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Built 2026-10-15 (15 October 2026)

St Helena Island Weather Records (ASN00040337)

Record envelope, standing records and threshold days for St Helena Island (ASN00040337), Australia, with 53 years of record.

Key Facts for St Helena Island

  • St Helena Island (ASN00040337) is a weather station in Australia at -27.38 latitude and 153.22 longitude, 20 m (66 ft) above sea level.
  • The station reports from 1887 to 1939, 53 years of record.
  • 0 records set at St Helena Island still stand.
  • Records are tracked for prcp: an element needs 30 years of data to be eligible.
  • St Helena Island set a daily record precipitation of 131.1 mm (5.2 in) on 15 March 1939.

About the Station

  • Location: Australia, -27.38 latitude, 153.22 longitude.
  • Elevation: 20 m (66 ft).
  • Period of record: 1887 to 1939, 53 years.
  • Eligible elements: prcp.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at St Helena Island, with 2026 drawn through them The band shows the record high and record low for each calendar day at St Helena Island. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 000111 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at St Helena Island. 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 Helena Island, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
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Decn/an/an/an/a

Which Years Hold Standing Records

0 standing records
Standing records at St Helena Island by the year they were set 0 records at St Helena Island still stand. 00000000000
0 records at St Helena Island still stand.
Standing records at St Helena Island by the year they were set
Year setStanding records

Wettest Day of Each Month

Feb: 286.0 mm (11.3 in)
Record daily precipitation for each month at St Helena Island The wettest day on record for each calendar month at St Helena Island. The most was 286.0 mm (11.3 in) on 16 February 1893. 0100200300 Jan: 137.2 mm (5.4 in), 9 January 1898 Jan Feb: 286.0 mm (11.3 in), 16 February 1893 Feb Mar: 243.6 mm (9.6 in), 14 March 1908 Mar Apr: 194.3 mm (7.6 in), 20 April 1892 Apr May: 167.9 mm (6.6 in), 8 May 1925 May Jun: 246.4 mm (9.7 in), 2 June 1910 Jun Jul: 144.3 mm (5.7 in), 23 July 1921 Jul Aug: 93.7 mm (3.7 in), 10 August 1925 Aug Sep: 71.9 mm (2.8 in), 17 September 1932 Sep Oct: 155.7 mm (6.1 in), 19 October 1911 Oct Nov: 93.5 mm (3.7 in), 9 November 1924 Nov Dec: 141.7 mm (5.6 in), 1 December 1916 Dec
The wettest day on record for each calendar month at St Helena Island. The most was 286.0 mm (11.3 in) on 16 February 1893.
Record daily precipitation for each month at St Helena Island
MonthRecord daily precipitation (mm)Date
Jan137.2 mm (5.4 in)9 January 1898
Feb286.0 mm (11.3 in)16 February 1893
Mar243.6 mm (9.6 in)14 March 1908
Apr194.3 mm (7.6 in)20 April 1892
May167.9 mm (6.6 in)8 May 1925
Jun246.4 mm (9.7 in)2 June 1910
Jul144.3 mm (5.7 in)23 July 1921
Aug93.7 mm (3.7 in)10 August 1925
Sep71.9 mm (2.8 in)17 September 1932
Oct155.7 mm (6.1 in)19 October 1911
Nov93.5 mm (3.7 in)9 November 1924
Dec141.7 mm (5.6 in)1 December 1916

