Pottstown Weather Records (USC00367149)

Record envelope, standing records and threshold days for Pottstown (USC00367149), Pennsylvania, United States, with 63 years of record.

Key Facts for Pottstown

Pottstown (USC00367149) is a weather station in Pennsylvania, United States at 40.25 latitude and -75.65 longitude, 37 m (120 ft) above sea level.
The station reports from 1894 to 1956, 63 years of record.
1,462 records set at Pottstown still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Pottstown set a daily record precipitation of 17.3 mm (0.7 in) on 28 September 1956.

About the Station

Location: Pennsylvania, United States, 40.25 latitude, -75.65 longitude.
Elevation: 37 m (120 ft).
Period of record: 1894 to 1956, 63 years.
Eligible elements: prcp.

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 Pottstown. 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 Pottstown, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	15.6 C (60.1 F)	-15.6 C (3.9 F)	n/a	n/a
Feb	15.6 C (60.1 F)	-17.8 C (0.0 F)	n/a	n/a
Mar	26.7 C (80.1 F)	-15.6 C (3.9 F)	n/a	n/a
Apr	34.4 C (93.9 F)	-6.1 C (21.0 F)	n/a	n/a
May	36.1 C (97.0 F)	1.7 C (35.1 F)	n/a	n/a
Jun	37.2 C (99.0 F)	7.2 C (45.0 F)	n/a	n/a
Jul	39.4 C (102.9 F)	10.6 C (51.1 F)	n/a	n/a
Aug	36.7 C (98.1 F)	8.9 C (48.0 F)	n/a	n/a
Sep	36.7 C (98.1 F)	2.2 C (36.0 F)	n/a	n/a
Oct	31.1 C (88.0 F)	-3.3 C (26.1 F)	n/a	n/a
Nov	24.4 C (75.9 F)	-6.7 C (19.9 F)	n/a	n/a
Dec	17.8 C (64.0 F)	-15.6 C (3.9 F)	n/a	n/a

Which Years Hold Standing Records

1,462 standing records

1,462 records at Pottstown still stand. 1896 holds the most, with 286.

All-Time Record Progression

1 new records

1 all-time records were set at Pottstown between 13 August 1955 and 13 August 1955. Each dot is a new record.

Wettest Day of Each Month

Aug: 119.6 mm (4.7 in)

The wettest day on record for each calendar month at Pottstown. The most was 119.6 mm (4.7 in) on 13 August 1955.

Record daily precipitation for each month at Pottstown
Month	Record daily precipitation (mm)	Date
Jan	58.4 mm (2.3 in)	22 January 1902
Feb	86.4 mm (3.4 in)	6 February 1896
Mar	76.2 mm (3.0 in)	28 March 1932
Apr	67.3 mm (2.6 in)	10 April 1902
May	78.2 mm (3.1 in)	22 May 1894
Jun	83.8 mm (3.3 in)	2 June 1946
Jul	82.6 mm (3.3 in)	13 July 1949
Aug	119.6 mm (4.7 in)	13 August 1955
Sep	105.9 mm (4.2 in)	8 September 1894
Oct	91.9 mm (3.6 in)	2 October 1929
Nov	69.9 mm (2.8 in)	9 November 1943
Dec	81.3 mm (3.2 in)	30 December 1901

Period of Record Coverage

1894 to 1902

7 years of record at Pottstown, 1894 to 1902. 2 years have data for under 90 percent of days and are left out of rankings: 1898, 1902.

Latest Records

Latest records at Pottstown
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
28 September 1956	Pottstown, US	daily rain	17.3 mm (0.7 in)	5.6 mm (0.22 in)	1 year	9 of 100 (Routine)
31 August 1956	Pottstown, US	daily rain	52.6 mm (2.1 in)	11.5 mm (0.5 in)	2 years	14 of 100 (Routine)
21 August 1956	Pottstown, US	daily rain	47.8 mm (1.9 in)	19.6 mm (0.8 in)	42 years	32 of 100 (Routine)
5 August 1956	Pottstown, US	daily rain	19.1 mm (0.8 in)	13.0 mm (0.5 in)	13 years	18 of 100 (Routine)
21 July 1956	Pottstown, US	daily rain	54.6 mm (2.1 in)	1.3 mm (0.05 in)	61 years	24 of 100 (Routine)
24 June 1956	Pottstown, US	daily rain	18.8 mm (0.7 in)	3.6 mm (0.14 in)	59 years	20 of 100 (Routine)
19 March 1956	Pottstown, US	daily rain	37.6 mm (1.5 in)	7.1 mm (0.28 in)	59 years	30 of 100 (Routine)
17 March 1956	Pottstown, US	daily rain	16.3 mm (0.6 in)	0.3 mm (0.01 in)	24 years	13 of 100 (Routine)
14 March 1956	Pottstown, US	daily rain	27.2 mm (1.1 in)	4.1 mm (0.16 in)	2 years	10 of 100 (Routine)
18 February 1956	Pottstown, US	daily rain	36.6 mm (1.4 in)	19.8 mm (0.8 in)	28 years	32 of 100 (Routine)
7 February 1956	Pottstown, US	daily rain	51.6 mm (2.0 in)	19.6 mm (0.8 in)	0 years	24 of 100 (Routine)
11 November 1955	Pottstown, US	daily rain	18.3 mm (0.7 in)	10.4 mm (0.4 in)	36 years	20 of 100 (Routine)
15 October 1955	Pottstown, US	daily rain	34.0 mm (1.3 in)	13.4 mm (0.5 in)	29 years	24 of 100 (Routine)
28 September 1955	Pottstown, US	daily rain	11.7 mm (0.5 in)	4.8 mm (0.19 in)	28 years	17 of 100 (Routine)
25 September 1955	Pottstown, US	daily rain	10.7 mm (0.4 in)	4.3 mm (0.17 in)	40 years	20 of 100 (Routine)
24 September 1955	Pottstown, US	daily rain	14.2 mm (0.6 in)	10.4 mm (0.4 in)	12 years	16 of 100 (Routine)
19 August 1955	Pottstown, US	daily rain	75.9 mm (3.0 in)	37.3 mm (1.5 in)	53 years	52 of 100 (Notable)
13 August 1955	Pottstown, US	all-time rain	119.6 mm (4.7 in)	13.7 mm (0.5 in)	60 years	55 of 100 (Notable)
9 June 1955	Pottstown, US	daily rain	47.0 mm (1.9 in)	27.9 mm (1.1 in)	24 years	38 of 100 (Notable)
22 March 1955	Pottstown, US	daily rain	49.5 mm (1.9 in)	28.9 mm (1.1 in)	38 years	45 of 100 (Notable)

