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Built 2026-10-17 (17 October 2026)

Merimasku Sannainen Weather Records (FIE00141850)

Record envelope, standing records and threshold days for Merimasku Sannainen (FIE00141850), Finland, with 44 years of record.

Key Facts for Merimasku Sannainen

  • Merimasku Sannainen (FIE00141850) is a weather station in Finland at 60.45 latitude and 21.85 longitude, 13 m (43 ft) above sea level.
  • The station reports from 1965 to 2008, 44 years of record.
  • 0 records set at Merimasku Sannainen still stand.
  • Records are tracked for prcp: an element needs 30 years of data to be eligible.
  • Merimasku Sannainen set a daily record precipitation of 18.0 mm (0.7 in) on 23 June 2008.

About the Station

  • Location: Finland, 60.45 latitude, 21.85 longitude.
  • Elevation: 13 m (43 ft).
  • Period of record: 1965 to 2008, 44 years.
  • Eligible elements: prcp.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Merimasku Sannainen, with 2026 drawn through them The band shows the record high and record low for each calendar day at Merimasku Sannainen. 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 Merimasku Sannainen. 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 Merimasku Sannainen, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
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Which Years Hold Standing Records

0 standing records
Standing records at Merimasku Sannainen by the year they were set 0 records at Merimasku Sannainen still stand. 00000000000
0 records at Merimasku Sannainen still stand.
Standing records at Merimasku Sannainen by the year they were set
Year setStanding records

All-Time Record Progression

1 new records
When Merimasku Sannainen set new all-time records 1 all-time records were set at Merimasku Sannainen between 27 August 2001 and 27 August 2001. Each dot is a new record. Record daily precipitation27 August 2001: Record daily precipitation 97.0 mm (3.8 in)
1 all-time records were set at Merimasku Sannainen between 27 August 2001 and 27 August 2001. Each dot is a new record.
When Merimasku Sannainen set new all-time records
DateKindDetail
2001-08-27Record daily precipitationRecord daily precipitation 97.0 mm (3.8 in)

Wettest Day of Each Month

Aug: 97.0 mm (3.8 in)
Record daily precipitation for each month at Merimasku Sannainen The wettest day on record for each calendar month at Merimasku Sannainen. The most was 97.0 mm (3.8 in) on 27 August 2001. 0255075100 Jan: 31.0 mm (1.2 in), 24 January 2002 Jan Feb: 18.0 mm (0.7 in), 19 February 1990 Feb Mar: 30.0 mm (1.2 in), 11 March 1989 Mar Apr: 24.0 mm (0.9 in), 22 April 1968 Apr May: 22.0 mm (0.9 in), 25 May 1996 May Jun: 33.5 mm (1.3 in), 3 June 1989 Jun Jul: 51.0 mm (2.0 in), 17 July 1985 Jul Aug: 97.0 mm (3.8 in), 27 August 2001 Aug Sep: 40.5 mm (1.6 in), 6 September 1997 Sep Oct: 43.0 mm (1.7 in), 25 October 1980 Oct Nov: 30.1 mm (1.2 in), 18 November 1980 Nov Dec: 34.0 mm (1.3 in), 30 December 1983 Dec
The wettest day on record for each calendar month at Merimasku Sannainen. The most was 97.0 mm (3.8 in) on 27 August 2001.
Record daily precipitation for each month at Merimasku Sannainen
MonthRecord daily precipitation (mm)Date
Jan31.0 mm (1.2 in)24 January 2002
Feb18.0 mm (0.7 in)19 February 1990
Mar30.0 mm (1.2 in)11 March 1989
Apr24.0 mm (0.9 in)22 April 1968
May22.0 mm (0.9 in)25 May 1996
Jun33.5 mm (1.3 in)3 June 1989
Jul51.0 mm (2.0 in)17 July 1985
Aug97.0 mm (3.8 in)27 August 2001
Sep40.5 mm (1.6 in)6 September 1997
Oct43.0 mm (1.7 in)25 October 1980
Nov30.1 mm (1.2 in)18 November 1980
Dec34.0 mm (1.3 in)30 December 1983

