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Swanbourne Weather Records (ASN00009215)

Record envelope, standing records and threshold days for Swanbourne (ASN00009215), Australia, with 34 years of record.

Key Facts for Swanbourne

  • Swanbourne (ASN00009215) is a weather station in Australia at -31.96 latitude and 115.76 longitude, 41 m (135 ft) above sea level.
  • The station reports from 1993 to 2026, 34 years of record.
  • 1,464 records set at Swanbourne still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • Swanbourne set a daily record high minimum temperature of 14.8 C (58.6 F) on 19 September 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

  • Location: Australia, -31.96 latitude, 115.76 longitude.
  • Elevation: 41 m (135 ft).
  • Period of record: 1993 to 2026, 34 years.
  • Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

20 days at or beyond a record
Daily record high and record low at Swanbourne, with 2026 drawn through them The band shows the record high and record low for each calendar day at Swanbourne. The lines show the 2026 daily maximum and minimum. 20 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 01020304050 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Swanbourne. The lines show the 2026 daily maximum and minimum. 20 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Swanbourne, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan44.3 C (111.7 F)5.7 C (42.3 F)41.2 C (106.2 F)13.7 C (56.7 F)
Feb43.0 C (109.4 F)7.3 C (45.1 F)41.1 C (106.0 F)13.7 C (56.7 F)
Mar42.8 C (109.0 F)7.5 C (45.5 F)38.2 C (100.8 F)12.4 C (54.3 F)
Apr37.3 C (99.1 F)7.5 C (45.5 F)29.1 C (84.4 F)9.2 C (48.6 F)
May32.2 C (90.0 F)4.8 C (40.6 F)26.9 C (80.4 F)6.1 C (43.0 F)
Jun26.2 C (79.2 F)2.9 C (37.2 F)22.3 C (72.1 F)5.6 C (42.1 F)
Jul25.9 C (78.6 F)2.4 C (36.3 F)25.4 C (77.7 F)6.2 C (43.2 F)
Aug30.2 C (86.4 F)3.1 C (37.6 F)24.6 C (76.3 F)5.1 C (41.2 F)
Sep34.7 C (94.5 F)3.1 C (37.6 F)30.7 C (87.3 F)9.6 C (49.3 F)
Oct37.1 C (98.8 F)2.9 C (37.2 F)19.8 C (67.6 F)8.9 C (48.0 F)
Nov41.1 C (106.0 F)6.9 C (44.4 F)n/an/a
Dec43.7 C (110.7 F)5.7 C (42.3 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Swanbourne by the year they were set 1,464 records at Swanbourne still stand. 2019 holds the most, with 63. 0204060801993: 241994: 471995: 301996: 361997: 401998: 611999: 432000: 292001: 552002: 362003: 442004: 602005: 462006: 372007: 512008: 342009: 372010: 442011: 382012: 502013: 362014: 412015: 382016: 502017: 382018: 422019: 632020: 532021: 452022: 392023: 542024: 482025: 482026: 27199319972001200520092013201720212025
1,464 records at Swanbourne still stand. 2019 holds the most, with 63.
Standing records at Swanbourne by the year they were set
Year setStanding records
199324
199447
199530
199636
199740
199861
199943
200029
200155
200236
200344
200460
200546
200637
200751
200834
200937
201044
201138
201250
201336
201441
201538
201650
201738
201842
201963
202053
202145
202239
202354
202448
202548
202627

