St Helens Post Office Weather Records (ASN00092033)

Record envelope, standing records and threshold days for St Helens Post Office (ASN00092033), Australia, with 115 years of record.

Key Facts for St Helens Post Office

St Helens Post Office (ASN00092033) is a weather station in Australia at -41.32 latitude and 148.25 longitude, 5 m (16 ft) above sea level.
The station reports from 1890 to 2004, 115 years of record.
1,464 records set at St Helens Post Office still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
St Helens Post Office set a daily record precipitation of 40.8 mm (1.6 in) on 8 April 2003.

About the Station

Location: Australia, -41.32 latitude, 148.25 longitude.
Elevation: 5 m (16 ft).
Period of record: 1890 to 2004, 115 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 St Helens 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 St Helens Post Office, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	39.2 C (102.6 F)	1.1 C (34.0 F)	n/a	n/a
Feb	39.8 C (103.6 F)	1.2 C (34.2 F)	n/a	n/a
Mar	36.7 C (98.1 F)	-0.2 C (31.6 F)	n/a	n/a
Apr	28.9 C (84.0 F)	-1.7 C (28.9 F)	n/a	n/a
May	25.7 C (78.3 F)	-2.9 C (26.8 F)	n/a	n/a
Jun	21.6 C (70.9 F)	-4.2 C (24.4 F)	n/a	n/a
Jul	21.6 C (70.9 F)	-4.3 C (24.3 F)	n/a	n/a
Aug	22.4 C (72.3 F)	-3.7 C (25.3 F)	n/a	n/a
Sep	28.4 C (83.1 F)	-2.3 C (27.9 F)	n/a	n/a
Oct	31.8 C (89.2 F)	-2.1 C (28.2 F)	n/a	n/a
Nov	35.6 C (96.1 F)	0.6 C (33.1 F)	n/a	n/a
Dec	37.8 C (100.0 F)	-0.6 C (30.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at St Helens Post Office still stand. 1958 holds the most, with 53.

Standing records at St Helens Post Office by the year they were set
Year set	Standing records
1957	43
1958	53
1959	40
1960	32
1961	29
1962	30
1963	52
1964	32
1965	42
1966	53
1967	27
1968	27
1969	38
1970	38
1971	27
1972	33
1973	20
1974	22
1975	28
1976	41
1977	32
1978	35
1979	24
1980	37
1981	31
1982	40
1983	29
1984	30
1985	33
1986	23
1987	33
1988	40
1989	15
1990	33
1991	33
1992	29
1993	23
1994	40
1995	36
1996	27
1997	24
1998	31
1999	37
2000	36
2001	6

All-Time Record Progression

6 new records

6 all-time records were set at St Helens Post Office between 3 March 1931 and 6 January 1997. Each dot is a new record.

When St Helens Post Office set new all-time records
Date	Kind	Detail
1931-03-03	Record daily precipitation	Record daily precipitation 149.9 mm (5.9 in)
1936-02-02	Record daily precipitation	Record daily precipitation 157.5 mm (6.2 in)
1946-02-19	Record daily precipitation	Record daily precipitation 157.7 mm (6.2 in)
1960-04-22	Record daily precipitation	Record daily precipitation 160.5 mm (6.3 in)
1993-12-23	Record daily precipitation	Record daily precipitation 190.4 mm (7.5 in)
1997-01-06	Record high minimum temperature	Record high minimum temperature 21.2 C (70.2 F)

Wettest Day of Each Month

Dec: 190.4 mm (7.5 in)

The wettest day on record for each calendar month at St Helens Post Office. The most was 190.4 mm (7.5 in) on 23 December 1993.

Record daily precipitation for each month at St Helens Post Office
Month	Record daily precipitation (mm)	Date
Jan	108.0 mm (4.3 in)	25 January 1991
Feb	157.7 mm (6.2 in)	19 February 1946
Mar	149.9 mm (5.9 in)	3 March 1931
Apr	160.5 mm (6.3 in)	22 April 1960
May	109.0 mm (4.3 in)	18 May 1986
Jun	121.9 mm (4.8 in)	5 June 1923
Jul	65.0 mm (2.6 in)	23 July 1989
Aug	117.1 mm (4.6 in)	16 August 1958
Sep	102.1 mm (4.0 in)	20 September 1959
Oct	78.2 mm (3.1 in)	3 October 1928
Nov	73.8 mm (2.9 in)	14 November 1998
Dec	190.4 mm (7.5 in)	23 December 1993

Period of Record Coverage

1957 to 2001

45 years of record at St Helens Post Office, 1957 to 2001. 14 years have data for under 90 percent of days and are left out of rankings: 1972, 1973, 1975, 1976, 1977, 1978, 1987, 1988 and others.

