Philadelphia Weather Records (USC00306557)

Record envelope, standing records and threshold days for Philadelphia (USC00306557), New York, United States, with 30 years of record.

Key Facts for Philadelphia

Philadelphia (USC00306557) is a weather station in New York, United States at 44.13 latitude and -75.70 longitude, 148 m (485 ft) above sea level.
The station reports from 1907 to 1936, 30 years of record.
1,464 records set at Philadelphia still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: New York, United States, 44.13 latitude, -75.70 longitude.
Elevation: 148 m (485 ft).
Period of record: 1907 to 1936, 30 years.
Eligible elements: none yet.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Philadelphia. 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 Philadelphia, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	16.1 C (61.0 F)	-40.6 C (-41.1 F)	n/a	n/a
Feb	13.3 C (55.9 F)	-37.2 C (-35.0 F)	n/a	n/a
Mar	26.7 C (80.1 F)	-32.2 C (-26.0 F)	n/a	n/a
Apr	30.6 C (87.1 F)	-18.3 C (-0.9 F)	n/a	n/a
May	33.3 C (91.9 F)	-5.0 C (23.0 F)	n/a	n/a
Jun	33.9 C (93.0 F)	-1.1 C (30.0 F)	n/a	n/a
Jul	36.7 C (98.1 F)	4.4 C (39.9 F)	n/a	n/a
Aug	34.4 C (93.9 F)	0.0 C (32.0 F)	n/a	n/a
Sep	32.2 C (90.0 F)	-5.0 C (23.0 F)	n/a	n/a
Oct	29.4 C (84.9 F)	-12.2 C (10.0 F)	n/a	n/a
Nov	23.9 C (75.0 F)	-21.7 C (-7.1 F)	n/a	n/a
Dec	17.2 C (63.0 F)	-43.9 C (-47.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Philadelphia still stand. 1913 holds the most, with 74.

Standing records at Philadelphia by the year they were set
Year set	Standing records
1907	38
1908	51
1909	44
1910	52
1911	62
1912	64
1913	74
1914	69
1915	51
1916	71
1917	43
1918	72
1919	51
1920	46
1921	56
1922	49
1923	56
1924	27
1925	56
1926	49
1927	46
1928	43
1929	46
1930	43
1931	48
1932	48
1933	58
1934	35
1936	16

Wettest Day of Each Month

Oct: 152.4 mm (6.0 in)

The wettest day on record for each calendar month at Philadelphia. The most was 152.4 mm (6.0 in) on 19 October 1930.

Record daily precipitation for each month at Philadelphia
Month	Record daily precipitation (mm)	Date
Jan	31.8 mm (1.3 in)	11 January 1924
Feb	38.9 mm (1.5 in)	15 February 1908
Mar	41.9 mm (1.6 in)	9 March 1919
Apr	38.1 mm (1.5 in)	2 April 1932
May	80.0 mm (3.1 in)	17 May 1916
Jun	71.1 mm (2.8 in)	27 June 1919
Jul	65.0 mm (2.6 in)	17 July 1911
Aug	81.3 mm (3.2 in)	11 August 1920
Sep	105.4 mm (4.1 in)	6 September 1911
Oct	152.4 mm (6.0 in)	19 October 1930
Nov	71.1 mm (2.8 in)	17 November 1927
Dec	38.1 mm (1.5 in)	9 December 1917

Period of Record Coverage

1907 to 1936

29 years of record at Philadelphia, 1907 to 1936. 4 years have data for under 90 percent of days and are left out of rankings: 1907, 1930, 1934, 1936.

Days with data per year at Philadelphia
Year	Days with data	Share of year	Complete
1907	231	63%	No
1908	361	99%	Yes
1909	364	100%	Yes
1910	358	98%	Yes
1911	339	93%	Yes
1912	363	99%	Yes
1913	364	100%	Yes
1914	360	99%	Yes
1915	364	100%	Yes
1916	365	100%	Yes
1917	362	99%	Yes
1918	363	99%	Yes
1919	364	100%	Yes
1920	363	99%	Yes
1921	364	100%	Yes
1922	364	100%	Yes
1923	331	91%	Yes
1924	341	93%	Yes
1925	349	96%	Yes
1926	351	96%	Yes
1927	362	99%	Yes
1928	353	96%	Yes
1929	359	98%	Yes
1930	256	70%	No
1931	361	99%	Yes
1932	364	99%	Yes
1933	363	99%	Yes
1934	266	73%	No
1936	129	35%	No

Latest Records

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

Climate Trend

23 complete years, 1908 to 1933

One stripe for each of 23 complete years at Philadelphia, 1908 to 1933. Blue stripes are years cooler than the station's own mean of 7.0 C (44.5 F); red stripes are warmer. The coolest year was 1917, at 5.0 C (40.9 F), and the warmest was 1921, at 8.7 C (47.7 F). The strongest colour marks a difference of 2.0 C (3.6 F).

