Graterford Weather Records (USC00363435)

Record envelope, standing records and threshold days for Graterford (USC00363435), Pennsylvania, United States, with 53 years of record.

Key Facts for Graterford

Graterford (USC00363435) is a weather station in Pennsylvania, United States at 40.23 latitude and -75.45 longitude, 46 m (151 ft) above sea level.
The station reports from 1920 to 1972, 53 years of record.
1,414 records set at Graterford still stand.
Records are tracked for prcp, snow: an element needs 30 years of data to be eligible.
Graterford set a daily record snowfall of 5.1 cm (2.0 in) on 24 February 1972.

About the Station

Location: Pennsylvania, United States, 40.23 latitude, -75.45 longitude.
Elevation: 46 m (151 ft).
Period of record: 1920 to 1972, 53 years.
Eligible elements: prcp, snow.

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 Graterford. 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 Graterford, 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)	-22.2 C (-8.0 F)	n/a	n/a
Feb	14.4 C (57.9 F)	-8.9 C (16.0 F)	n/a	n/a
Mar	25.6 C (78.1 F)	-7.8 C (18.0 F)	n/a	n/a
Apr	32.2 C (90.0 F)	-3.3 C (26.1 F)	n/a	n/a
May	31.1 C (88.0 F)	1.1 C (34.0 F)	n/a	n/a
Jun	37.8 C (100.0 F)	12.2 C (54.0 F)	n/a	n/a
Jul	38.9 C (102.0 F)	11.1 C (52.0 F)	n/a	n/a
Aug	35.6 C (96.1 F)	7.8 C (46.0 F)	n/a	n/a
Sep	33.3 C (91.9 F)	-2.8 C (27.0 F)	n/a	n/a
Oct	24.4 C (75.9 F)	-3.9 C (25.0 F)	n/a	n/a
Nov	24.4 C (75.9 F)	-10.6 C (12.9 F)	n/a	n/a
Dec	18.9 C (66.0 F)	-12.2 C (10.0 F)	n/a	n/a

Which Years Hold Standing Records

1,414 standing records

1,414 records at Graterford still stand. 1957 holds the most, with 1,286.

Wettest Day of Each Month

Jul: 144.0 mm (5.7 in)

The wettest day on record for each calendar month at Graterford. The most was 144.0 mm (5.7 in) on 9 July 1935.

Record daily precipitation for each month at Graterford
Month	Record daily precipitation (mm)	Date
Jan	51.3 mm (2.0 in)	5 January 1971
Feb	59.4 mm (2.3 in)	14 February 1966
Mar	61.0 mm (2.4 in)	6 March 1967
Apr	51.3 mm (2.0 in)	7 April 1971
May	61.0 mm (2.4 in)	29 May 1968
Jun	91.2 mm (3.6 in)	2 June 1946
Jul	144.0 mm (5.7 in)	9 July 1935
Aug	122.7 mm (4.8 in)	9 August 1942
Sep	114.3 mm (4.5 in)	13 September 1971
Oct	75.9 mm (3.0 in)	15 October 1955
Nov	79.2 mm (3.1 in)	26 November 1950
Dec	61.0 mm (2.4 in)	30 December 1948

Period of Record Coverage

1956 to 1958

3 years of record at Graterford, 1956 to 1958. 2 years have data for under 90 percent of days and are left out of rankings: 1956, 1958.