Days with data per year at St Helens Post Office
Year	Days with data	Share of year	Complete
1957	363	99%	Yes
1958	364	100%	Yes
1959	360	99%	Yes
1960	366	100%	Yes
1961	365	100%	Yes
1962	364	100%	Yes
1963	362	99%	Yes
1964	366	100%	Yes
1965	363	99%	Yes
1966	364	100%	Yes
1967	364	100%	Yes
1968	330	90%	Yes
1969	344	94%	Yes
1970	352	96%	Yes
1971	330	90%	Yes
1972	323	88%	No
1973	306	84%	No
1974	334	92%	Yes
1975	316	87%	No
1976	320	87%	No
1977	327	90%	No
1978	322	88%	No
1979	332	91%	Yes
1980	347	95%	Yes
1981	350	96%	Yes
1982	357	98%	Yes
1983	362	99%	Yes
1984	354	97%	Yes
1985	363	99%	Yes
1986	338	93%	Yes
1987	315	86%	No
1988	296	81%	No
1989	283	78%	No
1990	340	93%	Yes
1991	346	95%	Yes
1992	350	96%	Yes
1993	348	95%	Yes
1994	349	96%	Yes
1995	332	91%	Yes
1996	330	90%	Yes
1997	321	88%	No
1998	320	88%	No
1999	308	84%	No
2000	269	73%	No
2001	80	22%	No

Latest Records

Latest records at St Helens Post Office
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
8 April 2003	St Helens Post Office, AU	daily rain	40.8 mm (1.6 in)	17.9 mm (0.7 in)	41 years	39 of 100 (Notable)
20 March 2003	St Helens Post Office, AU	daily rain	48.8 mm (1.9 in)	3.6 mm (0.14 in)	32 years	21 of 100 (Routine)
10 March 2003	St Helens Post Office, AU	daily rain	59.4 mm (2.3 in)	21.3 mm (0.8 in)	70 years	47 of 100 (Notable)
24 November 2001	St Helens Post Office, AU	daily rain	41.2 mm (1.6 in)	31.0 mm (1.2 in)	52 years	61 of 100 (Major)
4 October 2001	St Helens Post Office, AU	daily rain	38.6 mm (1.5 in)	12.4 mm (0.5 in)	24 years	31 of 100 (Routine)
28 August 2001	St Helens Post Office, AU	daily rain	32.4 mm (1.3 in)	8.8 mm (0.35 in)	104 years	50 of 100 (Notable)
24 April 2001	St Helens Post Office, AU	daily rain	45.2 mm (1.8 in)	8.6 mm (0.34 in)	55 years	34 of 100 (Routine)
1 March 2001	St Helens Post Office, AU	daily low min	4.6 C (40.3 F)	0.6 C (1.1 F)	34 years	15 of 100 (Routine)
21 February 2001	St Helens Post Office, AU	daily high max	33.9 C (93.0 F)	5.0 C (9.0 F)	34 years	27 of 100 (Routine)
8 February 2001	St Helens Post Office, AU	daily high max	36.2 C (97.2 F)	3.0 C (5.4 F)	18 years	16 of 100 (Routine)
4 February 2001	St Helens Post Office, AU	daily high max	36.2 C (97.2 F)	0.6 C (1.1 F)	34 years	15 of 100 (Routine)
3 January 2001	St Helens Post Office, AU	daily high min	19.8 C (67.6 F)	1.8 C (3.2 F)	17 years	14 of 100 (Routine)
2 January 2001	St Helens Post Office, AU	daily high max	33.2 C (91.8 F)	0.1 C (0.2 F)	28 years	12 of 100 (Routine)
28 December 2000	St Helens Post Office, AU	daily low min	2.8 C (37.0 F)	1.2 C (2.2 F)	23 years	13 of 100 (Routine)
22 December 2000	St Helens Post Office, AU	daily high min	19.8 C (67.6 F)	4.7 C (8.5 F)	29 years	26 of 100 (Routine)
17 November 2000	St Helens Post Office, AU	daily high min	15.0 C (59.0 F)	0.6 C (1.1 F)	36 years	15 of 100 (Routine)
10 November 2000	St Helens Post Office, AU	daily high min	16.8 C (62.2 F)	2.3 C (4.1 F)	16 years	14 of 100 (Routine)
3 November 2000	St Helens Post Office, AU	daily high min	15.0 C (59.0 F)	1.3 C (2.3 F)	6 years	8 of 100 (Routine)
25 October 2000	St Helens Post Office, AU	daily low max	12.4 C (54.3 F)	1.6 C (2.9 F)	15 years	12 of 100 (Routine)
24 October 2000	St Helens Post Office, AU	daily high min	13.6 C (56.5 F)	0.1 C (0.2 F)	22 years	10 of 100 (Routine)

