Shannon Hec Weather Records (ASN00096021)

Record envelope, standing records and threshold days for Shannon Hec (ASN00096021), Australia, with 59 years of record.

Key Facts for Shannon Hec

Shannon Hec (ASN00096021) is a weather station in Australia at -42.05 latitude and 146.75 longitude, 939 m (3,081 ft) above sea level.
The station reports from 1927 to 1985, 59 years of record.
1,464 records set at Shannon Hec still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Shannon Hec set a daily record precipitation of 28.2 mm (1.1 in) on 26 December 1984.

About the Station

Location: Australia, -42.05 latitude, 146.75 longitude.
Elevation: 939 m (3,081 ft).
Period of record: 1927 to 1985, 59 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 Shannon Hec. 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 Shannon Hec, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	33.4 C (92.1 F)	-3.0 C (26.6 F)	n/a	n/a
Feb	30.7 C (87.3 F)	-3.8 C (25.2 F)	n/a	n/a
Mar	29.9 C (85.8 F)	-3.9 C (25.0 F)	n/a	n/a
Apr	23.3 C (73.9 F)	-7.0 C (19.4 F)	n/a	n/a
May	18.7 C (65.7 F)	-8.3 C (17.1 F)	n/a	n/a
Jun	15.6 C (60.1 F)	-13.0 C (8.6 F)	n/a	n/a
Jul	11.5 C (52.7 F)	-10.2 C (13.6 F)	n/a	n/a
Aug	16.0 C (60.8 F)	-11.0 C (12.2 F)	n/a	n/a
Sep	22.8 C (73.0 F)	-10.7 C (12.7 F)	n/a	n/a
Oct	24.0 C (75.2 F)	-8.5 C (16.7 F)	n/a	n/a
Nov	27.8 C (82.0 F)	-5.2 C (22.6 F)	n/a	n/a
Dec	29.7 C (85.5 F)	-3.4 C (25.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Shannon Hec still stand. 1980 holds the most, with 75.

Standing records at Shannon Hec by the year they were set
Year set	Standing records
1957	57
1958	57
1959	67
1960	55
1961	69
1962	56
1963	70
1964	55
1965	59
1966	59
1967	63
1968	63
1969	63
1970	34
1971	39
1972	56
1973	29
1974	28
1975	43
1976	29
1977	41
1978	47
1979	40
1980	75
1981	35
1982	66
1983	63
1984	42
1985	4

All-Time Record Progression

1 new records

1 all-time records were set at Shannon Hec between 22 April 1960 and 22 April 1960. Each dot is a new record.

Wettest Day of Each Month

Apr: 111.8 mm (4.4 in)

The wettest day on record for each calendar month at Shannon Hec. The most was 111.8 mm (4.4 in) on 22 April 1960.

Record daily precipitation for each month at Shannon Hec
Month	Record daily precipitation (mm)	Date
Jan	48.0 mm (1.9 in)	23 January 1951
Feb	86.4 mm (3.4 in)	19 February 1946
Mar	90.9 mm (3.6 in)	26 March 1946
Apr	111.8 mm (4.4 in)	22 April 1960
May	55.9 mm (2.2 in)	3 May 1973
Jun	37.8 mm (1.5 in)	27 June 1948
Jul	38.4 mm (1.5 in)	11 July 1937
Aug	45.2 mm (1.8 in)	17 August 1970
Sep	48.8 mm (1.9 in)	30 September 1959
Oct	37.6 mm (1.5 in)	12 October 1957
Nov	43.2 mm (1.7 in)	2 November 1953
Dec	54.8 mm (2.2 in)	8 December 1982

Period of Record Coverage

1957 to 1985

29 years of record at Shannon Hec, 1957 to 1985. 11 years have data for under 90 percent of days and are left out of rankings: 1970, 1972, 1973, 1974, 1975, 1976, 1977, 1978 and others.

