Twin Hills Post Office Weather Records (ASN00036047)

Record envelope, standing records and threshold days for Twin Hills Post Office (ASN00036047), Australia, with 91 years of record.

Key Facts for Twin Hills Post Office

Twin Hills Post Office (ASN00036047) is a weather station in Australia at -21.95 latitude and 146.95 longitude, 195 m (640 ft) above sea level.
The station reports from 1895 to 1985, 91 years of record.
1,464 records set at Twin Hills Post Office still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Twin Hills Post Office set a daily record precipitation of 31.8 mm (1.3 in) on 17 May 1985.

About the Station

Location: Australia, -21.95 latitude, 146.95 longitude.
Elevation: 195 m (640 ft).
Period of record: 1895 to 1985, 91 years.
Eligible elements: 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 Twin Hills 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 Twin Hills Post Office, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	42.8 C (109.0 F)	14.9 C (58.8 F)	n/a	n/a
Feb	43.4 C (110.1 F)	14.7 C (58.5 F)	n/a	n/a
Mar	40.0 C (104.0 F)	6.8 C (44.2 F)	n/a	n/a
Apr	37.0 C (98.6 F)	6.2 C (43.2 F)	n/a	n/a
May	33.3 C (91.9 F)	-0.6 C (30.9 F)	n/a	n/a
Jun	31.7 C (89.1 F)	-2.0 C (28.4 F)	n/a	n/a
Jul	32.5 C (90.5 F)	-3.2 C (26.2 F)	n/a	n/a
Aug	36.3 C (97.3 F)	-0.6 C (30.9 F)	n/a	n/a
Sep	37.5 C (99.5 F)	1.1 C (34.0 F)	n/a	n/a
Oct	39.7 C (103.5 F)	5.3 C (41.5 F)	n/a	n/a
Nov	43.3 C (109.9 F)	7.9 C (46.2 F)	n/a	n/a
Dec	43.8 C (110.8 F)	12.9 C (55.2 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Twin Hills Post Office still stand. 1983 holds the most, with 107.

Standing records at Twin Hills Post Office by the year they were set
Year set	Standing records
1965	29
1966	86
1967	55
1968	91
1969	87
1970	76
1971	94
1972	69
1973	88
1974	66
1975	66
1976	51
1977	44
1978	64
1979	67
1980	72
1981	67
1982	68
1983	107
1984	62
1985	55

All-Time Record Progression

2 new records

2 all-time records were set at Twin Hills Post Office between 11 February 1950 and 3 April 1958. Each dot is a new record.

When Twin Hills Post Office set new all-time records
Date	Kind	Detail
1950-02-11	Record daily precipitation	Record daily precipitation 236.2 mm (9.3 in)
1958-04-03	Record daily precipitation	Record daily precipitation 311.2 mm (12.3 in)

Wettest Day of Each Month

Apr: 311.2 mm (12.3 in)

The wettest day on record for each calendar month at Twin Hills Post Office. The most was 311.2 mm (12.3 in) on 3 April 1958.

Record daily precipitation for each month at Twin Hills Post Office
Month	Record daily precipitation (mm)	Date
Jan	131.3 mm (5.2 in)	10 January 1957
Feb	236.2 mm (9.3 in)	11 February 1950
Mar	141.2 mm (5.6 in)	19 March 1910
Apr	311.2 mm (12.3 in)	3 April 1958
May	110.5 mm (4.4 in)	31 May 1930
Jun	127.0 mm (5.0 in)	10 June 1912
Jul	85.9 mm (3.4 in)	10 July 1933
Aug	47.5 mm (1.9 in)	22 August 1940
Sep	65.3 mm (2.6 in)	17 September 1931
Oct	104.9 mm (4.1 in)	11 October 1964
Nov	129.5 mm (5.1 in)	6 November 1942
Dec	102.9 mm (4.1 in)	24 December 1969

Period of Record Coverage

1965 to 1985

21 years of record at Twin Hills Post Office, 1965 to 1985. 6 years have data for under 90 percent of days and are left out of rankings: 1965, 1974, 1975, 1976, 1977, 1985.

