0 in)
1924
71.6 mm (2.8 in)
1925
88.4 mm (3.5 in)
1926
50.9 mm (2.0 in)
1927
87.3 mm (3.4 in)
1928
61.2 mm (2.4 in)
1929
64.5 mm (2.5 in)
1937
65.8 mm (2.6 in)
1938
258.3 mm (10.2 in)
1939
91.5 mm (3.6 in)
1940
87.1 mm (3.4 in)
1941
44.7 mm (1.8 in)
1942
85.1 mm (3.4 in)
1943
75.9 mm (3.0 in)
1944
98.0 mm (3.9 in)
1945
61.0 mm (2.4 in)
1946
63.9 mm (2.5 in)
1947
99.0 mm (3.9 in)
1948
67.5 mm (2.7 in)
1949
60.7 mm (2.4 in)
1950
101.3 mm (4.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Concord, 1893 to 1950. The record is 36 days in 1915, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at Concord by year
Year
Longest dry spell (CDD)
1893
6 days
1894
12 days
1895
21 days
1896
16 days
1897
19 days
1898
10 days
1901
18 days
1902
15 days
1903
16 days
1904
17 days
1905
12 days
1906
17 days
1907
12 days
1908
22 days
1909
12 days
1910
25 days
1911
34 days
1912
33 days
1913
17 days
1914
30 days
1915
36 days
1916
19 days
1917
22 days
1918
19 days
1919
19 days
1920
26 days
1921
19 days
1922
20 days
1923
15 days
1924
34 days
1925
20 days
1926
15 days
1927
15 days
1928
17 days
1929
14 days
1937
13 days
1938
20 days
1939
25 days
1940
17 days
1941
19 days
1942
12 days
1943
22 days
1944
18 days
1945
16 days
1946
19 days
1947
28 days
1948
18 days
1949
17 days
1950
13 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
43 years with a frost
Across 43 years with a frost, the median last spring frost at Concord falls on 6 May and the median first autumn frost on 30 September, which leaves a median of 147 days between them.
Fitted over all years, the growing season changes by +0.7 days per decade at this station.
Frost dates and growing season at Concord
Measure
Median, all years
Earliest period
Recent period (1911 to 1948)
Recent against earliest
Fitted trend
Last spring frost
6 May
n/a
5 May
n/a
-0.8 days per decade
First autumn frost
30 September
n/a
29 September
n/a
-0.2 days per decade
Growing days
147 days
n/a
149 days
n/a
+0.7 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
45 years, 1895 to 1949
A day with at least 56.9 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 127.8 mm (5.0 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
56.9 mm (2.2 in)
5 years
75.8 mm (3.0 in)
10 years
88.3 mm (3.5 in)
25 years
104.2 mm (4.1 in)
50 years
116.0 mm (4.6 in)
Longer than the 45 years of record
100 years
127.8 mm (5.0 in)
Longer than the 45 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, 45 years of values from 1895 to 1949.
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: 120.4 mm (4.7 in) in 1895; 96.5 mm (3.8 in) in 1915; 96.3 mm (3.8 in) in 1922.
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.