Williamsport 2 Weather Records (USC00369735)

Record envelope, standing records and threshold days for Williamsport 2 (USC00369735), Pennsylvania, United States, with 30 years of record.

Key Facts for Williamsport 2

Williamsport 2 (USC00369735) is a weather station in Pennsylvania, United States at 41.25 latitude and -76.98 longitude, 160 m (525 ft) above sea level.
The station reports from 1997 to 2026, 30 years of record.
1,464 records set at Williamsport 2 still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Pennsylvania, United States, 41.25 latitude, -76.98 longitude.
Elevation: 160 m (525 ft).
Period of record: 1997 to 2026, 30 years.
Eligible elements: none yet.

Daily Record Envelope and 2026

36 days at or beyond a record

The band shows the record high and record low for each calendar day at Williamsport 2. The lines show the 2026 daily maximum and minimum. 36 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Williamsport 2, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	19.4 C (66.9 F)	-23.9 C (-11.0 F)	7.8 C (46.0 F)	-20.0 C (-4.0 F)
Feb	23.9 C (75.0 F)	-21.7 C (-7.1 F)	10.6 C (51.1 F)	-11.7 C (10.9 F)
Mar	28.9 C (84.0 F)	-16.7 C (1.9 F)	26.1 C (79.0 F)	-7.8 C (18.0 F)
Apr	35.0 C (95.0 F)	-6.7 C (19.9 F)	31.1 C (88.0 F)	-4.4 C (24.1 F)
May	36.7 C (98.1 F)	-1.7 C (28.9 F)	28.3 C (82.9 F)	5.0 C (41.0 F)
Jun	36.7 C (98.1 F)	3.9 C (39.0 F)	36.7 C (98.1 F)	6.1 C (43.0 F)
Jul	40.0 C (104.0 F)	7.8 C (46.0 F)	36.1 C (97.0 F)	13.9 C (57.0 F)
Aug	37.8 C (100.0 F)	6.7 C (44.1 F)	33.9 C (93.0 F)	6.7 C (44.1 F)
Sep	37.2 C (99.0 F)	0.6 C (33.1 F)	31.1 C (88.0 F)	6.7 C (44.1 F)
Oct	32.2 C (90.0 F)	-3.3 C (26.1 F)	28.3 C (82.9 F)	-2.2 C (28.0 F)
Nov	25.6 C (78.1 F)	-11.7 C (10.9 F)	21.1 C (70.0 F)	-2.2 C (28.0 F)
Dec	20.6 C (69.1 F)	-19.4 C (-2.9 F)	13.9 C (57.0 F)	-14.4 C (6.1 F)

Which Years Hold Standing Records

1,464 standing records

1,464 records at Williamsport 2 still stand. 2002 holds the most, with 95.

Standing records at Williamsport 2 by the year they were set
Year set	Standing records
1999	54
2000	72
2001	55
2002	95
2003	63
2004	47
2005	63
2006	54
2007	74
2008	43
2009	48
2010	41
2011	41
2012	45
2013	57
2014	50
2015	81
2016	69
2017	74
2018	50
2019	35
2020	50
2021	37
2022	35
2023	34
2024	53
2025	44

Wettest Day of Each Month

Sep: 141.2 mm (5.6 in)

The wettest day on record for each calendar month at Williamsport 2. The most was 141.2 mm (5.6 in) on 7 September 1999.

Record daily precipitation for each month at Williamsport 2
Month	Record daily precipitation (mm)	Date
Jan	73.7 mm (2.9 in)	25 January 2010
Feb	48.3 mm (1.9 in)	16 February 2016
Mar	59.2 mm (2.3 in)	10 March 2011
Apr	59.4 mm (2.3 in)	16 April 2018
May	67.8 mm (2.7 in)	16 May 2014
Jun	75.9 mm (3.0 in)	18 June 2017
Jul	64.5 mm (2.5 in)	24 July 2023
Aug	130.6 mm (5.1 in)	9 August 2024
Sep	141.2 mm (5.6 in)	7 September 1999
Oct	95.0 mm (3.7 in)	29 October 2017
Nov	90.9 mm (3.6 in)	29 November 2005
Dec	77.7 mm (3.1 in)	1 December 2010

Period of Record Coverage

1999 to 2025

27 years of record at Williamsport 2, 1999 to 2025. Every year has data for at least 90 percent of its days.

Days with data per year at Williamsport 2
Year	Days with data	Share of year	Complete
1999	334	92%	Yes
2000	366	100%	Yes
2001	365	100%	Yes
2002	365	100%	Yes
2003	364	100%	Yes
2004	334	91%	Yes
2005	365	100%	Yes
2006	365	100%	Yes
2007	365	100%	Yes
2008	366	100%	Yes
2009	364	100%	Yes
2010	365	100%	Yes
2011	365	100%	Yes
2012	336	92%	Yes
2013	364	100%	Yes
2014	365	100%	Yes
2015	365	100%	Yes
2016	366	100%	Yes
2017	365	100%	Yes
2018	365	100%	Yes
2019	365	100%	Yes
2020	366	100%	Yes
2021	365	100%	Yes
2022	365	100%	Yes
2023	365	100%	Yes
2024	366	100%	Yes
2025	365	100%	Yes

Latest Records

No records were set at this station in the latest data.

