Marcus Hook Weather Records (USC00365390)

Record envelope, standing records and threshold days for Marcus Hook (USC00365390), Pennsylvania, United States, with 95 years of record.

Key Facts for Marcus Hook

Marcus Hook (USC00365390) is a weather station in Pennsylvania, United States at 39.83 latitude and -75.43 longitude, 3 m (10 ft) above sea level.
The station reports from 1919 to 2013, 95 years of record.
1,464 records set at Marcus Hook still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Marcus Hook set a daily record precipitation of 92.7 mm (3.6 in) on 28 July 2013.

About the Station

Location: Pennsylvania, United States, 39.83 latitude, -75.43 longitude.
Elevation: 3 m (10 ft).
Period of record: 1919 to 2013, 95 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.

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 Marcus Hook. 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 Marcus Hook, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	23.9 C (75.0 F)	-20.0 C (-4.0 F)	n/a	n/a
Feb	23.9 C (75.0 F)	-24.4 C (-11.9 F)	n/a	n/a
Mar	32.8 C (91.0 F)	-12.2 C (10.0 F)	n/a	n/a
Apr	35.0 C (95.0 F)	-11.7 C (10.9 F)	n/a	n/a
May	38.9 C (102.0 F)	1.7 C (35.1 F)	n/a	n/a
Jun	40.0 C (104.0 F)	7.2 C (45.0 F)	n/a	n/a
Jul	42.2 C (108.0 F)	12.2 C (54.0 F)	n/a	n/a
Aug	41.1 C (106.0 F)	8.9 C (48.0 F)	n/a	n/a
Sep	38.3 C (100.9 F)	3.9 C (39.0 F)	n/a	n/a
Oct	36.1 C (97.0 F)	-1.7 C (28.9 F)	n/a	n/a
Nov	30.6 C (87.1 F)	-10.6 C (12.9 F)	n/a	n/a
Dec	23.3 C (73.9 F)	-16.1 C (3.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Marcus Hook still stand. 1945 holds the most, with 44.

Standing records at Marcus Hook by the year they were set
Year set	Standing records
1919	16
1920	39
1921	28
1922	21
1923	38
1930	7
1931	20
1932	22
1933	26
1934	24
1935	18
1936	28
1937	14
1938	26
1939	24
1940	33
1941	30
1942	21
1943	23
1944	15
1945	44
1946	40
1947	24
1948	15
1949	15
1950	18
1951	13
1952	5
1953	15
1954	15
1955	19
1956	23
1957	16
1958	10
1959	17
1960	16
1961	6
1962	18
1963	21
1964	19
1965	16
1966	17
1967	24
1968	7
1969	10
1970	11
1971	13
1972	22
1973	14
1974	18
1975	8
1976	15
1977	13
1978	5
1979	25
1980	11
1981	8
1982	17
1983	16
1984	20
1985	18
1986	11
1987	9
1988	12
1989	20
1990	16
1991	12
1992	9
1993	15
1994	10
1995	9
1996	14
1997	9
1998	11
1999	6
2000	18
2001	12
2002	29
2003	6
2004	8
2005	10
2006	15
2008	7
2009	8
2010	10
2011	11
2012	10
2013	7

All-Time Record Progression

5 new records

5 all-time records were set at Marcus Hook between 11 February 1983 and 16 September 1999. Each dot is a new record.

When Marcus Hook set new all-time records
Date	Kind	Detail
1983-02-11	Record daily snowfall	Record daily snowfall 35.6 cm (14.0 in)
1983-12-25	Record low maximum temperature	Record low maximum temperature -11.1 C (12.0 F)
1985-01-21	Record low maximum temperature	Record low maximum temperature -12.2 C (10.0 F)
1994-01-19	Record low maximum temperature	Record low maximum temperature -15.0 C (5.0 F)
1999-09-16	Record daily precipitation	Record daily precipitation 296.7 mm (11.7 in)

Wettest Day of Each Month

Sep: 296.7 mm (11.7 in)

The wettest day on record for each calendar month at Marcus Hook. The most was 296.7 mm (11.7 in) on 16 September 1999.

Record daily precipitation for each month at Marcus Hook
Month	Record daily precipitation (mm)	Date
Jan	69.6 mm (2.7 in)	3 January 1936
Feb	66.8 mm (2.6 in)	20 February 1981
Mar	83.1 mm (3.3 in)	4 March 1940
Apr	89.9 mm (3.5 in)	2 April 2005
May	120.7 mm (4.8 in)	4 May 1934
Jun	123.4 mm (4.9 in)	28 June 1938
Jul	190.5 mm (7.5 in)	5 July 1989
Aug	150.9 mm (5.9 in)	14 August 1942
Sep	296.7 mm (11.7 in)	16 September 1999
Oct	117.9 mm (4.6 in)	8 October 2005
Nov	118.1 mm (4.6 in)	25 November 1950
Dec	59.7 mm (2.4 in)	13 December 1941

Period of Record Coverage

1919 to 2013

89 years of record at Marcus Hook, 1919 to 2013. 23 years have data for under 90 percent of days and are left out of rankings: 1919, 1930, 1931, 1933, 1934, 1935, 1936, 1937 and others.