Wettest Day of Each Month

Jan: 138.6 mm (5.5 in)
Record daily precipitation for each month at Swanbourne The wettest day on record for each calendar month at Swanbourne. The most was 138.6 mm (5.5 in) on 16 January 2018. 050100150 Jan: 138.6 mm (5.5 in), 16 January 2018 Jan Feb: 97.4 mm (3.8 in), 10 February 2017 Feb Mar: 78.0 mm (3.1 in), 28 March 2026 Mar Apr: 64.0 mm (2.5 in), 17 April 2002 Apr May: 62.2 mm (2.4 in), 19 May 2005 May Jun: 76.0 mm (3.0 in), 5 June 2023 Jun Jul: 75.0 mm (3.0 in), 30 July 2001 Jul Aug: 82.0 mm (3.2 in), 4 August 1994 Aug Sep: 45.0 mm (1.8 in), 11 September 1994 Sep Oct: 76.0 mm (3.0 in), 18 October 1995 Oct Nov: 35.2 mm (1.4 in), 3 November 2020 Nov Dec: 30.2 mm (1.2 in), 12 December 2012 Dec
The wettest day on record for each calendar month at Swanbourne. The most was 138.6 mm (5.5 in) on 16 January 2018.
Record daily precipitation for each month at Swanbourne
MonthRecord daily precipitation (mm)Date
Jan138.6 mm (5.5 in)16 January 2018
Feb97.4 mm (3.8 in)10 February 2017
Mar78.0 mm (3.1 in)28 March 2026
Apr64.0 mm (2.5 in)17 April 2002
May62.2 mm (2.4 in)19 May 2005
Jun76.0 mm (3.0 in)5 June 2023
Jul75.0 mm (3.0 in)30 July 2001
Aug82.0 mm (3.2 in)4 August 1994
Sep45.0 mm (1.8 in)11 September 1994
Oct76.0 mm (3.0 in)18 October 1995
Nov35.2 mm (1.4 in)3 November 2020
Dec30.2 mm (1.2 in)12 December 2012

Period of Record Coverage

1993 to 2026
Days with data per year at Swanbourne 34 years of record at Swanbourne, 1993 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 1993, 2026. 1993: 106 of 365 days1994: 330 of 365 days1995: 341 of 365 days1996: 360 of 366 days1997: 359 of 365 days1998: 360 of 365 days1999: 358 of 365 days2000: 365 of 366 days2001: 363 of 365 days2002: 365 of 365 days2003: 364 of 365 days2004: 366 of 366 days2005: 360 of 365 days2006: 365 of 365 days2007: 365 of 365 days2008: 366 of 366 days2009: 365 of 365 days2010: 365 of 365 days2011: 363 of 365 days2012: 365 of 366 days2013: 364 of 365 days2014: 365 of 365 days2015: 364 of 365 days2016: 366 of 366 days2017: 365 of 365 days2018: 364 of 365 days2019: 363 of 365 days2020: 364 of 366 days2021: 364 of 365 days2022: 364 of 365 days2023: 362 of 365 days2024: 365 of 366 days2025: 364 of 365 days2026: 274 of 365 days1995200020052010201520202025
34 years of record at Swanbourne, 1993 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 1993, 2026.
Days with data per year at Swanbourne
YearDays with dataShare of yearComplete
199310629%No
199433090%Yes
199534193%Yes
199636098%Yes
199735998%Yes
199836099%Yes
199935898%Yes
2000365100%Yes
200136399%Yes
2002365100%Yes
2003364100%Yes
2004366100%Yes
200536099%Yes
2006365100%Yes
2007365100%Yes
2008366100%Yes
2009365100%Yes
2010365100%Yes
201136399%Yes
2012365100%Yes
2013364100%Yes
2014365100%Yes
2015364100%Yes
2016366100%Yes
2017365100%Yes
2018364100%Yes
201936399%Yes
202036499%Yes
2021364100%Yes
2022364100%Yes
202336299%Yes
2024365100%Yes
2025364100%Yes
202627475%No