Latest Records

20
Latest records at Merimasku Sannainen
DateStationRecordValueBeat old record byOld record stoodSignificance
23 June 2008Merimasku Sannainen, FIdaily rain18.0 mm (0.7 in)0.5 mm (0.02 in)14 years8 of 100 (Routine)
14 June 2008Merimasku Sannainen, FIdaily rain16.8 mm (0.7 in)9.3 mm (0.37 in)23 years20 of 100 (Routine)
13 April 2008Merimasku Sannainen, FIdaily rain9.5 mm (0.37 in)3.2 mm (0.13 in)8 years13 of 100 (Routine)
8 April 2008Merimasku Sannainen, FIdaily rain12.2 mm (0.5 in)3.1 mm (0.12 in)26 years18 of 100 (Routine)
29 February 2008Merimasku Sannainen, FIdaily rain7.5 mm (0.30 in)2.0 mm (0.08 in)12 years12 of 100 (Routine)
24 February 2008Merimasku Sannainen, FIdaily rain8.6 mm (0.34 in)0.6 mm (0.02 in)22 years11 of 100 (Routine)
30 January 2008Merimasku Sannainen, FIdaily rain13.1 mm (0.5 in)5.4 mm (0.21 in)40 years20 of 100 (Routine)
19 January 2008Merimasku Sannainen, FIdaily rain14.0 mm (0.6 in)6.2 mm (0.24 in)21 years20 of 100 (Routine)
18 January 2008Merimasku Sannainen, FIdaily rain15.0 mm (0.6 in)1.8 mm (0.07 in)24 years15 of 100 (Routine)
8 December 2007Merimasku Sannainen, FIdaily rain (Tie)12.0 mm (0.5 in)tie18 years2 of 100 (Routine)
7 December 2007Merimasku Sannainen, FIdaily rain29.0 mm (1.1 in)12.0 mm (0.5 in)36 years41 of 100 (Notable)
30 November 2007Merimasku Sannainen, FIdaily rain8.0 mm (0.31 in)0.2 mm (0.01 in)25 years11 of 100 (Routine)
10 November 2007Merimasku Sannainen, FIdaily rain27.0 mm (1.1 in)10.5 mm (0.4 in)32 years33 of 100 (Routine)
9 November 2007Merimasku Sannainen, FIdaily rain20.0 mm (0.8 in)7.3 mm (0.29 in)10 years20 of 100 (Routine)
6 November 2007Merimasku Sannainen, FIdaily rain (Tie)11.0 mm (0.4 in)tie20 years2 of 100 (Routine)
11 October 2007Merimasku Sannainen, FIdaily rain14.5 mm (0.6 in)1.7 mm (0.07 in)26 years14 of 100 (Routine)
31 July 2007Merimasku Sannainen, FIdaily rain23.0 mm (0.9 in)5.5 mm (0.22 in)2 years10 of 100 (Routine)
30 July 2007Merimasku Sannainen, FIdaily rain27.0 mm (1.1 in)10.0 mm (0.4 in)9 years18 of 100 (Routine)
8 July 2007Merimasku Sannainen, FIdaily rain32.0 mm (1.3 in)19.0 mm (0.7 in)37 years38 of 100 (Notable)
27 June 2007Merimasku Sannainen, FIdaily rain29.5 mm (1.2 in)4.3 mm (0.17 in)0 years11 of 100 (Routine)

Extremes by Year

1965 to 2008
Yearly extremes at Merimasku Sannainen: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Wettest day (Rx1day)97.0 mm (3.8 in)200130.5 mm (1.2 in)43
Wettest five days (Rx5day)106.5 mm (4.2 in)199355.4 mm (2.2 in)43
Longest dry spell (CDD)37 days197223 days43

Wettest day (Rx1day)

