Cooktown Post Office Weather Records (ASN00031016)

Record envelope, standing records and threshold days for Cooktown Post Office (ASN00031016), Australia, with 112 years of record.

Key Facts for Cooktown Post Office

Cooktown Post Office (ASN00031016) is a weather station in Australia at -15.46 latitude and 145.25 longitude, 6 m (20 ft) above sea level.
The station reports from 1876 to 1987, 112 years of record.
1,464 records set at Cooktown Post Office still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Cooktown Post Office set a daily record precipitation of 41.6 mm (1.6 in) on 9 July 1987.

About the Station

Location: Australia, -15.46 latitude, 145.25 longitude.
Elevation: 6 m (20 ft).
Period of record: 1876 to 1987, 112 years.
Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Cooktown Post Office. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Cooktown Post Office, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	41.7 C (107.1 F)	17.2 C (63.0 F)	n/a	n/a
Feb	38.3 C (100.9 F)	20.0 C (68.0 F)	n/a	n/a
Mar	37.8 C (100.0 F)	18.9 C (66.0 F)	n/a	n/a
Apr	33.6 C (92.5 F)	16.3 C (61.3 F)	n/a	n/a
May	32.4 C (90.3 F)	12.5 C (54.5 F)	n/a	n/a
Jun	31.6 C (88.9 F)	10.0 C (50.0 F)	n/a	n/a
Jul	31.0 C (87.8 F)	8.3 C (46.9 F)	n/a	n/a
Aug	31.1 C (88.0 F)	11.0 C (51.8 F)	n/a	n/a
Sep	32.8 C (91.0 F)	14.1 C (57.4 F)	n/a	n/a
Oct	35.0 C (95.0 F)	14.1 C (57.4 F)	n/a	n/a
Nov	36.1 C (97.0 F)	16.1 C (61.0 F)	n/a	n/a
Dec	38.2 C (100.8 F)	20.0 C (68.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Cooktown Post Office still stand. 1959 holds the most, with 81.

Standing records at Cooktown Post Office by the year they were set
Year set	Standing records
1957	36
1958	62
1959	81
1960	44
1961	37
1962	39
1963	64
1964	36
1965	53
1966	24
1967	43
1968	37
1969	33
1970	37
1971	75
1972	28
1973	73
1974	53
1975	60
1976	60
1977	30
1978	50
1979	34
1980	30
1981	56
1982	74
1983	77
1984	37
1985	34
1986	54
1987	13

Wettest Day of Each Month

Jan: 405.4 mm (16.0 in)

The wettest day on record for each calendar month at Cooktown Post Office. The most was 405.4 mm (16.0 in) on 22 January 1914.

Record daily precipitation for each month at Cooktown Post Office
Month	Record daily precipitation (mm)	Date
Jan	405.4 mm (16.0 in)	22 January 1914
Feb	397.5 mm (15.6 in)	11 February 1949
Mar	341.6 mm (13.4 in)	4 March 1935
Apr	350.8 mm (13.8 in)	9 April 1982
May	103.1 mm (4.1 in)	4 May 1920
Jun	105.2 mm (4.1 in)	15 June 1965
Jul	46.7 mm (1.8 in)	8 July 1944
Aug	86.6 mm (3.4 in)	6 August 1947
Sep	38.1 mm (1.5 in)	25 September 1890
Oct	64.8 mm (2.6 in)	5 October 1930
Nov	200.9 mm (7.9 in)	5 November 1894
Dec	195.1 mm (7.7 in)	26 December 1907

Period of Record Coverage

1957 to 1987

31 years of record at Cooktown Post Office, 1957 to 1987. 3 years have data for under 90 percent of days and are left out of rankings: 1963, 1968, 1987.

Days with data per year at Cooktown Post Office
Year	Days with data	Share of year	Complete
1957	363	99%	Yes
1958	361	99%	Yes
1959	364	100%	Yes
1960	365	100%	Yes
1961	364	100%	Yes
1962	365	100%	Yes
1963	320	88%	No
1964	365	100%	Yes
1965	364	100%	Yes
1966	358	98%	Yes
1967	364	100%	Yes
1968	320	87%	No
1969	364	100%	Yes
1970	362	99%	Yes
1971	359	98%	Yes
1972	364	99%	Yes
1973	354	97%	Yes
1974	364	100%	Yes
1975	365	100%	Yes
1976	361	99%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	364	99%	Yes
1981	364	100%	Yes
1982	365	100%	Yes
1983	362	99%	Yes
1984	364	99%	Yes
1985	364	100%	Yes
1986	361	99%	Yes
1987	182	50%	No

