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Built 2026-10-17 (17 October 2026)

Byllesby 1 S Weather Records (USC00441259)

Record envelope, standing records and threshold days for Byllesby 1 S (USC00441259), Virginia, United States, with 39 years of record.

Key Facts for Byllesby 1 S

  • Byllesby 1 S (USC00441259) is a weather station in Virginia, United States at 36.77 latitude and -80.94 longitude, 797 m (2,615 ft) above sea level.
  • The station reports from 1967 to 2005, 39 years of record.
  • 0 records set at Byllesby 1 S still stand.
  • Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Byllesby 1 S set a daily record precipitation of 20.1 mm (0.8 in) on 31 August 2005.

About the Station

  • Location: Virginia, United States, 36.77 latitude, -80.94 longitude.
  • Elevation: 797 m (2,615 ft).
  • Period of record: 1967 to 2005, 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 Byllesby 1 S, with 2026 drawn through them The band shows the record high and record low for each calendar day at Byllesby 1 S. 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 Byllesby 1 S. 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 Byllesby 1 S, 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 Byllesby 1 S by the year they were set 0 records at Byllesby 1 S still stand. 00000000000
0 records at Byllesby 1 S still stand.
Standing records at Byllesby 1 S by the year they were set
Year setStanding records

All-Time Record Progression

1 new records
When Byllesby 1 S set new all-time records 1 all-time records were set at Byllesby 1 S between 29 September 2004 and 29 September 2004. Each dot is a new record. Record daily precipitation29 September 2004: Record daily precipitation 158.8 mm (6.3 in)2005
1 all-time records were set at Byllesby 1 S between 29 September 2004 and 29 September 2004. Each dot is a new record.
When Byllesby 1 S set new all-time records
DateKindDetail
2004-09-29Record daily precipitationRecord daily precipitation 158.8 mm (6.3 in)

Wettest Day of Each Month

Sep: 158.8 mm (6.3 in)
Record daily precipitation for each month at Byllesby 1 S The wettest day on record for each calendar month at Byllesby 1 S. The most was 158.8 mm (6.3 in) on 29 September 2004. 050100150200 Jan: 74.2 mm (2.9 in), 15 January 1995 Jan Feb: 61.0 mm (2.4 in), 14 February 1984 Feb Mar: 81.3 mm (3.2 in), 1 March 2003 Mar Apr: 60.2 mm (2.4 in), 27 April 1973 Apr May: 78.7 mm (3.1 in), 28 May 1973 May Jun: 110.2 mm (4.3 in), 17 June 1976 Jun Jul: 107.7 mm (4.2 in), 5 July 1989 Jul Aug: 90.2 mm (3.6 in), 18 August 1985 Aug Sep: 158.8 mm (6.3 in), 29 September 2004 Sep Oct: 68.1 mm (2.7 in), 24 October 1971 Oct Nov: 72.9 mm (2.9 in), 16 November 1989 Nov Dec: 71.1 mm (2.8 in), 5 December 1993 Dec
The wettest day on record for each calendar month at Byllesby 1 S. The most was 158.8 mm (6.3 in) on 29 September 2004.
Record daily precipitation for each month at Byllesby 1 S
MonthRecord daily precipitation (mm)Date
Jan74.2 mm (2.9 in)15 January 1995
Feb61.0 mm (2.4 in)14 February 1984
Mar81.3 mm (3.2 in)1 March 2003
Apr60.2 mm (2.4 in)27 April 1973
May78.7 mm (3.1 in)28 May 1973
Jun110.2 mm (4.3 in)17 June 1976
Jul107.7 mm (4.2 in)5 July 1989
Aug90.2 mm (3.6 in)18 August 1985
Sep158.8 mm (6.3 in)29 September 2004
Oct68.1 mm (2.7 in)24 October 1971
Nov72.9 mm (2.9 in)16 November 1989
Dec71.1 mm (2.8 in)5 December 1993