Climate Trend

36 complete years, 1957 to 1999

One stripe for each of 36 complete years at St Helens Post Office, 1957 to 1999. Blue stripes are years cooler than the station's own mean of 12.9 C (55.3 F); red stripes are warmer. The coolest year was 1964, at 12.1 C (53.7 F), and the warmest was 1999, at 13.9 C (57.0 F). The strongest colour marks a difference of 1.0 C (1.8 F).

Annual mean temperature at St Helens Post Office as warming stripes, 1957 to 1999
Year	Annual mean temperature	Difference from the station mean
1957	12.3 C	-0.59 C
1959	12.9 C	-0.03 C
1960	12.5 C	-0.45 C
1961	13.1 C	+0.19 C
1962	12.6 C	-0.36 C
1963	12.4 C	-0.52 C
1964	12.1 C	-0.86 C
1965	12.3 C	-0.60 C
1966	12.2 C	-0.71 C
1967	12.8 C	-0.15 C
1969	13.0 C	+0.11 C
1970	12.9 C	0.00 C
1971	13.0 C	+0.08 C
1972	13.2 C	+0.28 C
1973	12.5 C	-0.40 C
1974	13.2 C	+0.23 C
1977	13.1 C	+0.19 C
1978	13.0 C	+0.04 C
1979	13.1 C	+0.17 C
1980	13.5 C	+0.58 C
1981	13.6 C	+0.70 C
1982	13.3 C	+0.41 C
1983	13.0 C	+0.08 C
1984	12.9 C	0.00 C
1985	12.9 C	-0.06 C
1986	12.8 C	-0.13 C
1987	13.1 C	+0.18 C
1990	13.5 C	+0.58 C
1991	13.2 C	+0.29 C
1992	12.7 C	-0.22 C
1993	13.5 C	+0.52 C
1994	12.8 C	-0.13 C
1995	12.5 C	-0.42 C
1996	12.6 C	-0.34 C
1997	13.5 C	+0.58 C
1999	13.9 C	+0.94 C

The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1957 to 1999. In Fahrenheit: 0.3 F (0.1 to 0.5) per decade. The slope is a straight line fitted to 36 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at St Helens Post Office
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.2 C (0.1 to 0.3) per decade	0.3 F (0.1 to 0.5) per decade	1957 to 1999	36	Rise
Mean daily maximum	0.3 C (0.1 to 0.4) per decade	0.5 F (0.3 to 0.8) per decade	1957 to 1999	36	Rise
Mean daily minimum	0.1 C (-0.1 to 0.2) per decade	0.1 F (-0.1 to 0.3) per decade	1957 to 1999	36	Not clearly different from zero

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

1890 to 2004

Yearly extremes at St Helens Post Office: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	39.8 C (103.6 F)	1983	34.9 C (94.8 F)	45
Coldest night (TNn)	-4.3 C (24.3 F)	1968	-2.8 C (27.0 F)	45
Wettest day (Rx1day)	190.4 mm (7.5 in)	1993	62.0 mm (2.4 in)	109
Wettest five days (Rx5day)	295.7 mm (11.6 in)	1911	94.4 mm (3.7 in)	108
Longest dry spell (CDD)	49 days	1967	21 days	109

Hottest day (TXx)

The hottest day of the year at St Helens Post Office, 1890 to 2004. The record is 39.8 C (103.6 F) in 1983, marked on the chart; the median year is 34.9 C (94.8 F).