Latest Records

Latest records at Cooktown Post Office
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
9 July 1987	Cooktown Post Office, AU	daily rain	41.6 mm (1.6 in)	26.4 mm (1.0 in)	42 years	62 of 100 (Major)
27 June 1987	Cooktown Post Office, AU	daily high min	22.0 C (71.6 F)	0.1 C (0.2 F)	17 years	8 of 100 (Routine)
24 June 1987	Cooktown Post Office, AU	daily high max (Tie)	27.5 C (81.5 F)	tie	12 years	1 of 100 (Routine)
22 June 1987	Cooktown Post Office, AU	daily high min	22.5 C (72.5 F)	0.3 C (0.5 F)	28 years	12 of 100 (Routine)
21 June 1987	Cooktown Post Office, AU	daily high max	27.4 C (81.3 F)	0.2 C (0.4 F)	29 years	12 of 100 (Routine)
19 June 1987	Cooktown Post Office, AU	daily high max	28.2 C (82.8 F)	0.7 C (1.3 F)	4 years	8 of 100 (Routine)
1 June 1987	Cooktown Post Office, AU	daily low min (Tie)	16.3 C (61.3 F)	tie	21 years	2 of 100 (Routine)
22 May 1987	Cooktown Post Office, AU	daily high max	28.2 C (82.8 F)	0.1 C (0.2 F)	12 years	6 of 100 (Routine)
3 May 1987	Cooktown Post Office, AU	daily high min	25.3 C (77.5 F)	0.3 C (0.5 F)	8 years	6 of 100 (Routine)
30 April 1987	Cooktown Post Office, AU	daily high min	25.4 C (77.7 F)	0.2 C (0.4 F)	0 years	4 of 100 (Routine)
29 April 1987	Cooktown Post Office, AU	daily high min	25.8 C (78.4 F)	0.1 C (0.2 F)	4 years	4 of 100 (Routine)
16 April 1987	Cooktown Post Office, AU	daily high max	30.7 C (87.3 F)	0.4 C (0.7 F)	4 years	7 of 100 (Routine)
5 April 1987	Cooktown Post Office, AU	daily high min (Tie)	26.0 C (78.8 F)	tie	6 years	1 of 100 (Routine)
4 April 1987	Cooktown Post Office, AU	daily high min	26.5 C (79.7 F)	0.3 C (0.5 F)	5 years	5 of 100 (Routine)
15 March 1987	Cooktown Post Office, AU	daily high min (Tie)	26.1 C (79.0 F)	tie	20 years	2 of 100 (Routine)
12 March 1987	Cooktown Post Office, AU	daily low min	19.9 C (67.8 F)	2.3 C (4.1 F)	16 years	25 of 100 (Routine)
8 February 1987	Cooktown Post Office, AU	daily rain	126.6 mm (5.0 in)	32.1 mm (1.3 in)	56 years	37 of 100 (Notable)
4 February 1987	Cooktown Post Office, AU	daily low min	22.0 C (71.6 F)	0.2 C (0.4 F)	28 years	12 of 100 (Routine)
24 January 1987	Cooktown Post Office, AU	daily high max	37.2 C (99.0 F)	1.1 C (2.0 F)	28 years	16 of 100 (Routine)
24 January 1987	Cooktown Post Office, AU	daily high min (Tie)	26.7 C (80.1 F)	tie	3 years	0 of 100 (Routine)

Climate Trend

26 complete years, 1957 to 1986

One stripe for each of 26 complete years at Cooktown Post Office, 1957 to 1986. Blue stripes are years cooler than the station's own mean of 25.6 C (78.2 F); red stripes are warmer. The coolest year was 1965, at 24.9 C (76.7 F), and the warmest was 1981, at 26.3 C (79.4 F). The strongest colour marks a difference of 0.8 C (1.4 F).

