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Data as of 2025-12-31
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Built 2026-10-17 (17 October 2026)

Lock #4 Weather Records (USC00365101)

Record envelope, standing records and threshold days for Lock #4 (USC00365101), Pennsylvania, United States, with 46 years of record.

Key Facts for Lock #4

  • Lock #4 (USC00365101) is a weather station in Pennsylvania, United States at 40.15 latitude and -79.90 longitude, 232 m (760 ft) above sea level.
  • The station reports from 1885 to 1930, 46 years of record.
  • 0 records set at Lock #4 still stand.
  • Records are tracked for prcp: an element needs 30 years of data to be eligible.
  • Lock #4 set a daily record precipitation of 30.5 mm (1.2 in) on 25 June 1930.

About the Station

  • Location: Pennsylvania, United States, 40.15 latitude, -79.90 longitude.
  • Elevation: 232 m (760 ft).
  • Period of record: 1885 to 1930, 46 years.
  • Eligible elements: prcp.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Lock #4, with 2026 drawn through them The band shows the record high and record low for each calendar day at Lock #4. 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 Lock #4. 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 Lock #4, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jann/an/an/an/a
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Marn/an/an/an/a
Aprn/an/an/an/a
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Juln/an/an/an/a
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Novn/an/an/an/a
Decn/an/an/an/a

Which Years Hold Standing Records

0 standing records
Standing records at Lock #4 by the year they were set 0 records at Lock #4 still stand. 00000000000
0 records at Lock #4 still stand.
Standing records at Lock #4 by the year they were set
Year setStanding records

All-Time Record Progression

1 new records
When Lock #4 set new all-time records 1 all-time records were set at Lock #4 between 17 June 1920 and 17 June 1920. Each dot is a new record. Record daily precipitation17 June 1920: Record daily precipitation 100.3 mm (3.9 in)1920
1 all-time records were set at Lock #4 between 17 June 1920 and 17 June 1920. Each dot is a new record.
When Lock #4 set new all-time records
DateKindDetail
1920-06-17Record daily precipitationRecord daily precipitation 100.3 mm (3.9 in)

Wettest Day of Each Month

Jun: 100.3 mm (3.9 in)
Record daily precipitation for each month at Lock #4 The wettest day on record for each calendar month at Lock #4. The most was 100.3 mm (3.9 in) on 17 June 1920. 050100150 Jan: 42.4 mm (1.7 in), 7 January 1930 Jan Feb: 57.2 mm (2.3 in), 24 February 1909 Feb Mar: 61.5 mm (2.4 in), 19 March 1908 Mar Apr: 63.5 mm (2.5 in), 3 April 1901 Apr May: 50.8 mm (2.0 in), 28 May 1906 May Jun: 100.3 mm (3.9 in), 17 June 1920 Jun Jul: 81.3 mm (3.2 in), 8 July 1891 Jul Aug: 83.3 mm (3.3 in), 22 August 1888 Aug Sep: 56.9 mm (2.2 in), 30 September 1896 Sep Oct: 57.9 mm (2.3 in), 3 October 1929 Oct Nov: 48.3 mm (1.9 in), 16 November 1926 Nov Dec: 60.7 mm (2.4 in), 16 December 1901 Dec
The wettest day on record for each calendar month at Lock #4. The most was 100.3 mm (3.9 in) on 17 June 1920.
Record daily precipitation for each month at Lock #4
MonthRecord daily precipitation (mm)Date
Jan42.4 mm (1.7 in)7 January 1930
Feb57.2 mm (2.3 in)24 February 1909
Mar61.5 mm (2.4 in)19 March 1908
Apr63.5 mm (2.5 in)3 April 1901
May50.8 mm (2.0 in)28 May 1906
Jun100.3 mm (3.9 in)17 June 1920
Jul81.3 mm (3.2 in)8 July 1891
Aug83.3 mm (3.3 in)22 August 1888
Sep56.9 mm (2.2 in)30 September 1896
Oct57.9 mm (2.3 in)3 October 1929
Nov48.3 mm (1.9 in)16 November 1926
Dec60.7 mm (2.4 in)16 December 1901