Days with data per year at Twin Hills Post Office
Year	Days with data	Share of year	Complete
1965	102	28%	No
1966	365	100%	Yes
1967	365	100%	Yes
1968	335	92%	Yes
1969	365	100%	Yes
1970	353	97%	Yes
1971	365	100%	Yes
1972	365	100%	Yes
1973	365	100%	Yes
1974	293	80%	No
1975	231	63%	No
1976	219	60%	No
1977	293	80%	No
1978	365	100%	Yes
1979	363	99%	Yes
1980	365	100%	Yes
1981	364	100%	Yes
1982	363	99%	Yes
1983	363	99%	Yes
1984	357	98%	Yes
1985	283	78%	No

Latest Records

Latest records at Twin Hills Post Office
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 May 1985	Twin Hills Post Office, AU	daily rain	31.8 mm (1.3 in)	9.4 mm (0.37 in)	78 years	37 of 100 (Notable)
10 May 1985	Twin Hills Post Office, AU	daily rain	6.6 mm (0.26 in)	4.6 mm (0.18 in)	23 years	17 of 100 (Routine)
8 May 1985	Twin Hills Post Office, AU	daily rain	32.2 mm (1.3 in)	0.4 mm (0.02 in)	55 years	25 of 100 (Routine)
25 February 1985	Twin Hills Post Office, AU	daily rain	57.4 mm (2.3 in)	14.7 mm (0.6 in)	55 years	32 of 100 (Routine)
7 December 1984	Twin Hills Post Office, AU	daily rain	43.2 mm (1.7 in)	21.6 mm (0.9 in)	64 years	41 of 100 (Notable)
13 September 1984	Twin Hills Post Office, AU	daily rain	14.8 mm (0.6 in)	2.1 mm (0.08 in)	11 years	13 of 100 (Routine)
26 July 1984	Twin Hills Post Office, AU	daily rain	18.0 mm (0.7 in)	2.0 mm (0.08 in)	75 years	20 of 100 (Routine)
25 July 1984	Twin Hills Post Office, AU	daily rain	22.4 mm (0.9 in)	1.8 mm (0.07 in)	27 years	18 of 100 (Routine)
13 July 1984	Twin Hills Post Office, AU	daily rain	4.2 mm (0.17 in)	2.9 mm (0.11 in)	69 years	20 of 100 (Routine)
21 January 1984	Twin Hills Post Office, AU	daily rain	69.8 mm (2.7 in)	15.2 mm (0.6 in)	58 years	34 of 100 (Routine)
11 November 1983	Twin Hills Post Office, AU	daily rain	41.8 mm (1.6 in)	25.5 mm (1.0 in)	44 years	36 of 100 (Notable)
2 May 1983	Twin Hills Post Office, AU	daily rain	55.2 mm (2.2 in)	8.2 mm (0.32 in)	37 years	23 of 100 (Routine)
30 April 1983	Twin Hills Post Office, AU	daily rain	51.2 mm (2.0 in)	20.7 mm (0.8 in)	14 years	19 of 100 (Routine)
28 April 1983	Twin Hills Post Office, AU	daily rain	39.2 mm (1.5 in)	22.4 mm (0.9 in)	28 years	23 of 100 (Routine)
20 March 1983	Twin Hills Post Office, AU	daily rain	21.6 mm (0.9 in)	3.3 mm (0.13 in)	40 years	20 of 100 (Routine)
15 December 1981	Twin Hills Post Office, AU	daily rain	50.6 mm (2.0 in)	13.3 mm (0.5 in)	56 years	33 of 100 (Routine)
29 November 1981	Twin Hills Post Office, AU	daily rain	34.0 mm (1.3 in)	14.4 mm (0.6 in)	2 years	16 of 100 (Routine)
20 November 1981	Twin Hills Post Office, AU	daily rain	60.2 mm (2.4 in)	8.1 mm (0.32 in)	54 years	28 of 100 (Routine)
22 July 1981	Twin Hills Post Office, AU	daily rain	27.8 mm (1.1 in)	13.1 mm (0.5 in)	76 years	38 of 100 (Notable)
21 May 1981	Twin Hills Post Office, AU	daily rain	73.0 mm (2.9 in)	63.3 mm (2.5 in)	75 years	67 of 100 (Major)

Climate Trend

12 complete years, 1966 to 1984

One stripe for each of 12 complete years at Twin Hills Post Office, 1966 to 1984. Blue stripes are years cooler than the station's own mean of 23.1 C (73.6 F); red stripes are warmer. The coolest year was 1966, at 22.6 C (72.7 F), and the warmest was 1969, at 23.9 C (75.0 F). The strongest colour marks a difference of 0.8 C (1.4 F).