Annual mean temperature at Cooktown Post Office as warming stripes, 1957 to 1986
Year	Annual mean temperature	Difference from the station mean
1957	25.5 C	-0.16 C
1959	25.2 C	-0.41 C
1960	25.6 C	-0.08 C
1961	25.3 C	-0.31 C
1962	25.6 C	-0.07 C
1964	25.8 C	+0.14 C
1965	24.9 C	-0.79 C
1966	25.6 C	-0.06 C
1967	25.0 C	-0.62 C
1969	25.9 C	+0.26 C
1970	26.0 C	+0.37 C
1971	26.0 C	+0.34 C
1972	25.1 C	-0.52 C
1974	25.6 C	-0.08 C
1975	26.0 C	+0.32 C
1976	25.5 C	-0.12 C
1977	25.4 C	-0.23 C
1978	25.9 C	+0.24 C
1979	25.6 C	-0.05 C
1980	26.0 C	+0.34 C
1981	26.3 C	+0.67 C
1982	25.2 C	-0.48 C
1983	26.3 C	+0.63 C
1984	25.9 C	+0.27 C
1985	25.7 C	+0.03 C
1986	26.0 C	+0.39 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1876 to 1987

Yearly extremes at Cooktown Post Office: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	41.7 C (107.1 F)	1958	36.7 C (98.1 F)	31
Coldest night (TNn)	8.3 C (46.9 F)	1965	12.5 C (54.5 F)	31
Wettest day (Rx1day)	405.4 mm (16.0 in)	1914	143.1 mm (5.6 in)	102
Wettest five days (Rx5day)	685.1 mm (27.0 in)	1935	306.0 mm (12.0 in)	102
Longest dry spell (CDD)	153 days	1876	37 days	102

Hottest day (TXx)

The hottest day of the year at Cooktown Post Office, 1876 to 1987. The record is 41.7 C (107.1 F) in 1958, marked on the chart; the median year is 36.7 C (98.1 F).

Hottest day (TXx) at Cooktown Post Office by year
Year	Hottest day (TXx)
1876	n/a
1881	n/a
1883	n/a
1887	n/a
1888	n/a
1889	n/a
1890	n/a
1891	n/a
1892	n/a
1893	n/a
1894	n/a
1895	n/a
1896	n/a
1897	n/a
1898	n/a
1899	n/a
1900	n/a
1901	n/a
1904	n/a
1905	n/a
1906	n/a
1907	n/a
1908	n/a
1909	n/a
1910	n/a
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	36.7 C (98.1 F)
1958	41.7 C (107.1 F)
1959	36.7 C (98.1 F)
1960	37.8 C (100.0 F)
1961	33.9 C (93.0 F)
1962	34.4 C (93.9 F)
1963	37.2 C (99.0 F)
1964	37.3 C (99.1 F)
1965	35.4 C (95.7 F)
1966	36.3 C (97.3 F)
1967	37.8 C (100.0 F)
1968	35.0 C (95.0 F)
1969	38.3 C (100.9 F)
1970	36.7 C (98.1 F)
1971	37.8 C (100.0 F)
1972	36.7 C (98.1 F)
1973	36.5 C (97.7 F)
1974	35.8 C (96.4 F)
1975	36.2 C (97.2 F)
1976	36.0 C (96.8 F)
1977	38.2 C (100.8 F)
1978	36.0 C (96.8 F)
1979	35.0 C (95.0 F)
1980	36.6 C (97.9 F)
1981	37.8 C (100.0 F)
1982	37.9 C (100.2 F)
1983	37.4 C (99.3 F)
1984	36.5 C (97.7 F)
1985	37.0 C (98.6 F)
1986	35.3 C (95.5 F)
1987	38.3 C (100.9 F)

Coldest night (TNn)

The coldest night of the year at Cooktown Post Office, 1876 to 1987. The record is 8.3 C (46.9 F) in 1965, marked on the chart; the median year is 12.5 C (54.5 F).