Latest Records

20
Latest records at Swanbourne
DateStationRecordValueBeat old record byOld record stoodSignificance
19 September 2026Swanbourne, AUdaily high min (Provisional)14.8 C (58.6 F)0.1 C (0.2 F)21 years9 of 100 (Routine)
18 September 2026Swanbourne, AUdaily high max (Provisional)24.7 C (76.5 F)1.2 C (2.2 F)8 years9 of 100 (Routine)
17 September 2026Swanbourne, AUmonthly high min (Provisional)19.1 C (66.4 F)0.1 C (0.2 F)11 years16 of 100 (Routine)
17 September 2026Swanbourne, AUdaily high max (Provisional)27.1 C (80.8 F)1.8 C (3.2 F)1 year9 of 100 (Routine)
16 September 2026Swanbourne, AUdaily high min (Provisional)16.6 C (61.9 F)1.2 C (2.2 F)20 years13 of 100 (Routine)
16 September 2026Swanbourne, AUdaily high max (Provisional)30.7 C (87.3 F)1.5 C (2.7 F)13 years12 of 100 (Routine)
12 September 2026Swanbourne, AUdaily high min (Provisional)15.5 C (59.9 F)0.2 C (0.4 F)32 years12 of 100 (Routine)
30 August 2026Swanbourne, AUdaily high max (Provisional)23.8 C (74.8 F)0.8 C (1.4 F)3 years6 of 100 (Routine)
14 August 2026Swanbourne, AUdaily high max22.9 C (73.2 F)0.5 C (0.9 F)12 years8 of 100 (Routine)
8 August 2026Swanbourne, AUdaily low max12.9 C (55.2 F)2.0 C (3.6 F)9 years13 of 100 (Routine)
4 August 2026Swanbourne, AUdaily high min (Tie)14.7 C (58.5 F)tie7 years1 of 100 (Routine)
17 July 2026Swanbourne, AUdaily high min (Tie)14.9 C (58.8 F)tie1 year0 of 100 (Routine)
15 July 2026Swanbourne, AUdaily high max25.4 C (77.7 F)3.7 C (6.7 F)16 years26 of 100 (Routine)
9 July 2026Swanbourne, AUdaily high max21.0 C (69.8 F)0.2 C (0.4 F)8 years6 of 100 (Routine)
25 June 2026Swanbourne, AUdaily high max22.3 C (72.1 F)0.9 C (1.6 F)24 years14 of 100 (Routine)
18 June 2026Swanbourne, AUdaily low max15.1 C (59.2 F)0.6 C (1.1 F)20 years11 of 100 (Routine)
16 June 2026Swanbourne, AUdaily low min5.6 C (42.1 F)0.3 C (0.5 F)12 years7 of 100 (Routine)
15 June 2026Swanbourne, AUdaily rain27.8 mm (1.1 in)6.6 mm (0.26 in)16 years13 of 100 (Routine)
15 June 2026Swanbourne, AUdaily low max14.7 C (58.5 F)0.4 C (0.7 F)16 years8 of 100 (Routine)
12 June 2026Swanbourne, AUdaily rain31.0 mm (1.2 in)14.4 mm (0.6 in)7 years19 of 100 (Routine)

