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Built 2026-10-15 (15 October 2026)

Tappan Dam Weather Records (USC00338240)

Record envelope, standing records and threshold days for Tappan Dam (USC00338240), Ohio, United States, with 39 years of record.

Key Facts for Tappan Dam

  • Tappan Dam (USC00338240) is a weather station in Ohio, United States at 40.36 latitude and -81.23 longitude, 290 m (950 ft) above sea level.
  • The station reports from 1949 to 1987, 39 years of record.
  • 0 records set at Tappan Dam still stand.
  • Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Tappan Dam set a daily record precipitation of 19.1 mm (0.8 in) on 27 August 1987.

About the Station

  • Location: Ohio, United States, 40.36 latitude, -81.23 longitude.
  • Elevation: 290 m (950 ft).
  • Period of record: 1949 to 1987, 39 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 Tappan Dam, with 2026 drawn through them The band shows the record high and record low for each calendar day at Tappan 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 Tappan 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 Tappan 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 Tappan Dam by the year they were set 0 records at Tappan Dam still stand. 00000000000
0 records at Tappan Dam still stand.
Standing records at Tappan Dam by the year they were set
Year setStanding records

All-Time Record Progression

2 new records
When Tappan Dam set new all-time records 2 all-time records were set at Tappan Dam between 28 July 1980 and 4 September 1981. Each dot is a new record. Record daily precipitation28 July 1980: Record daily precipitation 104.4 mm (4.1 in)4 September 1981: Record daily precipitation 127.8 mm (5.0 in)1980
2 all-time records were set at Tappan Dam between 28 July 1980 and 4 September 1981. Each dot is a new record.
When Tappan Dam set new all-time records
DateKindDetail
1980-07-28Record daily precipitationRecord daily precipitation 104.4 mm (4.1 in)
1981-09-04Record daily precipitationRecord daily precipitation 127.8 mm (5.0 in)

Wettest Day of Each Month

Sep: 127.8 mm (5.0 in)
Record daily precipitation for each month at Tappan Dam The wettest day on record for each calendar month at Tappan Dam. The most was 127.8 mm (5.0 in) on 4 September 1981. 050100150 Jan: 70.1 mm (2.8 in), 27 January 1952 Jan Feb: 54.1 mm (2.1 in), 24 February 1975 Feb Mar: 63.5 mm (2.5 in), 10 March 1964 Mar Apr: 56.4 mm (2.2 in), 24 April 1970 Apr May: 80.5 mm (3.2 in), 6 May 1971 May Jun: 72.9 mm (2.9 in), 16 June 1970 Jun Jul: 104.4 mm (4.1 in), 28 July 1980 Jul Aug: 63.5 mm (2.5 in), 16 August 1952 Aug Sep: 127.8 mm (5.0 in), 4 September 1981 Sep Oct: 59.9 mm (2.4 in), 16 October 1954 Oct Nov: 67.3 mm (2.6 in), 5 November 1985 Nov Dec: 43.7 mm (1.7 in), 9 December 1978 Dec
The wettest day on record for each calendar month at Tappan Dam. The most was 127.8 mm (5.0 in) on 4 September 1981.
Record daily precipitation for each month at Tappan Dam
MonthRecord daily precipitation (mm)Date
Jan70.1 mm (2.8 in)27 January 1952
Feb54.1 mm (2.1 in)24 February 1975
Mar63.5 mm (2.5 in)10 March 1964
Apr56.4 mm (2.2 in)24 April 1970
May80.5 mm (3.2 in)6 May 1971
Jun72.9 mm (2.9 in)16 June 1970
Jul104.4 mm (4.1 in)28 July 1980
Aug63.5 mm (2.5 in)16 August 1952
Sep127.8 mm (5.0 in)4 September 1981
Oct59.9 mm (2.4 in)16 October 1954
Nov67.3 mm (2.6 in)5 November 1985
Dec43.7 mm (1.7 in)9 December 1978

