Neptune 3 S Threshold Days by Year (USC00406454)

16 fixed thresholds counted per year at Neptune 3 S (USC00406454): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Neptune 3 S Thresholds

Neptune 3 S: days with 10 mm (0.39 in) or more of precipitation in 35 years, most in 1950 with 59.
Neptune 3 S: days with 25 mm (0.98 in) or more of precipitation in 35 years, most in 1950 with 23.
Neptune 3 S: days with 50 mm (1.97 in) or more of precipitation in 33 years, most in 1937 with 8.
Neptune 3 S: days with a maximum temperature at or above 30 C (86 F) in 15 years, most in 1959 with 100.
16 fixed thresholds have at least one qualifying day at Neptune 3 S.

Days at or above 30 C (86 F)

15 years with a qualifying day

Days per year at Neptune 3 S with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 100 in 1959.

Days at or above 30 C (86 F) per year at Neptune 3 S
Year	Days	Decade average
1956	94	80.5
1957	70	80.5
1958	58	80.5
1959	100	80.5
1960	91	82.6
1961	73	82.6
1962	95	82.6
1963	80	82.6
1964	93	82.6
1965	92	82.6
1966	73	82.6
1967	57	82.6
1968	80	82.6
1969	92	82.6
1970	87	87

For each year, a bar from the first to the last day at Neptune 3 S meeting 30 C (86 F).

First to last qualifying date each year at Neptune 3 S
Year	First date	Last date
1956	1956-04-28	1956-10-01
1957	1957-04-23	1957-09-12
1958	1958-04-24	1958-09-27
1959	1959-04-08	1959-10-11
1960	1960-04-23	1960-10-03
1961	1961-06-02	1961-10-13
1962	1962-05-09	1962-10-13
1963	1963-04-22	1963-10-23
1964	1964-04-21	1964-09-22
1965	1965-04-24	1965-10-18
1966	1966-05-06	1966-09-11
1967	1967-03-14	1967-10-06
1968	1968-05-03	1968-10-02
1969	1969-05-06	1969-10-05
1970	1970-04-30	1970-09-25

Every Fixed Threshold

Fixed thresholds at Neptune 3 S
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	15	100	1959	87
35 C (95 F): Days	14	25	1956	7
90 F (32.2 C): Days	15	60	1956	59
100 F (37.8 C): Days	6	3	1966	1
0 C (32 F): Ice days (max	15	24	1963	14
0 C (32 F): Frost days (min	15	139	1969	118
-10 C (14 F): Days with min	15	45	1963	29
-20 C (-4 F): Days with min	5	7	1970	7
-30 C (-22 F): Days with min	1	1	1963	1
20 C (68 F): Tropical nights (min	15	47	1956	5
10 mm (0.39 in): Days with 10 mm or more rain	35	59	1950	40
25 mm (0.98 in): Days with 25 mm or more rain	35	23	1950	11
50 mm (1.97 in): Days with 50 mm or more rain	33	8	1937	2
100 mm (3.94 in): Days with 100 mm or more rain	5	1	1941	1
10 cm (3.9 in): Days with 10 cm or more snowfall	12	3	1966	2
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1948	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1956.

Download the Data

Data for Neptune 3 S 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).

Neptune 3 S Threshold Days by Year (USC00406454)

Key Facts for Neptune 3 S Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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