Latest Records

20
Latest records at Lock #4
DateStationRecordValueBeat old record byOld record stoodSignificance
25 June 1930Lock #4, USdaily rain30.5 mm (1.2 in)12.5 mm (0.5 in)4 years17 of 100 (Routine)
10 June 1930Lock #4, USdaily rain26.7 mm (1.1 in)11.5 mm (0.5 in)33 years25 of 100 (Routine)
22 April 1930Lock #4, USdaily rain22.9 mm (0.9 in)1.1 mm (0.04 in)20 years11 of 100 (Routine)
16 March 1930Lock #4, USdaily rain42.4 mm (1.7 in)26.7 mm (1.1 in)35 years50 of 100 (Notable)
20 February 1930Lock #4, USdaily rain42.4 mm (1.7 in)14.0 mm (0.6 in)6 years25 of 100 (Routine)
7 January 1930Lock #4, USmonthly rain42.4 mm (1.7 in)6.8 mm (0.27 in)42 years36 of 100 (Notable)
19 December 1929Lock #4, USdaily rain4.3 mm (0.17 in)0.5 mm (0.02 in)14 years8 of 100 (Routine)
18 November 1929Lock #4, USdaily rain34.3 mm (1.4 in)7.6 mm (0.30 in)39 years25 of 100 (Routine)
23 October 1929Lock #4, USdaily rain29.5 mm (1.2 in)14.8 mm (0.6 in)38 years31 of 100 (Routine)
3 October 1929Lock #4, USmonthly rain57.9 mm (2.3 in)6.1 mm (0.24 in)41 years32 of 100 (Routine)
2 October 1929Lock #4, USdaily rain24.9 mm (1.0 in)0.8 mm (0.03 in)40 years16 of 100 (Routine)
24 August 1929Lock #4, USdaily rain39.4 mm (1.6 in)20.3 mm (0.8 in)22 years28 of 100 (Routine)
4 August 1929Lock #4, USdaily rain32.0 mm (1.3 in)4.1 mm (0.16 in)18 years12 of 100 (Routine)
29 May 1929Lock #4, USdaily rain34.8 mm (1.4 in)1.0 mm (0.04 in)37 years16 of 100 (Routine)
17 April 1929Lock #4, USdaily rain23.4 mm (0.9 in)12.0 mm (0.5 in)8 years20 of 100 (Routine)
16 April 1929Lock #4, USdaily rain18.0 mm (0.7 in)1.5 mm (0.06 in)15 years10 of 100 (Routine)
10 April 1929Lock #4, USdaily rain16.5 mm (0.6 in)2.5 mm (0.10 in)23 years13 of 100 (Routine)
5 April 1929Lock #4, USdaily rain25.4 mm (1.0 in)15.5 mm (0.6 in)31 years33 of 100 (Routine)
6 March 1929Lock #4, USdaily rain26.7 mm (1.1 in)1.3 mm (0.05 in)38 years16 of 100 (Routine)
1 December 1928Lock #4, USdaily rain11.7 mm (0.5 in)2.0 mm (0.08 in)41 years18 of 100 (Routine)

Extremes by Year

1885 to 1930
Yearly extremes at Lock #4: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Wettest day (Rx1day)100.3 mm (3.9 in)192048.3 mm (1.9 in)46
Wettest five days (Rx5day)148.8 mm (5.9 in)192074.1 mm (2.9 in)45
Longest dry spell (CDD)27 days190315 days45

Wettest day (Rx1day)

