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Built 2026-10-18 (18 October 2026)

Sylvania Threshold Days by Year

4 fixed thresholds counted per year at Sylvania (ASN00007079): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Sylvania Thresholds

  • Sylvania: days with 10 mm (0.39 in) or more of precipitation in 33 years, most in 1999 with 17.
  • Sylvania: days with 25 mm (0.98 in) or more of precipitation in 29 years, most in 1999 with 8.
  • Sylvania: days with 50 mm (1.97 in) or more of precipitation in 15 years, most in 1999 with 3.
  • Sylvania: days with 100 mm (3.94 in) or more of precipitation in 5 years, most in 1971 with 1.
  • 4 fixed thresholds have at least one qualifying day at Sylvania.
33 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Sylvania Days per year at Sylvania with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 17 in 1999. 051015201950: 11968: 91969: 31970: 61971: 61972: 21973: 121974: 71975: 91977: 11978: 111979: 91980: 101981: 31982: 81983: 101984: 61985: 41986: 51987: 91988: 101989: 61990: 31991: 41992: 131993: 91994: 81996: 21997: 141998: 121999: 172000: 152001: 9195019711975198019841988199219972001
Days per year at Sylvania with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 17 in 1999.
Days with 10 mm (0.39 in) or more of precipitation per year at Sylvania
YearDaysDecade average
195011
196896
196936
197067
197167
197227
1973127
197477
197597
197717
1978117
197997
1980107.1
198137.1
198287.1
1983107.1
198467.1
198547.1
198657.1
198797.1
1988107.1
198967.1
199039.1
199149.1
1992139.1
199399.1
199489.1
199629.1
1997149.1
1998129.1
1999179.1
20001512
2001912
First to last qualifying date each year at Sylvania For each year, a bar from the first to the last day at Sylvania meeting 10 mm (0.39 in). 1950: 1 February 1950 to 1 February 19501968: 27 January 1968 to 23 August 19681969: 10 January 1969 to 28 May 19691970: 21 January 1970 to 10 September 19701971: 3 February 1971 to 4 June 19711972: 28 July 1972 to 29 July 19721973: 21 January 1973 to 28 December 19731974: 3 January 1974 to 25 December 19741975: 1 February 1975 to 9 December 19751977: 26 March 1977 to 26 March 19771978: 26 January 1978 to 14 November 19781979: 11 January 1979 to 21 May 19791980: 2 February 1980 to 26 December 19801981: 18 January 1981 to 7 July 19811982: 1 January 1982 to 15 September 19821983: 10 January 1983 to 25 December 19831984: 21 February 1984 to 4 December 19841985: 10 February 1985 to 31 December 19851986: 6 January 1986 to 29 September 19861987: 19 January 1987 to 1 May 19871988: 25 March 1988 to 27 December 19881989: 6 January 1989 to 13 June 19891990: 18 January 1990 to 28 January 19901991: 31 May 1991 to 20 June 19911992: 25 January 1992 to 28 December 19921993: 21 January 1993 to 14 August 19931994: 12 February 1994 to 22 December 19941996: 13 March 1996 to 23 December 19961997: 8 January 1997 to 11 May 19971998: 19 March 1998 to 16 December 19981999: 11 January 1999 to 14 December 19992000: 2 January 2000 to 13 December 20002001: 1 January 2001 to 20 March 20011950197219781983198819931999JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Sylvania meeting 10 mm (0.39 in).
First to last qualifying date each year at Sylvania
YearFirst dateLast date
19501950-02-011950-02-01
19681968-01-271968-08-23
19691969-01-101969-05-28
19701970-01-211970-09-10
19711971-02-031971-06-04
19721972-07-281972-07-29
19731973-01-211973-12-28
19741974-01-031974-12-25
19751975-02-011975-12-09
19771977-03-261977-03-26
19781978-01-261978-11-14
19791979-01-111979-05-21
19801980-02-021980-12-26
19811981-01-181981-07-07
19821982-01-011982-09-15
19831983-01-101983-12-25
19841984-02-211984-12-04
19851985-02-101985-12-31
19861986-01-061986-09-29
19871987-01-191987-05-01
19881988-03-251988-12-27
19891989-01-061989-06-13
19901990-01-181990-01-28
19911991-05-311991-06-20
19921992-01-251992-12-28
19931993-01-211993-08-14
19941994-02-121994-12-22
19961996-03-131996-12-23
19971997-01-081997-05-11
19981998-03-191998-12-16
19991999-01-111999-12-14
20002000-01-022000-12-13
20012001-01-012001-03-20

Every Fixed Threshold

Fixed thresholds at Sylvania
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain331719999
25 mm (0.98 in): Days with 25 mm or more rain29819993
50 mm (1.97 in): Days with 50 mm or more rain15319993
100 mm (3.94 in): Days with 100 mm or more rain5119711

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1950.

Download the Data

  • Data for Sylvania 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

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