Daily records
Page built 2026-10-15
Data as of 2026-10-14
Search
Built 2026-10-15 (15 October 2026)

Merriwa (Roscommon) Weather Records (ASN00061287)

Record envelope, standing records and threshold days for Merriwa (Roscommon) (ASN00061287), Australia, with 58 years of record.

Key Facts for Merriwa (Roscommon)

  • Merriwa (Roscommon) (ASN00061287) is a weather station in Australia at -32.19 latitude and 150.17 longitude, 375 m (1,230 ft) above sea level.
  • The station reports from 1969 to 2026, 58 years of record.
  • 1,464 records set at Merriwa (Roscommon) still stand.
  • Records are tracked for prcp: an element needs 30 years of data to be eligible.
  • Merriwa (Roscommon) set a daily record precipitation of 21.6 mm (0.9 in) on 26 August 2026 (provisional).

Provisional Records

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

About the Station

  • Location: Australia, -32.19 latitude, 150.17 longitude.
  • Elevation: 375 m (1,230 ft).
  • Period of record: 1969 to 2026, 58 years.
  • Eligible elements: prcp.

Daily Record Envelope and 2026

39 days at or beyond a record
Daily record high and record low at Merriwa (Roscommon), with 2026 drawn through them The band shows the record high and record low for each calendar day at Merriwa (Roscommon). The lines show the 2026 daily maximum and minimum. 39 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Merriwa (Roscommon). The lines show the 2026 daily maximum and minimum. 39 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Merriwa (Roscommon), with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan43.8 C (110.8 F)8.2 C (46.8 F)41.8 C (107.2 F)11.0 C (51.8 F)
Feb45.4 C (113.7 F)6.9 C (44.4 F)38.8 C (101.8 F)11.0 C (51.8 F)
Mar39.8 C (103.6 F)5.1 C (41.2 F)36.9 C (98.4 F)5.1 C (41.2 F)
Apr34.8 C (94.6 F)-0.6 C (30.9 F)34.8 C (94.6 F)1.5 C (34.7 F)
May28.8 C (83.8 F)-3.0 C (26.6 F)26.4 C (79.5 F)1.8 C (35.2 F)
Jun23.8 C (74.8 F)-5.8 C (21.6 F)21.2 C (70.2 F)-0.9 C (30.4 F)
Jul24.7 C (76.5 F)-6.1 C (21.0 F)21.6 C (70.9 F)-3.8 C (25.2 F)
Aug27.7 C (81.9 F)-4.5 C (23.9 F)23.5 C (74.3 F)-2.6 C (27.3 F)
Sep34.3 C (93.7 F)-3.7 C (25.3 F)33.0 C (91.4 F)-1.1 C (30.0 F)
Oct37.4 C (99.3 F)-0.2 C (31.6 F)29.3 C (84.7 F)4.3 C (39.7 F)
Nov43.0 C (109.4 F)1.6 C (34.9 F)n/an/a
Dec43.7 C (110.7 F)4.2 C (39.6 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Merriwa (Roscommon) by the year they were set 1,464 records at Merriwa (Roscommon) still stand. 2016 holds the most, with 130. 0501001502007: 122012: 402013: 932014: 932015: 1012016: 1302017: 1162018: 892019: 982020: 1062021: 1162022: 1172023: 1192024: 812025: 862026: 6720072013201520172019202120232025
1,464 records at Merriwa (Roscommon) still stand. 2016 holds the most, with 130.
Standing records at Merriwa (Roscommon) by the year they were set
Year setStanding records
200712
201240
201393
201493
2015101
2016130
2017116
201889
201998
2020106
2021116
2022117
2023119
202481
202586
202667

All-Time Record Progression

1 new records
When Merriwa (Roscommon) set new all-time records 1 all-time records were set at Merriwa (Roscommon) between 9 June 2007 and 9 June 2007. Each dot is a new record. Record daily precipitation9 June 2007: Record daily precipitation 117.0 mm (4.6 in)
1 all-time records were set at Merriwa (Roscommon) between 9 June 2007 and 9 June 2007. Each dot is a new record.
When Merriwa (Roscommon) set new all-time records
DateKindDetail
2007-06-09Record daily precipitationRecord daily precipitation 117.0 mm (4.6 in)

