Romulus Threshold Days by Year (USC00307250)

12 fixed thresholds counted per year at Romulus (USC00307250): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Romulus Thresholds

Romulus: days with a maximum temperature at or above 30 C (86 F) in 20 years, most in 1900 with 45.
Romulus: days with a maximum temperature at or below 0 C (32 F) in 20 years, most in 1904 with 68.
Romulus: nights with a minimum temperature at or below 0 C (32 F) in 20 years, most in 1917 with 171.
Romulus: nights with a minimum temperature at or below -10 C (14 F) in 20 years, most in 1904 with 58.
12 fixed thresholds have at least one qualifying day at Romulus.

Days at or above 30 C (86 F)

20 years with a qualifying day

Days per year at Romulus with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 45 in 1900.

Days at or above 30 C (86 F) per year at Romulus
Year	Days	Decade average
1896	28	31.3
1897	25	31.3
1898	38	31.3
1899	34	31.3
1900	45	23
1901	34	23
1902	8	23
1903	13	23
1904	12	23
1905	17	23
1906	23	23
1908	33	23
1909	22	23
1910	19	18.8
1912	15	18.8
1913	27	18.8
1914	18	18.8
1917	11	18.8
1918	23	18.8
1921	40	40

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

First to last qualifying date each year at Romulus
Year	First date	Last date
1896	1896-04-16	1896-09-11
1897	1897-06-24	1897-10-15
1898	1898-06-07	1898-09-04
1899	1899-05-01	1899-09-17
1900	1900-05-14	1900-10-06
1901	1901-06-06	1901-09-07
1902	1902-05-22	1902-08-31
1903	1903-05-17	1903-09-15
1904	1904-05-25	1904-09-03
1905	1905-06-15	1905-10-01
1906	1906-05-18	1906-09-19
1908	1908-05-25	1908-09-26
1909	1909-06-21	1909-09-14
1910	1910-06-22	1910-09-06
1912	1912-06-28	1912-09-10
1913	1913-05-04	1913-09-07
1914	1914-05-26	1914-09-22
1917	1917-07-22	1917-08-20
1918	1918-05-31	1918-08-23
1921	1921-05-21	1921-09-10

Every Fixed Threshold

Fixed thresholds at Romulus
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	20	45	1900	40
35 C (95 F): Days	9	7	1900	4
90 F (32.2 C): Days	19	23	1898	21
0 C (32 F): Ice days (max	20	68	1904	29
0 C (32 F): Frost days (min	20	171	1917	124
-10 C (14 F): Days with min	20	58	1904	26
-20 C (-4 F): Days with min	15	10	1918	10
20 C (68 F): Tropical nights (min	20	22	1921	22
25 C (77 F): Days with min	1	1	1901	1
10 mm (0.39 in): Days with 10 mm or more rain	16	41	1896	21
25 mm (0.98 in): Days with 25 mm or more rain	16	12	1903	3
50 mm (1.97 in): Days with 50 mm or more rain	4	4	1900	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1896.

Download the Data

Data for Romulus 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).

Romulus Threshold Days by Year (USC00307250)

Key Facts for Romulus Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related