Climate Trend

32 complete years, 1994 to 2025
Annual mean temperature at Swanbourne as warming stripes, 1994 to 2025 One stripe for each of 32 complete years at Swanbourne, 1994 to 2025. Blue stripes are years cooler than the station's own mean of 19.1 C (66.4 F); red stripes are warmer. The coolest year was 2005, at 18.2 C (64.7 F), and the warmest was 2011, at 20.2 C (68.4 F). The strongest colour marks a difference of 1.2 C (2.2 F). 1994: 19.1 C, 0.0 C from the station mean1995: 18.7 C, -0.4 C from the station mean1996: 18.9 C, -0.2 C from the station mean1997: 18.8 C, -0.3 C from the station mean1998: 18.6 C, -0.5 C from the station mean1999: 19.1 C, 0.0 C from the station mean2000: 19.1 C, 0.0 C from the station mean2001: 18.2 C, -0.9 C from the station mean2002: 18.9 C, -0.2 C from the station mean2003: 18.9 C, -0.2 C from the station mean2004: 18.8 C, -0.3 C from the station mean2005: 18.2 C, -0.9 C from the station mean2006: 18.9 C, -0.2 C from the station mean2007: 18.8 C, -0.3 C from the station mean2008: 18.8 C, -0.3 C from the station mean2009: 19.0 C, -0.1 C from the station mean2010: 19.2 C, +0.1 C from the station mean2011: 20.2 C, +1.1 C from the station mean2012: 19.8 C, +0.7 C from the station mean2013: 19.9 C, +0.8 C from the station mean2014: 19.7 C, +0.6 C from the station mean2015: 19.6 C, +0.5 C from the station mean2016: 18.5 C, -0.6 C from the station mean2017: 19.0 C, -0.1 C from the station mean2018: 18.7 C, -0.4 C from the station mean2019: 19.2 C, +0.1 C from the station mean2020: 19.4 C, +0.3 C from the station mean2021: 19.0 C, -0.1 C from the station mean2022: 19.1 C, 0.0 C from the station mean2023: 19.5 C, +0.4 C from the station mean2024: 20.1 C, +1.0 C from the station mean2025: 19.6 C, +0.5 C from the station mean1994200020052010201520202025
One stripe for each of 32 complete years at Swanbourne, 1994 to 2025. Blue stripes are years cooler than the station's own mean of 19.1 C (66.4 F); red stripes are warmer. The coolest year was 2005, at 18.2 C (64.7 F), and the warmest was 2011, at 20.2 C (68.4 F). The strongest colour marks a difference of 1.2 C (2.2 F).
Annual mean temperature at Swanbourne as warming stripes, 1994 to 2025
YearAnnual mean temperatureDifference from the station mean
199419.1 C+0.02 C
199518.7 C-0.37 C
199618.9 C-0.24 C
199718.8 C-0.27 C
199818.6 C-0.50 C
199919.1 C-0.05 C
200019.1 C+0.00 C
200118.2 C-0.90 C
200218.9 C-0.25 C
200318.9 C-0.16 C
200418.8 C-0.26 C
200518.2 C-0.95 C
200618.9 C-0.19 C
200718.8 C-0.27 C
200818.8 C-0.34 C
200919.0 C-0.08 C
201019.2 C+0.08 C
201120.2 C+1.10 C
201219.8 C+0.67 C
201319.9 C+0.76 C
201419.7 C+0.64 C
201519.6 C+0.54 C
201618.5 C-0.62 C
201719.0 C-0.14 C
201818.7 C-0.38 C
201919.2 C+0.10 C
202019.4 C+0.29 C
202119.0 C-0.09 C
202219.1 C-0.03 C
202319.5 C+0.37 C
202420.1 C+1.04 C
202519.6 C+0.46 C

The annual mean temperature here has risen by 0.3 C (0.1 to 0.4) per decade over 1994 to 2025. In Fahrenheit: 0.5 F (0.1 to 0.8) per decade. The slope is a straight line fitted to 32 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Swanbourne
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.3 C (0.1 to 0.4) per decade0.5 F (0.1 to 0.8) per decade1994 to 202532Rise
Mean daily maximum0.21 C (-0.03 to 0.46) per decade0.4 F (-0.1 to 0.8) per decade1994 to 202532Not clearly different from zero
Mean daily minimum0.3 C (0.2 to 0.4) per decade0.5 F (0.3 to 0.8) per decade1994 to 202532Rise

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

1993 to 2026
Yearly extremes at Swanbourne: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)44.3 C (111.7 F)201441.1 C (106.0 F)34
Coldest night (TNn)2.4 C (36.3 F)19974.3 C (39.7 F)34
Wettest day (Rx1day)138.6 mm (5.5 in)201852.9 mm (2.1 in)34
Wettest five days (Rx5day)145.6 mm (5.7 in)201885.9 mm (3.4 in)34
Longest dry spell (CDD)90 days202445 days34

Hottest day (TXx)