Wettest Day of Each Month

Jun: 117.0 mm (4.6 in)
Record daily precipitation for each month at Merriwa (Roscommon) The wettest day on record for each calendar month at Merriwa (Roscommon). The most was 117.0 mm (4.6 in) on 9 June 2007. 050100150 Jan: 85.0 mm (3.3 in), 2 January 1987 Jan Feb: 110.4 mm (4.3 in), 25 February 1976 Feb Mar: 90.6 mm (3.6 in), 30 March 2019 Mar Apr: 73.6 mm (2.9 in), 2 April 1989 Apr May: 45.2 mm (1.8 in), 6 May 1998 May Jun: 117.0 mm (4.6 in), 9 June 2007 Jun Jul: 50.0 mm (2.0 in), 4 July 2022 Jul Aug: 38.0 mm (1.5 in), 24 August 2003 Aug Sep: 44.4 mm (1.7 in), 29 September 2011 Sep Oct: 63.4 mm (2.5 in), 8 October 1985 Oct Nov: 53.6 mm (2.1 in), 26 November 2021 Nov Dec: 92.4 mm (3.6 in), 4 December 2010 Dec
The wettest day on record for each calendar month at Merriwa (Roscommon). The most was 117.0 mm (4.6 in) on 9 June 2007.
Record daily precipitation for each month at Merriwa (Roscommon)
MonthRecord daily precipitation (mm)Date
Jan85.0 mm (3.3 in)2 January 1987
Feb110.4 mm (4.3 in)25 February 1976
Mar90.6 mm (3.6 in)30 March 2019
Apr73.6 mm (2.9 in)2 April 1989
May45.2 mm (1.8 in)6 May 1998
Jun117.0 mm (4.6 in)9 June 2007
Jul50.0 mm (2.0 in)4 July 2022
Aug38.0 mm (1.5 in)24 August 2003
Sep44.4 mm (1.7 in)29 September 2011
Oct63.4 mm (2.5 in)8 October 1985
Nov53.6 mm (2.1 in)26 November 2021
Dec92.4 mm (3.6 in)4 December 2010

Period of Record Coverage

2007 to 2026
Days with data per year at Merriwa (Roscommon) 16 years of record at Merriwa (Roscommon), 2007 to 2026. 3 years have data for under 90 percent of days and are left out of rankings: 2007, 2012, 2026. 2007: 34 of 365 days2012: 153 of 366 days2013: 365 of 365 days2014: 365 of 365 days2015: 365 of 365 days2016: 360 of 366 days2017: 365 of 365 days2018: 365 of 365 days2019: 361 of 365 days2020: 365 of 366 days2021: 364 of 365 days2022: 364 of 365 days2023: 364 of 365 days2024: 365 of 366 days2025: 332 of 365 days2026: 272 of 365 days201520202025
16 years of record at Merriwa (Roscommon), 2007 to 2026. 3 years have data for under 90 percent of days and are left out of rankings: 2007, 2012, 2026.
Days with data per year at Merriwa (Roscommon)
YearDays with dataShare of yearComplete
2007349%No
201215342%No
2013365100%Yes
2014365100%Yes
2015365100%Yes
201636098%Yes
2017365100%Yes
2018365100%Yes
201936199%Yes
2020365100%Yes
2021364100%Yes
2022364100%Yes
2023364100%Yes
2024365100%Yes
202533291%Yes
202627275%No