Latest Records

Latest records at Graterford
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
24 February 1972	Graterford, US	daily snowfall	5.1 cm (2.0 in)	3.8 cm (1.5 in)	2 years	10 of 100 (Routine)
13 September 1971	Graterford, US	monthly rain	114.3 mm (4.5 in)	12.2 mm (0.5 in)	37 years	34 of 100 (Routine)
12 September 1971	Graterford, US	daily rain	50.8 mm (2.0 in)	8.1 mm (0.32 in)	25 years	17 of 100 (Routine)
28 August 1971	Graterford, US	daily rain	122.4 mm (4.8 in)	89.1 mm (3.5 in)	30 years	54 of 100 (Notable)
27 August 1971	Graterford, US	daily rain	48.8 mm (1.9 in)	15.8 mm (0.6 in)	44 years	28 of 100 (Routine)
31 July 1971	Graterford, US	daily rain	44.5 mm (1.8 in)	1.1 mm (0.04 in)	30 years	14 of 100 (Routine)
14 May 1971	Graterford, US	daily rain	22.9 mm (0.9 in)	0.5 mm (0.02 in)	12 years	8 of 100 (Routine)
7 April 1971	Graterford, US	monthly rain	51.3 mm (2.0 in)	2.0 mm (0.08 in)	37 years	28 of 100 (Routine)
5 January 1971	Graterford, US	monthly rain	51.3 mm (2.0 in)	3.5 mm (0.14 in)	21 years	24 of 100 (Routine)
17 December 1970	Graterford, US	daily rain	29.7 mm (1.2 in)	6.3 mm (0.25 in)	33 years	20 of 100 (Routine)
11 November 1970	Graterford, US	daily rain	27.9 mm (1.1 in)	7.1 mm (0.28 in)	15 years	15 of 100 (Routine)
22 October 1970	Graterford, US	daily rain	41.9 mm (1.6 in)	9.6 mm (0.38 in)	40 years	24 of 100 (Routine)
16 October 1970	Graterford, US	daily rain	27.4 mm (1.1 in)	5.0 mm (0.20 in)	16 years	13 of 100 (Routine)
15 April 1970	Graterford, US	daily rain	34.3 mm (1.4 in)	15.5 mm (0.6 in)	24 years	29 of 100 (Routine)
2 April 1970	Graterford, US	daily rain	33.0 mm (1.3 in)	8.4 mm (0.33 in)	49 years	28 of 100 (Routine)
30 March 1970	Graterford, US	daily snowfall	7.6 cm (3.0 in)	6.3 cm (2.5 in)	11 years	16 of 100 (Routine)
29 March 1970	Graterford, US	daily snowfall	10.2 cm (4.0 in)	10.2 cm (4.0 in)	49 years	32 of 100 (Routine)
18 March 1970	Graterford, US	daily snowfall (Tie)	1.3 cm (0.5 in)	tie	15 years	2 of 100 (Routine)
10 February 1970	Graterford, US	daily rain	29.2 mm (1.1 in)	7.9 mm (0.31 in)	44 years	26 of 100 (Routine)
31 December 1969	Graterford, US	daily rain	44.5 mm (1.8 in)	14.8 mm (0.6 in)	20 years	25 of 100 (Routine)

Extremes by Year

1920 to 1972

Yearly extremes at Graterford: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	38.9 C (102.0 F)	1957	24.4 C (75.9 F)	3
Coldest night (TNn)	-22.2 C (-8.0 F)	1957	-14.4 C (6.1 F)	3
Wettest day (Rx1day)	144.0 mm (5.7 in)	1935	59.4 mm (2.3 in)	53
Wettest five days (Rx5day)	194.5 mm (7.7 in)	1933	90.5 mm (3.6 in)	53
Longest dry spell (CDD)	39 days	1924	18 days	53

Hottest day (TXx)

The hottest day of the year at Graterford, 1920 to 1972. The record is 38.9 C (102.0 F) in 1957, marked on the chart; the median year is 24.4 C (75.9 F).

Hottest day (TXx) at Graterford by year
Year	Hottest day (TXx)
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	24.4 C (75.9 F)
1957	38.9 C (102.0 F)
1958	7.8 C (46.0 F)
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a

Coldest night (TNn)

The coldest night of the year at Graterford, 1920 to 1972. The record is -22.2 C (-8.0 F) in 1957, marked on the chart; the median year is -14.4 C (6.1 F).

Coldest night (TNn) at Graterford by year
Year	Coldest night (TNn)
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	-10.6 C (12.9 F)
1957	-22.2 C (-8.0 F)
1958	-14.4 C (6.1 F)
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a

Wettest day (Rx1day)

The wettest day of the year at Graterford, 1920 to 1972. The record is 144.0 mm (5.7 in) in 1935, marked on the chart; the median year is 59.4 mm (2.3 in).

Wettest day (Rx1day) at Graterford by year
Year	Wettest day (Rx1day)
1920	44.7 mm (1.8 in)
1921	49.5 mm (1.9 in)
1922	46.5 mm (1.8 in)
1923	31.0 mm (1.2 in)
1924	38.4 mm (1.5 in)
1925	45.2 mm (1.8 in)
1926	35.1 mm (1.4 in)
1927	63.0 mm (2.5 in)
1928	57.4 mm (2.3 in)
1929	75.4 mm (3.0 in)
1930	43.7 mm (1.7 in)
1931	102.6 mm (4.0 in)
1932	58.9 mm (2.3 in)
1933	98.0 mm (3.9 in)
1934	102.1 mm (4.0 in)
1935	144.0 mm (5.7 in)
1936	40.1 mm (1.6 in)
1937	41.1 mm (1.6 in)
1938	64.3 mm (2.5 in)
1939	62.5 mm (2.5 in)
1940	56.1 mm (2.2 in)
1941	71.4 mm (2.8 in)
1942	122.7 mm (4.8 in)
1943	48.8 mm (1.9 in)
1944	63.0 mm (2.5 in)
1945	66.0 mm (2.6 in)
1946	91.2 mm (3.6 in)
1947	41.1 mm (1.6 in)
1948	61.0 mm (2.4 in)
1949	67.1 mm (2.6 in)
1950	79.2 mm (3.1 in)
1951	46.7 mm (1.8 in)
1952	96.8 mm (3.8 in)
1953	55.1 mm (2.2 in)
1954	48.5 mm (1.9 in)
1955	75.9 mm (3.0 in)
1956	51.6 mm (2.0 in)
1957	65.3 mm (2.6 in)
1958	78.2 mm (3.1 in)
1959	102.4 mm (4.0 in)
1960	46.5 mm (1.8 in)
1961	56.9 mm (2.2 in)
1962	35.3 mm (1.4 in)
1963	88.9 mm (3.5 in)
1964	44.5 mm (1.8 in)
1965	52.1 mm (2.1 in)
1966	59.4 mm (2.3 in)
1967	61.0 mm (2.4 in)
1968	61.0 mm (2.4 in)
1969	81.3 mm (3.2 in)
1970	41.9 mm (1.6 in)
1971	122.4 mm (4.8 in)
1972	24.6 mm (1.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Graterford, 1920 to 1972. The record is 194.5 mm (7.7 in) in 1933, marked on the chart; the median year is 90.5 mm (3.6 in).