Hottest day (TXx) at Swanbourne by year The hottest day of the year at Swanbourne, 1993 to 2026. The record is 44.3 C (111.7 F) in 2014, marked on the chart; the median year is 41.1 C (106.0 F). 3840424446200020102020Record: 44.3 C (111.7 F) in 2014
The hottest day of the year at Swanbourne, 1993 to 2026. The record is 44.3 C (111.7 F) in 2014, marked on the chart; the median year is 41.1 C (106.0 F).
Hottest day (TXx) at Swanbourne by year
YearHottest day (TXx)
199340.0 C (104.0 F)
199441.1 C (106.0 F)
199540.1 C (104.2 F)
199640.6 C (105.1 F)
199743.0 C (109.4 F)
199841.5 C (106.7 F)
199939.9 C (103.8 F)
200040.2 C (104.4 F)
200139.8 C (103.6 F)
200239.9 C (103.8 F)
200341.1 C (106.0 F)
200442.1 C (107.8 F)
200542.6 C (108.7 F)
200639.3 C (102.7 F)
200743.0 C (109.4 F)
200840.7 C (105.3 F)
200940.8 C (105.4 F)
201042.9 C (109.2 F)
201140.1 C (104.2 F)
201243.1 C (109.6 F)
201340.9 C (105.6 F)
201444.3 C (111.7 F)
201543.2 C (109.8 F)
201642.8 C (109.0 F)
201740.1 C (104.2 F)
201839.0 C (102.2 F)
201940.0 C (104.0 F)
202042.1 C (107.8 F)
202143.7 C (110.7 F)
202241.3 C (106.3 F)
202340.2 C (104.4 F)
202443.0 C (109.4 F)
202543.0 C (109.4 F)
202641.2 C (106.2 F)

Coldest night (TNn)