Coldest night (TNn) at Cooktown Post Office by year
Year	Coldest night (TNn)
1876	n/a
1881	n/a
1883	n/a
1887	n/a
1888	n/a
1889	n/a
1890	n/a
1891	n/a
1892	n/a
1893	n/a
1894	n/a
1895	n/a
1896	n/a
1897	n/a
1898	n/a
1899	n/a
1900	n/a
1901	n/a
1904	n/a
1905	n/a
1906	n/a
1907	n/a
1908	n/a
1909	n/a
1910	n/a
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	12.2 C (54.0 F)
1958	11.7 C (53.1 F)
1959	10.6 C (51.1 F)
1960	10.6 C (51.1 F)
1961	12.8 C (55.0 F)
1962	13.3 C (55.9 F)
1963	9.8 C (49.6 F)
1964	13.4 C (56.1 F)
1965	8.3 C (46.9 F)
1966	13.9 C (57.0 F)
1967	12.2 C (54.0 F)
1968	14.4 C (57.9 F)
1969	13.9 C (57.0 F)
1970	13.9 C (57.0 F)
1971	10.6 C (51.1 F)
1972	13.9 C (57.0 F)
1973	16.1 C (61.0 F)
1974	11.4 C (52.5 F)
1975	12.2 C (54.0 F)
1976	11.5 C (52.7 F)
1977	10.8 C (51.4 F)
1978	12.6 C (54.7 F)
1979	11.0 C (51.8 F)
1980	13.3 C (55.9 F)
1981	14.5 C (58.1 F)
1982	11.6 C (52.9 F)
1983	15.5 C (59.9 F)
1984	10.0 C (50.0 F)
1985	12.5 C (54.5 F)
1986	13.8 C (56.8 F)
1987	16.3 C (61.3 F)

Wettest day (Rx1day)

The wettest day of the year at Cooktown Post Office, 1876 to 1987. The record is 405.4 mm (16.0 in) in 1914, marked on the chart; the median year is 143.1 mm (5.6 in).

Wettest day (Rx1day) at Cooktown Post Office by year
Year	Wettest day (Rx1day)
1876	0.0 mm (0.00 in)
1881	0.0 mm (0.00 in)
1883	0.0 mm (0.00 in)
1887	0.0 mm (0.00 in)
1888	169.2 mm (6.7 in)
1889	79.2 mm (3.1 in)
1890	150.9 mm (5.9 in)
1891	142.7 mm (5.6 in)
1892	106.7 mm (4.2 in)
1893	119.4 mm (4.7 in)
1894	200.9 mm (7.9 in)
1895	179.1 mm (7.1 in)
1896	137.2 mm (5.4 in)
1897	82.8 mm (3.3 in)
1898	175.5 mm (6.9 in)
1899	198.4 mm (7.8 in)
1900	101.1 mm (4.0 in)
1901	89.4 mm (3.5 in)
1904	185.4 mm (7.3 in)
1905	230.1 mm (9.1 in)
1906	91.4 mm (3.6 in)
1907	297.2 mm (11.7 in)
1908	100.8 mm (4.0 in)
1909	148.6 mm (5.9 in)
1910	142.7 mm (5.6 in)
1911	282.2 mm (11.1 in)
1912	135.1 mm (5.3 in)
1913	181.6 mm (7.1 in)
1914	405.4 mm (16.0 in)
1915	92.7 mm (3.6 in)
1916	109.7 mm (4.3 in)
1917	175.3 mm (6.9 in)
1918	85.9 mm (3.4 in)
1919	97.5 mm (3.8 in)
1920	123.2 mm (4.9 in)
1921	209.8 mm (8.3 in)
1922	114.6 mm (4.5 in)
1923	239.0 mm (9.4 in)
1924	148.6 mm (5.9 in)
1925	100.6 mm (4.0 in)
1926	59.7 mm (2.4 in)
1927	91.4 mm (3.6 in)
1928	235.0 mm (9.3 in)
1929	173.0 mm (6.8 in)
1930	231.9 mm (9.1 in)
1931	95.3 mm (3.8 in)
1932	127.0 mm (5.0 in)
1933	152.4 mm (6.0 in)
1934	117.3 mm (4.6 in)
1935	341.6 mm (13.4 in)
1936	163.1 mm (6.4 in)
1937	100.1 mm (3.9 in)
1938	75.4 mm (3.0 in)
1939	235.5 mm (9.3 in)
1940	161.5 mm (6.4 in)
1941	143.5 mm (5.6 in)
1942	127.5 mm (5.0 in)
1943	116.8 mm (4.6 in)
1944	268.7 mm (10.6 in)
1945	148.3 mm (5.8 in)
1946	80.3 mm (3.2 in)
1947	98.3 mm (3.9 in)
1948	98.3 mm (3.9 in)
1949	397.5 mm (15.6 in)
1950	104.1 mm (4.1 in)
1951	86.4 mm (3.4 in)
1952	134.1 mm (5.3 in)
1953	150.9 mm (5.9 in)
1954	96.5 mm (3.8 in)
1955	152.9 mm (6.0 in)
1956	114.6 mm (4.5 in)
1957	276.6 mm (10.9 in)
1958	160.8 mm (6.3 in)
1959	98.3 mm (3.9 in)
1960	209.0 mm (8.2 in)
1961	231.9 mm (9.1 in)
1962	133.1 mm (5.2 in)
1963	156.0 mm (6.1 in)
1964	200.7 mm (7.9 in)
1965	117.9 mm (4.6 in)
1966	79.0 mm (3.1 in)
1967	163.1 mm (6.4 in)
1968	148.6 mm (5.9 in)
1969	81.5 mm (3.2 in)
1970	84.3 mm (3.3 in)
1971	193.0 mm (7.6 in)
1972	158.2 mm (6.2 in)
1973	191.3 mm (7.5 in)
1974	146.0 mm (5.7 in)
1975	151.2 mm (6.0 in)
1976	149.0 mm (5.9 in)
1977	210.2 mm (8.3 in)
1978	84.4 mm (3.3 in)
1979	401.9 mm (15.8 in)
1980	217.6 mm (8.6 in)
1981	250.4 mm (9.9 in)
1982	350.8 mm (13.8 in)
1983	130.0 mm (5.1 in)
1984	141.5 mm (5.6 in)
1985	310.0 mm (12.2 in)
1986	132.6 mm (5.2 in)
1987	126.6 mm (5.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Cooktown Post Office, 1876 to 1987. The record is 685.1 mm (27.0 in) in 1935, marked on the chart; the median year is 306.0 mm (12.0 in).