Latest Records

20
Latest records at Tappan Dam
DateStationRecordValueBeat old record byOld record stoodSignificance
27 August 1987Tappan Dam, USdaily rain19.1 mm (0.8 in)1.8 mm (0.07 in)8 years6 of 100 (Routine)
23 August 1987Tappan Dam, USdaily rain58.4 mm (2.3 in)28.9 mm (1.1 in)8 years30 of 100 (Routine)
19 May 1987Tappan Dam, USdaily rain29.2 mm (1.1 in)18.5 mm (0.7 in)9 years27 of 100 (Routine)
7 April 1987Tappan Dam, USdaily snow depth (Tie)2.5 cm (1.0 in)tie34 years3 of 100 (Routine)
6 April 1987Tappan Dam, USdaily snow depth10.2 cm (4.0 in)10.2 cm (4.0 in)36 years24 of 100 (Routine)
5 April 1987Tappan Dam, USdaily snow depth20.3 cm (8.0 in)20.3 cm (8.0 in)36 years34 of 100 (Routine)
4 April 1987Tappan Dam, USmonthly snowfall27.9 cm (11.0 in)12.7 cm (5.0 in)4 years39 of 100 (Notable)
4 April 1987Tappan Dam, USmonthly snow depth27.9 cm (11.0 in)12.7 cm (5.0 in)4 years26 of 100 (Routine)
4 April 1987Tappan Dam, USdaily rain (Tie)26.7 mm (1.1 in)tie29 years2 of 100 (Routine)
31 March 1987Tappan Dam, USdaily rain39.4 mm (1.6 in)13.2 mm (0.5 in)24 years27 of 100 (Routine)
31 March 1987Tappan Dam, USdaily snowfall7.6 cm (3.0 in)5.1 cm (2.0 in)22 years20 of 100 (Routine)
2 January 1987Tappan Dam, USdaily snowfall12.7 cm (5.0 in)3.8 cm (1.5 in)23 years18 of 100 (Routine)
10 December 1986Tappan Dam, USdaily rain8.6 mm (0.34 in)1.2 mm (0.05 in)33 years14 of 100 (Routine)
2 December 1986Tappan Dam, USdaily rain36.6 mm (1.4 in)13.0 mm (0.5 in)12 years26 of 100 (Routine)
21 November 1986Tappan Dam, USdaily rain14.7 mm (0.6 in)2.0 mm (0.08 in)4 years6 of 100 (Routine)
4 October 1986Tappan Dam, USdaily rain20.3 mm (0.8 in)3.8 mm (0.15 in)29 years15 of 100 (Routine)
2 October 1986Tappan Dam, USdaily rain26.2 mm (1.0 in)6.9 mm (0.27 in)16 years17 of 100 (Routine)
25 September 1986Tappan Dam, USdaily rain38.4 mm (1.5 in)30.8 mm (1.2 in)13 years31 of 100 (Routine)
19 September 1986Tappan Dam, USdaily rain29.0 mm (1.1 in)4.4 mm (0.17 in)8 years8 of 100 (Routine)
17 July 1986Tappan Dam, USdaily rain30.7 mm (1.2 in)14.2 mm (0.6 in)23 years20 of 100 (Routine)

Extremes by Year

1949 to 1987
Yearly extremes at Tappan Dam: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Wettest day (Rx1day)127.8 mm (5.0 in)198153.8 mm (2.1 in)39
Wettest five days (Rx5day)207.3 mm (8.2 in)198185.7 mm (3.4 in)39
Longest dry spell (CDD)46 days196315 days39

Wettest day (Rx1day)