Extremes by Year

1894 to 1956

Yearly extremes at Pottstown: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	39.4 C (102.9 F)	1898	36.7 C (98.1 F)	7
Coldest night (TNn)	-17.8 C (0.0 F)	1895	-15.8 C (3.5 F)	8
Wettest day (Rx1day)	119.6 mm (4.7 in)	1955	55.5 mm (2.2 in)	50
Wettest five days (Rx5day)	241.8 mm (9.5 in)	1955	83.2 mm (3.3 in)	50
Longest dry spell (CDD)	34 days	1924	16 days	50

Hottest day (TXx)

The hottest day of the year at Pottstown, 1894 to 1956. The record is 39.4 C (102.9 F) in 1898, marked on the chart; the median year is 36.7 C (98.1 F).

Hottest day (TXx) at Pottstown by year
Year	Hottest day (TXx)
1894	36.7 C (98.1 F)
1895	37.2 C (99.0 F)
1896	36.7 C (98.1 F)
1897	35.6 C (96.1 F)
1898	39.4 C (102.9 F)
1901	38.3 C (100.9 F)
1902	33.3 C (91.9 F)
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a

Coldest night (TNn)

The coldest night of the year at Pottstown, 1894 to 1956. The record is -17.8 C (0.0 F) in 1895, marked on the chart; the median year is -15.8 C (3.5 F).

Coldest night (TNn) at Pottstown by year
Year	Coldest night (TNn)
1894	-16.1 C (3.0 F)
1895	-17.8 C (0.0 F)
1896	-16.1 C (3.0 F)
1897	-15.6 C (3.9 F)
1898	-16.7 C (1.9 F)
1901	-12.2 C (10.0 F)
1902	-11.7 C (10.9 F)
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	31.7 C (89.1 F)
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a

Wettest day (Rx1day)

The wettest day of the year at Pottstown, 1894 to 1956. The record is 119.6 mm (4.7 in) in 1955, marked on the chart; the median year is 55.5 mm (2.2 in).

Wettest day (Rx1day) at Pottstown by year
Year	Wettest day (Rx1day)
1894	105.9 mm (4.2 in)
1895	52.1 mm (2.1 in)
1896	86.4 mm (3.4 in)
1897	71.1 mm (2.8 in)
1898	52.8 mm (2.1 in)
1901	81.3 mm (3.2 in)
1902	67.3 mm (2.6 in)
1914	53.8 mm (2.1 in)
1915	66.0 mm (2.6 in)
1916	38.6 mm (1.5 in)
1917	36.3 mm (1.4 in)
1918	51.8 mm (2.0 in)
1919	75.7 mm (3.0 in)
1920	47.8 mm (1.9 in)
1921	37.8 mm (1.5 in)
1922	39.9 mm (1.6 in)
1923	68.1 mm (2.7 in)
1924	63.2 mm (2.5 in)
1925	52.1 mm (2.1 in)
1926	46.0 mm (1.8 in)
1927	50.0 mm (2.0 in)
1928	58.2 mm (2.3 in)
1929	91.9 mm (3.6 in)
1930	52.3 mm (2.1 in)
1931	65.0 mm (2.6 in)
1932	76.2 mm (3.0 in)
1933	25.4 mm (1.0 in)
1934	88.9 mm (3.5 in)
1935	63.5 mm (2.5 in)
1936	41.9 mm (1.6 in)
1937	45.5 mm (1.8 in)
1938	44.5 mm (1.8 in)
1939	36.8 mm (1.4 in)
1940	45.7 mm (1.8 in)
1941	36.8 mm (1.4 in)
1942	37.1 mm (1.5 in)
1943	69.9 mm (2.8 in)
1944	67.3 mm (2.6 in)
1945	64.5 mm (2.5 in)
1946	83.8 mm (3.3 in)
1947	43.7 mm (1.7 in)
1948	48.0 mm (1.9 in)
1949	82.6 mm (3.3 in)
1950	65.5 mm (2.6 in)
1951	56.4 mm (2.2 in)
1952	63.8 mm (2.5 in)
1953	59.7 mm (2.4 in)
1954	48.3 mm (1.9 in)
1955	119.6 mm (4.7 in)
1956	54.6 mm (2.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Pottstown, 1894 to 1956. The record is 241.8 mm (9.5 in) in 1955, marked on the chart; the median year is 83.2 mm (3.3 in).