Days with data per year at Shannon Hec
Year	Days with data	Share of year	Complete
1957	364	100%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	366	100%	Yes
1961	364	100%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	358	98%	Yes
1965	363	99%	Yes
1966	362	99%	Yes
1967	363	99%	Yes
1968	359	98%	Yes
1969	365	100%	Yes
1970	244	67%	No
1971	365	100%	Yes
1972	306	84%	No
1973	248	68%	No
1974	233	64%	No
1975	260	71%	No
1976	253	69%	No
1977	246	67%	No
1978	305	84%	No
1979	339	93%	Yes
1980	335	92%	Yes
1981	332	91%	Yes
1982	340	93%	Yes
1983	324	89%	No
1984	318	87%	No
1985	43	12%	No

Latest Records

Latest records at Shannon Hec
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
26 December 1984	Shannon Hec, AU	daily rain	28.2 mm (1.1 in)	10.4 mm (0.4 in)	47 years	33 of 100 (Routine)
20 December 1984	Shannon Hec, AU	daily rain	23.8 mm (0.9 in)	6.0 mm (0.24 in)	34 years	20 of 100 (Routine)
13 November 1984	Shannon Hec, AU	daily rain	21.6 mm (0.9 in)	8.9 mm (0.35 in)	26 years	20 of 100 (Routine)
12 November 1984	Shannon Hec, AU	daily rain	18.0 mm (0.7 in)	2.8 mm (0.11 in)	35 years	19 of 100 (Routine)
13 October 1984	Shannon Hec, AU	daily rain	24.2 mm (1.0 in)	5.7 mm (0.22 in)	52 years	20 of 100 (Routine)
27 March 1984	Shannon Hec, AU	daily rain	17.4 mm (0.7 in)	2.7 mm (0.11 in)	42 years	20 of 100 (Routine)
14 March 1984	Shannon Hec, AU	daily rain	18.6 mm (0.7 in)	1.6 mm (0.06 in)	3 years	7 of 100 (Routine)
6 September 1983	Shannon Hec, AU	daily rain	31.0 mm (1.2 in)	4.1 mm (0.16 in)	29 years	20 of 100 (Routine)
9 June 1983	Shannon Hec, AU	daily rain	26.0 mm (1.0 in)	8.2 mm (0.32 in)	53 years	35 of 100 (Notable)
26 April 1983	Shannon Hec, AU	daily rain	24.0 mm (0.9 in)	5.7 mm (0.22 in)	32 years	20 of 100 (Routine)
23 March 1983	Shannon Hec, AU	daily rain	46.2 mm (1.8 in)	27.9 mm (1.1 in)	48 years	56 of 100 (Notable)
9 December 1982	Shannon Hec, AU	daily rain	17.2 mm (0.7 in)	2.5 mm (0.10 in)	36 years	18 of 100 (Routine)
8 December 1982	Shannon Hec, AU	monthly rain	54.8 mm (2.2 in)	5.0 mm (0.20 in)	43 years	35 of 100 (Notable)
10 November 1982	Shannon Hec, AU	daily rain	19.4 mm (0.8 in)	7.0 mm (0.28 in)	17 years	20 of 100 (Routine)
4 September 1982	Shannon Hec, AU	daily rain	25.8 mm (1.0 in)	5.5 mm (0.22 in)	17 years	19 of 100 (Routine)
21 May 1982	Shannon Hec, AU	daily rain	17.2 mm (0.7 in)	4.0 mm (0.16 in)	43 years	20 of 100 (Routine)
7 May 1982	Shannon Hec, AU	daily rain	17.2 mm (0.7 in)	0.2 mm (0.01 in)	8 years	7 of 100 (Routine)
9 March 1982	Shannon Hec, AU	daily rain	15.6 mm (0.6 in)	3.9 mm (0.15 in)	32 years	19 of 100 (Routine)
3 October 1981	Shannon Hec, AU	daily rain	20.6 mm (0.8 in)	11.4 mm (0.4 in)	6 years	20 of 100 (Routine)
28 August 1981	Shannon Hec, AU	daily rain	24.2 mm (1.0 in)	6.9 mm (0.27 in)	12 years	19 of 100 (Routine)

Climate Trend

20 complete years, 1957 to 1984

One stripe for each of 20 complete years at Shannon Hec, 1957 to 1984. Blue stripes are years cooler than the station's own mean of 7.0 C (44.5 F); red stripes are warmer. The coolest year was 1964, at 6.3 C (43.3 F), and the warmest was 1961, at 7.8 C (46.1 F). The strongest colour marks a difference of 0.9 C (1.6 F).