Annual mean temperature at Philadelphia as warming stripes, 1908 to 1933
Year	Annual mean temperature	Difference from the station mean
1908	7.3 C	+0.32 C
1909	7.0 C	+0.06 C
1910	6.9 C	-0.06 C
1911	7.4 C	+0.41 C
1912	6.3 C	-0.63 C
1913	8.4 C	+1.38 C
1914	6.0 C	-0.96 C
1915	7.2 C	+0.22 C
1916	6.7 C	-0.30 C
1917	5.0 C	-2.00 C
1918	6.1 C	-0.89 C
1919	7.0 C	+0.06 C
1920	6.5 C	-0.43 C
1921	8.7 C	+1.75 C
1922	7.4 C	+0.45 C
1925	6.7 C	-0.30 C
1926	5.6 C	-1.39 C
1927	7.6 C	+0.61 C
1928	7.4 C	+0.41 C
1929	7.1 C	+0.11 C
1931	7.7 C	+0.74 C
1932	7.4 C	+0.38 C
1933	7.0 C	+0.02 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

1907 to 1936

Yearly extremes at Philadelphia: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	36.7 C (98.1 F)	1911	33.3 C (91.9 F)	29
Coldest night (TNn)	-43.9 C (-47.0 F)	1933	-32.2 C (-26.0 F)	29
Wettest day (Rx1day)	152.4 mm (6.0 in)	1930	43.9 mm (1.7 in)	29
Wettest five days (Rx5day)	171.5 mm (6.8 in)	1930	70.6 mm (2.8 in)	29
Longest dry spell (CDD)	22 days	1908	16 days	29

Hottest day (TXx)

The hottest day of the year at Philadelphia, 1907 to 1936. The record is 36.7 C (98.1 F) in 1911, marked on the chart; the median year is 33.3 C (91.9 F).

Hottest day (TXx) at Philadelphia by year
Year	Hottest day (TXx)
1907	33.9 C (93.0 F)
1908	33.3 C (91.9 F)
1909	31.1 C (88.0 F)
1910	32.8 C (91.0 F)
1911	36.7 C (98.1 F)
1912	33.3 C (91.9 F)
1913	35.6 C (96.1 F)
1914	32.2 C (90.0 F)
1915	31.1 C (88.0 F)
1916	33.9 C (93.0 F)
1917	33.3 C (91.9 F)
1918	32.8 C (91.0 F)
1919	33.3 C (91.9 F)
1920	30.0 C (86.0 F)
1921	36.1 C (97.0 F)
1922	35.6 C (96.1 F)
1923	32.8 C (91.0 F)
1924	31.7 C (89.1 F)
1925	32.8 C (91.0 F)
1926	32.8 C (91.0 F)
1927	33.3 C (91.9 F)
1928	34.4 C (93.9 F)
1929	32.2 C (90.0 F)
1930	31.1 C (88.0 F)
1931	34.4 C (93.9 F)
1932	31.1 C (88.0 F)
1933	35.6 C (96.1 F)
1934	34.4 C (93.9 F)
1936	31.1 C (88.0 F)

Coldest night (TNn)

The coldest night of the year at Philadelphia, 1907 to 1936. The record is -43.9 C (-47.0 F) in 1933, marked on the chart; the median year is -32.2 C (-26.0 F).

Coldest night (TNn) at Philadelphia by year
Year	Coldest night (TNn)
1907	-22.2 C (-8.0 F)
1908	-31.1 C (-24.0 F)
1909	-29.4 C (-20.9 F)
1910	-31.1 C (-24.0 F)
1911	-27.2 C (-17.0 F)
1912	-35.0 C (-31.0 F)
1913	-32.2 C (-26.0 F)
1914	-37.2 C (-35.0 F)
1915	-34.4 C (-29.9 F)
1916	-34.4 C (-29.9 F)
1917	-34.4 C (-29.9 F)
1918	-33.3 C (-27.9 F)
1919	-30.0 C (-22.0 F)
1920	-33.9 C (-29.0 F)
1921	-27.8 C (-18.0 F)
1922	-36.7 C (-34.1 F)
1923	-32.2 C (-26.0 F)
1924	-33.9 C (-29.0 F)
1925	-40.6 C (-41.1 F)
1926	-30.6 C (-23.1 F)
1927	-33.3 C (-27.9 F)
1928	-23.3 C (-9.9 F)
1929	-28.9 C (-20.0 F)
1930	-23.9 C (-11.0 F)
1931	-32.2 C (-26.0 F)
1932	-32.2 C (-26.0 F)
1933	-43.9 C (-47.0 F)
1934	-36.7 C (-34.1 F)
1936	-23.9 C (-11.0 F)

Wettest day (Rx1day)

The wettest day of the year at Philadelphia, 1907 to 1936. The record is 152.4 mm (6.0 in) in 1930, marked on the chart; the median year is 43.9 mm (1.7 in).

