Westboro Threshold Days by Year

16 fixed thresholds counted per year at Westboro (USC00199080): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Westboro Thresholds

Westboro: days with a maximum temperature at or above 30 C (86 F) in 30 years, most in 1911 with 56.
Westboro: days with a maximum temperature at or below 0 C (32 F) in 30 years, most in 1904 with 57.
Westboro: nights with a minimum temperature at or below 0 C (32 F) in 30 years, most in 1904 with 169.
Westboro: nights with a minimum temperature at or below -10 C (14 F) in 30 years, most in 1904 with 63.
16 fixed thresholds have at least one qualifying day at Westboro.

Days at or above 30 C (86 F)

30 years with a qualifying day

Days per year at Westboro with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 56 in 1911.

Days at or above 30 C (86 F) per year at Westboro
Year	Days	Decade average
1893	34	30.6
1894	35	30.6
1895	35	30.6
1896	34	30.6
1897	24	30.6
1898	26	30.6
1899	26	30.6
1900	38	29.6
1902	16	29.6
1903	20	29.6
1904	17	29.6
1905	24	29.6
1906	31	29.6
1907	36	29.6
1908	49	29.6
1909	35	29.6
1910	36	28.6
1911	56	28.6
1912	31	28.6
1913	43	28.6
1914	36	28.6
1916	18	28.6
1917	10	28.6
1918	15	28.6
1919	12	28.6
1920	2	10.2
1921	25	10.2
1922	8	10.2
1923	13	10.2
1924	3	10.2

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

First to last qualifying date each year at Westboro
Year	First date	Last date
1893	1893-05-11	1893-08-28
1894	1894-05-02	1894-09-10
1895	1895-05-04	1895-09-23
1896	1896-04-16	1896-09-11
1897	1897-06-04	1897-10-16
1898	1898-06-08	1898-09-07
1899	1899-05-01	1899-08-31
1900	1900-05-15	1900-09-12
1902	1902-05-24	1902-09-01
1903	1903-04-30	1903-09-15
1904	1904-05-25	1904-08-01
1905	1905-06-15	1905-08-24
1906	1906-05-16	1906-09-19
1907	1907-05-14	1907-09-21
1908	1908-04-23	1908-10-18
1909	1909-04-19	1909-08-26
1910	1910-05-24	1910-08-25
1911	1911-04-28	1911-08-23
1912	1912-05-24	1912-09-11
1913	1913-04-25	1913-09-08
1914	1914-04-19	1914-09-24
1916	1916-07-02	1916-09-08
1917	1917-06-20	1917-08-29
1918	1918-05-18	1918-08-14
1919	1919-05-29	1919-08-04
1920	1920-06-03	1920-08-07
1921	1921-05-21	1921-09-03
1922	1922-06-07	1922-08-16
1923	1923-05-25	1923-08-05
1924	1924-06-24	1924-08-07

Every Fixed Threshold

Fixed thresholds at Westboro
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	30	56	1911	3
35 C (95 F): Days	19	14	1911	1
40 C (104 F): Days	1	1	1911	1
90 F (32.2 C): Days	28	27	1911	4
100 F (37.8 C): Days	1	6	1911	6
0 C (32 F): Ice days (max	30	57	1904	42
0 C (32 F): Frost days (min	30	169	1904	115
-10 C (14 F): Days with min	30	63	1904	35
-20 C (-4 F): Days with min	28	12	1904	2
20 C (68 F): Tropical nights (min	30	36	1921	20
25 C (77 F): Days with min	5	3	1916	3
10 mm (0.39 in): Days with 10 mm or more rain	28	42	1898	31
25 mm (0.98 in): Days with 25 mm or more rain	28	19	1919	14
50 mm (1.97 in): Days with 50 mm or more rain	28	8	1900	3
100 mm (3.94 in): Days with 100 mm or more rain	5	2	1922	2
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1895	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1893.

Download the Data

Data for Westboro 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Westboro Threshold Days by Year

Key Facts for Westboro Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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