Coldest night (TNn) at Swanbourne by year The coldest night of the year at Swanbourne, 1993 to 2026. The record is 2.4 C (36.3 F) in 1997, marked on the chart; the median year is 4.3 C (39.7 F). 234567200020102020Record: 2.4 C (36.3 F) in 1997
The coldest night of the year at Swanbourne, 1993 to 2026. The record is 2.4 C (36.3 F) in 1997, marked on the chart; the median year is 4.3 C (39.7 F).
Coldest night (TNn) at Swanbourne by year
YearColdest night (TNn)
19932.9 C (37.2 F)
19945.0 C (41.0 F)
19954.0 C (39.2 F)
19965.0 C (41.0 F)
19972.4 C (36.3 F)
19982.5 C (36.5 F)
19994.5 C (40.1 F)
20004.2 C (39.6 F)
20013.6 C (38.5 F)
20023.2 C (37.8 F)
20035.3 C (41.5 F)
20043.1 C (37.6 F)
20052.8 C (37.0 F)
20063.7 C (38.7 F)
20075.2 C (41.4 F)
20083.1 C (37.6 F)
20094.1 C (39.4 F)
20102.9 C (37.2 F)
20114.7 C (40.5 F)
20123.9 C (39.0 F)
20134.4 C (39.9 F)
20144.8 C (40.6 F)
20153.7 C (38.7 F)
20163.4 C (38.1 F)
20175.1 C (41.2 F)
20185.2 C (41.4 F)
20194.6 C (40.3 F)
20206.1 C (43.0 F)
20215.1 C (41.2 F)
20225.2 C (41.4 F)
20234.5 C (40.1 F)
20245.6 C (42.1 F)
20252.8 C (37.0 F)
20265.1 C (41.2 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Swanbourne by year The wettest day of the year at Swanbourne, 1993 to 2026. The record is 138.6 mm (5.5 in) in 2018, marked on the chart; the median year is 52.9 mm (2.1 in). 050100150200020102020Record: 138.6 mm (5.5 in) in 2018
The wettest day of the year at Swanbourne, 1993 to 2026. The record is 138.6 mm (5.5 in) in 2018, marked on the chart; the median year is 52.9 mm (2.1 in).
Wettest day (Rx1day) at Swanbourne by year
YearWettest day (Rx1day)
19932.0 mm (0.08 in)
199482.0 mm (3.2 in)
199576.0 mm (3.0 in)
199657.0 mm (2.2 in)
199751.8 mm (2.0 in)
199848.0 mm (1.9 in)
199957.0 mm (2.2 in)
200079.0 mm (3.1 in)
200175.0 mm (3.0 in)
200264.0 mm (2.5 in)
200341.0 mm (1.6 in)
200426.8 mm (1.1 in)
200562.2 mm (2.4 in)
200632.8 mm (1.3 in)
200742.0 mm (1.7 in)
200832.0 mm (1.3 in)
200923.8 mm (0.9 in)
201048.4 mm (1.9 in)
201163.8 mm (2.5 in)
201256.2 mm (2.2 in)
201356.8 mm (2.2 in)
201451.0 mm (2.0 in)
201551.4 mm (2.0 in)
201640.0 mm (1.6 in)
201797.4 mm (3.8 in)
2018138.6 mm (5.5 in)
201964.6 mm (2.5 in)
202035.2 mm (1.4 in)
202144.6 mm (1.8 in)
202238.2 mm (1.5 in)
202376.0 mm (3.0 in)
202447.8 mm (1.9 in)
202554.0 mm (2.1 in)
202678.0 mm (3.1 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Swanbourne by year The wettest five days of the year at Swanbourne, 1993 to 2026. The record is 145.6 mm (5.7 in) in 2018, marked on the chart; the median year is 85.9 mm (3.4 in). 050100150200020102020Record: 145.6 mm (5.7 in) in 2018
The wettest five days of the year at Swanbourne, 1993 to 2026. The record is 145.6 mm (5.7 in) in 2018, marked on the chart; the median year is 85.9 mm (3.4 in).
Wettest five days (Rx5day) at Swanbourne by year
YearWettest five days (Rx5day)
19933.0 mm (0.12 in)
1994110.0 mm (4.3 in)
199589.0 mm (3.5 in)
1996133.0 mm (5.2 in)
199792.4 mm (3.6 in)
199875.0 mm (3.0 in)
199965.2 mm (2.6 in)
200091.2 mm (3.6 in)
200191.6 mm (3.6 in)
200276.0 mm (3.0 in)
200367.0 mm (2.6 in)
200449.8 mm (2.0 in)
200594.6 mm (3.7 in)
200649.2 mm (1.9 in)
200773.8 mm (2.9 in)
200865.2 mm (2.6 in)
200969.8 mm (2.7 in)
201086.2 mm (3.4 in)
2011117.0 mm (4.6 in)
201263.8 mm (2.5 in)
201384.2 mm (3.3 in)
201483.2 mm (3.3 in)
201597.8 mm (3.9 in)
201693.8 mm (3.7 in)
2017135.8 mm (5.3 in)
2018145.6 mm (5.7 in)
201988.4 mm (3.5 in)
202052.2 mm (2.1 in)
202169.4 mm (2.7 in)
202285.6 mm (3.4 in)
2023132.2 mm (5.2 in)
202478.0 mm (3.1 in)
2025112.2 mm (4.4 in)
202688.0 mm (3.5 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Swanbourne by year The longest dry spell of the year at Swanbourne, 1993 to 2026. The record is 90 days in 2024, marked on the chart; the median year is 45 days. 20406080100200020102020Record: 90 days in 2024
The longest dry spell of the year at Swanbourne, 1993 to 2026. The record is 90 days in 2024, marked on the chart; the median year is 45 days.
Longest dry spell (CDD) at Swanbourne by year
YearLongest dry spell (CDD)
199349 days
199488 days
199582 days
199643 days
199754 days
199852 days
199943 days
200045 days
200141 days
200260 days
200338 days
200454 days
200544 days
200643 days
200737 days
200829 days
200956 days
201081 days
201165 days
201259 days
201351 days
201488 days
201538 days
201630 days
201739 days
201856 days
201941 days
202040 days
202139 days
202238 days
202354 days
202490 days
202522 days
202640 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

32 years, 1994 to 2025

A day with at least 52.4 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 131.9 mm (5.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Swanbourne: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years52.4 mm (2.1 in)
5 years71.8 mm (2.8 in)
10 years85.4 mm (3.4 in)
25 years103.5 mm (4.1 in)
50 years117.5 mm (4.6 in)Longer than the 32 years of record
100 years131.9 mm (5.2 in)Longer than the 32 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, 32 years of values from 1994 to 2025.

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: 138.6 mm (5.5 in) in 2018; 97.4 mm (3.8 in) in 2017; 82.0 mm (3.2 in) in 1994.

Download the Data

  • Data for Swanbourne standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Swanbourne 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-14).