Roby Threshold Days by Year (USC00417678)

16 fixed thresholds counted per year at Roby (USC00417678): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Roby Thresholds

Roby: days with 10 mm (0.39 in) or more of precipitation in 47 years, most in 1941 with 29.
Roby: days with 25 mm (0.98 in) or more of precipitation in 46 years, most in 1915 with 14.
Roby: days with 50 mm (1.97 in) or more of precipitation in 32 years, most in 1908 with 4.
Roby: nights with a minimum temperature at or below 0 C (32 F) in 17 years, most in 1912 with 77.
16 fixed thresholds have at least one qualifying day at Roby.

Days at or above 30 C (86 F)

16 years with a qualifying day

Days per year at Roby with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 166 in 1918.

Days at or above 30 C (86 F) per year at Roby
Year	Days	Decade average
1894	143	143
1904	157	136
1905	107	136
1908	143	136
1909	137	136
1910	119	130.5
1911	155	130.5
1912	142	130.5
1913	131	130.5
1914	75	130.5
1915	105	130.5
1916	143	130.5
1917	155	130.5
1918	166	130.5
1919	114	130.5
1921	136	136

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

First to last qualifying date each year at Roby
Year	First date	Last date
1894	1894-03-11	1894-11-01
1904	1904-02-06	1904-10-12
1905	1905-04-08	1905-10-14
1908	1908-03-13	1908-10-21
1909	1909-03-05	1909-10-06
1910	1910-04-18	1910-10-17
1911	1911-01-31	1911-10-17
1912	1912-01-25	1912-10-21
1913	1913-04-06	1913-10-22
1914	1914-03-08	1914-09-27
1915	1915-05-13	1915-10-04
1916	1916-03-07	1916-09-28
1917	1917-03-12	1917-10-28
1918	1918-02-23	1918-10-11
1919	1919-04-12	1919-11-04
1921	1921-03-16	1921-11-17

Every Fixed Threshold

Fixed thresholds at Roby
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	16	166	1918	136
35 C (95 F): Days	16	100	1917	67
40 C (104 F): Days	12	24	1918	3
90 F (32.2 C): Days	16	140	1918	111
100 F (37.8 C): Days	16	69	1918	21
110 F (43.3 C): Days	4	2	1894	2
0 C (32 F): Ice days (max	11	15	1905	2
0 C (32 F): Frost days (min	17	77	1912	47
-10 C (14 F): Days with min	16	12	1905	1
20 C (68 F): Tropical nights (min	17	111	1911	33
25 C (77 F): Days with min	15	11	1911	1
10 mm (0.39 in): Days with 10 mm or more rain	47	29	1941	15
25 mm (0.98 in): Days with 25 mm or more rain	46	14	1915	7
50 mm (1.97 in): Days with 50 mm or more rain	32	4	1908	1
100 mm (3.94 in): Days with 100 mm or more rain	6	1	1904	1
10 cm (3.9 in): Days with 10 cm or more snowfall	9	2	1918	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1894.

Download the Data

Data for Roby 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).

Roby Threshold Days by Year (USC00417678)

Key Facts for Roby Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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