Hottest day (TXx) at St Helens Post Office by year
Year	Hottest day (TXx)
1890	n/a
1891	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
1904	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	33.9 C (93.0 F)
1958	33.9 C (93.0 F)
1959	37.8 C (100.0 F)
1960	37.8 C (100.0 F)
1961	32.8 C (91.0 F)
1962	35.3 C (95.5 F)
1963	32.1 C (89.8 F)
1964	33.7 C (92.7 F)
1965	33.7 C (92.7 F)
1966	36.7 C (98.1 F)
1967	36.7 C (98.1 F)
1968	38.8 C (101.8 F)
1969	34.4 C (93.9 F)
1970	32.8 C (91.0 F)
1971	31.7 C (89.1 F)
1972	34.0 C (93.2 F)
1973	33.1 C (91.6 F)
1974	30.5 C (86.9 F)
1975	35.0 C (95.0 F)
1976	33.0 C (91.4 F)
1977	34.0 C (93.2 F)
1978	35.4 C (95.7 F)
1979	35.5 C (95.9 F)
1980	34.0 C (93.2 F)
1981	35.2 C (95.4 F)
1982	38.0 C (100.4 F)
1983	39.8 C (103.6 F)
1984	32.0 C (89.6 F)
1985	35.0 C (95.0 F)
1986	34.0 C (93.2 F)
1987	33.1 C (91.6 F)
1988	35.9 C (96.6 F)
1989	31.8 C (89.2 F)
1990	34.9 C (94.8 F)
1991	39.2 C (102.6 F)
1992	32.4 C (90.3 F)
1993	37.2 C (99.0 F)
1994	35.7 C (96.3 F)
1995	35.9 C (96.6 F)
1996	30.0 C (86.0 F)
1997	37.8 C (100.0 F)
1998	37.8 C (100.0 F)
1999	34.0 C (93.2 F)
2000	35.7 C (96.3 F)
2001	36.2 C (97.2 F)
2002	n/a
2003	n/a
2004	n/a

Coldest night (TNn)

The coldest night of the year at St Helens Post Office, 1890 to 2004. The record is -4.3 C (24.3 F) in 1968, marked on the chart; the median year is -2.8 C (27.0 F).

Coldest night (TNn) at St Helens Post Office by year
Year	Coldest night (TNn)
1890	n/a
1891	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
1904	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	-2.2 C (28.0 F)
1958	-3.3 C (26.1 F)
1959	-3.3 C (26.1 F)
1960	-2.8 C (27.0 F)
1961	-3.3 C (26.1 F)
1962	-2.8 C (27.0 F)
1963	-2.9 C (26.8 F)
1964	-3.3 C (26.1 F)
1965	-2.7 C (27.1 F)
1966	-3.1 C (26.4 F)
1967	-2.8 C (27.0 F)
1968	-4.3 C (24.3 F)
1969	-3.1 C (26.4 F)
1970	-3.3 C (26.1 F)
1971	-1.7 C (28.9 F)
1972	-2.1 C (28.2 F)
1973	-2.0 C (28.4 F)
1974	0.0 C (32.0 F)
1975	-1.1 C (30.0 F)
1976	-3.0 C (26.6 F)
1977	-2.3 C (27.9 F)
1978	-3.0 C (26.6 F)
1979	-3.0 C (26.6 F)
1980	-1.7 C (28.9 F)
1981	-2.7 C (27.1 F)
1982	-3.2 C (26.2 F)
1983	-4.0 C (24.8 F)
1984	-2.0 C (28.4 F)
1985	-2.5 C (27.5 F)
1986	-3.0 C (26.6 F)
1987	-2.0 C (28.4 F)
1988	0.0 C (32.0 F)
1989	-1.0 C (30.2 F)
1990	-4.0 C (24.8 F)
1991	-4.1 C (24.6 F)
1992	-3.1 C (26.4 F)
1993	-3.1 C (26.4 F)
1994	-4.2 C (24.4 F)
1995	-4.2 C (24.4 F)
1996	-2.0 C (28.4 F)
1997	-3.7 C (25.3 F)
1998	-2.8 C (27.0 F)
1999	-2.4 C (27.7 F)
2000	-2.8 C (27.0 F)
2001	1.4 C (34.5 F)
2002	n/a
2003	n/a
2004	n/a

Wettest day (Rx1day)

The wettest day of the year at St Helens Post Office, 1890 to 2004. The record is 190.4 mm (7.5 in) in 1993, marked on the chart; the median year is 62.0 mm (2.4 in).

