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Data as of 2025-12-31
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Built 2026-10-16 (16 October 2026)

Merriman Dam Weather Records (USC00305276)

Record envelope, standing records and threshold days for Merriman Dam (USC00305276), New York, United States, with 43 years of record.

Key Facts for Merriman Dam

  • Merriman Dam (USC00305276) is a weather station in New York, United States at 41.80 latitude and -74.43 longitude, 264 m (865 ft) above sea level.
  • The station reports from 1961 to 2003, 43 years of record.
  • 0 records set at Merriman Dam still stand.
  • Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Merriman Dam set a daily record precipitation of 32.0 mm (1.3 in) on 18 February 2003.

About the Station

  • Location: New York, United States, 41.80 latitude, -74.43 longitude.
  • Elevation: 264 m (865 ft).
  • Period of record: 1961 to 2003, 43 years.
  • Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Merriman Dam, with 2026 drawn through them The band shows the record high and record low for each calendar day at Merriman Dam. 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 Merriman Dam. 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 Merriman Dam, 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 Merriman Dam by the year they were set 0 records at Merriman Dam still stand. 00000000000
0 records at Merriman Dam still stand.
Standing records at Merriman Dam by the year they were set
Year setStanding records

Wettest Day of Each Month

Mar: 115.3 mm (4.5 in)
Record daily precipitation for each month at Merriman Dam The wettest day on record for each calendar month at Merriman Dam. The most was 115.3 mm (4.5 in) on 22 March 1980. 050100150 Jan: 63.8 mm (2.5 in), 9 January 1978 Jan Feb: 50.8 mm (2.0 in), 25 February 1977 Feb Mar: 115.3 mm (4.5 in), 22 March 1980 Mar Apr: 101.6 mm (4.0 in), 5 April 1987 Apr May: 79.8 mm (3.1 in), 12 May 1981 May Jun: 95.8 mm (3.8 in), 10 June 1966 Jun Jul: 85.3 mm (3.4 in), 23 July 1967 Jul Aug: 113.8 mm (4.5 in), 28 August 1971 Aug Sep: 109.0 mm (4.3 in), 17 September 1999 Sep Oct: 88.9 mm (3.5 in), 20 October 1996 Oct Nov: 71.6 mm (2.8 in), 9 November 1972 Nov Dec: 58.9 mm (2.3 in), 21 December 1973 Dec
The wettest day on record for each calendar month at Merriman Dam. The most was 115.3 mm (4.5 in) on 22 March 1980.
Record daily precipitation for each month at Merriman Dam
MonthRecord daily precipitation (mm)Date
Jan63.8 mm (2.5 in)9 January 1978
Feb50.8 mm (2.0 in)25 February 1977
Mar115.3 mm (4.5 in)22 March 1980
Apr101.6 mm (4.0 in)5 April 1987
May79.8 mm (3.1 in)12 May 1981
Jun95.8 mm (3.8 in)10 June 1966
Jul85.3 mm (3.4 in)23 July 1967
Aug113.8 mm (4.5 in)28 August 1971
Sep109.0 mm (4.3 in)17 September 1999
Oct88.9 mm (3.5 in)20 October 1996
Nov71.6 mm (2.8 in)9 November 1972
Dec58.9 mm (2.3 in)21 December 1973

