Annapolis 3 SW Threshold Days by Year (USC00230179)

15 fixed thresholds counted per year at Annapolis 3 SW (USC00230179): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Annapolis 3 SW Thresholds

Annapolis 3 SW: days with 10 mm (0.39 in) or more of precipitation in 28 years, most in 1951 with 57.
Annapolis 3 SW: days with 25 mm (0.98 in) or more of precipitation in 28 years, most in 1973 with 30.
Annapolis 3 SW: days with 50 mm (1.97 in) or more of precipitation in 27 years, most in 1945 with 8.
Annapolis 3 SW: days with a maximum temperature at or above 30 C (86 F) in 11 years, most in 1978 with 94.
15 fixed thresholds have at least one qualifying day at Annapolis 3 SW.

Days at or above 30 C (86 F)

11 years with a qualifying day

Days per year at Annapolis 3 SW with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 94 in 1978.

For each year, a bar from the first to the last day at Annapolis 3 SW meeting 30 C (86 F).

First to last qualifying date each year at Annapolis 3 SW
Year	First date	Last date
1966	1966-05-06	1966-09-06
1967	1967-03-12	1967-10-05
1968	1968-05-02	1968-09-24
1971	1971-04-13	1971-10-03
1972	1972-03-13	1972-09-21
1973	1973-05-10	1973-10-03
1974	1974-04-01	1974-08-26
1975	1975-04-24	1975-10-21
1976	1976-04-23	1976-10-14
1977	1977-04-10	1977-09-09
1978	1978-04-01	1978-10-22

Every Fixed Threshold

Fixed thresholds at Annapolis 3 SW
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	11	94	1978	94
35 C (95 F): Days	10	13	1966	11
90 F (32.2 C): Days	11	64	1978	64
100 F (37.8 C): Days	3	4	1966	1
0 C (32 F): Ice days (max	11	27	1978	27
0 C (32 F): Frost days (min	10	147	1966	113
-10 C (14 F): Days with min	10	50	1968	43
-20 C (-4 F): Days with min	6	10	1977	10
-30 C (-22 F): Days with min	1	2	1977	2
20 C (68 F): Tropical nights (min	10	17	1977	17
10 mm (0.39 in): Days with 10 mm or more rain	28	57	1951	27
25 mm (0.98 in): Days with 25 mm or more rain	28	30	1973	8
50 mm (1.97 in): Days with 50 mm or more rain	27	8	1945	2
100 mm (3.94 in): Days with 100 mm or more rain	6	1	1945	1
10 cm (3.9 in): Days with 10 cm or more snowfall	9	3	1975	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1966.

Download the Data

Data for Annapolis 3 SW 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).

Annapolis 3 SW Threshold Days by Year (USC00230179)

Key Facts for Annapolis 3 SW Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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