Leonardtown 4 SSW Threshold Days by Year (USC00185200)

15 fixed thresholds counted per year at Leonardtown 4 SSW (USC00185200): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Leonardtown 4 SSW Thresholds

Leonardtown 4 SSW: days with a maximum temperature at or above 30 C (86 F) in 16 years, most in 1941 with 87.
Leonardtown 4 SSW: days with a maximum temperature at or above 90 F (32.2 C) in 16 years, most in 1953 with 49.
Leonardtown 4 SSW: nights with a minimum temperature at or below 0 C (32 F) in 16 years, most in 1915 with 107.
Leonardtown 4 SSW: nights with a minimum temperature at or above 20 C (68 F) in 16 years, most in 1955 with 58.
15 fixed thresholds have at least one qualifying day at Leonardtown 4 SSW.

Days at or above 30 C (86 F)

16 years with a qualifying day

Days per year at Leonardtown 4 SSW with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 87 in 1941.

Days at or above 30 C (86 F) per year at Leonardtown 4 SSW
Year	Days	Decade average
1912	49	59
1913	60	59
1914	63	59
1915	64	59
1940	48	66
1941	87	66
1949	63	66
1950	48	67.4
1951	70	67.4
1952	73	67.4
1953	67	67.4
1954	78	67.4
1955	65	67.4
1956	68	67.4
1957	81	67.4
1958	57	67.4

For each year, a bar from the first to the last day at Leonardtown 4 SSW meeting 30 C (86 F).

First to last qualifying date each year at Leonardtown 4 SSW
Year	First date	Last date
1912	1912-05-20	1912-09-10
1913	1913-05-02	1913-09-08
1914	1914-05-12	1914-09-23
1915	1915-04-25	1915-09-18
1940	1940-05-06	1940-09-21
1941	1941-04-14	1941-10-08
1949	1949-05-06	1949-10-11
1950	1950-05-06	1950-09-04
1951	1951-04-29	1951-10-06
1952	1952-04-22	1952-09-15
1953	1953-04-25	1953-09-15
1954	1954-05-02	1954-10-13
1955	1955-05-05	1955-09-16
1956	1956-04-28	1956-09-17
1957	1957-04-21	1957-09-22
1958	1958-04-20	1958-09-26

Every Fixed Threshold

Fixed thresholds at Leonardtown 4 SSW
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	16	87	1941	57
35 C (95 F): Days	14	19	1954	8
90 F (32.2 C): Days	16	49	1953	26
100 F (37.8 C): Days	5	2	1914	1
0 C (32 F): Ice days (max	15	18	1912	14
0 C (32 F): Frost days (min	16	107	1915	97
-10 C (14 F): Days with min	11	18	1940	17
-20 C (-4 F): Days with min	3	1	1912	1
20 C (68 F): Tropical nights (min	16	58	1955	45
25 C (77 F): Days with min	11	3	1940	2
10 mm (0.39 in): Days with 10 mm or more rain	16	46	1958	46
25 mm (0.98 in): Days with 25 mm or more rain	16	16	1958	16
50 mm (1.97 in): Days with 50 mm or more rain	14	3	1941	2
100 mm (3.94 in): Days with 100 mm or more rain	2	2	1955	1
10 cm (3.9 in): Days with 10 cm or more snowfall	4	2	1953	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1912.

Download the Data

Data for Leonardtown 4 SSW 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).

Leonardtown 4 SSW Threshold Days by Year (USC00185200)

Key Facts for Leonardtown 4 SSW Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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