Ceylon Threshold Days by Year (CA004011440)

17 fixed thresholds counted per year at Ceylon (CA004011440): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ceylon Thresholds

Ceylon: days with 10 mm (0.39 in) or more of precipitation in 47 years, most in 1927 with 25.
Ceylon: days with 25 mm (0.98 in) or more of precipitation in 39 years, most in 1926 with 5.
Ceylon: days with 10 cm (3.9 in) or more of snowfall in 39 years, most in 1927 with 10.
Ceylon: days with a maximum temperature at or above 30 C (86 F) in 30 years, most in 1961 with 46.
17 fixed thresholds have at least one qualifying day at Ceylon.

Days at or above 30 C (86 F)

30 years with a qualifying day

Days per year at Ceylon with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 46 in 1961.

Days at or above 30 C (86 F) per year at Ceylon
Year	Days	Decade average
1941	20	15.4
1943	11	15.4
1944	6	15.4
1948	15	15.4
1949	25	15.4
1950	3	15.5
1951	7	15.5
1952	14	15.5
1953	9	15.5
1954	5	15.5
1955	22	15.5
1956	19	15.5
1957	25	15.5
1958	23	15.5
1959	28	15.5
1960	19	20.7
1961	46	20.7
1962	8	20.7
1963	15	20.7
1964	21	20.7
1965	11	20.7
1966	17	20.7
1967	28	20.7
1968	16	20.7
1969	26	20.7
1973	19	13.6
1974	12	13.6
1975	13	13.6
1976	11	13.6
1977	13	13.6

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

First to last qualifying date each year at Ceylon
Year	First date	Last date
1941	1941-05-24	1941-09-18
1943	1943-07-03	1943-08-18
1944	1944-05-29	1944-07-29
1948	1948-06-01	1948-09-11
1949	1949-04-28	1949-09-24
1950	1950-07-27	1950-09-04
1951	1951-05-23	1951-07-31
1952	1952-04-26	1952-09-26
1953	1953-05-06	1953-08-21
1954	1954-07-05	1954-08-30
1955	1955-06-14	1955-09-14
1956	1956-06-01	1956-09-26
1957	1957-05-30	1957-09-07
1958	1958-05-12	1958-09-12
1959	1959-06-02	1959-08-28
1960	1960-05-12	1960-09-04
1961	1961-05-29	1961-08-31
1962	1962-06-26	1962-08-21
1963	1963-05-30	1963-09-30
1964	1964-05-20	1964-09-17
1965	1965-07-21	1965-08-12
1966	1966-06-20	1966-09-11
1967	1967-06-27	1967-09-10
1968	1968-06-02	1968-09-11
1969	1969-05-26	1969-09-13
1973	1973-06-23	1973-08-30
1974	1974-06-19	1974-08-06
1975	1975-06-24	1975-08-06
1976	1976-07-17	1976-09-17
1977	1977-05-10	1977-07-23

Every Fixed Threshold

Fixed thresholds at Ceylon
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	30	46	1961	13
35 C (95 F): Days	24	6	1949	3
40 C (104 F): Days	1	1	1941	1
90 F (32.2 C): Days	30	22	1961	3
100 F (37.8 C): Days	11	4	1958	2
0 C (32 F): Ice days (max	30	150	1951	91
0 C (32 F): Frost days (min	30	236	1965	186
-10 C (14 F): Days with min	30	132	1951	92
-20 C (-4 F): Days with min	30	73	1951	44
-30 C (-22 F): Days with min	29	26	1965	12
-40 C (-40 F): Days with min	3	2	1962	2
20 C (68 F): Tropical nights (min	7	7	1943	1
10 mm (0.39 in): Days with 10 mm or more rain	47	25	1927	8
25 mm (0.98 in): Days with 25 mm or more rain	39	5	1926	2
50 mm (1.97 in): Days with 50 mm or more rain	11	2	1933	1
10 cm (3.9 in): Days with 10 cm or more snowfall	39	10	1927	1
25 cm (9.8 in): Days with 25 cm or more snowfall	6	2	1943	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1941.

Download the Data

Data for Ceylon 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Ceylon Threshold Days by Year (CA004011440)

Key Facts for Ceylon Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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