Annual mean temperature at Shannon Hec as warming stripes, 1957 to 1984
Year	Annual mean temperature	Difference from the station mean
1957	6.6 C	-0.36 C
1958	6.4 C	-0.56 C
1959	7.4 C	+0.42 C
1960	7.0 C	+0.01 C
1961	7.8 C	+0.84 C
1962	6.7 C	-0.30 C
1963	6.9 C	-0.07 C
1964	6.3 C	-0.72 C
1965	6.9 C	-0.09 C
1966	6.9 C	-0.06 C
1967	6.7 C	-0.23 C
1968	6.5 C	-0.46 C
1969	6.9 C	-0.06 C
1971	7.1 C	+0.15 C
1979	7.1 C	+0.17 C
1980	7.4 C	+0.45 C
1981	7.6 C	+0.59 C
1982	7.5 C	+0.54 C
1983	6.9 C	-0.04 C
1984	6.7 C	-0.28 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

1927 to 1985

Yearly extremes at Shannon Hec: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	33.4 C (92.1 F)	1982	28.0 C (82.4 F)	29
Coldest night (TNn)	-13.0 C (8.6 F)	1983	-7.9 C (17.8 F)	29
Wettest day (Rx1day)	111.8 mm (4.4 in)	1960	38.4 mm (1.5 in)	59
Wettest five days (Rx5day)	231.4 mm (9.1 in)	1960	68.1 mm (2.7 in)	59
Longest dry spell (CDD)	47 days	1939	15 days	59

Hottest day (TXx)

The hottest day of the year at Shannon Hec, 1927 to 1985. The record is 33.4 C (92.1 F) in 1982, marked on the chart; the median year is 28.0 C (82.4 F).

Hottest day (TXx) at Shannon Hec by year
Year	Hottest day (TXx)
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	27.8 C (82.0 F)
1958	25.6 C (78.1 F)
1959	31.1 C (88.0 F)
1960	30.0 C (86.0 F)
1961	31.1 C (88.0 F)
1962	28.9 C (84.0 F)
1963	25.6 C (78.1 F)
1964	27.9 C (82.2 F)
1965	27.2 C (81.0 F)
1966	29.9 C (85.8 F)
1967	30.0 C (86.0 F)
1968	30.0 C (86.0 F)
1969	27.8 C (82.0 F)
1970	24.1 C (75.4 F)
1971	26.9 C (80.4 F)
1972	28.0 C (82.4 F)
1973	25.5 C (77.9 F)
1974	27.0 C (80.6 F)
1975	30.5 C (86.9 F)
1976	27.0 C (80.6 F)
1977	28.0 C (82.4 F)
1978	29.0 C (84.2 F)
1979	28.4 C (83.1 F)
1980	29.7 C (85.5 F)
1981	29.2 C (84.6 F)
1982	33.4 C (92.1 F)
1983	30.7 C (87.3 F)
1984	24.0 C (75.2 F)
1985	27.3 C (81.1 F)

Coldest night (TNn)

The coldest night of the year at Shannon Hec, 1927 to 1985. The record is -13.0 C (8.6 F) in 1983, marked on the chart; the median year is -7.9 C (17.8 F).

Coldest night (TNn) at Shannon Hec by year
Year	Coldest night (TNn)
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	-6.7 C (19.9 F)
1958	-8.3 C (17.1 F)
1959	-7.2 C (19.0 F)
1960	-9.4 C (15.1 F)
1961	-8.3 C (17.1 F)
1962	-7.2 C (19.0 F)
1963	-7.2 C (19.0 F)
1964	-7.8 C (18.0 F)
1965	-6.1 C (21.0 F)
1966	-7.5 C (18.5 F)
1967	-6.7 C (19.9 F)
1968	-7.8 C (18.0 F)
1969	-8.6 C (16.5 F)
1970	-8.9 C (16.0 F)
1971	-9.0 C (15.8 F)
1972	-10.0 C (14.0 F)
1973	-8.0 C (17.6 F)
1974	-11.0 C (12.2 F)
1975	-7.0 C (19.4 F)
1976	-10.0 C (14.0 F)
1977	-6.0 C (21.2 F)
1978	-10.0 C (14.0 F)
1979	-6.0 C (21.2 F)
1980	-6.5 C (20.3 F)
1981	-8.2 C (17.2 F)
1982	-10.2 C (13.6 F)
1983	-13.0 C (8.6 F)
1984	-7.9 C (17.8 F)
1985	-1.0 C (30.2 F)

Wettest day (Rx1day)

The wettest day of the year at Shannon Hec, 1927 to 1985. The record is 111.8 mm (4.4 in) in 1960, marked on the chart; the median year is 38.4 mm (1.5 in).