Climate Trend

24 complete years, 2000 to 2025

One stripe for each of 24 complete years at Williamsport 2, 2000 to 2025. Blue stripes are years cooler than the station's own mean of 11.4 C (52.5 F); red stripes are warmer. The coolest year was 2003, at 10.2 C (50.3 F), and the warmest was 2016, at 12.4 C (54.4 F). The strongest colour marks a difference of 1.2 C (2.2 F).

Annual mean temperature at Williamsport 2 as warming stripes, 2000 to 2025
Year	Annual mean temperature	Difference from the station mean
2000	10.5 C	-0.92 C
2001	11.3 C	-0.04 C
2002	11.6 C	+0.23 C
2003	10.2 C	-1.18 C
2005	11.2 C	-0.15 C
2006	11.9 C	+0.49 C
2007	11.1 C	-0.32 C
2008	10.7 C	-0.71 C
2009	10.6 C	-0.80 C
2010	11.7 C	+0.32 C
2011	11.5 C	+0.15 C
2013	11.3 C	-0.12 C
2014	10.4 C	-0.94 C
2015	11.6 C	+0.27 C
2016	12.4 C	+1.06 C
2017	11.8 C	+0.43 C
2018	11.2 C	-0.20 C
2019	11.1 C	-0.29 C
2020	11.9 C	+0.54 C
2021	12.0 C	+0.60 C
2022	11.2 C	-0.20 C
2023	12.2 C	+0.79 C
2024	12.3 C	+0.95 C
2025	11.3 C	-0.04 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1997 to 2026

Yearly extremes at Williamsport 2: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.0 C (104.0 F)	2011	36.7 C (98.1 F)	28
Coldest night (TNn)	-23.9 C (-11.0 F)	2009	-17.5 C (0.5 F)	28
Wettest day (Rx1day)	141.2 mm (5.6 in)	1999	60.2 mm (2.4 in)	30
Wettest five days (Rx5day)	248.5 mm (9.8 in)	2011	90.4 mm (3.6 in)	30
Longest dry spell (CDD)	35 days	2023	16 days	30

Hottest day (TXx)

The hottest day of the year at Williamsport 2, 1997 to 2026. The record is 40.0 C (104.0 F) in 2011, marked on the chart; the median year is 36.7 C (98.1 F).

Hottest day (TXx) at Williamsport 2 by year
Year	Hottest day (TXx)
1997	n/a
1998	n/a
1999	36.7 C (98.1 F)
2000	34.4 C (93.9 F)
2001	37.2 C (99.0 F)
2002	37.2 C (99.0 F)
2003	34.4 C (93.9 F)
2004	34.4 C (93.9 F)
2005	37.8 C (100.0 F)
2006	36.7 C (98.1 F)
2007	37.8 C (100.0 F)
2008	36.1 C (97.0 F)
2009	35.0 C (95.0 F)
2010	37.8 C (100.0 F)
2011	40.0 C (104.0 F)
2012	37.8 C (100.0 F)
2013	36.7 C (98.1 F)
2014	33.9 C (93.0 F)
2015	34.4 C (93.9 F)
2016	36.7 C (98.1 F)
2017	35.0 C (95.0 F)
2018	36.1 C (97.0 F)
2019	35.6 C (96.1 F)
2020	36.7 C (98.1 F)
2021	36.7 C (98.1 F)
2022	36.1 C (97.0 F)
2023	35.6 C (96.1 F)
2024	36.7 C (98.1 F)
2025	36.7 C (98.1 F)
2026	37.8 C (100.0 F)

Coldest night (TNn)

The coldest night of the year at Williamsport 2, 1997 to 2026. The record is -23.9 C (-11.0 F) in 2009, marked on the chart; the median year is -17.5 C (0.5 F).

Coldest night (TNn) at Williamsport 2 by year
Year	Coldest night (TNn)
1997	n/a
1998	n/a
1999	-13.9 C (7.0 F)
2000	-19.4 C (-2.9 F)
2001	-13.9 C (7.0 F)
2002	-14.4 C (6.1 F)
2003	-16.7 C (1.9 F)
2004	-18.9 C (-2.0 F)
2005	-18.9 C (-2.0 F)
2006	-12.8 C (9.0 F)
2007	-17.2 C (1.0 F)
2008	-15.0 C (5.0 F)
2009	-23.9 C (-11.0 F)
2010	-14.4 C (6.1 F)
2011	-21.1 C (-6.0 F)
2012	-13.9 C (7.0 F)
2013	-14.4 C (6.1 F)
2014	-20.6 C (-5.1 F)
2015	-21.7 C (-7.1 F)
2016	-17.8 C (0.0 F)
2017	-18.3 C (-0.9 F)
2018	-20.0 C (-4.0 F)
2019	-20.0 C (-4.0 F)
2020	-15.6 C (3.9 F)
2021	-15.0 C (5.0 F)
2022	-21.1 C (-6.0 F)
2023	-15.0 C (5.0 F)
2024	-15.0 C (5.0 F)
2025	-20.0 C (-4.0 F)
2026	-21.1 C (-6.0 F)

Wettest day (Rx1day)

The wettest day of the year at Williamsport 2, 1997 to 2026. The record is 141.2 mm (5.6 in) in 1999, marked on the chart; the median year is 60.2 mm (2.4 in).