Wettest day (Rx1day) at St Helens Post Office by year
Year	Wettest day (Rx1day)
1890	57.2 mm (2.3 in)
1891	56.1 mm (2.2 in)
1893	85.9 mm (3.4 in)
1894	0.0 mm (0.00 in)
1895	0.0 mm (0.00 in)
1896	44.5 mm (1.8 in)
1897	34.0 mm (1.3 in)
1898	76.5 mm (3.0 in)
1899	32.8 mm (1.3 in)
1900	24.4 mm (1.0 in)
1904	116.1 mm (4.6 in)
1907	124.7 mm (4.9 in)
1908	44.7 mm (1.8 in)
1909	68.6 mm (2.7 in)
1910	61.2 mm (2.4 in)
1911	134.1 mm (5.3 in)
1912	74.9 mm (2.9 in)
1913	39.9 mm (1.6 in)
1914	77.2 mm (3.0 in)
1915	41.4 mm (1.6 in)
1916	46.5 mm (1.8 in)
1917	80.5 mm (3.2 in)
1918	55.9 mm (2.2 in)
1919	78.7 mm (3.1 in)
1920	40.6 mm (1.6 in)
1921	74.9 mm (2.9 in)
1922	39.4 mm (1.6 in)
1923	121.9 mm (4.8 in)
1924	103.6 mm (4.1 in)
1925	86.4 mm (3.4 in)
1926	78.0 mm (3.1 in)
1927	74.9 mm (2.9 in)
1928	78.2 mm (3.1 in)
1929	96.5 mm (3.8 in)
1930	68.6 mm (2.7 in)
1931	149.9 mm (5.9 in)
1932	47.2 mm (1.9 in)
1933	58.4 mm (2.3 in)
1934	88.9 mm (3.5 in)
1935	59.4 mm (2.3 in)
1936	157.5 mm (6.2 in)
1937	78.7 mm (3.1 in)
1938	54.4 mm (2.1 in)
1939	52.1 mm (2.1 in)
1940	51.3 mm (2.0 in)
1941	53.3 mm (2.1 in)
1942	76.2 mm (3.0 in)
1943	59.7 mm (2.4 in)
1944	54.6 mm (2.1 in)
1945	73.7 mm (2.9 in)
1946	157.7 mm (6.2 in)
1947	64.8 mm (2.6 in)
1948	65.0 mm (2.6 in)
1949	52.8 mm (2.1 in)
1950	59.4 mm (2.3 in)
1951	47.0 mm (1.9 in)
1952	78.5 mm (3.1 in)
1953	47.2 mm (1.9 in)
1954	94.7 mm (3.7 in)
1955	85.1 mm (3.4 in)
1956	101.6 mm (4.0 in)
1957	46.0 mm (1.8 in)
1958	117.1 mm (4.6 in)
1959	131.1 mm (5.2 in)
1960	160.5 mm (6.3 in)
1961	47.2 mm (1.9 in)
1962	46.7 mm (1.8 in)
1963	33.5 mm (1.3 in)
1964	94.5 mm (3.7 in)
1965	111.5 mm (4.4 in)
1966	45.7 mm (1.8 in)
1967	31.0 mm (1.2 in)
1968	28.2 mm (1.1 in)
1969	62.0 mm (2.4 in)
1970	118.9 mm (4.7 in)
1971	101.6 mm (4.0 in)
1972	55.9 mm (2.2 in)
1973	35.1 mm (1.4 in)
1974	52.0 mm (2.0 in)
1975	48.6 mm (1.9 in)
1976	69.6 mm (2.7 in)
1977	65.6 mm (2.6 in)
1978	54.0 mm (2.1 in)
1979	28.4 mm (1.1 in)
1980	66.0 mm (2.6 in)
1981	63.8 mm (2.5 in)
1982	108.0 mm (4.3 in)
1983	61.2 mm (2.4 in)
1984	60.0 mm (2.4 in)
1985	56.0 mm (2.2 in)
1986	109.0 mm (4.3 in)
1987	43.0 mm (1.7 in)
1988	54.2 mm (2.1 in)
1989	65.0 mm (2.6 in)
1990	34.0 mm (1.3 in)
1991	108.0 mm (4.3 in)
1992	82.2 mm (3.2 in)
1993	190.4 mm (7.5 in)
1994	42.6 mm (1.7 in)
1995	62.8 mm (2.5 in)
1996	83.6 mm (3.3 in)
1997	47.0 mm (1.9 in)
1998	73.8 mm (2.9 in)
1999	54.8 mm (2.2 in)
2000	72.2 mm (2.8 in)
2001	64.6 mm (2.5 in)
2002	0.0 mm (0.00 in)
2003	59.4 mm (2.3 in)
2004	23.4 mm (0.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at St Helens Post Office, 1890 to 2004. The record is 295.7 mm (11.6 in) in 1911, marked on the chart; the median year is 94.4 mm (3.7 in).