Latest Records

20
Latest records at St Helena Island
DateStationRecordValueBeat old record byOld record stoodSignificance
15 March 1939St Helena Island, AUdaily rain131.1 mm (5.2 in)29.5 mm (1.2 in)30 years28 of 100 (Routine)
5 March 1939St Helena Island, AUdaily rain49.3 mm (1.9 in)26.4 mm (1.0 in)12 years20 of 100 (Routine)
25 October 1938St Helena Island, AUdaily rain25.7 mm (1.0 in)3.9 mm (0.15 in)32 years16 of 100 (Routine)
27 May 1938St Helena Island, AUdaily rain111.8 mm (4.4 in)52.4 mm (2.1 in)38 years48 of 100 (Notable)
26 May 1938St Helena Island, AUdaily rain48.0 mm (1.9 in)20.8 mm (0.8 in)50 years32 of 100 (Routine)
24 May 1938St Helena Island, AUdaily rain69.3 mm (2.7 in)42.9 mm (1.7 in)32 years40 of 100 (Notable)
1 February 1938St Helena Island, AUdaily rain114.6 mm (4.5 in)11.7 mm (0.5 in)44 years21 of 100 (Routine)
19 January 1938St Helena Island, AUdaily rain89.2 mm (3.5 in)38.4 mm (1.5 in)11 years28 of 100 (Routine)
16 December 1937St Helena Island, AUdaily rain36.1 mm (1.4 in)15.8 mm (0.6 in)11 years17 of 100 (Routine)
8 November 1937St Helena Island, AUdaily rain19.3 mm (0.8 in)7.4 mm (0.29 in)20 years16 of 100 (Routine)
5 November 1937St Helena Island, AUdaily rain43.9 mm (1.7 in)16.0 mm (0.6 in)20 years23 of 100 (Routine)
29 October 1937St Helena Island, AUdaily rain35.3 mm (1.4 in)18.5 mm (0.7 in)20 years23 of 100 (Routine)
27 August 1937St Helena Island, AUdaily rain11.9 mm (0.5 in)2.0 mm (0.08 in)11 years10 of 100 (Routine)
15 August 1937St Helena Island, AUdaily rain7.4 mm (0.29 in)3.1 mm (0.12 in)32 years17 of 100 (Routine)
16 March 1937St Helena Island, AUdaily rain41.9 mm (1.6 in)17.8 mm (0.7 in)40 years25 of 100 (Routine)
12 June 1936St Helena Island, AUdaily rain31.8 mm (1.3 in)8.9 mm (0.35 in)24 years15 of 100 (Routine)
11 September 1935St Helena Island, AUdaily rain38.9 mm (1.5 in)16.5 mm (0.6 in)14 years22 of 100 (Routine)
10 September 1935St Helena Island, AUdaily rain12.7 mm (0.5 in)11.4 mm (0.4 in)37 years20 of 100 (Routine)
7 May 1935St Helena Island, AUdaily rain30.5 mm (1.2 in)14.5 mm (0.6 in)45 years25 of 100 (Routine)
11 February 1935St Helena Island, AUdaily rain77.0 mm (3.0 in)42.7 mm (1.7 in)23 years23 of 100 (Routine)

Extremes by Year

1887 to 1939
Yearly extremes at St Helena Island: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Wettest day (Rx1day)286.0 mm (11.3 in)1893103.1 mm (4.1 in)53
Wettest five days (Rx5day)534.9 mm (21.1 in)1931184.1 mm (7.2 in)53
Longest dry spell (CDD)55 days189730 days53

Wettest day (Rx1day)