Wettest day (Rx1day) at Tappan Dam by year The wettest day of the year at Tappan Dam, 1949 to 1987. The record is 127.8 mm (5.0 in) in 1981, marked on the chart; the median year is 53.8 mm (2.1 in). 2550751001251501950196019701980Record: 127.8 mm (5.0 in) in 1981
The wettest day of the year at Tappan Dam, 1949 to 1987. The record is 127.8 mm (5.0 in) in 1981, marked on the chart; the median year is 53.8 mm (2.1 in).
Wettest day (Rx1day) at Tappan Dam by year
YearWettest day (Rx1day)
194941.4 mm (1.6 in)
195076.2 mm (3.0 in)
195149.5 mm (1.9 in)
195270.1 mm (2.8 in)
195332.5 mm (1.3 in)
195459.9 mm (2.4 in)
195540.1 mm (1.6 in)
195645.5 mm (1.8 in)
195752.1 mm (2.1 in)
195865.3 mm (2.6 in)
195957.2 mm (2.3 in)
196055.1 mm (2.2 in)
196147.2 mm (1.9 in)
196267.3 mm (2.6 in)
196361.5 mm (2.4 in)
196463.5 mm (2.5 in)
196572.9 mm (2.9 in)
196634.3 mm (1.4 in)
196729.2 mm (1.1 in)
196848.8 mm (1.9 in)
196963.5 mm (2.5 in)
197072.9 mm (2.9 in)
197180.5 mm (3.2 in)
197247.8 mm (1.9 in)
197334.5 mm (1.4 in)
197435.1 mm (1.4 in)
197554.1 mm (2.1 in)
197669.3 mm (2.7 in)
197748.0 mm (1.9 in)
197849.8 mm (2.0 in)
197952.8 mm (2.1 in)
1980104.4 mm (4.1 in)
1981127.8 mm (5.0 in)
198231.0 mm (1.2 in)
198353.8 mm (2.1 in)
198441.9 mm (1.6 in)
198567.3 mm (2.6 in)
198652.6 mm (2.1 in)
198758.4 mm (2.3 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Tappan Dam by year The wettest five days of the year at Tappan Dam, 1949 to 1987. The record is 207.3 mm (8.2 in) in 1981, marked on the chart; the median year is 85.7 mm (3.4 in). 0501001502002501950196019701980Record: 207.3 mm (8.2 in) in 1981
The wettest five days of the year at Tappan Dam, 1949 to 1987. The record is 207.3 mm (8.2 in) in 1981, marked on the chart; the median year is 85.7 mm (3.4 in).
Wettest five days (Rx5day) at Tappan Dam by year
YearWettest five days (Rx5day)
194968.8 mm (2.7 in)
1950109.2 mm (4.3 in)
195157.2 mm (2.3 in)
1952106.4 mm (4.2 in)
195338.6 mm (1.5 in)
195477.5 mm (3.1 in)
195569.3 mm (2.7 in)
195668.3 mm (2.7 in)
195773.7 mm (2.9 in)
195885.7 mm (3.4 in)
195979.5 mm (3.1 in)
196083.9 mm (3.3 in)
196187.6 mm (3.4 in)
196287.7 mm (3.5 in)
196390.7 mm (3.6 in)
1964102.1 mm (4.0 in)
196587.6 mm (3.4 in)
196659.9 mm (2.4 in)
196765.6 mm (2.6 in)
196864.9 mm (2.6 in)
1969114.9 mm (4.5 in)
1970116.1 mm (4.6 in)
197190.7 mm (3.6 in)
197253.4 mm (2.1 in)
197368.4 mm (2.7 in)
197489.8 mm (3.5 in)
197585.8 mm (3.4 in)
1976161.2 mm (6.3 in)
197774.2 mm (2.9 in)
197880.5 mm (3.2 in)
1979123.3 mm (4.9 in)
1980107.0 mm (4.2 in)
1981207.3 mm (8.2 in)
198255.6 mm (2.2 in)
198389.5 mm (3.5 in)
198481.5 mm (3.2 in)
1985105.2 mm (4.1 in)
198692.5 mm (3.6 in)
198778.3 mm (3.1 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Tappan Dam by year The longest dry spell of the year at Tappan Dam, 1949 to 1987. The record is 46 days in 1963, marked on the chart; the median year is 15 days. 010203040501950196019701980Record: 46 days in 1963
The longest dry spell of the year at Tappan Dam, 1949 to 1987. The record is 46 days in 1963, marked on the chart; the median year is 15 days.
Longest dry spell (CDD) at Tappan Dam by year
YearLongest dry spell (CDD)
194912 days
195012 days
195115 days
195226 days
195322 days
195414 days
195531 days
195613 days
195713 days
195812 days
195915 days
19609 days
196111 days
196213 days
196346 days
196413 days
196513 days
196617 days
196725 days
196814 days
196935 days
197015 days
197114 days
197211 days
197315 days
197413 days
197515 days
197620 days
197719 days
197817 days
197915 days
198011 days
198116 days
198217 days
198312 days
198415 days
198523 days
198610 days
198717 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

37 years, 1950 to 1986

A day with at least 53.8 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 119.3 mm (4.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Tappan Dam: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years53.8 mm (2.1 in)
5 years70.9 mm (2.8 in)
10 years82.4 mm (3.2 in)
25 years97.1 mm (3.8 in)
50 years108.2 mm (4.3 in)Longer than the 37 years of record
100 years119.3 mm (4.7 in)Longer than the 37 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, 37 years of values from 1950 to 1986.

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: 127.8 mm (5.0 in) in 1981; 104.4 mm (4.1 in) in 1980; 80.5 mm (3.2 in) in 1971.

Download the Data

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