Latest Records

20
Latest records at Merriman Dam
DateStationRecordValueBeat old record byOld record stoodSignificance
18 February 2003Merriman Dam, USdaily rain32.0 mm (1.3 in)12.2 mm (0.5 in)4 years18 of 100 (Routine)
6 January 2003Merriman Dam, USdaily rain30.5 mm (1.2 in)19.6 mm (0.8 in)40 years37 of 100 (Notable)
2 January 2003Merriman Dam, USdaily rain23.4 mm (0.9 in)7.7 mm (0.30 in)24 years19 of 100 (Routine)
17 October 2002Merriman Dam, USdaily rain34.3 mm (1.4 in)11.4 mm (0.4 in)24 years20 of 100 (Routine)
12 October 2002Merriman Dam, USdaily rain52.6 mm (2.1 in)32.5 mm (1.3 in)11 years33 of 100 (Routine)
16 September 2002Merriman Dam, USdaily rain58.4 mm (2.3 in)33.8 mm (1.3 in)11 years31 of 100 (Routine)
20 August 2002Merriman Dam, USdaily rain25.9 mm (1.0 in)9.4 mm (0.37 in)11 years14 of 100 (Routine)
5 June 2002Merriman Dam, USdaily rain13.2 mm (0.5 in)7.9 mm (0.31 in)29 years17 of 100 (Routine)
14 May 2002Merriman Dam, USdaily rain32.8 mm (1.3 in)9.4 mm (0.37 in)31 years21 of 100 (Routine)
21 September 2001Merriman Dam, USdaily rain39.4 mm (1.6 in)13.2 mm (0.5 in)12 years16 of 100 (Routine)
1 September 2001Merriman Dam, USdaily rain21.1 mm (0.8 in)6.6 mm (0.26 in)14 years12 of 100 (Routine)
12 August 2001Merriman Dam, USdaily rain30.5 mm (1.2 in)3.3 mm (0.13 in)18 years11 of 100 (Routine)
2 June 2001Merriman Dam, USdaily rain38.4 mm (1.5 in)26.0 mm (1.0 in)19 years27 of 100 (Routine)
27 May 2001Merriman Dam, USdaily rain22.1 mm (0.9 in)6.4 mm (0.25 in)18 years14 of 100 (Routine)
23 May 2001Merriman Dam, USdaily rain30.0 mm (1.2 in)10.4 mm (0.4 in)18 years18 of 100 (Routine)
6 February 2001Merriman Dam, USdaily rain22.6 mm (0.9 in)14.5 mm (0.6 in)26 years20 of 100 (Routine)
31 December 2000Merriman Dam, USdaily rain25.1 mm (1.0 in)1.2 mm (0.05 in)29 years13 of 100 (Routine)
18 December 2000Merriman Dam, USdaily rain52.8 mm (2.1 in)35.0 mm (1.4 in)8 years40 of 100 (Notable)
16 July 2000Merriman Dam, USdaily rain68.1 mm (2.7 in)52.1 mm (2.1 in)8 years46 of 100 (Notable)
7 June 2000Merriman Dam, USdaily rain84.3 mm (3.3 in)60.4 mm (2.4 in)18 years49 of 100 (Notable)

Extremes by Year

1961 to 2003
Yearly extremes at Merriman Dam: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Wettest day (Rx1day)115.3 mm (4.5 in)198068.1 mm (2.7 in)43
Wettest five days (Rx5day)169.6 mm (6.7 in)1998100.4 mm (4.0 in)43
Longest dry spell (CDD)34 days198015 days43

Wettest day (Rx1day)