Wettest five days (Rx5day) at St Helens Post Office by year
Year	Wettest five days (Rx5day)
1890	103.9 mm (4.1 in)
1891	56.1 mm (2.2 in)
1893	170.7 mm (6.7 in)
1894	0.0 mm (0.00 in)
1895	0.0 mm (0.00 in)
1896	114.6 mm (4.5 in)
1897	36.0 mm (1.4 in)
1898	96.8 mm (3.8 in)
1899	59.5 mm (2.3 in)
1900	44.5 mm (1.8 in)
1904	124.5 mm (4.9 in)
1907	143.8 mm (5.7 in)
1908	52.0 mm (2.0 in)
1909	87.0 mm (3.4 in)
1910	88.6 mm (3.5 in)
1911	295.7 mm (11.6 in)
1912	85.5 mm (3.4 in)
1913	69.6 mm (2.7 in)
1914	120.9 mm (4.8 in)
1915	105.4 mm (4.1 in)
1916	108.0 mm (4.3 in)
1917	93.5 mm (3.7 in)
1918	78.0 mm (3.1 in)
1919	124.7 mm (4.9 in)
1920	71.8 mm (2.8 in)
1921	102.3 mm (4.0 in)
1922	97.5 mm (3.8 in)
1923	148.4 mm (5.8 in)
1924	174.2 mm (6.9 in)
1925	134.9 mm (5.3 in)
1926	114.1 mm (4.5 in)
1927	86.1 mm (3.4 in)
1928	106.9 mm (4.2 in)
1929	196.8 mm (7.7 in)
1930	86.2 mm (3.4 in)
1931	201.2 mm (7.9 in)
1932	93.2 mm (3.7 in)
1933	90.6 mm (3.6 in)
1934	109.3 mm (4.3 in)
1935	116.1 mm (4.6 in)
1936	159.0 mm (6.3 in)
1937	87.8 mm (3.5 in)
1938	101.6 mm (4.0 in)
1939	118.6 mm (4.7 in)
1940	77.7 mm (3.1 in)
1941	73.6 mm (2.9 in)
1942	82.1 mm (3.2 in)
1943	86.1 mm (3.4 in)
1944	83.7 mm (3.3 in)
1945	129.6 mm (5.1 in)
1946	158.5 mm (6.2 in)
1947	77.3 mm (3.0 in)
1948	91.7 mm (3.6 in)
1949	68.8 mm (2.7 in)
1950	84.5 mm (3.3 in)
1951	64.8 mm (2.6 in)
1952	89.2 mm (3.5 in)
1953	92.7 mm (3.6 in)
1954	138.4 mm (5.4 in)
1955	95.2 mm (3.7 in)
1956	125.3 mm (4.9 in)
1957	70.6 mm (2.8 in)
1958	129.3 mm (5.1 in)
1959	206.3 mm (8.1 in)
1960	179.1 mm (7.1 in)
1961	102.5 mm (4.0 in)
1962	73.1 mm (2.9 in)
1963	54.4 mm (2.1 in)
1964	99.1 mm (3.9 in)
1965	126.7 mm (5.0 in)
1966	63.5 mm (2.5 in)
1967	97.6 mm (3.8 in)
1968	33.0 mm (1.3 in)
1969	98.3 mm (3.9 in)
1970	195.6 mm (7.7 in)
1971	162.1 mm (6.4 in)
1972	65.3 mm (2.6 in)
1973	66.9 mm (2.6 in)
1974	107.2 mm (4.2 in)
1975	65.8 mm (2.6 in)
1976	83.6 mm (3.3 in)
1977	110.5 mm (4.4 in)
1978	68.6 mm (2.7 in)
1979	58.0 mm (2.3 in)
1980	87.2 mm (3.4 in)
1981	106.4 mm (4.2 in)
1982	195.0 mm (7.7 in)
1983	87.2 mm (3.4 in)
1984	106.2 mm (4.2 in)
1985	129.8 mm (5.1 in)
1986	149.2 mm (5.9 in)
1987	58.6 mm (2.3 in)
1988	99.2 mm (3.9 in)
1989	124.5 mm (4.9 in)
1990	55.6 mm (2.2 in)
1991	142.8 mm (5.6 in)
1992	143.2 mm (5.6 in)
1993	271.6 mm (10.7 in)
1994	85.8 mm (3.4 in)
1995	76.6 mm (3.0 in)
1996	87.2 mm (3.4 in)
1997	77.8 mm (3.1 in)
1998	107.6 mm (4.2 in)
1999	63.8 mm (2.5 in)
2000	93.2 mm (3.7 in)
2001	75.4 mm (3.0 in)
2002	n/a
2003	112.2 mm (4.4 in)
2004	39.8 mm (1.6 in)

