Grand Forks Rayfield Threshold Days by Year (CA001133275)

16 fixed thresholds counted per year at Grand Forks Rayfield (CA001133275): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Grand Forks Rayfield Thresholds

Grand Forks Rayfield: days with 10 mm (0.39 in) or more of precipitation in 29 years, most in 1927 with 15.
Grand Forks Rayfield: days with a maximum temperature at or above 30 C (86 F) in 27 years, most in 1922 with 79.
Grand Forks Rayfield: days with a maximum temperature at or above 35 C (95 F) in 27 years, most in 1922 with 26.
Grand Forks Rayfield: days with a maximum temperature at or above 90 F (32.2 C) in 27 years, most in 1922 with 52.
16 fixed thresholds have at least one qualifying day at Grand Forks Rayfield.

Days at or above 30 C (86 F)

27 years with a qualifying day

Days per year at Grand Forks Rayfield with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 79 in 1922.

Days at or above 30 C (86 F) per year at Grand Forks Rayfield
Year	Days	Decade average
1912	22	36.1
1913	32	36.1
1914	48	36.1
1915	40	36.1
1916	29	36.1
1917	46	36.1
1918	34	36.1
1919	38	36.1
1920	47	52
1921	33	52
1922	79	52
1923	51	52
1924	60	52
1925	57	52
1926	51	52
1927	38	52
1928	46	52
1929	58	52
1930	44	51.6
1931	46	51.6
1932	44	51.6
1933	43	51.6
1934	64	51.6
1935	41	51.6
1936	61	51.6
1937	49	51.6
1938	72	51.6

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

First to last qualifying date each year at Grand Forks Rayfield
Year	First date	Last date
1912	1912-05-13	1912-08-24
1913	1913-06-01	1913-08-30
1914	1914-05-31	1914-09-03
1915	1915-06-23	1915-09-04
1916	1916-06-13	1916-09-01
1917	1917-06-14	1917-09-20
1918	1918-06-09	1918-09-19
1919	1919-05-21	1919-09-03
1920	1920-06-21	1920-09-04
1921	1921-06-21	1921-08-30
1922	1922-05-15	1922-09-25
1923	1923-05-08	1923-09-14
1924	1924-05-09	1924-09-16
1925	1925-06-19	1925-09-14
1926	1926-04-15	1926-08-25
1927	1927-06-06	1927-08-23
1928	1928-05-20	1928-09-23
1929	1929-05-19	1929-09-16
1930	1930-06-15	1930-09-08
1931	1931-05-12	1931-09-03
1932	1932-06-11	1932-09-10
1933	1933-06-03	1933-09-04
1934	1934-04-20	1934-09-06
1935	1935-05-30	1935-09-09
1936	1936-04-17	1936-08-30
1937	1937-05-31	1937-09-19
1938	1938-05-21	1938-09-23

Every Fixed Threshold

Fixed thresholds at Grand Forks Rayfield
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	27	79	1922	72
35 C (95 F): Days	27	26	1922	22
40 C (104 F): Days	7	2	1922	2
90 F (32.2 C): Days	27	52	1922	47
100 F (37.8 C): Days	19	11	1938	11
0 C (32 F): Ice days (max	27	83	1916	46
0 C (32 F): Frost days (min	27	188	1929	165
-10 C (14 F): Days with min	27	68	1916	32
-20 C (-4 F): Days with min	26	23	1930	1
-30 C (-22 F): Days with min	10	11	1930	4
20 C (68 F): Tropical nights (min	3	1	1923	1
10 mm (0.39 in): Days with 10 mm or more rain	29	15	1927	9
25 mm (0.98 in): Days with 25 mm or more rain	9	2	1927	2
50 mm (1.97 in): Days with 50 mm or more rain	1	1	1929	1
10 cm (3.9 in): Days with 10 cm or more snowfall	24	7	1927	2
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1937	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1912.

Download the Data

Data for Grand Forks Rayfield 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Grand Forks Rayfield Threshold Days by Year (CA001133275)

Key Facts for Grand Forks Rayfield Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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