Latest Records

20
Latest records at Byllesby 1 S
DateStationRecordValueBeat old record byOld record stoodSignificance
31 August 2005Byllesby 1 S, USdaily rain20.1 mm (0.8 in)4.6 mm (0.18 in)23 years12 of 100 (Routine)
3 August 2005Byllesby 1 S, USdaily rain25.9 mm (1.0 in)4.1 mm (0.16 in)11 years9 of 100 (Routine)
31 July 2005Byllesby 1 S, USdaily rain30.2 mm (1.2 in)8.9 mm (0.35 in)32 years18 of 100 (Routine)
17 July 2005Byllesby 1 S, USdaily rain (Tie)20.3 mm (0.8 in)tie32 years3 of 100 (Routine)
7 July 2005Byllesby 1 S, USdaily rain38.9 mm (1.5 in)26.7 mm (1.1 in)34 years33 of 100 (Routine)
30 June 2005Byllesby 1 S, USdaily rain13.0 mm (0.5 in)9.4 mm (0.37 in)26 years16 of 100 (Routine)
2 April 2005Byllesby 1 S, USdaily rain20.8 mm (0.8 in)1.0 mm (0.04 in)35 years13 of 100 (Routine)
12 March 2005Byllesby 1 S, USdaily snow depth2.5 cm (1.0 in)2.5 cm (1.0 in)36 years17 of 100 (Routine)
12 March 2005Byllesby 1 S, USdaily snowfall2.5 cm (1.0 in)1.2 cm (0.5 in)18 years10 of 100 (Routine)
28 February 2005Byllesby 1 S, USdaily snowfall15.5 cm (6.1 in)6.1 cm (2.4 in)23 years17 of 100 (Routine)
20 January 2005Byllesby 1 S, USdaily snowfall2.5 cm (1.0 in)1.7 cm (0.7 in)26 years12 of 100 (Routine)
29 November 2004Byllesby 1 S, USdaily rain31.8 mm (1.3 in)2.8 mm (0.11 in)17 years10 of 100 (Routine)
15 November 2004Byllesby 1 S, USdaily rain28.4 mm (1.1 in)18.0 mm (0.7 in)21 years24 of 100 (Routine)
1 November 2004Byllesby 1 S, USdaily rain30.5 mm (1.2 in)18.6 mm (0.7 in)31 years28 of 100 (Routine)
29 September 2004Byllesby 1 S, USall-time rain158.8 mm (6.3 in)48.6 mm (1.9 in)28 years68 of 100 (Major)
18 September 2004Byllesby 1 S, USmonthly rain106.9 mm (4.2 in)5.3 mm (0.21 in)0 years17 of 100 (Routine)
9 September 2004Byllesby 1 S, USmonthly rain101.6 mm (4.0 in)16.5 mm (0.6 in)10 years28 of 100 (Routine)
19 July 2004Byllesby 1 S, USdaily rain21.3 mm (0.8 in)14.4 mm (0.6 in)29 years20 of 100 (Routine)
12 July 2004Byllesby 1 S, USdaily rain35.6 mm (1.4 in)8.9 mm (0.35 in)31 years18 of 100 (Routine)
2 June 2004Byllesby 1 S, USdaily rain36.1 mm (1.4 in)15.3 mm (0.6 in)35 years24 of 100 (Routine)

Extremes by Year

1967 to 2005
Yearly extremes at Byllesby 1 S: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Wettest day (Rx1day)158.8 mm (6.3 in)200460.5 mm (2.4 in)39
Wettest five days (Rx5day)187.9 mm (7.4 in)197690.9 mm (3.6 in)39
Longest dry spell (CDD)43 days200018 days39

Wettest day (Rx1day)