Wettest day (Rx1day) at Shannon Hec by year
Year	Wettest day (Rx1day)
1927	35.3 mm (1.4 in)
1928	30.5 mm (1.2 in)
1929	109.7 mm (4.3 in)
1930	38.1 mm (1.5 in)
1931	63.0 mm (2.5 in)
1932	33.3 mm (1.3 in)
1933	36.1 mm (1.4 in)
1934	43.2 mm (1.7 in)
1935	44.5 mm (1.8 in)
1936	21.8 mm (0.9 in)
1937	38.4 mm (1.5 in)
1938	69.9 mm (2.8 in)
1939	35.1 mm (1.4 in)
1940	22.9 mm (0.9 in)
1941	43.7 mm (1.7 in)
1942	29.7 mm (1.2 in)
1943	38.1 mm (1.5 in)
1944	38.6 mm (1.5 in)
1945	21.8 mm (0.9 in)
1946	90.9 mm (3.6 in)
1947	46.2 mm (1.8 in)
1948	50.3 mm (2.0 in)
1949	29.0 mm (1.1 in)
1950	32.0 mm (1.3 in)
1951	48.0 mm (1.9 in)
1952	34.3 mm (1.4 in)
1953	43.2 mm (1.7 in)
1954	46.7 mm (1.8 in)
1955	28.4 mm (1.1 in)
1956	67.6 mm (2.7 in)
1957	38.9 mm (1.5 in)
1958	41.1 mm (1.6 in)
1959	48.8 mm (1.9 in)
1960	111.8 mm (4.4 in)
1961	32.8 mm (1.3 in)
1962	31.5 mm (1.2 in)
1963	25.7 mm (1.0 in)
1964	54.4 mm (2.1 in)
1965	39.6 mm (1.6 in)
1966	34.8 mm (1.4 in)
1967	29.7 mm (1.2 in)
1968	22.9 mm (0.9 in)
1969	54.9 mm (2.2 in)
1970	63.8 mm (2.5 in)
1971	35.6 mm (1.4 in)
1972	40.6 mm (1.6 in)
1973	55.9 mm (2.2 in)
1974	27.0 mm (1.1 in)
1975	43.2 mm (1.7 in)
1976	29.2 mm (1.1 in)
1977	26.0 mm (1.0 in)
1978	51.0 mm (2.0 in)
1979	29.0 mm (1.1 in)
1980	32.8 mm (1.3 in)
1981	47.6 mm (1.9 in)
1982	54.8 mm (2.2 in)
1983	46.2 mm (1.8 in)
1984	31.0 mm (1.2 in)
1985	20.2 mm (0.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Shannon Hec, 1927 to 1985. The record is 231.4 mm (9.1 in) in 1960, marked on the chart; the median year is 68.1 mm (2.7 in).