Latest Records

20
Latest records at Merriwa (Roscommon)
DateStationRecordValueBeat old record byOld record stoodSignificance
26 August 2026Merriwa (Roscommon), AUdaily rain (Provisional)21.6 mm (0.9 in)8.6 mm (0.34 in)8 years18 of 100 (Routine)
10 August 2026Merriwa (Roscommon), AUdaily rain10.2 mm (0.4 in)6.2 mm (0.24 in)36 years20 of 100 (Routine)
28 May 2026Merriwa (Roscommon), AUdaily rain20.2 mm (0.8 in)3.4 mm (0.13 in)45 years20 of 100 (Routine)
19 May 2026Merriwa (Roscommon), AUdaily rain31.0 mm (1.2 in)7.0 mm (0.28 in)48 years27 of 100 (Routine)
21 August 2025Merriwa (Roscommon), AUdaily rain33.4 mm (1.3 in)16.2 mm (0.6 in)44 years40 of 100 (Notable)
31 July 2025Merriwa (Roscommon), AUdaily rain19.2 mm (0.8 in)4.4 mm (0.17 in)15 years15 of 100 (Routine)
27 May 2025Merriwa (Roscommon), AUdaily rain37.8 mm (1.5 in)32.8 mm (1.3 in)36 years56 of 100 (Notable)
22 May 2025Merriwa (Roscommon), AUdaily rain31.2 mm (1.2 in)9.8 mm (0.39 in)10 years20 of 100 (Routine)
29 March 2025Merriwa (Roscommon), AUdaily rain36.6 mm (1.4 in)18.2 mm (0.7 in)11 years22 of 100 (Routine)
18 November 2024Merriwa (Roscommon), AUdaily rain30.6 mm (1.2 in)10.6 mm (0.4 in)11 years19 of 100 (Routine)
17 October 2024Merriwa (Roscommon), AUdaily rain16.4 mm (0.6 in)0.2 mm (0.01 in)31 years14 of 100 (Routine)
13 September 2024Merriwa (Roscommon), AUdaily rain23.2 mm (0.9 in)9.8 mm (0.39 in)38 years20 of 100 (Routine)
30 June 2024Merriwa (Roscommon), AUdaily rain11.0 mm (0.4 in)7.0 mm (0.28 in)50 years20 of 100 (Routine)
1 June 2024Merriwa (Roscommon), AUdaily rain48.0 mm (1.9 in)22.6 mm (0.9 in)43 years39 of 100 (Notable)
12 May 2024Merriwa (Roscommon), AUdaily rain (Tie)7.4 mm (0.29 in)tie2 years1 of 100 (Routine)
6 April 2024Merriwa (Roscommon), AUdaily rain39.6 mm (1.6 in)18.3 mm (0.7 in)25 years31 of 100 (Routine)
18 January 2024Merriwa (Roscommon), AUdaily rain38.8 mm (1.5 in)18.8 mm (0.7 in)36 years29 of 100 (Routine)
5 January 2024Merriwa (Roscommon), AUdaily rain43.0 mm (1.7 in)11.8 mm (0.5 in)2 years14 of 100 (Routine)
4 January 2024Merriwa (Roscommon), AUdaily rain36.4 mm (1.4 in)4.8 mm (0.19 in)48 years22 of 100 (Routine)
5 October 2023Merriwa (Roscommon), AUdaily rain20.6 mm (0.8 in)8.0 mm (0.31 in)30 years20 of 100 (Routine)

Climate Trend

12 complete years, 2013 to 2024
Annual mean temperature at Merriwa (Roscommon) as warming stripes, 2013 to 2024 One stripe for each of 12 complete years at Merriwa (Roscommon), 2013 to 2024. Blue stripes are years cooler than the station's own mean of 16.8 C (62.2 F); red stripes are warmer. The coolest year was 2022, at 15.6 C (60.0 F), and the warmest was 2019, at 18.1 C (64.5 F). The strongest colour marks a difference of 1.3 C (2.3 F). 2013: 16.8 C, 0.0 C from the station mean2014: 17.0 C, +0.2 C from the station mean2015: 16.5 C, -0.3 C from the station mean2016: 16.7 C, -0.1 C from the station mean2017: 17.2 C, +0.5 C from the station mean2018: 17.4 C, +0.6 C from the station mean2019: 18.1 C, +1.3 C from the station mean2020: 16.4 C, -0.4 C from the station mean2021: 15.6 C, -1.2 C from the station mean2022: 15.6 C, -1.2 C from the station mean2023: 17.2 C, +0.4 C from the station mean2024: 17.1 C, +0.4 C from the station mean2013201420162018202020222024
One stripe for each of 12 complete years at Merriwa (Roscommon), 2013 to 2024. Blue stripes are years cooler than the station's own mean of 16.8 C (62.2 F); red stripes are warmer. The coolest year was 2022, at 15.6 C (60.0 F), and the warmest was 2019, at 18.1 C (64.5 F). The strongest colour marks a difference of 1.3 C (2.3 F).
Annual mean temperature at Merriwa (Roscommon) as warming stripes, 2013 to 2024
YearAnnual mean temperatureDifference from the station mean
201316.8 C-0.02 C
201417.0 C+0.18 C
201516.5 C-0.31 C
201616.7 C-0.09 C
201717.2 C+0.46 C
201817.4 C+0.58 C
201918.1 C+1.27 C
202016.4 C-0.41 C
202115.6 C-1.19 C
202215.6 C-1.21 C
202317.2 C+0.38 C
202417.1 C+0.35 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

