Nelson Threshold Days by Year (USC00255840)

21 fixed thresholds counted per year at Nelson (USC00255840): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Nelson Thresholds

Nelson: days with 10 mm (0.39 in) or more of precipitation in 95 years, most in 1993 with 44.
Nelson: days with 25 mm (0.98 in) or more of precipitation in 94 years, most in 1944 with 12.
Nelson: days with 10 cm (3.9 in) or more of snowfall in 62 years, most in 1944 with 6.
Nelson: days with 50 mm (1.97 in) or more of precipitation in 59 years, most in 1949 with 4.
21 fixed thresholds have at least one qualifying day at Nelson.

Days at or above 30 C (86 F)

35 years with a qualifying day

Days per year at Nelson with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 117 in 1956.

Days at or above 30 C (86 F) per year at Nelson
Year	Days	Decade average
1912	67	71
1913	93	71
1914	94	71
1915	19	71
1916	79	71
1917	74	71
1935	67	91.6
1936	104	91.6
1937	95	91.6
1938	88	91.6
1939	104	91.6
1940	84	77
1941	78	77
1942	77	77
1943	89	77
1944	71	77
1945	62	77
1946	77	77
1947	90	77
1948	81	77
1949	61	77
1950	48	78.4
1951	46	78.4
1952	87	78.4
1953	110	78.4
1954	96	78.4
1955	91	78.4
1956	117	78.4
1957	60	78.4
1958	54	78.4
1959	75	78.4
1960	58	56
1961	52	56
1962	35	56
1963	79	56

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

First to last qualifying date each year at Nelson
Year	First date	Last date
1912	1912-04-05	1912-10-04
1913	1913-05-27	1913-10-13
1914	1914-04-20	1914-09-27
1915	1915-04-28	1915-08-16
1916	1916-04-11	1916-10-07
1917	1917-03-30	1917-09-14
1935	1935-03-15	1935-09-24
1936	1936-05-04	1936-09-22
1937	1937-04-22	1937-10-28
1938	1938-06-05	1938-10-16
1939	1939-04-22	1939-10-06
1940	1940-04-01	1940-10-20
1941	1941-05-14	1941-09-20
1942	1942-04-04	1942-10-02
1943	1943-03-29	1943-10-19
1944	1944-05-12	1944-09-17
1945	1945-05-25	1945-11-05
1946	1946-03-31	1946-09-26
1947	1947-05-03	1947-10-21
1948	1948-04-18	1948-10-15
1949	1949-04-25	1949-10-07
1950	1950-04-22	1950-09-30
1951	1951-04-28	1951-10-03
1952	1952-05-04	1952-09-30
1953	1953-04-21	1953-10-10
1954	1954-04-06	1954-10-09
1955	1955-04-19	1955-09-21
1956	1956-04-01	1956-10-13
1957	1957-06-04	1957-09-30
1958	1958-05-11	1958-10-19
1959	1959-04-30	1959-09-20
1960	1960-04-22	1960-09-20
1961	1961-05-28	1961-09-10
1962	1962-04-21	1962-10-11
1963	1963-04-01	1963-10-10

Every Fixed Threshold

Fixed thresholds at Nelson
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	35	117	1956	79
35 C (95 F): Days	34	71	1936	20
40 C (104 F): Days	22	30	1936	4
45 C (113 F): Days	3	5	1936	1
90 F (32.2 C): Days	35	89	1936	51
100 F (37.8 C): Days	28	51	1936	4
110 F (43.3 C): Days	5	8	1936	1
0 C (32 F): Ice days (max	35	55	1960	37
0 C (32 F): Frost days (min	34	162	1916	138
-10 C (14 F): Days with min	34	62	1937	50
-20 C (-4 F): Days with min	34	22	1916	18
-30 C (-22 F): Days with min	6	1	1912	1
20 C (68 F): Tropical nights (min	34	43	1963	43
25 C (77 F): Days with min	14	7	1936	1
10 mm (0.39 in): Days with 10 mm or more rain	95	44	1993	24
25 mm (0.98 in): Days with 25 mm or more rain	94	12	1944	8
50 mm (1.97 in): Days with 50 mm or more rain	59	4	1949	2
100 mm (3.94 in): Days with 100 mm or more rain	4	1	1950	1
10 cm (3.9 in): Days with 10 cm or more snowfall	62	6	1944	3
25 cm (9.8 in): Days with 25 cm or more snowfall	15	2	1952	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1997	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 Nelson 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).

Nelson Threshold Days by Year (USC00255840)

Key Facts for Nelson Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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