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Built 2026-10-19 (19 October 2026)

Merrill 4 WSW Threshold Days by Year (USC00135418)

6 fixed thresholds counted per year at Merrill 4 WSW (USC00135418): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Merrill 4 WSW Thresholds

  • Merrill 4 WSW: days with 10 mm (0.39 in) or more of precipitation in 28 years, most in 1951 with 37.
  • Merrill 4 WSW: days with 25 mm (0.98 in) or more of precipitation in 28 years, most in 1953 with 10.
  • Merrill 4 WSW: days with 10 cm (3.9 in) or more of snowfall in 18 years, most in 1950 with 4.
  • Merrill 4 WSW: days with 50 mm (1.97 in) or more of precipitation in 17 years, most in 1950 with 3.
  • 6 fixed thresholds have at least one qualifying day at Merrill 4 WSW.
28 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Merrill 4 WSW Days per year at Merrill 4 WSW with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 37 in 1951. 0102030401949: 251950: 171951: 371952: 231953: 251954: 231955: 161956: 91957: 281958: 131959: 281960: 211961: 191962: 271964: 251965: 271966: 201967: 191968: 271969: 211970: 271971: 231972: 211973: 191974: 171975: 201976: 141977: 321949195219551958196119651968197119741977
Days per year at Merrill 4 WSW with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 37 in 1951.
Days with 10 mm (0.39 in) or more of precipitation per year at Merrill 4 WSW
YearDaysDecade average
19492525
19501721.9
19513721.9
19522321.9
19532521.9
19542321.9
19551621.9
1956921.9
19572821.9
19581321.9
19592821.9
19602122.9
19611922.9
19622722.9
19642522.9
19652722.9
19662022.9
19671922.9
19682722.9
19692122.9
19702721.6
19712321.6
19722121.6
19731921.6
19741721.6
19752021.6
19761421.6
19773221.6
First to last qualifying date each year at Merrill 4 WSW For each year, a bar from the first to the last day at Merrill 4 WSW meeting 10 mm (0.39 in). 1949: 4 January 1949 to 21 October 19491950: 8 March 1950 to 1 October 19501951: 26 February 1951 to 22 October 19511952: 19 January 1952 to 13 September 19521953: 19 February 1953 to 4 December 19531954: 19 February 1954 to 26 October 19541955: 3 April 1955 to 3 December 19551956: 3 April 1956 to 5 November 19561957: 15 March 1957 to 18 November 19571958: 26 February 1958 to 17 November 19581959: 10 February 1959 to 28 December 19591960: 1 April 1960 to 28 November 19601961: 17 February 1961 to 10 October 19611962: 15 February 1962 to 2 September 19621964: 19 March 1964 to 24 December 19641965: 9 February 1965 to 19 October 19651966: 9 February 1966 to 15 October 19661967: 10 May 1967 to 29 October 19671968: 3 April 1968 to 22 December 19681969: 28 January 1969 to 27 December 19691970: 3 March 1970 to 9 December 19701971: 18 February 1971 to 30 December 19711972: 21 April 1972 to 30 December 19721973: 22 January 1973 to 20 November 19731974: 11 March 1974 to 31 October 19741975: 11 January 1975 to 20 November 19751976: 12 March 1976 to 19 September 19761977: 3 March 1977 to 9 November 19771949195319571961196619701974JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Merrill 4 WSW meeting 10 mm (0.39 in).
First to last qualifying date each year at Merrill 4 WSW
YearFirst dateLast date
19491949-01-041949-10-21
19501950-03-081950-10-01
19511951-02-261951-10-22
19521952-01-191952-09-13
19531953-02-191953-12-04
19541954-02-191954-10-26
19551955-04-031955-12-03
19561956-04-031956-11-05
19571957-03-151957-11-18
19581958-02-261958-11-17
19591959-02-101959-12-28
19601960-04-011960-11-28
19611961-02-171961-10-10
19621962-02-151962-09-02
19641964-03-191964-12-24
19651965-02-091965-10-19
19661966-02-091966-10-15
19671967-05-101967-10-29
19681968-04-031968-12-22
19691969-01-281969-12-27
19701970-03-031970-12-09
19711971-02-181971-12-30
19721972-04-211972-12-30
19731973-01-221973-11-20
19741974-03-111974-10-31
19751975-01-111975-11-20
19761976-03-121976-09-19
19771977-03-031977-11-09

Every Fixed Threshold

Fixed thresholds at Merrill 4 WSW
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain2837195132
25 mm (0.98 in): Days with 25 mm or more rain281019537
50 mm (1.97 in): Days with 50 mm or more rain17319501
100 mm (3.94 in): Days with 100 mm or more rain3119491
10 cm (3.9 in): Days with 10 cm or more snowfall18419501
25 cm (9.8 in): Days with 25 cm or more snowfall1119591

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1949.

Download the Data

  • Data for Merrill 4 WSW 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).