1969 to 2026
Yearly extremes at Merriwa (Roscommon): the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)45.4 C (113.7 F)201741.0 C (105.7 F)16
Coldest night (TNn)-6.1 C (21.0 F)2023-4.4 C (24.0 F)16
Wettest day (Rx1day)117.0 mm (4.6 in)200747.5 mm (1.9 in)58
Wettest five days (Rx5day)234.4 mm (9.2 in)200777.3 mm (3.0 in)58
Longest dry spell (CDD)61 days198934 days58

Hottest day (TXx)

Hottest day (TXx) at Merriwa (Roscommon) by year The hottest day of the year at Merriwa (Roscommon), 1969 to 2026. The record is 45.4 C (113.7 F) in 2017, marked on the chart; the median year is 41.0 C (105.7 F). 20304050197019801990200020102020Record: 45.4 C (113.7 F) in 2017
The hottest day of the year at Merriwa (Roscommon), 1969 to 2026. The record is 45.4 C (113.7 F) in 2017, marked on the chart; the median year is 41.0 C (105.7 F).
Hottest day (TXx) at Merriwa (Roscommon) by year
YearHottest day (TXx)
1969n/a
1970n/a
1971n/a
1972n/a
1973n/a
1974n/a
1975n/a
1976n/a
1977n/a
1978n/a
1979n/a
1980n/a
1981n/a
1982n/a
1983n/a
1984n/a
1985n/a
1986n/a
1987n/a
1988n/a
1989n/a
1990n/a
1991n/a
1992n/a
1993n/a
1994n/a
1995n/a
1996n/a
1997n/a
1998n/a
1999n/a
2000n/a
2001n/a
2002n/a
2003n/a
2004n/a
2005n/a
2006n/a
200724.0 C (75.2 F)
2008n/a
2009n/a
2010n/a
2011n/a
201240.8 C (105.4 F)
201343.8 C (110.8 F)
201443.0 C (109.4 F)
201537.4 C (99.3 F)
201640.3 C (104.5 F)
201745.4 C (113.7 F)
201841.7 C (107.1 F)
201943.7 C (110.7 F)
202043.7 C (110.7 F)
202136.4 C (97.5 F)
202234.0 C (93.2 F)
202341.1 C (106.0 F)
202439.6 C (103.3 F)
202540.8 C (105.4 F)
202641.8 C (107.2 F)

Coldest night (TNn)