Wettest five days (Rx5day) at Shannon Hec by year
Year	Wettest five days (Rx5day)
1927	63.1 mm (2.5 in)
1928	65.2 mm (2.6 in)
1929	176.0 mm (6.9 in)
1930	55.6 mm (2.2 in)
1931	83.0 mm (3.3 in)
1932	64.8 mm (2.6 in)
1933	49.6 mm (2.0 in)
1934	69.6 mm (2.7 in)
1935	100.4 mm (4.0 in)
1936	53.5 mm (2.1 in)
1937	71.0 mm (2.8 in)
1938	72.7 mm (2.9 in)
1939	91.5 mm (3.6 in)
1940	45.0 mm (1.8 in)
1941	68.1 mm (2.7 in)
1942	51.5 mm (2.0 in)
1943	62.8 mm (2.5 in)
1944	74.1 mm (2.9 in)
1945	33.6 mm (1.3 in)
1946	114.5 mm (4.5 in)
1947	120.6 mm (4.7 in)
1948	95.0 mm (3.7 in)
1949	37.7 mm (1.5 in)
1950	80.2 mm (3.2 in)
1951	50.3 mm (2.0 in)
1952	119.6 mm (4.7 in)
1953	91.7 mm (3.6 in)
1954	100.3 mm (3.9 in)
1955	55.6 mm (2.2 in)
1956	89.0 mm (3.5 in)
1957	73.9 mm (2.9 in)
1958	75.7 mm (3.0 in)
1959	95.6 mm (3.8 in)
1960	231.4 mm (9.1 in)
1961	67.3 mm (2.6 in)
1962	55.1 mm (2.2 in)
1963	52.8 mm (2.1 in)
1964	103.1 mm (4.1 in)
1965	105.2 mm (4.1 in)
1966	59.7 mm (2.4 in)
1967	79.0 mm (3.1 in)
1968	68.1 mm (2.7 in)
1969	121.7 mm (4.8 in)
1970	108.9 mm (4.3 in)
1971	95.6 mm (3.8 in)
1972	41.7 mm (1.6 in)
1973	89.7 mm (3.5 in)
1974	39.8 mm (1.6 in)
1975	69.2 mm (2.7 in)
1976	50.4 mm (2.0 in)
1977	33.2 mm (1.3 in)
1978	68.0 mm (2.7 in)
1979	42.0 mm (1.7 in)
1980	67.4 mm (2.7 in)
1981	59.6 mm (2.3 in)
1982	74.2 mm (2.9 in)
1983	60.6 mm (2.4 in)
1984	64.0 mm (2.5 in)
1985	24.6 mm (1.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Shannon Hec, 1927 to 1985. The record is 47 days in 1939, marked on the chart; the median year is 15 days.

Longest dry spell (CDD) at Shannon Hec by year
Year	Longest dry spell (CDD)
1927	14 days
1928	24 days
1929	14 days
1930	20 days
1931	15 days
1932	20 days
1933	18 days
1934	20 days
1935	20 days
1936	30 days
1937	22 days
1938	13 days
1939	47 days
1940	23 days
1941	14 days
1942	12 days
1943	16 days
1944	10 days
1945	18 days
1946	10 days
1947	11 days
1948	12 days
1949	14 days
1950	16 days
1951	12 days
1952	12 days
1953	24 days
1954	18 days
1955	12 days
1956	13 days
1957	17 days
1958	15 days
1959	17 days
1960	15 days
1961	20 days
1962	23 days
1963	18 days
1964	12 days
1965	21 days
1966	12 days
1967	21 days
1968	17 days
1969	11 days
1970	23 days
1971	16 days
1972	14 days
1973	11 days
1974	22 days
1975	15 days
1976	20 days
1977	11 days
1978	10 days
1979	14 days
1980	11 days
1981	13 days
1982	12 days
1983	20 days
1984	18 days
1985	14 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.

Frost Dates and Growing Season

20 years with a frost

Across 20 years with a frost, the median last spring frost at Shannon Hec falls on 17 December and the median first autumn frost on 13 January, which leaves a median of 43 days between them.

Frost dates and growing season at Shannon Hec
Measure	Median, all years	Earliest period	Recent period (1957 to 1984)	Recent against earliest	Fitted trend
Last spring frost	17 December	n/a	17 December	n/a	n/a
First autumn frost	13 January	n/a	13 January	n/a	n/a
Growing days	43 days	n/a	43 days	n/a	n/a

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

50 years, 1928 to 1983

A day with at least 39.0 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 121.0 mm (4.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Shannon Hec: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	39.0 mm (1.5 in)
5 years	54.1 mm (2.1 in)
10 years	66.4 mm (2.6 in)
25 years	85.1 mm (3.4 in)
50 years	101.8 mm (4.0 in)
100 years	121.0 mm (4.8 in)	Longer than the 50 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, 50 years of values from 1928 to 1983.

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: 111.8 mm (4.4 in) in 1960; 109.7 mm (4.3 in) in 1929; 90.9 mm (3.6 in) in 1946.

Download the Data

Data for Shannon Hec standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Shannon Hec 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).