Wettest day (Rx1day) at Lock #4 by year The wettest day of the year at Lock #4, 1885 to 1930. The record is 100.3 mm (3.9 in) in 1920, marked on the chart; the median year is 48.3 mm (1.9 in). 025507510012518901900191019201930Record: 100.3 mm (3.9 in) in 1920
The wettest day of the year at Lock #4, 1885 to 1930. The record is 100.3 mm (3.9 in) in 1920, marked on the chart; the median year is 48.3 mm (1.9 in).
Wettest day (Rx1day) at Lock #4 by year
YearWettest day (Rx1day)
18855.1 mm (0.20 in)
188652.3 mm (2.1 in)
188755.4 mm (2.2 in)
188883.3 mm (3.3 in)
188948.3 mm (1.9 in)
189057.4 mm (2.3 in)
189181.3 mm (3.2 in)
189266.0 mm (2.6 in)
189346.7 mm (1.8 in)
189436.1 mm (1.4 in)
189530.7 mm (1.2 in)
189675.7 mm (3.0 in)
189730.0 mm (1.2 in)
189860.2 mm (2.4 in)
189955.9 mm (2.2 in)
190041.9 mm (1.6 in)
190163.5 mm (2.5 in)
190250.8 mm (2.0 in)
190355.1 mm (2.2 in)
190435.6 mm (1.4 in)
190551.3 mm (2.0 in)
190650.8 mm (2.0 in)
190755.9 mm (2.2 in)
190861.5 mm (2.4 in)
190959.7 mm (2.4 in)
191037.6 mm (1.5 in)
191139.1 mm (1.5 in)
191255.9 mm (2.2 in)
191338.1 mm (1.5 in)
191431.8 mm (1.3 in)
191542.4 mm (1.7 in)
191627.7 mm (1.1 in)
191738.9 mm (1.5 in)
191865.5 mm (2.6 in)
191977.5 mm (3.1 in)
1920100.3 mm (3.9 in)
192141.9 mm (1.6 in)
192242.4 mm (1.7 in)
192333.5 mm (1.3 in)
192439.6 mm (1.6 in)
192537.3 mm (1.5 in)
192648.3 mm (1.9 in)
192738.1 mm (1.5 in)
192842.2 mm (1.7 in)
192957.9 mm (2.3 in)
193042.4 mm (1.7 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Lock #4 by year The wettest five days of the year at Lock #4, 1885 to 1930. The record is 148.8 mm (5.9 in) in 1920, marked on the chart; the median year is 74.1 mm (2.9 in). 05010015018901900191019201930Record: 148.8 mm (5.9 in) in 1920
The wettest five days of the year at Lock #4, 1885 to 1930. The record is 148.8 mm (5.9 in) in 1920, marked on the chart; the median year is 74.1 mm (2.9 in).
Wettest five days (Rx5day) at Lock #4 by year
YearWettest five days (Rx5day)
1885n/a
188669.6 mm (2.7 in)
188799.1 mm (3.9 in)
188858.2 mm (2.3 in)
188977.5 mm (3.1 in)
189070.6 mm (2.8 in)
189145.8 mm (1.8 in)
189281.5 mm (3.2 in)
189353.4 mm (2.1 in)
189462.7 mm (2.5 in)
189548.7 mm (1.9 in)
1896117.9 mm (4.6 in)
189751.3 mm (2.0 in)
189888.1 mm (3.5 in)
189975.0 mm (3.0 in)
190074.1 mm (2.9 in)
190198.3 mm (3.9 in)
190275.4 mm (3.0 in)
190399.1 mm (3.9 in)
190472.7 mm (2.9 in)
190599.4 mm (3.9 in)
190682.8 mm (3.3 in)
1907114.7 mm (4.5 in)
190872.4 mm (2.9 in)
190982.1 mm (3.2 in)
191053.3 mm (2.1 in)
191192.1 mm (3.6 in)
1912115.8 mm (4.6 in)
191362.2 mm (2.4 in)
191469.1 mm (2.7 in)
191570.0 mm (2.8 in)
191642.9 mm (1.7 in)
191754.9 mm (2.2 in)
191894.5 mm (3.7 in)
1919106.2 mm (4.2 in)
1920148.8 mm (5.9 in)
192192.9 mm (3.7 in)
192266.6 mm (2.6 in)
192350.3 mm (2.0 in)
192460.8 mm (2.4 in)
192555.4 mm (2.2 in)
192690.7 mm (3.6 in)
192785.8 mm (3.4 in)
192870.7 mm (2.8 in)
1929104.7 mm (4.1 in)
193046.5 mm (1.8 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Lock #4 by year The longest dry spell of the year at Lock #4, 1885 to 1930. The record is 27 days in 1903, marked on the chart; the median year is 15 days. 010203018901900191019201930Record: 27 days in 1903
The longest dry spell of the year at Lock #4, 1885 to 1930. The record is 27 days in 1903, marked on the chart; the median year is 15 days.
Longest dry spell (CDD) at Lock #4 by year
YearLongest dry spell (CDD)
1885n/a
188615 days
188711 days
18887 days
18899 days
18904 days
18912 days
189211 days
189314 days
189418 days
189514 days
189615 days
189718 days
189815 days
189914 days
190015 days
190116 days
190219 days
190327 days
190421 days
190512 days
190617 days
190710 days
190821 days
190913 days
191014 days
191127 days
191216 days
191316 days
191416 days
191510 days
191610 days
191723 days
191818 days
191914 days
192014 days
192116 days
192224 days
192323 days
192426 days
192513 days
192613 days
192713 days
192813 days
192915 days
193012 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, 1893 to 1929

A day with at least 45.8 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 101.8 mm (4.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Lock #4: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years45.8 mm (1.8 in)
5 years59.4 mm (2.3 in)
10 years68.9 mm (2.7 in)
25 years81.6 mm (3.2 in)
50 years91.5 mm (3.6 in)Longer than the 36 years of record
100 years101.8 mm (4.0 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 1893 to 1929.

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: 100.3 mm (3.9 in) in 1920; 77.5 mm (3.1 in) in 1919; 75.7 mm (3.0 in) in 1896.

Download the Data

  • Data for Lock #4 standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Lock #4 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2025-12-31).