Coldest night (TNn) at Merriwa (Roscommon) by year The coldest night of the year at Merriwa (Roscommon), 1969 to 2026. The record is -6.1 C (21.0 F) in 2023, marked on the chart; the median year is -4.4 C (24.0 F). -8-6-4-202197019801990200020102020Record: -6.1 C (21.0 F) in 2023
The coldest night of the year at Merriwa (Roscommon), 1969 to 2026. The record is -6.1 C (21.0 F) in 2023, marked on the chart; the median year is -4.4 C (24.0 F).
Coldest night (TNn) at Merriwa (Roscommon) by year
YearColdest night (TNn)
1969n/a
1970n/a
1971n/a
1972n/a
1973n/a
1974n/a
1975n/a
1976n/a
1977n/a
1978n/a
1979n/a
1980n/a
1981n/a
1982n/a
1983n/a
1984n/a
1985n/a
1986n/a
1987n/a
1988n/a
1989n/a
1990n/a
1991n/a
1992n/a
1993n/a
1994n/a
1995n/a
1996n/a
1997n/a
1998n/a
1999n/a
2000n/a
2001n/a
2002n/a
2003n/a
2004n/a
2005n/a
2006n/a
20070.1 C (32.2 F)
2008n/a
2009n/a
2010n/a
2011n/a
2012-4.3 C (24.3 F)
2013-4.0 C (24.8 F)
2014-5.3 C (22.5 F)
2015-4.2 C (24.4 F)
2016-4.6 C (23.7 F)
2017-5.0 C (23.0 F)
2018-5.5 C (22.1 F)
2019-5.8 C (21.6 F)
2020-4.0 C (24.8 F)
2021-5.7 C (21.7 F)
2022-4.3 C (24.3 F)
2023-6.1 C (21.0 F)
2024-3.2 C (26.2 F)
2025-5.3 C (22.5 F)
2026-3.8 C (25.2 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Merriwa (Roscommon) by year The wettest day of the year at Merriwa (Roscommon), 1969 to 2026. The record is 117.0 mm (4.6 in) in 2007, marked on the chart; the median year is 47.5 mm (1.9 in). 0255075100125197019801990200020102020Record: 117.0 mm (4.6 in) in 2007
The wettest day of the year at Merriwa (Roscommon), 1969 to 2026. The record is 117.0 mm (4.6 in) in 2007, marked on the chart; the median year is 47.5 mm (1.9 in).
Wettest day (Rx1day) at Merriwa (Roscommon) by year
YearWettest day (Rx1day)
196923.9 mm (0.9 in)
197052.8 mm (2.1 in)
197158.9 mm (2.3 in)
197247.0 mm (1.9 in)
197353.1 mm (2.1 in)
197450.4 mm (2.0 in)
197573.8 mm (2.9 in)
1976110.4 mm (4.3 in)
197781.0 mm (3.2 in)
197832.0 mm (1.3 in)
197927.4 mm (1.1 in)
198024.6 mm (1.0 in)
198132.2 mm (1.3 in)
198250.0 mm (2.0 in)
198337.2 mm (1.5 in)
198469.0 mm (2.7 in)
198563.4 mm (2.5 in)
198636.0 mm (1.4 in)
198785.0 mm (3.3 in)
198882.2 mm (3.2 in)
198973.6 mm (2.9 in)
199064.4 mm (2.5 in)
199150.0 mm (2.0 in)
199260.0 mm (2.4 in)
199341.2 mm (1.6 in)
199435.6 mm (1.4 in)
199542.0 mm (1.7 in)
199662.0 mm (2.4 in)
199748.4 mm (1.9 in)
199845.2 mm (1.8 in)
199930.0 mm (1.2 in)
200033.3 mm (1.3 in)
200139.4 mm (1.6 in)
200262.6 mm (2.5 in)
200345.6 mm (1.8 in)
200432.4 mm (1.3 in)
200522.0 mm (0.9 in)
200646.8 mm (1.8 in)
2007117.0 mm (4.6 in)
200855.2 mm (2.2 in)
200920.0 mm (0.8 in)
201092.4 mm (3.6 in)
201144.4 mm (1.7 in)
201250.0 mm (2.0 in)
201370.4 mm (2.8 in)
201436.2 mm (1.4 in)
201540.8 mm (1.6 in)
201644.4 mm (1.7 in)
201746.0 mm (1.8 in)
201850.6 mm (2.0 in)
201990.6 mm (3.6 in)
202045.2 mm (1.8 in)
202175.6 mm (3.0 in)
202259.4 mm (2.3 in)
202329.2 mm (1.1 in)
202448.0 mm (1.9 in)
202537.8 mm (1.5 in)
202631.0 mm (1.2 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Merriwa (Roscommon) by year The wettest five days of the year at Merriwa (Roscommon), 1969 to 2026. The record is 234.4 mm (9.2 in) in 2007, marked on the chart; the median year is 77.3 mm (3.0 in). 0100200300197019801990200020102020Record: 234.4 mm (9.2 in) in 2007
The wettest five days of the year at Merriwa (Roscommon), 1969 to 2026. The record is 234.4 mm (9.2 in) in 2007, marked on the chart; the median year is 77.3 mm (3.0 in).
