Derna Threshold Days by Year (LYE00147751)

11 fixed thresholds counted per year at Derna (LYE00147751): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Derna Thresholds

Derna: days with a maximum temperature at or above 30 C (86 F) in 20 years, most in 1963 with 46.
Derna: days with a maximum temperature at or above 90 F (32.2 C) in 20 years, most in 1955 with 21.
Derna: days with a maximum temperature at or above 35 C (95 F) in 19 years, most in 1960 with 13.
Derna: nights with a minimum temperature at or above 20 C (68 F) in 17 years, most in 1932 with 123.
11 fixed thresholds have at least one qualifying day at Derna.

Days at or above 30 C (86 F)

20 years with a qualifying day

Days per year at Derna with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 46 in 1963.

Days at or above 30 C (86 F) per year at Derna
Year	Days	Decade average
1928	32	32
1929	32	32
1931	33	29
1932	40	29
1933	23	29
1934	35	29
1935	21	29
1936	22	29
1952	32	29.6
1953	20	29.6
1954	17	29.6
1955	42	29.6
1956	37	29.6
1957	37	29.6
1958	27	29.6
1959	25	29.6
1960	28	33.8
1961	23	33.8
1962	38	33.8
1963	46	33.8

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

First to last qualifying date each year at Derna
Year	First date	Last date
1928	1928-04-16	1928-11-11
1929	1929-04-23	1929-11-10
1931	1931-03-12	1931-10-29
1932	1932-03-20	1932-11-19
1933	1933-06-17	1933-11-14
1934	1934-04-23	1934-11-14
1935	1935-04-18	1935-10-23
1936	1936-02-28	1936-10-17
1952	1952-03-27	1952-10-16
1953	1953-02-15	1953-10-07
1954	1954-04-30	1954-10-16
1955	1955-03-30	1955-11-15
1956	1956-04-05	1956-11-02
1957	1957-04-11	1957-11-10
1958	1958-03-18	1958-10-19
1959	1959-03-10	1959-11-02
1960	1960-04-19	1960-10-17
1961	1961-03-22	1961-11-16
1962	1962-03-06	1962-11-20
1963	1963-01-04	1963-12-21

Every Fixed Threshold

Fixed thresholds at Derna
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	20	46	1963	46
35 C (95 F): Days	19	13	1960	5
40 C (104 F): Days	8	2	1959	1
90 F (32.2 C): Days	20	21	1955	14
100 F (37.8 C): Days	15	6	1960	1
0 C (32 F): Frost days (min	1	1	1934	1
20 C (68 F): Tropical nights (min	17	123	1932	106
25 C (77 F): Days with min	12	29	1952	12
10 mm (0.39 in): Days with 10 mm or more rain	12	15	1957	7
25 mm (0.98 in): Days with 25 mm or more rain	10	5	1957	3
50 mm (1.97 in): Days with 50 mm or more rain	3	1	1953	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1928.

Download the Data

Data for Derna 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).

Derna Threshold Days by Year (LYE00147751)

Key Facts for Derna Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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