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Built 2026-10-19 (19 October 2026)

Lock #4 Threshold Days by Year (USC00365101)

4 fixed thresholds counted per year at Lock #4 (USC00365101): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Lock #4 Thresholds

  • Lock #4: days with 10 mm (0.39 in) or more of precipitation in 36 years, most in 1921 with 44.
  • Lock #4: days with 25 mm (0.98 in) or more of precipitation in 36 years, most in 1929 with 11.
  • Lock #4: days with 50 mm (1.97 in) or more of precipitation in 16 years, most in 1901 with 3.
  • Lock #4: days with 100 mm (3.94 in) or more of precipitation in 1 years, most in 1920 with 1.
  • 4 fixed thresholds have at least one qualifying day at Lock #4.
36 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Lock #4 Days per year at Lock #4 with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 44 in 1921. 02040601893: 251894: 301895: 211896: 391897: 271898: 391899: 321900: 311901: 271902: 281903: 391904: 341905: 381906: 271907: 391908: 271909: 351910: 361911: 421912: 361913: 371914: 261915: 281916: 261917: 321918: 301919: 371920: 311921: 441922: 261923: 351925: 291926: 291927: 421928: 311929: 41189318971901190519091913191719211926
Days per year at Lock #4 with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 44 in 1921.
Days with 10 mm (0.39 in) or more of precipitation per year at Lock #4
YearDaysDecade average
18932530.4
18943030.4
18952130.4
18963930.4
18972730.4
18983930.4
18993230.4
19003132.5
19012732.5
19022832.5
19033932.5
19043432.5
19053832.5
19062732.5
19073932.5
19082732.5
19093532.5
19103633
19114233
19123633
19133733
19142633
19152833
19162633
19173233
19183033
19193733
19203134.2
19214434.2
19222634.2
19233534.2
19252934.2
19262934.2
19274234.2
19283134.2
19294134.2
First to last qualifying date each year at Lock #4 For each year, a bar from the first to the last day at Lock #4 meeting 10 mm (0.39 in). 1893: 10 January 1893 to 29 December 18931894: 25 January 1894 to 27 December 18941895: 6 January 1895 to 27 December 18951896: 24 January 1896 to 9 December 18961897: 6 February 1897 to 31 December 18971898: 1 January 1898 to 31 December 18981899: 7 January 1899 to 15 December 18991900: 12 January 1900 to 5 December 19001901: 27 March 1901 to 29 December 19011902: 22 January 1902 to 16 December 19021903: 3 January 1903 to 26 December 19031904: 21 January 1904 to 27 December 19041905: 7 January 1905 to 29 December 19051906: 4 January 1906 to 17 December 19061907: 4 January 1907 to 23 December 19071908: 8 January 1908 to 7 December 19081909: 17 January 1909 to 13 December 19091910: 6 January 1910 to 30 December 19101911: 13 January 1911 to 31 December 19111912: 19 January 1912 to 6 December 19121913: 3 January 1913 to 26 December 19131914: 3 January 1914 to 21 December 19141915: 7 January 1915 to 29 December 19151916: 2 January 1916 to 27 December 19161917: 3 January 1917 to 30 October 19171918: 15 January 1918 to 23 December 19181919: 2 January 1919 to 14 December 19191920: 9 January 1920 to 23 December 19201921: 8 January 1921 to 24 December 19211922: 5 January 1922 to 17 December 19221923: 1 January 1923 to 31 December 19231925: 20 January 1925 to 6 December 19251926: 19 January 1926 to 26 December 19261927: 20 January 1927 to 16 December 19271928: 20 January 1928 to 15 December 19281929: 23 January 1929 to 13 December 192918931898190319081913191819231929JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Lock #4 meeting 10 mm (0.39 in).
First to last qualifying date each year at Lock #4
YearFirst dateLast date
18931893-01-101893-12-29
18941894-01-251894-12-27
18951895-01-061895-12-27
18961896-01-241896-12-09
18971897-02-061897-12-31
18981898-01-011898-12-31
18991899-01-071899-12-15
19001900-01-121900-12-05
19011901-03-271901-12-29
19021902-01-221902-12-16
19031903-01-031903-12-26
19041904-01-211904-12-27
19051905-01-071905-12-29
19061906-01-041906-12-17
19071907-01-041907-12-23
19081908-01-081908-12-07
19091909-01-171909-12-13
19101910-01-061910-12-30
19111911-01-131911-12-31
19121912-01-191912-12-06
19131913-01-031913-12-26
19141914-01-031914-12-21
19151915-01-071915-12-29
19161916-01-021916-12-27
19171917-01-031917-10-30
19181918-01-151918-12-23
19191919-01-021919-12-14
19201920-01-091920-12-23
19211921-01-081921-12-24
19221922-01-051922-12-17
19231923-01-011923-12-31
19251925-01-201925-12-06
19261926-01-191926-12-26
19271927-01-201927-12-16
19281928-01-201928-12-15
19291929-01-231929-12-13

Every Fixed Threshold

Fixed thresholds at Lock #4
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3644192141
25 mm (0.98 in): Days with 25 mm or more rain3611192911
50 mm (1.97 in): Days with 50 mm or more rain16319011
100 mm (3.94 in): Days with 100 mm or more rain1119201

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1893.

Download the Data

  • 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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

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