Annual mean temperature at Twin Hills Post Office as warming stripes, 1966 to 1984
Year	Annual mean temperature	Difference from the station mean
1966	22.6 C	-0.53 C
1967	22.9 C	-0.20 C
1969	23.9 C	+0.76 C
1970	23.3 C	+0.14 C
1971	23.1 C	-0.07 C
1972	23.0 C	-0.12 C
1979	22.9 C	-0.18 C
1980	23.6 C	+0.46 C
1981	22.9 C	-0.23 C
1982	23.0 C	-0.13 C
1983	23.4 C	+0.31 C
1984	22.9 C	-0.21 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

1895 to 1985

Yearly extremes at Twin Hills Post Office: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	43.8 C (110.8 F)	1976	41.7 C (107.1 F)	21
Coldest night (TNn)	-3.2 C (26.2 F)	1984	-1.0 C (30.2 F)	21
Wettest day (Rx1day)	311.2 mm (12.3 in)	1958	66.7 mm (2.6 in)	86
Wettest five days (Rx5day)	359.2 mm (14.1 in)	1958	111.3 mm (4.4 in)	86
Longest dry spell (CDD)	245 days	1902	68 days	86

Hottest day (TXx)

The hottest day of the year at Twin Hills Post Office, 1895 to 1985. The record is 43.8 C (110.8 F) in 1976, marked on the chart; the median year is 41.7 C (107.1 F).

Hottest day (TXx) at Twin Hills Post Office by year
Year	Hottest day (TXx)
1895	n/a
1897	n/a
1898	n/a
1901	n/a
1902	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	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	43.3 C (109.9 F)
1966	40.6 C (105.1 F)
1967	42.8 C (109.0 F)
1968	41.3 C (106.3 F)
1969	43.4 C (110.1 F)
1970	40.7 C (105.3 F)
1971	41.7 C (107.1 F)
1972	42.5 C (108.5 F)
1973	42.7 C (108.9 F)
1974	40.4 C (104.7 F)
1975	41.2 C (106.2 F)
1976	43.8 C (110.8 F)
1977	42.5 C (108.5 F)
1978	40.0 C (104.0 F)
1979	43.5 C (110.3 F)
1980	41.3 C (106.3 F)
1981	41.0 C (105.8 F)
1982	42.2 C (108.0 F)
1983	42.4 C (108.3 F)
1984	41.2 C (106.2 F)
1985	41.6 C (106.9 F)

Coldest night (TNn)

The coldest night of the year at Twin Hills Post Office, 1895 to 1985. The record is -3.2 C (26.2 F) in 1984, marked on the chart; the median year is -1.0 C (30.2 F).

Coldest night (TNn) at Twin Hills Post Office by year
Year	Coldest night (TNn)
1895	n/a
1897	n/a
1898	n/a
1901	n/a
1902	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	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	8.9 C (48.0 F)
1966	-2.2 C (28.0 F)
1967	-0.6 C (30.9 F)
1968	-1.7 C (28.9 F)
1969	2.1 C (35.8 F)
1970	-1.8 C (28.8 F)
1971	0.0 C (32.0 F)
1972	-1.6 C (29.1 F)
1973	2.3 C (36.1 F)
1974	-1.5 C (29.3 F)
1975	-1.0 C (30.2 F)
1976	-1.5 C (29.3 F)
1977	-0.6 C (30.9 F)
1978	0.5 C (32.9 F)
1979	-2.0 C (28.4 F)
1980	0.6 C (33.1 F)
1981	-1.6 C (29.1 F)
1982	-2.0 C (28.4 F)
1983	-1.0 C (30.2 F)
1984	-3.2 C (26.2 F)
1985	-0.5 C (31.1 F)

Wettest day (Rx1day)

The wettest day of the year at Twin Hills Post Office, 1895 to 1985. The record is 311.2 mm (12.3 in) in 1958, marked on the chart; the median year is 66.7 mm (2.6 in).