Wettest five days (Rx5day) at Pottstown by year
Year	Wettest five days (Rx5day)
1894	220.1 mm (8.7 in)
1895	69.9 mm (2.8 in)
1896	83.8 mm (3.3 in)
1897	90.2 mm (3.6 in)
1898	82.5 mm (3.2 in)
1901	111.8 mm (4.4 in)
1902	81.3 mm (3.2 in)
1914	100.4 mm (4.0 in)
1915	113.0 mm (4.4 in)
1916	66.8 mm (2.6 in)
1917	68.1 mm (2.7 in)
1918	71.6 mm (2.8 in)
1919	121.5 mm (4.8 in)
1920	70.7 mm (2.8 in)
1921	51.1 mm (2.0 in)
1922	61.8 mm (2.4 in)
1923	76.0 mm (3.0 in)
1924	92.9 mm (3.7 in)
1925	52.1 mm (2.1 in)
1926	66.9 mm (2.6 in)
1927	83.6 mm (3.3 in)
1928	72.2 mm (2.8 in)
1929	127.0 mm (5.0 in)
1930	63.2 mm (2.5 in)
1931	76.1 mm (3.0 in)
1932	87.4 mm (3.4 in)
1933	64.7 mm (2.5 in)
1934	108.5 mm (4.3 in)
1935	112.3 mm (4.4 in)
1936	73.6 mm (2.9 in)
1937	63.3 mm (2.5 in)
1938	110.8 mm (4.4 in)
1939	78.7 mm (3.1 in)
1940	63.6 mm (2.5 in)
1941	81.5 mm (3.2 in)
1942	51.6 mm (2.0 in)
1943	114.1 mm (4.5 in)
1944	74.2 mm (2.9 in)
1945	94.1 mm (3.7 in)
1946	113.8 mm (4.5 in)
1947	105.4 mm (4.1 in)
1948	88.2 mm (3.5 in)
1949	90.0 mm (3.5 in)
1950	124.4 mm (4.9 in)
1951	95.0 mm (3.7 in)
1952	128.0 mm (5.0 in)
1953	101.1 mm (4.0 in)
1954	61.5 mm (2.4 in)
1955	241.8 mm (9.5 in)
1956	82.8 mm (3.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at Pottstown, 1894 to 1956. The record is 34 days in 1924, marked on the chart; the median year is 16 days.

Longest dry spell (CDD) at Pottstown by year
Year	Longest dry spell (CDD)
1894	16 days
1895	13 days
1896	12 days
1897	19 days
1898	15 days
1901	19 days
1902	13 days
1914	21 days
1915	22 days
1916	14 days
1917	21 days
1918	16 days
1919	15 days
1920	26 days
1921	16 days
1922	24 days
1923	17 days
1924	34 days
1925	16 days
1926	15 days
1927	13 days
1928	14 days
1929	17 days
1930	28 days
1931	23 days
1932	18 days
1933	12 days
1934	16 days
1935	18 days
1936	12 days
1937	8 days
1938	15 days
1939	26 days
1940	17 days
1941	30 days
1942	8 days
1943	24 days
1944	15 days
1945	13 days
1946	16 days
1947	33 days
1948	14 days
1949	14 days
1950	15 days
1951	13 days
1952	18 days
1953	19 days
1954	18 days
1955	28 days
1956	9 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

34 years, 1895 to 1955

A day with at least 57.3 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 121.0 mm (4.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Pottstown: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	57.3 mm (2.3 in)
5 years	74.5 mm (2.9 in)
10 years	85.8 mm (3.4 in)
25 years	100.0 mm (3.9 in)
50 years	110.6 mm (4.4 in)	Longer than the 34 years of record
100 years	121.0 mm (4.8 in)	Longer than the 34 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, 34 years of values from 1895 to 1955.

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: 119.6 mm (4.7 in) in 1955; 91.9 mm (3.6 in) in 1929; 88.9 mm (3.5 in) in 1934.

Download the Data

Data for Pottstown standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Pottstown 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).

Year	Days with data	Share of year	Complete
1894	347	95%	Yes
1895	352	96%	Yes
1896	358	98%	Yes
1897	362	99%	Yes
1898	302	83%	No
1901	357	98%	Yes
1902	239	65%	No