Rockport Marine Lab Threshold Days by Year (USC00417705)

12 fixed thresholds counted per year at Rockport Marine Lab (USC00417705): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rockport Marine Lab Thresholds

Rockport Marine Lab: days with 10 mm (0.39 in) or more of precipitation in 22 years, most in 1904 with 33.
Rockport Marine Lab: days with 25 mm (0.98 in) or more of precipitation in 22 years, most in 1905 with 20.
Rockport Marine Lab: days with 50 mm (1.97 in) or more of precipitation in 22 years, most in 1903 with 6.
Rockport Marine Lab: nights with a minimum temperature at or above 20 C (68 F) in 13 years, most in 1913 with 202.
12 fixed thresholds have at least one qualifying day at Rockport Marine Lab.

Days at or above 30 C (86 F)

12 years with a qualifying day

Days per year at Rockport Marine Lab with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 120 in 1949.

Days at or above 30 C (86 F) per year at Rockport Marine Lab
Year	Days	Decade average
1902	83	87.6
1903	81	87.6
1904	78	87.6
1905	103	87.6
1906	93	87.6
1911	78	76.3
1912	87	76.3
1913	64	76.3
1948	86	103
1949	120	103
1951	110	99
1952	88	99

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

First to last qualifying date each year at Rockport Marine Lab
Year	First date	Last date
1902	1902-05-25	1902-10-12
1903	1903-06-18	1903-09-16
1904	1904-05-30	1904-10-14
1905	1905-05-26	1905-09-17
1906	1906-06-09	1906-09-22
1911	1911-05-31	1911-09-26
1912	1912-05-22	1912-10-11
1913	1913-05-20	1913-10-08
1948	1948-05-06	1948-11-04
1949	1949-04-10	1949-11-14
1951	1951-05-09	1951-10-29
1952	1952-05-30	1952-10-03

Every Fixed Threshold

Fixed thresholds at Rockport Marine Lab
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	12	120	1949	88
35 C (95 F): Days	4	3	1951	1
90 F (32.2 C): Days	12	47	1949	17
0 C (32 F): Ice days (max	4	2	1911	1
0 C (32 F): Frost days (min	11	11	1905	7
20 C (68 F): Tropical nights (min	13	202	1913	164
25 C (77 F): Days with min	13	107	1951	60
10 mm (0.39 in): Days with 10 mm or more rain	22	33	1904	31
25 mm (0.98 in): Days with 25 mm or more rain	22	20	1905	14
50 mm (1.97 in): Days with 50 mm or more rain	22	6	1903	4
100 mm (3.94 in): Days with 100 mm or more rain	12	3	1903	1
200 mm (7.87 in): Days with 200 mm or more rain	3	1	1951	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1902.

Download the Data

Data for Rockport Marine Lab 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).

Rockport Marine Lab Threshold Days by Year (USC00417705)

Key Facts for Rockport Marine Lab Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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