Wettest day (Rx1day) at Twin Hills Post Office by year
Year	Wettest day (Rx1day)
1895	0.0 mm (0.00 in)
1897	0.0 mm (0.00 in)
1898	0.0 mm (0.00 in)
1901	0.0 mm (0.00 in)
1902	0.0 mm (0.00 in)
1905	20.3 mm (0.8 in)
1906	51.3 mm (2.0 in)
1907	59.7 mm (2.4 in)
1908	59.2 mm (2.3 in)
1909	57.7 mm (2.3 in)
1910	141.2 mm (5.6 in)
1911	50.8 mm (2.0 in)
1912	127.0 mm (5.0 in)
1913	55.1 mm (2.2 in)
1914	85.1 mm (3.4 in)
1915	46.0 mm (1.8 in)
1916	70.1 mm (2.8 in)
1917	61.0 mm (2.4 in)
1918	97.8 mm (3.9 in)
1919	49.0 mm (1.9 in)
1920	87.6 mm (3.4 in)
1921	50.8 mm (2.0 in)
1922	81.8 mm (3.2 in)
1923	82.8 mm (3.3 in)
1924	62.5 mm (2.5 in)
1925	60.7 mm (2.4 in)
1926	57.2 mm (2.3 in)
1927	52.1 mm (2.1 in)
1928	152.9 mm (6.0 in)
1929	51.1 mm (2.0 in)
1930	110.5 mm (4.4 in)
1931	65.3 mm (2.6 in)
1932	42.4 mm (1.7 in)
1933	85.9 mm (3.4 in)
1934	51.8 mm (2.0 in)
1935	55.1 mm (2.2 in)
1936	48.3 mm (1.9 in)
1937	91.4 mm (3.6 in)
1938	85.1 mm (3.4 in)
1939	60.5 mm (2.4 in)
1940	99.6 mm (3.9 in)
1941	83.8 mm (3.3 in)
1942	129.5 mm (5.1 in)
1943	53.6 mm (2.1 in)
1944	47.0 mm (1.9 in)
1945	68.1 mm (2.7 in)
1946	64.0 mm (2.5 in)
1947	123.4 mm (4.9 in)
1948	64.8 mm (2.6 in)
1949	52.8 mm (2.1 in)
1950	236.2 mm (9.3 in)
1951	74.9 mm (2.9 in)
1952	71.1 mm (2.8 in)
1953	91.7 mm (3.6 in)
1954	86.4 mm (3.4 in)
1955	89.4 mm (3.5 in)
1956	81.3 mm (3.2 in)
1957	131.3 mm (5.2 in)
1958	311.2 mm (12.3 in)
1959	78.5 mm (3.1 in)
1960	42.9 mm (1.7 in)
1961	105.2 mm (4.1 in)
1962	41.9 mm (1.6 in)
1963	94.7 mm (3.7 in)
1964	104.9 mm (4.1 in)
1965	78.0 mm (3.1 in)
1966	38.9 mm (1.5 in)
1967	62.2 mm (2.4 in)
1968	99.8 mm (3.9 in)
1969	102.9 mm (4.1 in)
1970	52.6 mm (2.1 in)
1971	85.3 mm (3.4 in)
1972	40.6 mm (1.6 in)
1973	75.2 mm (3.0 in)
1974	111.0 mm (4.4 in)
1975	48.0 mm (1.9 in)
1976	57.0 mm (2.2 in)
1977	77.2 mm (3.0 in)
1978	121.4 mm (4.8 in)
1979	107.4 mm (4.2 in)
1980	70.0 mm (2.8 in)
1981	73.0 mm (2.9 in)
1982	39.0 mm (1.5 in)
1983	64.0 mm (2.5 in)
1984	83.2 mm (3.3 in)
1985	57.4 mm (2.3 in)

Wettest five days (Rx5day)

The wettest five days of the year at Twin Hills Post Office, 1895 to 1985. The record is 359.2 mm (14.1 in) in 1958, marked on the chart; the median year is 111.3 mm (4.4 in).