Wettest five days (Rx5day) at Graterford by year
Year	Wettest five days (Rx5day)
1920	77.5 mm (3.1 in)
1921	71.9 mm (2.8 in)
1922	66.9 mm (2.6 in)
1923	53.3 mm (2.1 in)
1924	63.0 mm (2.5 in)
1925	57.3 mm (2.3 in)
1926	82.9 mm (3.3 in)
1927	87.1 mm (3.4 in)
1928	77.7 mm (3.1 in)
1929	111.7 mm (4.4 in)
1930	55.3 mm (2.2 in)
1931	127.4 mm (5.0 in)
1932	74.7 mm (2.9 in)
1933	194.5 mm (7.7 in)
1934	76.0 mm (3.0 in)
1935	191.2 mm (7.5 in)
1936	67.0 mm (2.6 in)
1937	77.2 mm (3.0 in)
1938	128.3 mm (5.1 in)
1939	121.0 mm (4.8 in)
1940	82.5 mm (3.2 in)
1941	129.9 mm (5.1 in)
1942	131.6 mm (5.2 in)
1943	115.3 mm (4.5 in)
1944	112.3 mm (4.4 in)
1945	75.6 mm (3.0 in)
1946	130.1 mm (5.1 in)
1947	72.1 mm (2.8 in)
1948	92.2 mm (3.6 in)
1949	96.2 mm (3.8 in)
1950	97.2 mm (3.8 in)
1951	96.2 mm (3.8 in)
1952	151.7 mm (6.0 in)
1953	100.5 mm (4.0 in)
1954	64.0 mm (2.5 in)
1955	87.1 mm (3.4 in)
1956	66.0 mm (2.6 in)
1957	102.8 mm (4.0 in)
1958	119.1 mm (4.7 in)
1959	114.2 mm (4.5 in)
1960	59.0 mm (2.3 in)
1961	101.6 mm (4.0 in)
1962	83.9 mm (3.3 in)
1963	89.4 mm (3.5 in)
1964	50.9 mm (2.0 in)
1965	60.2 mm (2.4 in)
1966	116.8 mm (4.6 in)
1967	101.9 mm (4.0 in)
1968	90.5 mm (3.6 in)
1969	122.9 mm (4.8 in)
1970	90.6 mm (3.6 in)
1971	174.0 mm (6.9 in)
1972	35.5 mm (1.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Graterford, 1920 to 1972. The record is 39 days in 1924, marked on the chart; the median year is 18 days.

Longest dry spell (CDD) at Graterford by year
Year	Longest dry spell (CDD)
1920	17 days
1921	14 days
1922	15 days
1923	24 days
1924	39 days
1925	17 days
1926	19 days
1927	13 days
1928	18 days
1929	17 days
1930	23 days
1931	18 days
1932	21 days
1933	21 days
1934	16 days
1935	21 days
1936	16 days
1937	14 days
1938	16 days
1939	15 days
1940	19 days
1941	21 days
1942	20 days
1943	19 days
1944	24 days
1945	16 days
1946	16 days
1947	35 days
1948	12 days
1949	25 days
1950	18 days
1951	13 days
1952	17 days
1953	18 days
1954	15 days
1955	19 days
1956	13 days
1957	15 days
1958	22 days
1959	13 days
1960	9 days
1961	16 days
1962	20 days
1963	28 days
1964	20 days
1965	15 days
1966	18 days
1967	19 days
1968	26 days
1969	18 days
1970	11 days
1971	17 days
1972	5 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

43 years, 1921 to 1970

A day with at least 59.0 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 150.3 mm (5.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Graterford: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	59.0 mm (2.3 in)
5 years	80.0 mm (3.1 in)
10 years	95.1 mm (3.7 in)
25 years	115.9 mm (4.6 in)
50 years	132.6 mm (5.2 in)	Longer than the 43 years of record
100 years	150.3 mm (5.9 in)	Longer than the 43 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, 43 years of values from 1921 to 1970.

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: 144.0 mm (5.7 in) in 1935; 122.7 mm (4.8 in) in 1942; 102.6 mm (4.0 in) in 1931.

Download the Data

Data for Graterford standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Graterford 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 2026-10-15 (15 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).