Wettest day (Rx1day) at Philadelphia by year
Year	Wettest day (Rx1day)
1907	43.4 mm (1.7 in)
1908	38.9 mm (1.5 in)
1909	38.1 mm (1.5 in)
1910	41.4 mm (1.6 in)
1911	105.4 mm (4.1 in)
1912	71.9 mm (2.8 in)
1913	42.4 mm (1.7 in)
1914	36.1 mm (1.4 in)
1915	30.5 mm (1.2 in)
1916	80.0 mm (3.1 in)
1917	38.6 mm (1.5 in)
1918	43.9 mm (1.7 in)
1919	71.1 mm (2.8 in)
1920	81.3 mm (3.2 in)
1921	49.3 mm (1.9 in)
1922	52.1 mm (2.1 in)
1923	59.4 mm (2.3 in)
1924	34.3 mm (1.4 in)
1925	51.8 mm (2.0 in)
1926	56.9 mm (2.2 in)
1927	71.1 mm (2.8 in)
1928	59.4 mm (2.3 in)
1929	41.9 mm (1.6 in)
1930	152.4 mm (6.0 in)
1931	32.5 mm (1.3 in)
1932	73.2 mm (2.9 in)
1933	32.0 mm (1.3 in)
1934	39.9 mm (1.6 in)
1936	30.5 mm (1.2 in)

Wettest five days (Rx5day)

The wettest five days of the year at Philadelphia, 1907 to 1936. The record is 171.5 mm (6.8 in) in 1930, marked on the chart; the median year is 70.6 mm (2.8 in).

Wettest five days (Rx5day) at Philadelphia by year
Year	Wettest five days (Rx5day)
1907	59.7 mm (2.4 in)
1908	73.0 mm (2.9 in)
1909	52.8 mm (2.1 in)
1910	70.1 mm (2.8 in)
1911	45.0 mm (1.8 in)
1912	93.8 mm (3.7 in)
1913	100.3 mm (3.9 in)
1914	68.2 mm (2.7 in)
1915	63.2 mm (2.5 in)
1916	116.1 mm (4.6 in)
1917	82.3 mm (3.2 in)
1918	67.9 mm (2.7 in)
1919	112.3 mm (4.4 in)
1920	96.8 mm (3.8 in)
1921	66.3 mm (2.6 in)
1922	70.6 mm (2.8 in)
1923	66.3 mm (2.6 in)
1924	51.6 mm (2.0 in)
1925	128.0 mm (5.0 in)
1926	80.6 mm (3.2 in)
1927	95.5 mm (3.8 in)
1928	100.3 mm (3.9 in)
1929	73.0 mm (2.9 in)
1930	171.5 mm (6.8 in)
1931	47.8 mm (1.9 in)
1932	73.2 mm (2.9 in)
1933	38.7 mm (1.5 in)
1934	39.9 mm (1.6 in)
1936	48.2 mm (1.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Philadelphia, 1907 to 1936. The record is 22 days in 1908, marked on the chart; the median year is 16 days.

Longest dry spell (CDD) at Philadelphia by year
Year	Longest dry spell (CDD)
1907	13 days
1908	22 days
1909	14 days
1910	17 days
1911	15 days
1912	17 days
1913	12 days
1914	16 days
1915	22 days
1916	16 days
1917	19 days
1918	11 days
1919	14 days
1920	21 days
1921	11 days
1922	18 days
1923	14 days
1924	20 days
1925	10 days
1926	7 days
1927	11 days
1928	9 days
1929	9 days
1930	22 days
1931	21 days
1932	14 days
1933	16 days
1934	17 days
1936	17 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

23 years with a frost

Across 23 years with a frost, the median last spring frost at Philadelphia falls on 15 May and the median first autumn frost on 30 September, which leaves a median of 133 days between them.

Frost dates and growing season at Philadelphia
Measure	Median, all years	Earliest period	Recent period (1908 to 1933)	Recent against earliest	Fitted trend
Last spring frost	15 May	n/a	15 May	n/a	n/a
First autumn frost	30 September	n/a	30 September	n/a	n/a
Growing days	133 days	n/a	133 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 Philadelphia standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Philadelphia 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).