Longest dry spell (CDD)

The longest dry spell of the year at St Helens Post Office, 1890 to 2004. The record is 49 days in 1967, marked on the chart; the median year is 21 days.

Longest dry spell (CDD) at St Helens Post Office by year
Year	Longest dry spell (CDD)
1890	14 days
1891	33 days
1893	23 days
1894	30 days
1895	30 days
1896	41 days
1897	21 days
1898	26 days
1899	28 days
1900	22 days
1904	30 days
1907	19 days
1908	18 days
1909	28 days
1910	24 days
1911	31 days
1912	21 days
1913	23 days
1914	29 days
1915	28 days
1916	15 days
1917	18 days
1918	27 days
1919	31 days
1920	21 days
1921	14 days
1922	18 days
1923	28 days
1924	16 days
1925	18 days
1926	17 days
1927	25 days
1928	19 days
1929	25 days
1930	19 days
1931	22 days
1932	37 days
1933	19 days
1934	19 days
1935	22 days
1936	15 days
1937	20 days
1938	21 days
1939	25 days
1940	19 days
1941	27 days
1942	16 days
1943	14 days
1944	16 days
1945	24 days
1946	14 days
1947	20 days
1948	26 days
1949	19 days
1950	31 days
1951	20 days
1952	28 days
1953	24 days
1954	24 days
1955	27 days
1956	22 days
1957	24 days
1958	19 days
1959	26 days
1960	22 days
1961	25 days
1962	20 days
1963	29 days
1964	17 days
1965	48 days
1966	21 days
1967	49 days
1968	19 days
1969	16 days
1970	27 days
1971	19 days
1972	34 days
1973	13 days
1974	19 days
1975	32 days
1976	13 days
1977	23 days
1978	15 days
1979	15 days
1980	21 days
1981	19 days
1982	33 days
1983	25 days
1984	17 days
1985	15 days
1986	21 days
1987	29 days
1988	33 days
1989	20 days
1990	16 days
1991	20 days
1992	18 days
1993	19 days
1994	37 days
1995	21 days
1996	20 days
1997	24 days
1998	37 days
1999	25 days
2000	18 days
2001	10 days
2002	1 day
2003	13 days
2004	17 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

36 years with a frost

Across 36 years with a frost, the median last spring frost at St Helens Post Office falls on 18 September and the median first autumn frost on 17 May, which leaves a median of 243 days between them.

Fitted over all years, the growing season changes by +0.5 days per decade at this station.

Frost dates and growing season at St Helens Post Office
Measure	Median, all years	Earliest period	Recent period (1964 to 1999)	Recent against earliest	Fitted trend
Last spring frost	18 September	n/a	18 September	n/a	-1.9 days per decade
First autumn frost	17 May	n/a	19 May	n/a	-1.4 days per decade
Growing days	243 days	n/a	243 days	n/a	+0.5 days per decade

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

93 years, 1896 to 1999

A day with at least 65.4 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 197.8 mm (7.8 in) of rain is expected about once in 100 years.

Rainfall return levels at St Helens 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	65.4 mm (2.6 in)
5 years	93.4 mm (3.7 in)
10 years	114.7 mm (4.5 in)
25 years	144.9 mm (5.7 in)
50 years	170.1 mm (6.7 in)
100 years	197.8 mm (7.8 in)	Longer than the 93 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, 93 years of values from 1896 to 1999.

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: 190.4 mm (7.5 in) in 1993; 160.5 mm (6.3 in) in 1960; 157.7 mm (6.2 in) in 1946.

Download the Data

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