Wettest day (Rx1day) at Merimasku Sannainen by year The wettest day of the year at Merimasku Sannainen, 1965 to 2008. The record is 97.0 mm (3.8 in) in 2001, marked on the chart; the median year is 30.5 mm (1.2 in). 0204060801001970198019902000Record: 97.0 mm (3.8 in) in 2001
The wettest day of the year at Merimasku Sannainen, 1965 to 2008. The record is 97.0 mm (3.8 in) in 2001, marked on the chart; the median year is 30.5 mm (1.2 in).
Wettest day (Rx1day) at Merimasku Sannainen by year
YearWettest day (Rx1day)
196518.9 mm (0.7 in)
196640.8 mm (1.6 in)
196824.0 mm (0.9 in)
196938.0 mm (1.5 in)
197024.0 mm (0.9 in)
197129.2 mm (1.1 in)
197225.6 mm (1.0 in)
197321.0 mm (0.8 in)
197426.8 mm (1.1 in)
197520.3 mm (0.8 in)
197620.5 mm (0.8 in)
197728.0 mm (1.1 in)
197820.0 mm (0.8 in)
197926.5 mm (1.0 in)
198043.0 mm (1.7 in)
198130.5 mm (1.2 in)
198233.0 mm (1.3 in)
198334.0 mm (1.3 in)
198437.0 mm (1.5 in)
198551.0 mm (2.0 in)
198643.5 mm (1.7 in)
198744.5 mm (1.8 in)
198825.0 mm (1.0 in)
198933.5 mm (1.3 in)
199034.0 mm (1.3 in)
199138.0 mm (1.5 in)
199234.5 mm (1.4 in)
199351.0 mm (2.0 in)
199426.0 mm (1.0 in)
199524.0 mm (0.9 in)
199622.0 mm (0.9 in)
199743.0 mm (1.7 in)
199818.0 mm (0.7 in)
199929.0 mm (1.1 in)
200026.5 mm (1.0 in)
200197.0 mm (3.8 in)
200245.7 mm (1.8 in)
200329.5 mm (1.2 in)
200440.0 mm (1.6 in)
200533.5 mm (1.3 in)
200632.5 mm (1.3 in)
200732.0 mm (1.3 in)
200818.0 mm (0.7 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Merimasku Sannainen by year The wettest five days of the year at Merimasku Sannainen, 1965 to 2008. The record is 106.5 mm (4.2 in) in 1993, marked on the chart; the median year is 55.4 mm (2.2 in). 204060801001201970198019902000Record: 106.5 mm (4.2 in) in 1993
The wettest five days of the year at Merimasku Sannainen, 1965 to 2008. The record is 106.5 mm (4.2 in) in 1993, marked on the chart; the median year is 55.4 mm (2.2 in).
Wettest five days (Rx5day) at Merimasku Sannainen by year
YearWettest five days (Rx5day)
196542.9 mm (1.7 in)
196652.2 mm (2.1 in)
196858.9 mm (2.3 in)
196964.4 mm (2.5 in)
197037.6 mm (1.5 in)
197146.0 mm (1.8 in)
197243.7 mm (1.7 in)
197328.7 mm (1.1 in)
197450.4 mm (2.0 in)
197531.1 mm (1.2 in)
197627.6 mm (1.1 in)
197760.5 mm (2.4 in)
197847.1 mm (1.9 in)
197965.4 mm (2.6 in)
198075.5 mm (3.0 in)
198175.7 mm (3.0 in)
198248.1 mm (1.9 in)
198350.0 mm (2.0 in)
198450.5 mm (2.0 in)
198561.8 mm (2.4 in)
198670.7 mm (2.8 in)
198769.9 mm (2.8 in)
198855.4 mm (2.2 in)
198947.5 mm (1.9 in)
199055.7 mm (2.2 in)
199171.6 mm (2.8 in)
199260.5 mm (2.4 in)
1993106.5 mm (4.2 in)
199449.0 mm (1.9 in)
199544.6 mm (1.8 in)
199643.0 mm (1.7 in)
199796.0 mm (3.8 in)
199852.4 mm (2.1 in)
199963.6 mm (2.5 in)
200044.1 mm (1.7 in)
2001100.1 mm (3.9 in)
200281.5 mm (3.2 in)
200345.0 mm (1.8 in)
200472.7 mm (2.9 in)
200593.8 mm (3.7 in)
200658.8 mm (2.3 in)
200762.8 mm (2.5 in)
200844.4 mm (1.7 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Merimasku Sannainen by year The longest dry spell of the year at Merimasku Sannainen, 1965 to 2008. The record is 37 days in 1972, marked on the chart; the median year is 23 days. 102030401970198019902000Record: 37 days in 1972
The longest dry spell of the year at Merimasku Sannainen, 1965 to 2008. The record is 37 days in 1972, marked on the chart; the median year is 23 days.
Longest dry spell (CDD) at Merimasku Sannainen by year
YearLongest dry spell (CDD)
196520 days
196618 days
196819 days
196926 days
197021 days
197134 days
197237 days
197315 days
197420 days
197517 days
197626 days
197716 days
197823 days
197917 days
198023 days
198120 days
198223 days
198322 days
198421 days
198520 days
198617 days
198729 days
198816 days
198922 days
199030 days
199117 days
199222 days
199329 days
199425 days
199533 days
199631 days
199722 days
199823 days
199923 days
200023 days
200121 days
200237 days
200336 days
200413 days
200524 days
200629 days
200729 days
200827 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

42 years, 1965 to 2007

A day with at least 30.3 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 79.5 mm (3.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Merimasku Sannainen: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years30.3 mm (1.2 in)
5 years40.6 mm (1.6 in)
10 years48.4 mm (1.9 in)
25 years59.6 mm (2.3 in)
50 years69.1 mm (2.7 in)Longer than the 42 years of record
100 years79.5 mm (3.1 in)Longer than the 42 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, 42 years of values from 1965 to 2007.

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: 97.0 mm (3.8 in) in 2001; 51.0 mm (2.0 in) in 1985; 51.0 mm (2.0 in) in 1993.

Download the Data

  • Data for Merimasku Sannainen standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Merimasku Sannainen 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 (2025-12-31).