Wettest day (Rx1day) at Merriman Dam by year The wettest day of the year at Merriman Dam, 1961 to 2003. The record is 115.3 mm (4.5 in) in 1980, marked on the chart; the median year is 68.1 mm (2.7 in). 2550751001251970198019902000Record: 115.3 mm (4.5 in) in 1980
The wettest day of the year at Merriman Dam, 1961 to 2003. The record is 115.3 mm (4.5 in) in 1980, marked on the chart; the median year is 68.1 mm (2.7 in).
Wettest day (Rx1day) at Merriman Dam by year
YearWettest day (Rx1day)
196174.2 mm (2.9 in)
196244.5 mm (1.8 in)
196345.0 mm (1.8 in)
196446.5 mm (1.8 in)
196544.7 mm (1.8 in)
196695.8 mm (3.8 in)
196785.3 mm (3.4 in)
196854.6 mm (2.1 in)
196976.2 mm (3.0 in)
197056.4 mm (2.2 in)
1971113.8 mm (4.5 in)
197271.6 mm (2.8 in)
197377.5 mm (3.1 in)
197470.6 mm (2.8 in)
197570.9 mm (2.8 in)
197685.9 mm (3.4 in)
197776.2 mm (3.0 in)
197863.8 mm (2.5 in)
197983.8 mm (3.3 in)
1980115.3 mm (4.5 in)
198179.8 mm (3.1 in)
198261.2 mm (2.4 in)
198367.1 mm (2.6 in)
198465.5 mm (2.6 in)
198566.8 mm (2.6 in)
198688.9 mm (3.5 in)
1987101.6 mm (4.0 in)
198847.8 mm (1.9 in)
198974.2 mm (2.9 in)
199056.1 mm (2.2 in)
199141.4 mm (1.6 in)
199268.1 mm (2.7 in)
199354.6 mm (2.1 in)
199453.1 mm (2.1 in)
199572.1 mm (2.8 in)
199688.9 mm (3.5 in)
199754.9 mm (2.2 in)
199854.6 mm (2.1 in)
1999109.0 mm (4.3 in)
200084.3 mm (3.3 in)
200139.4 mm (1.6 in)
200258.4 mm (2.3 in)
200332.0 mm (1.3 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Merriman Dam by year The wettest five days of the year at Merriman Dam, 1961 to 2003. The record is 169.6 mm (6.7 in) in 1998, marked on the chart; the median year is 100.4 mm (4.0 in). 501001502001970198019902000Record: 169.6 mm (6.7 in) in 1998
The wettest five days of the year at Merriman Dam, 1961 to 2003. The record is 169.6 mm (6.7 in) in 1998, marked on the chart; the median year is 100.4 mm (4.0 in).
Wettest five days (Rx5day) at Merriman Dam by year
YearWettest five days (Rx5day)
196178.8 mm (3.1 in)
196265.8 mm (2.6 in)
196398.1 mm (3.9 in)
196453.2 mm (2.1 in)
196570.4 mm (2.8 in)
1966100.3 mm (3.9 in)
1967100.4 mm (4.0 in)
1968102.3 mm (4.0 in)
1969106.2 mm (4.2 in)
1970101.3 mm (4.0 in)
1971121.0 mm (4.8 in)
1972117.1 mm (4.6 in)
1973114.4 mm (4.5 in)
1974112.8 mm (4.4 in)
1975105.1 mm (4.1 in)
197697.0 mm (3.8 in)
1977107.4 mm (4.2 in)
197899.6 mm (3.9 in)
1979115.6 mm (4.6 in)
1980136.2 mm (5.4 in)
1981112.8 mm (4.4 in)
198274.5 mm (2.9 in)
1983124.4 mm (4.9 in)
1984140.4 mm (5.5 in)
198572.9 mm (2.9 in)
1986112.3 mm (4.4 in)
1987153.7 mm (6.1 in)
198879.2 mm (3.1 in)
1989126.1 mm (5.0 in)
199083.6 mm (3.3 in)
199175.4 mm (3.0 in)
199296.3 mm (3.8 in)
199379.2 mm (3.1 in)
199498.9 mm (3.9 in)
1995106.4 mm (4.2 in)
199699.3 mm (3.9 in)
199787.2 mm (3.4 in)
1998169.6 mm (6.7 in)
1999126.3 mm (5.0 in)
2000102.8 mm (4.0 in)
200175.7 mm (3.0 in)
200281.8 mm (3.2 in)
200364.8 mm (2.6 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Merriman Dam by year The longest dry spell of the year at Merriman Dam, 1961 to 2003. The record is 34 days in 1980, marked on the chart; the median year is 15 days. 102030401970198019902000Record: 34 days in 1980
The longest dry spell of the year at Merriman Dam, 1961 to 2003. The record is 34 days in 1980, marked on the chart; the median year is 15 days.
Longest dry spell (CDD) at Merriman Dam by year
YearLongest dry spell (CDD)
196115 days
196213 days
196327 days
196431 days
196511 days
196619 days
196714 days
196826 days
196917 days
197016 days
197114 days
197216 days
197315 days
197415 days
197514 days
197618 days
197715 days
197814 days
197915 days
198034 days
198125 days
198214 days
198311 days
198418 days
198514 days
198615 days
198718 days
198816 days
198912 days
199012 days
199123 days
199215 days
199312 days
199418 days
199512 days
199612 days
199714 days
199811 days
199928 days
200021 days
200126 days
200214 days
200331 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

36 years, 1962 to 2002

A day with at least 67.2 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 125.1 mm (4.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Merriman Dam: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years67.2 mm (2.6 in)
5 years85.3 mm (3.4 in)
10 years96.1 mm (3.8 in)
25 years108.7 mm (4.3 in)
50 years117.2 mm (4.6 in)Longer than the 36 years of record
100 years125.1 mm (4.9 in)Longer than the 36 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, 36 years of values from 1962 to 2002.

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: 115.3 mm (4.5 in) in 1980; 113.8 mm (4.5 in) in 1971; 101.6 mm (4.0 in) in 1987.

Download the Data

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