Wettest five days (Rx5day) at Twin Hills Post Office by year
Year	Wettest five days (Rx5day)
1895	0.0 mm (0.00 in)
1897	0.0 mm (0.00 in)
1898	0.0 mm (0.00 in)
1901	0.0 mm (0.00 in)
1902	0.0 mm (0.00 in)
1905	28.7 mm (1.1 in)
1906	94.9 mm (3.7 in)
1907	115.5 mm (4.5 in)
1908	109.6 mm (4.3 in)
1909	90.1 mm (3.5 in)
1910	205.5 mm (8.1 in)
1911	182.7 mm (7.2 in)
1912	316.5 mm (12.5 in)
1913	116.3 mm (4.6 in)
1914	92.7 mm (3.6 in)
1915	85.1 mm (3.4 in)
1916	96.3 mm (3.8 in)
1917	130.9 mm (5.2 in)
1918	158.8 mm (6.3 in)
1919	86.7 mm (3.4 in)
1920	96.5 mm (3.8 in)
1921	80.1 mm (3.2 in)
1922	177.5 mm (7.0 in)
1923	82.8 mm (3.3 in)
1924	120.4 mm (4.7 in)
1925	97.0 mm (3.8 in)
1926	63.6 mm (2.5 in)
1927	80.0 mm (3.1 in)
1928	158.0 mm (6.2 in)
1929	107.0 mm (4.2 in)
1930	130.1 mm (5.1 in)
1931	88.4 mm (3.5 in)
1932	62.3 mm (2.5 in)
1933	132.3 mm (5.2 in)
1934	76.9 mm (3.0 in)
1935	77.7 mm (3.1 in)
1936	87.3 mm (3.4 in)
1937	180.8 mm (7.1 in)
1938	168.4 mm (6.6 in)
1939	100.1 mm (3.9 in)
1940	188.2 mm (7.4 in)
1941	146.0 mm (5.7 in)
1942	188.1 mm (7.4 in)
1943	79.7 mm (3.1 in)
1944	160.8 mm (6.3 in)
1945	99.9 mm (3.9 in)
1946	152.4 mm (6.0 in)
1947	163.7 mm (6.4 in)
1948	64.8 mm (2.6 in)
1949	69.4 mm (2.7 in)
1950	354.9 mm (14.0 in)
1951	171.0 mm (6.7 in)
1952	118.6 mm (4.7 in)
1953	138.3 mm (5.4 in)
1954	137.8 mm (5.4 in)
1955	158.5 mm (6.2 in)
1956	139.5 mm (5.5 in)
1957	174.0 mm (6.9 in)
1958	359.2 mm (14.1 in)
1959	96.8 mm (3.8 in)
1960	100.1 mm (3.9 in)
1961	105.2 mm (4.1 in)
1962	81.7 mm (3.2 in)
1963	192.8 mm (7.6 in)
1964	113.0 mm (4.4 in)
1965	123.4 mm (4.9 in)
1966	90.5 mm (3.6 in)
1967	79.2 mm (3.1 in)
1968	253.2 mm (10.0 in)
1969	175.0 mm (6.9 in)
1970	66.3 mm (2.6 in)
1971	103.3 mm (4.1 in)
1972	95.2 mm (3.7 in)
1973	97.6 mm (3.8 in)
1974	213.0 mm (8.4 in)
1975	103.0 mm (4.1 in)
1976	118.2 mm (4.7 in)
1977	153.6 mm (6.0 in)
1978	196.0 mm (7.7 in)
1979	279.4 mm (11.0 in)
1980	118.6 mm (4.7 in)
1981	113.6 mm (4.5 in)
1982	48.6 mm (1.9 in)
1983	166.0 mm (6.5 in)
1984	149.6 mm (5.9 in)
1985	62.6 mm (2.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Twin Hills Post Office, 1895 to 1985. The record is 245 days in 1902, marked on the chart; the median year is 68 days.

Longest dry spell (CDD) at Twin Hills Post Office by year
Year	Longest dry spell (CDD)
1895	30 days
1897	30 days
1898	31 days
1901	30 days
1902	245 days
1905	84 days
1906	75 days
1907	66 days
1908	45 days
1909	59 days
1910	57 days
1911	84 days
1912	55 days
1913	153 days
1914	104 days
1915	58 days
1916	47 days
1917	89 days
1918	101 days
1919	72 days
1920	43 days
1921	40 days
1922	114 days
1923	105 days
1924	77 days
1925	39 days
1926	61 days
1927	53 days
1928	100 days
1929	104 days
1930	52 days
1931	66 days
1932	97 days
1933	39 days
1934	77 days
1935	52 days
1936	99 days
1937	87 days
1938	35 days
1939	80 days
1940	55 days
1941	108 days
1942	40 days
1943	81 days
1944	98 days
1945	49 days
1946	125 days
1947	80 days
1948	77 days
1949	89 days
1950	47 days
1951	97 days
1952	46 days
1953	154 days
1954	43 days
1955	34 days
1956	27 days
1957	69 days
1958	108 days
1959	75 days
1960	74 days
1961	89 days
1962	57 days
1963	125 days
1964	43 days
1965	101 days
1966	67 days
1967	55 days
1968	52 days
1969	134 days
1970	140 days
1971	50 days
1972	133 days
1973	35 days
1974	59 days
1975	54 days
1976	111 days
1977	120 days
1978	47 days
1979	68 days
1980	56 days
1981	38 days
1982	73 days
1983	58 days
1984	86 days
1985	38 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

79 years, 1906 to 1984

A day with at least 70.1 mm (2.8 in) of rain is expected about once in 2 years. A day with at least 236.5 mm (9.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Twin Hills 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	70.1 mm (2.8 in)
5 years	99.6 mm (3.9 in)
10 years	124.1 mm (4.9 in)
25 years	162.0 mm (6.4 in)
50 years	196.3 mm (7.7 in)
100 years	236.5 mm (9.3 in)	Longer than the 79 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, 79 years of values from 1906 to 1984.

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: 311.2 mm (12.3 in) in 1958; 236.2 mm (9.3 in) in 1950; 152.9 mm (6.0 in) in 1928.

Download the Data

Data for Twin Hills Post Office standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Twin Hills 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).