Wettest day (Rx1day) at Byllesby 1 S by year The wettest day of the year at Byllesby 1 S, 1967 to 2005. The record is 158.8 mm (6.3 in) in 2004, marked on the chart; the median year is 60.5 mm (2.4 in). 0501001502001970198019902000Record: 158.8 mm (6.3 in) in 2004
The wettest day of the year at Byllesby 1 S, 1967 to 2005. The record is 158.8 mm (6.3 in) in 2004, marked on the chart; the median year is 60.5 mm (2.4 in).
Wettest day (Rx1day) at Byllesby 1 S by year
YearWettest day (Rx1day)
196756.4 mm (2.2 in)
196851.3 mm (2.0 in)
196932.0 mm (1.3 in)
197060.2 mm (2.4 in)
197168.1 mm (2.7 in)
197290.2 mm (3.6 in)
197378.7 mm (3.1 in)
197477.0 mm (3.0 in)
197551.6 mm (2.0 in)
1976110.2 mm (4.3 in)
197751.3 mm (2.0 in)
197844.2 mm (1.7 in)
197960.5 mm (2.4 in)
198045.7 mm (1.8 in)
198151.6 mm (2.0 in)
198249.5 mm (1.9 in)
198355.9 mm (2.2 in)
198461.0 mm (2.4 in)
198590.2 mm (3.6 in)
198641.9 mm (1.6 in)
198749.3 mm (1.9 in)
198838.6 mm (1.5 in)
1989107.7 mm (4.2 in)
199058.7 mm (2.3 in)
199134.3 mm (1.4 in)
199276.7 mm (3.0 in)
199385.1 mm (3.4 in)
199471.6 mm (2.8 in)
199574.2 mm (2.9 in)
199680.3 mm (3.2 in)
199746.7 mm (1.8 in)
199861.7 mm (2.4 in)
199967.3 mm (2.6 in)
200059.7 mm (2.4 in)
200188.6 mm (3.5 in)
200273.7 mm (2.9 in)
200381.3 mm (3.2 in)
2004158.8 mm (6.3 in)
200538.9 mm (1.5 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Byllesby 1 S by year The wettest five days of the year at Byllesby 1 S, 1967 to 2005. The record is 187.9 mm (7.4 in) in 1976, marked on the chart; the median year is 90.9 mm (3.6 in). 501001502001970198019902000Record: 187.9 mm (7.4 in) in 1976
The wettest five days of the year at Byllesby 1 S, 1967 to 2005. The record is 187.9 mm (7.4 in) in 1976, marked on the chart; the median year is 90.9 mm (3.6 in).
Wettest five days (Rx5day) at Byllesby 1 S by year
YearWettest five days (Rx5day)
1967133.6 mm (5.3 in)
196897.3 mm (3.8 in)
196967.6 mm (2.7 in)
1970118.1 mm (4.6 in)
1971105.7 mm (4.2 in)
1972127.3 mm (5.0 in)
1973104.9 mm (4.1 in)
1974119.7 mm (4.7 in)
197589.8 mm (3.5 in)
1976187.9 mm (7.4 in)
197788.9 mm (3.5 in)
197880.5 mm (3.2 in)
197978.6 mm (3.1 in)
198083.1 mm (3.3 in)
198162.8 mm (2.5 in)
198284.5 mm (3.3 in)
198376.7 mm (3.0 in)
198479.2 mm (3.1 in)
1985142.3 mm (5.6 in)
198666.3 mm (2.6 in)
1987104.4 mm (4.1 in)
198870.8 mm (2.8 in)
1989154.8 mm (6.1 in)
1990126.5 mm (5.0 in)
199158.4 mm (2.3 in)
1992100.6 mm (4.0 in)
1993118.4 mm (4.7 in)
199499.8 mm (3.9 in)
1995115.8 mm (4.6 in)
1996118.4 mm (4.7 in)
199771.6 mm (2.8 in)
199890.9 mm (3.6 in)
199986.6 mm (3.4 in)
200073.6 mm (2.9 in)
200193.7 mm (3.7 in)
200285.2 mm (3.4 in)
200382.1 mm (3.2 in)
2004171.4 mm (6.7 in)
200556.6 mm (2.2 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Byllesby 1 S by year The longest dry spell of the year at Byllesby 1 S, 1967 to 2005. The record is 43 days in 2000, marked on the chart; the median year is 18 days. 10203040501970198019902000Record: 43 days in 2000
The longest dry spell of the year at Byllesby 1 S, 1967 to 2005. The record is 43 days in 2000, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at Byllesby 1 S by year
YearLongest dry spell (CDD)
196725 days
196828 days
196918 days
197021 days
197117 days
197220 days
197319 days
197418 days
197514 days
197630 days
197728 days
197825 days
197917 days
198018 days
198122 days
198211 days
198317 days
198424 days
198517 days
198618 days
198714 days
198816 days
198914 days
199022 days
199122 days
199217 days
199317 days
199415 days
199514 days
199615 days
199719 days
199810 days
199916 days
200043 days
200141 days
200220 days
200313 days
200414 days
200510 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

33 years, 1968 to 2002

A day with at least 61.5 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 123.9 mm (4.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Byllesby 1 S: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years61.5 mm (2.4 in)
5 years80.1 mm (3.2 in)
10 years91.6 mm (3.6 in)
25 years105.3 mm (4.1 in)
50 years114.9 mm (4.5 in)Longer than the 33 years of record
100 years123.9 mm (4.9 in)Longer than the 33 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, 33 years of values from 1968 to 2002.

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: 110.2 mm (4.3 in) in 1976; 107.7 mm (4.2 in) in 1989; 90.2 mm (3.6 in) in 1972.

Download the Data

  • Data for Byllesby 1 S standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Byllesby 1 S 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). Records are computed by this site and are not official.

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