Wettest day (Rx1day) at Williamsport 2 by year
Year	Wettest day (Rx1day)
1997	44.7 mm (1.8 in)
1998	43.2 mm (1.7 in)
1999	141.2 mm (5.6 in)
2000	49.8 mm (2.0 in)
2001	48.0 mm (1.9 in)
2002	59.2 mm (2.3 in)
2003	58.4 mm (2.3 in)
2004	97.3 mm (3.8 in)
2005	90.9 mm (3.6 in)
2006	110.5 mm (4.4 in)
2007	47.0 mm (1.9 in)
2008	48.8 mm (1.9 in)
2009	41.9 mm (1.6 in)
2010	88.9 mm (3.5 in)
2011	113.3 mm (4.5 in)
2012	50.8 mm (2.0 in)
2013	32.8 mm (1.3 in)
2014	67.8 mm (2.7 in)
2015	61.7 mm (2.4 in)
2016	54.6 mm (2.1 in)
2017	95.0 mm (3.7 in)
2018	61.2 mm (2.4 in)
2019	36.1 mm (1.4 in)
2020	57.7 mm (2.3 in)
2021	67.6 mm (2.7 in)
2022	43.9 mm (1.7 in)
2023	64.5 mm (2.5 in)
2024	130.6 mm (5.1 in)
2025	64.0 mm (2.5 in)
2026	107.7 mm (4.2 in)

Wettest five days (Rx5day)

The wettest five days of the year at Williamsport 2, 1997 to 2026. The record is 248.5 mm (9.8 in) in 2011, marked on the chart; the median year is 90.4 mm (3.6 in).

Wettest five days (Rx5day) at Williamsport 2 by year
Year	Wettest five days (Rx5day)
1997	64.8 mm (2.6 in)
1998	82.5 mm (3.2 in)
1999	169.4 mm (6.7 in)
2000	70.9 mm (2.8 in)
2001	99.8 mm (3.9 in)
2002	104.1 mm (4.1 in)
2003	92.5 mm (3.6 in)
2004	160.8 mm (6.3 in)
2005	110.2 mm (4.3 in)
2006	197.6 mm (7.8 in)
2007	86.8 mm (3.4 in)
2008	88.2 mm (3.5 in)
2009	62.5 mm (2.5 in)
2010	152.9 mm (6.0 in)
2011	248.5 mm (9.8 in)
2012	75.5 mm (3.0 in)
2013	64.3 mm (2.5 in)
2014	82.3 mm (3.2 in)
2015	71.9 mm (2.8 in)
2016	66.3 mm (2.6 in)
2017	109.3 mm (4.3 in)
2018	205.2 mm (8.1 in)
2019	79.4 mm (3.1 in)
2020	73.8 mm (2.9 in)
2021	98.3 mm (3.9 in)
2022	101.0 mm (4.0 in)
2023	82.8 mm (3.3 in)
2024	169.5 mm (6.7 in)
2025	79.1 mm (3.1 in)
2026	113.5 mm (4.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Williamsport 2, 1997 to 2026. The record is 35 days in 2023, marked on the chart; the median year is 16 days.

Longest dry spell (CDD) at Williamsport 2 by year
Year	Longest dry spell (CDD)
1997	12 days
1998	19 days
1999	18 days
2000	12 days
2001	30 days
2002	13 days
2003	16 days
2004	14 days
2005	18 days
2006	20 days
2007	14 days
2008	23 days
2009	20 days
2010	19 days
2011	6 days
2012	13 days
2013	12 days
2014	19 days
2015	15 days
2016	17 days
2017	22 days
2018	13 days
2019	13 days
2020	15 days
2021	15 days
2022	15 days
2023	35 days
2024	25 days
2025	20 days
2026	11 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.

Frost Dates and Growing Season

24 years with a frost

Across 24 years with a frost, the median last spring frost at Williamsport 2 falls on 29 April and the median first autumn frost on 25 October, which leaves a median of 175 days between them.

Frost dates and growing season at Williamsport 2
Measure	Median, all years	Earliest period	Recent period (2000 to 2025)	Recent against earliest	Fitted trend
Last spring frost	29 April	n/a	29 April	n/a	n/a
First autumn frost	25 October	n/a	25 October	n/a	n/a
Growing days	175 days	n/a	175 days	n/a	n/a

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Download the Data

Data for Williamsport 2 standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Williamsport 2 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

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