Wettest five days (Rx5day) at Merriwa (Roscommon) by year
YearWettest five days (Rx5day)
196955.6 mm (2.2 in)
197073.7 mm (2.9 in)
1971136.7 mm (5.4 in)
197260.5 mm (2.4 in)
1973104.8 mm (4.1 in)
1974108.4 mm (4.3 in)
197580.0 mm (3.1 in)
1976177.6 mm (7.0 in)
1977126.6 mm (5.0 in)
197863.4 mm (2.5 in)
197992.0 mm (3.6 in)
198046.6 mm (1.8 in)
198161.8 mm (2.4 in)
198281.8 mm (3.2 in)
198363.4 mm (2.5 in)
198488.2 mm (3.5 in)
198572.8 mm (2.9 in)
198660.6 mm (2.4 in)
1987133.6 mm (5.3 in)
1988102.2 mm (4.0 in)
1989126.2 mm (5.0 in)
199083.4 mm (3.3 in)
199170.7 mm (2.8 in)
1992153.6 mm (6.0 in)
199360.6 mm (2.4 in)
199450.0 mm (2.0 in)
199581.0 mm (3.2 in)
199678.8 mm (3.1 in)
199787.4 mm (3.4 in)
199866.2 mm (2.6 in)
199950.0 mm (2.0 in)
200075.8 mm (3.0 in)
200163.4 mm (2.5 in)
200270.0 mm (2.8 in)
200365.2 mm (2.6 in)
200464.6 mm (2.5 in)
200529.4 mm (1.2 in)
200674.8 mm (2.9 in)
2007234.4 mm (9.2 in)
200855.8 mm (2.2 in)
200946.6 mm (1.8 in)
2010160.2 mm (6.3 in)
2011115.0 mm (4.5 in)
2012103.6 mm (4.1 in)
201396.2 mm (3.8 in)
201482.4 mm (3.2 in)
201571.4 mm (2.8 in)
201670.8 mm (2.8 in)
201754.8 mm (2.2 in)
201883.8 mm (3.3 in)
201996.4 mm (3.8 in)
2020106.0 mm (4.2 in)
2021105.6 mm (4.2 in)
2022104.0 mm (4.1 in)
202341.2 mm (1.6 in)
202479.4 mm (3.1 in)
202566.8 mm (2.6 in)
202649.6 mm (2.0 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Merriwa (Roscommon) by year The longest dry spell of the year at Merriwa (Roscommon), 1969 to 2026. The record is 61 days in 1989, marked on the chart; the median year is 34 days. 020406080197019801990200020102020Record: 61 days in 1989
The longest dry spell of the year at Merriwa (Roscommon), 1969 to 2026. The record is 61 days in 1989, marked on the chart; the median year is 34 days.
Longest dry spell (CDD) at Merriwa (Roscommon) by year
YearLongest dry spell (CDD)
196920 days
197037 days
197144 days
197241 days
197330 days
197434 days
197529 days
197634 days
197727 days
197839 days
197926 days
198058 days
198139 days
198255 days
198321 days
198442 days
198527 days
198629 days
198734 days
198831 days
198961 days
199026 days
199126 days
199251 days
199323 days
199438 days
199555 days
199622 days
199761 days
199839 days
199954 days
200022 days
200125 days
200241 days
200333 days
200424 days
200549 days
200642 days
200750 days
200826 days
200932 days
201028 days
201138 days
201227 days
201345 days
201424 days
201537 days
201624 days
201722 days
201839 days
201934 days
202020 days
202122 days
202227 days
202339 days
202419 days
202523 days
202638 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

55 years, 1970 to 2025

A day with at least 49.0 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 124.1 mm (4.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Merriwa (Roscommon): the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years49.0 mm (1.9 in)
5 years68.0 mm (2.7 in)
10 years80.9 mm (3.2 in)
25 years97.9 mm (3.9 in)
50 years110.9 mm (4.4 in)
100 years124.1 mm (4.9 in)Longer than the 55 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, 55 years of values from 1970 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: 117.0 mm (4.6 in) in 2007; 110.4 mm (4.3 in) in 1976; 92.4 mm (3.6 in) in 2010.

Download the Data

  • Data for Merriwa (Roscommon) standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Merriwa (Roscommon) 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).