Wettest day (Rx1day) at St Helena Island by year The wettest day of the year at St Helena Island, 1887 to 1939. The record is 286.0 mm (11.3 in) in 1893, marked on the chart; the median year is 103.1 mm (4.1 in). 010020030018901900191019201930Record: 286.0 mm (11.3 in) in 1893
The wettest day of the year at St Helena Island, 1887 to 1939. The record is 286.0 mm (11.3 in) in 1893, marked on the chart; the median year is 103.1 mm (4.1 in).
Wettest day (Rx1day) at St Helena Island by year
YearWettest day (Rx1day)
188762.7 mm (2.5 in)
188874.7 mm (2.9 in)
1889115.3 mm (4.5 in)
189088.9 mm (3.5 in)
189161.0 mm (2.4 in)
1892194.3 mm (7.6 in)
1893286.0 mm (11.3 in)
1894128.0 mm (5.0 in)
189581.3 mm (3.2 in)
1896138.4 mm (5.4 in)
189782.3 mm (3.2 in)
1898137.2 mm (5.4 in)
189990.7 mm (3.6 in)
190083.8 mm (3.3 in)
190181.0 mm (3.2 in)
190235.6 mm (1.4 in)
1903125.0 mm (4.9 in)
1904115.1 mm (4.5 in)
190577.2 mm (3.0 in)
190690.2 mm (3.6 in)
190768.6 mm (2.7 in)
1908243.6 mm (9.6 in)
190963.5 mm (2.5 in)
1910246.4 mm (9.7 in)
1911155.7 mm (6.1 in)
1912110.7 mm (4.4 in)
191395.3 mm (3.8 in)
191488.9 mm (3.5 in)
1915253.2 mm (10.0 in)
1916141.7 mm (5.6 in)
191779.2 mm (3.1 in)
191838.6 mm (1.5 in)
191979.0 mm (3.1 in)
1920103.1 mm (4.1 in)
1921144.8 mm (5.7 in)
192273.7 mm (2.9 in)
1923117.9 mm (4.6 in)
1924170.7 mm (6.7 in)
1925167.9 mm (6.6 in)
192677.2 mm (3.0 in)
1927124.5 mm (4.9 in)
1928132.1 mm (5.2 in)
1929101.9 mm (4.0 in)
1930104.1 mm (4.1 in)
1931268.7 mm (10.6 in)
193271.9 mm (2.8 in)
1933147.3 mm (5.8 in)
1934143.5 mm (5.6 in)
193590.2 mm (3.6 in)
193655.9 mm (2.2 in)
193743.9 mm (1.7 in)
1938114.6 mm (4.5 in)
1939212.6 mm (8.4 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at St Helena Island by year The wettest five days of the year at St Helena Island, 1887 to 1939. The record is 534.9 mm (21.1 in) in 1931, marked on the chart; the median year is 184.1 mm (7.2 in). 020040060018901900191019201930Record: 534.9 mm (21.1 in) in 1931
The wettest five days of the year at St Helena Island, 1887 to 1939. The record is 534.9 mm (21.1 in) in 1931, marked on the chart; the median year is 184.1 mm (7.2 in).
Wettest five days (Rx5day) at St Helena Island by year
YearWettest five days (Rx5day)
1887120.1 mm (4.7 in)
1888174.0 mm (6.9 in)
1889149.1 mm (5.9 in)
1890184.7 mm (7.3 in)
1891104.9 mm (4.1 in)
1892222.0 mm (8.7 in)
1893533.2 mm (21.0 in)
1894241.8 mm (9.5 in)
1895258.6 mm (10.2 in)
1896184.1 mm (7.2 in)
1897143.7 mm (5.7 in)
1898335.6 mm (13.2 in)
1899198.7 mm (7.8 in)
1900194.6 mm (7.7 in)
1901132.0 mm (5.2 in)
190243.0 mm (1.7 in)
1903180.6 mm (7.1 in)
1904202.4 mm (8.0 in)
1905132.9 mm (5.2 in)
1906217.0 mm (8.5 in)
1907158.6 mm (6.2 in)
1908356.7 mm (14.0 in)
1909120.7 mm (4.8 in)
1910248.9 mm (9.8 in)
1911210.6 mm (8.3 in)
1912168.1 mm (6.6 in)
1913115.3 mm (4.5 in)
1914137.7 mm (5.4 in)
1915258.5 mm (10.2 in)
1916199.9 mm (7.9 in)
1917143.7 mm (5.7 in)
191866.8 mm (2.6 in)
1919117.8 mm (4.6 in)
1920193.8 mm (7.6 in)
1921263.2 mm (10.4 in)
1922153.7 mm (6.1 in)
1923133.6 mm (5.3 in)
1924199.2 mm (7.8 in)
1925258.6 mm (10.2 in)
1926114.5 mm (4.5 in)
1927271.8 mm (10.7 in)
1928279.0 mm (11.0 in)
1929124.8 mm (4.9 in)
1930157.9 mm (6.2 in)
1931534.9 mm (21.1 in)
1932103.0 mm (4.1 in)
1933254.0 mm (10.0 in)
1934227.6 mm (9.0 in)
1935174.2 mm (6.9 in)
193658.4 mm (2.3 in)
1937136.9 mm (5.4 in)
1938286.7 mm (11.3 in)
1939372.9 mm (14.7 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at St Helena Island by year The longest dry spell of the year at St Helena Island, 1887 to 1939. The record is 55 days in 1897, marked on the chart; the median year is 30 days. 10203040506018901900191019201930Record: 55 days in 1897
The longest dry spell of the year at St Helena Island, 1887 to 1939. The record is 55 days in 1897, marked on the chart; the median year is 30 days.
Longest dry spell (CDD) at St Helena Island by year
YearLongest dry spell (CDD)
188726 days
188833 days
188920 days
189036 days
189130 days
189224 days
189334 days
189452 days
189540 days
189631 days
189755 days
189834 days
189919 days
190020 days
190139 days
190255 days
190325 days
190428 days
190528 days
190638 days
190747 days
190822 days
190928 days
191026 days
191144 days
191225 days
191337 days
191439 days
191536 days
191624 days
191749 days
191828 days
191948 days
192034 days
192121 days
192246 days
192330 days
192423 days
192519 days
192643 days
192745 days
192842 days
192927 days
193018 days
193124 days
193223 days
193319 days
193419 days
193524 days
193643 days
193737 days
193816 days
193915 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

51 years, 1888 to 1938

A day with at least 103.5 mm (4.1 in) of rain is expected about once in 2 years. A day with at least 342.2 mm (13.5 in) of rain is expected about once in 100 years.

Rainfall return levels at St Helena Island: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years103.5 mm (4.1 in)
5 years153.3 mm (6.0 in)
10 years191.3 mm (7.5 in)
25 years245.8 mm (9.7 in)
50 years291.6 mm (11.5 in)
100 years342.2 mm (13.5 in)Longer than the 51 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, 51 years of values from 1888 to 1938.

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: 286.0 mm (11.3 in) in 1893; 268.7 mm (10.6 in) in 1931; 253.2 mm (10.0 in) in 1915.

Download the Data

  • Data for St Helena Island standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for St Helena Island 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 . Last revised (2025-12-31).