Wettest five days (Rx5day) at Cooktown Post Office by year
Year	Wettest five days (Rx5day)
1876	0.0 mm (0.00 in)
1881	0.0 mm (0.00 in)
1883	0.0 mm (0.00 in)
1887	0.0 mm (0.00 in)
1888	291.1 mm (11.5 in)
1889	250.8 mm (9.9 in)
1890	205.8 mm (8.1 in)
1891	398.8 mm (15.7 in)
1892	262.4 mm (10.3 in)
1893	327.4 mm (12.9 in)
1894	330.2 mm (13.0 in)
1895	339.1 mm (13.4 in)
1896	238.4 mm (9.4 in)
1897	187.2 mm (7.4 in)
1898	319.0 mm (12.6 in)
1899	476.3 mm (18.8 in)
1900	221.5 mm (8.7 in)
1901	255.6 mm (10.1 in)
1904	242.2 mm (9.5 in)
1905	333.4 mm (13.1 in)
1906	145.0 mm (5.7 in)
1907	550.5 mm (21.7 in)
1908	264.9 mm (10.4 in)
1909	185.7 mm (7.3 in)
1910	309.9 mm (12.2 in)
1911	642.5 mm (25.3 in)
1912	376.2 mm (14.8 in)
1913	360.4 mm (14.2 in)
1914	602.6 mm (23.7 in)
1915	146.5 mm (5.8 in)
1916	303.3 mm (11.9 in)
1917	378.7 mm (14.9 in)
1918	163.8 mm (6.4 in)
1919	133.9 mm (5.3 in)
1920	308.7 mm (12.2 in)
1921	489.7 mm (19.3 in)
1922	459.3 mm (18.1 in)
1923	590.0 mm (23.2 in)
1924	278.0 mm (10.9 in)
1925	266.9 mm (10.5 in)
1926	134.7 mm (5.3 in)
1927	191.3 mm (7.5 in)
1928	504.8 mm (19.9 in)
1929	367.1 mm (14.5 in)
1930	292.4 mm (11.5 in)
1931	226.2 mm (8.9 in)
1932	340.4 mm (13.4 in)
1933	411.7 mm (16.2 in)
1934	248.1 mm (9.8 in)
1935	685.1 mm (27.0 in)
1936	287.9 mm (11.3 in)
1937	268.5 mm (10.6 in)
1938	158.3 mm (6.2 in)
1939	576.4 mm (22.7 in)
1940	396.7 mm (15.6 in)
1941	302.3 mm (11.9 in)
1942	165.9 mm (6.5 in)
1943	324.7 mm (12.8 in)
1944	302.2 mm (11.9 in)
1945	328.8 mm (12.9 in)
1946	218.4 mm (8.6 in)
1947	171.1 mm (6.7 in)
1948	222.0 mm (8.7 in)
1949	606.0 mm (23.9 in)
1950	267.8 mm (10.5 in)
1951	195.3 mm (7.7 in)
1952	412.8 mm (16.3 in)
1953	301.9 mm (11.9 in)
1954	278.8 mm (11.0 in)
1955	212.9 mm (8.4 in)
1956	399.8 mm (15.7 in)
1957	576.4 mm (22.7 in)
1958	316.5 mm (12.5 in)
1959	291.8 mm (11.5 in)
1960	425.4 mm (16.7 in)
1961	296.2 mm (11.7 in)
1962	379.8 mm (15.0 in)
1963	392.8 mm (15.5 in)
1964	281.9 mm (11.1 in)
1965	271.8 mm (10.7 in)
1966	129.0 mm (5.1 in)
1967	453.9 mm (17.9 in)
1968	430.2 mm (16.9 in)
1969	281.4 mm (11.1 in)
1970	225.0 mm (8.9 in)
1971	319.4 mm (12.6 in)
1972	461.8 mm (18.2 in)
1973	445.8 mm (17.6 in)
1974	359.4 mm (14.1 in)
1975	325.9 mm (12.8 in)
1976	435.5 mm (17.1 in)
1977	543.5 mm (21.4 in)
1978	249.2 mm (9.8 in)
1979	585.4 mm (23.0 in)
1980	316.7 mm (12.5 in)
1981	610.2 mm (24.0 in)
1982	437.2 mm (17.2 in)
1983	280.4 mm (11.0 in)
1984	315.8 mm (12.4 in)
1985	393.4 mm (15.5 in)
1986	341.1 mm (13.4 in)
1987	267.0 mm (10.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Cooktown Post Office, 1876 to 1987. The record is 153 days in 1876, marked on the chart; the median year is 37 days.

