Concord Threshold Days by Year (USC00271682)

18 fixed thresholds counted per year at Concord (USC00271682): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Concord Thresholds

Concord: days with 10 mm (0.39 in) or more of precipitation in 73 years, most in 1872 with 53.
Concord: days with 25 mm (0.98 in) or more of precipitation in 73 years, most in 1878 with 15.
Concord: days with 10 cm (3.9 in) or more of snowfall in 73 years, most in 1879 with 16.
Concord: days with a maximum temperature at or above 30 C (86 F) in 72 years, most in 1870 with 58.
18 fixed thresholds have at least one qualifying day at Concord.

Days at or above 30 C (86 F)

72 years with a qualifying day

Days per year at Concord with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 58 in 1870.

Days at or above 30 C (86 F) per year at Concord
Year	Days	Decade average
1869	18	18
1870	58	28.4
1871	16	28.4
1872	41	28.4
1873	25	28.4
1874	14	28.4
1875	26	28.4
1876	40	28.4
1877	14	28.4
1878	23	28.4
1879	27	28.4
1880	37	14.3
1881	20	14.3
1882	26	14.3
1883	13	14.3
1884	16	14.3
1885	5	14.3
1886	7	14.3
1887	10	14.3
1888	6	14.3
1889	3	14.3
1890	9	19
1891	9	19
1892	17	19
1893	5	19
1894	27	19
1895	26	19
1896	28	19
1897	16	19
1898	24	19
1899	29	19
1900	31	18
1901	26	18
1902	9	18
1903	13	18
1904	11	18
1905	16	18
1906	17	18
1907	13	18
1908	25	18
1909	19	18
1910	19	20.8
1911	28	20.8
1912	22	20.8
1913	24	20.8
1914	22	20.8
1915	11	20.8
1916	18	20.8
1917	17	20.8
1918	27	20.8
1919	20	20.8
1920	17	20
1921	24	20
1922	26	20
1923	19	20
1924	23	20
1925	21	20
1926	12	20
1927	11	20
1928	23	20
1929	24	20
1930	25	25.8
1931	20	25.8
1932	16	25.8
1933	23	25.8
1934	21	25.8
1935	27	25.8
1936	24	25.8
1937	36	25.8
1938	34	25.8
1939	32	25.8
1940	26	26

For each year, a bar from the first to the last day at Concord meeting 30 C (86 F).

First to last qualifying date each year at Concord
Year	First date	Last date
1869	1869-05-12	1869-09-20
1870	1870-04-28	1870-09-15
1871	1871-04-08	1871-09-03
1872	1872-06-12	1872-09-22
1873	1873-05-27	1873-09-28
1874	1874-05-28	1874-09-10
1875	1875-05-23	1875-09-09
1876	1876-05-27	1876-09-01
1877	1877-05-31	1877-09-17
1878	1878-05-03	1878-09-02
1879	1879-05-13	1879-10-16
1880	1880-05-04	1880-09-06
1881	1881-05-10	1881-09-26
1882	1882-06-24	1882-09-19
1883	1883-05-26	1883-08-22
1884	1884-06-06	1884-09-10
1885	1885-04-23	1885-07-17
1886	1886-04-19	1886-08-28
1887	1887-05-10	1887-07-31
1888	1888-04-28	1888-08-05
1889	1889-05-09	1889-05-18
1890	1890-06-24	1890-08-05
1891	1891-05-10	1891-08-11
1892	1892-06-01	1892-08-11
1893	1893-05-23	1893-08-10
1894	1894-06-11	1894-09-09
1895	1895-05-04	1895-09-23
1896	1896-05-09	1896-09-11
1897	1897-06-24	1897-09-10
1898	1898-06-08	1898-09-03
1899	1899-04-30	1899-08-31
1900	1900-05-15	1900-09-06
1901	1901-05-22	1901-09-07
1902	1902-05-23	1902-09-01
1903	1903-05-18	1903-09-15
1904	1904-05-26	1904-09-12
1905	1905-06-16	1905-08-22
1906	1906-05-18	1906-09-21
1907	1907-06-18	1907-08-20
1908	1908-05-26	1908-09-27
1909	1909-06-21	1909-08-25
1910	1910-05-24	1910-08-14
1911	1911-05-11	1911-09-02
1912	1912-05-24	1912-08-25
1913	1913-05-02	1913-09-03
1914	1914-05-26	1914-09-23
1915	1915-06-14	1915-09-17
1916	1916-07-07	1916-09-14
1917	1917-06-20	1917-08-20
1918	1918-05-06	1918-08-25
1919	1919-05-29	1919-09-08
1920	1920-05-28	1920-09-26
1921	1921-05-21	1921-09-03
1922	1922-06-05	1922-10-05
1923	1923-05-26	1923-09-01
1924	1924-06-22	1924-09-01
1925	1925-06-03	1925-09-12
1926	1926-05-03	1926-10-05
1927	1927-04-20	1927-10-01
1928	1928-06-14	1928-10-12
1929	1929-05-28	1929-09-03
1930	1930-05-02	1930-10-13
1931	1931-05-28	1931-09-22
1932	1932-05-16	1932-09-02
1933	1933-05-26	1933-09-27
1934	1934-05-05	1934-08-19
1935	1935-06-15	1935-08-21
1936	1936-05-02	1936-09-08
1937	1937-05-31	1937-09-04
1938	1938-04-20	1938-10-12
1939	1939-05-28	1939-10-10
1940	1940-06-03	1940-08-17

Every Fixed Threshold

Fixed thresholds at Concord
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	72	58	1870	26
35 C (95 F): Days	38	13	1870	1
90 F (32.2 C): Days	71	27	1870	6
100 F (37.8 C): Days	6	4	1911	1
0 C (32 F): Ice days (max	72	85	1904	52
0 C (32 F): Frost days (min	72	184	1873	156
-10 C (14 F): Days with min	72	82	1904	55
-20 C (-4 F): Days with min	71	37	1875	4
-30 C (-22 F): Days with min	11	7	1875	1
20 C (68 F): Tropical nights (min	65	31	1872	7
25 C (77 F): Days with min	2	1	1870	1
10 mm (0.39 in): Days with 10 mm or more rain	73	53	1872	37
25 mm (0.98 in): Days with 25 mm or more rain	73	15	1878	10
50 mm (1.97 in): Days with 50 mm or more rain	48	5	1897	2
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1869	1
10 cm (3.9 in): Days with 10 cm or more snowfall	73	16	1879	3
25 cm (9.8 in): Days with 25 cm or more snowfall	32	3	1869	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1888	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1869.

Download the Data

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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Concord Threshold Days by Year (USC00271682)

Key Facts for Concord Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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