Longest dry spell (CDD) at Cooktown Post Office by year
Year	Longest dry spell (CDD)
1876	153 days
1881	30 days
1883	30 days
1887	30 days
1888	64 days
1889	39 days
1890	29 days
1891	43 days
1892	72 days
1893	39 days
1894	27 days
1895	60 days
1896	49 days
1897	34 days
1898	37 days
1899	37 days
1900	33 days
1901	30 days
1904	31 days
1905	87 days
1906	28 days
1907	21 days
1908	26 days
1909	37 days
1910	24 days
1911	47 days
1912	28 days
1913	43 days
1914	19 days
1915	39 days
1916	26 days
1917	35 days
1918	39 days
1919	29 days
1920	24 days
1921	24 days
1922	42 days
1923	99 days
1924	32 days
1925	39 days
1926	34 days
1927	40 days
1928	59 days
1929	61 days
1930	23 days
1931	32 days
1932	60 days
1933	43 days
1934	35 days
1935	38 days
1936	34 days
1937	46 days
1938	22 days
1939	42 days
1940	27 days
1941	64 days
1942	32 days
1943	51 days
1944	44 days
1945	36 days
1946	114 days
1947	24 days
1948	66 days
1949	44 days
1950	28 days
1951	36 days
1952	35 days
1953	37 days
1954	32 days
1955	38 days
1956	19 days
1957	39 days
1958	93 days
1959	47 days
1960	54 days
1961	30 days
1962	42 days
1963	46 days
1964	39 days
1965	39 days
1966	41 days
1967	25 days
1968	56 days
1969	29 days
1970	39 days
1971	42 days
1972	50 days
1973	23 days
1974	50 days
1975	29 days
1976	32 days
1977	40 days
1978	25 days
1979	34 days
1980	33 days
1981	41 days
1982	25 days
1983	31 days
1984	27 days
1985	27 days
1986	32 days
1987	21 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Rainfall Return Levels

97 years, 1888 to 1986

A day with at least 143.0 mm (5.6 in) of rain is expected about once in 2 years. A day with at least 451.5 mm (17.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Cooktown Post Office: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	143.0 mm (5.6 in)
5 years	206.6 mm (8.1 in)
10 years	255.4 mm (10.1 in)
25 years	325.9 mm (12.8 in)
50 years	385.5 mm (15.2 in)
100 years	451.5 mm (17.8 in)	Longer than the 97 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 97 years of values from 1888 to 1986.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 405.4 mm (16.0 in) in 1914; 401.9 mm (15.8 in) in 1979; 397.5 mm (15.6 in) in 1949.

Download the Data

Data for Cooktown Post Office standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Cooktown Post Office 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-13. Last revised 13 October 2026 (2026-10-13).