Days with data per year at Marcus Hook
Year	Days with data	Share of year	Complete
1919	144	39%	No
1920	350	96%	Yes
1921	360	99%	Yes
1922	365	100%	Yes
1923	364	100%	Yes
1930	84	23%	No
1931	289	79%	No
1932	341	93%	Yes
1933	316	87%	No
1934	313	86%	No
1935	273	75%	No
1936	285	78%	No
1937	287	79%	No
1938	284	78%	No
1939	289	79%	No
1940	305	83%	No
1941	342	94%	Yes
1942	360	99%	Yes
1943	365	100%	Yes
1944	363	99%	Yes
1945	349	96%	Yes
1946	353	97%	Yes
1947	347	95%	Yes
1948	352	96%	Yes
1949	365	100%	Yes
1950	364	100%	Yes
1951	364	100%	Yes
1952	366	100%	Yes
1953	363	99%	Yes
1954	365	100%	Yes
1955	363	99%	Yes
1956	365	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	364	100%	Yes
1960	366	100%	Yes
1961	364	100%	Yes
1962	364	100%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	334	92%	Yes
1966	303	83%	No
1967	364	100%	Yes
1968	336	92%	Yes
1969	365	100%	Yes
1970	364	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	334	92%	Yes
1974	364	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	364	100%	Yes
1980	364	99%	Yes
1981	362	99%	Yes
1982	350	96%	Yes
1983	350	96%	Yes
1984	356	97%	Yes
1985	356	98%	Yes
1986	351	96%	Yes
1987	356	98%	Yes
1988	140	38%	No
1989	342	94%	Yes
1990	341	93%	Yes
1991	317	87%	No
1992	296	81%	No
1993	320	88%	No
1994	351	96%	Yes
1995	172	47%	No
1996	356	97%	Yes
1997	350	96%	Yes
1998	357	98%	Yes
1999	353	97%	Yes
2000	352	96%	Yes
2001	327	90%	No
2002	351	96%	Yes
2003	326	89%	No
2004	327	89%	No
2005	352	96%	Yes
2006	360	99%	Yes
2007	61	17%	No
2008	329	90%	No
2009	362	99%	Yes
2010	365	100%	Yes
2011	365	100%	Yes
2012	366	100%	Yes
2013	272	75%	No

Latest Records

Latest records at Marcus Hook
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
28 July 2013	Marcus Hook, US	daily rain	92.7 mm (3.6 in)	5.6 mm (0.22 in)	44 years	25 of 100 (Routine)
23 July 2013	Marcus Hook, US	daily rain	68.3 mm (2.7 in)	14.5 mm (0.6 in)	16 years	20 of 100 (Routine)
19 July 2013	Marcus Hook, US	daily high min	27.8 C (82.0 F)	0.6 C (1.1 F)	67 years	31 of 100 (Routine)
19 July 2013	Marcus Hook, US	daily high max (Tie)	38.3 C (100.9 F)	tie	72 years	7 of 100 (Routine)
18 July 2013	Marcus Hook, US	daily high max	39.4 C (102.9 F)	0.5 C (0.9 F)	0 years	10 of 100 (Routine)
17 July 2013	Marcus Hook, US	daily high max	38.3 C (100.9 F)	0.5 C (0.9 F)	36 years	20 of 100 (Routine)
15 July 2013	Marcus Hook, US	daily high max (Tie)	37.8 C (100.0 F)	tie	36 years	4 of 100 (Routine)
7 June 2013	Marcus Hook, US	daily rain	74.9 mm (2.9 in)	35.8 mm (1.4 in)	24 years	43 of 100 (Notable)
3 June 2013	Marcus Hook, US	daily rain	26.9 mm (1.1 in)	1.2 mm (0.05 in)	7 years	11 of 100 (Routine)
15 May 2013	Marcus Hook, US	daily low min	6.1 C (43.0 F)	0.6 C (1.1 F)	92 years	37 of 100 (Notable)
14 May 2013	Marcus Hook, US	daily low min	4.4 C (39.9 F)	0.6 C (1.1 F)	16 years	15 of 100 (Routine)
10 April 2013	Marcus Hook, US	daily high max	32.8 C (91.0 F)	1.7 C (3.1 F)	91 years	39 of 100 (Notable)
9 April 2013	Marcus Hook, US	daily high max	30.0 C (86.0 F)	0.6 C (1.1 F)	54 years	26 of 100 (Routine)
16 January 2013	Marcus Hook, US	daily rain	21.1 mm (0.8 in)	1.3 mm (0.05 in)	22 years	16 of 100 (Routine)
3 December 2012	Marcus Hook, US	daily high max (Tie)	20.6 C (69.1 F)	tie	80 years	8 of 100 (Routine)
29 October 2012	Marcus Hook, US	daily rain	77.2 mm (3.0 in)	28.9 mm (1.1 in)	65 years	48 of 100 (Notable)
4 September 2012	Marcus Hook, US	daily rain	56.6 mm (2.2 in)	37.8 mm (1.5 in)	49 years	39 of 100 (Notable)
18 July 2012	Marcus Hook, US	daily high max	38.9 C (102.0 F)	1.1 C (2.0 F)	35 years	22 of 100 (Routine)
8 July 2012	Marcus Hook, US	daily high min (Tie)	26.7 C (80.1 F)	tie	81 years	8 of 100 (Routine)
7 July 2012	Marcus Hook, US	daily high max (Tie)	39.4 C (102.9 F)	tie	26 years	4 of 100 (Routine)

Climate Trend

69 complete years, 1920 to 2012

One stripe for each of 69 complete years at Marcus Hook, 1920 to 2012. Blue stripes are years cooler than the station's own mean of 13.7 C (56.6 F); red stripes are warmer. The coolest year was 1967, at 12.1 C (53.8 F), and the warmest was 1946, at 15.6 C (60.2 F). The strongest colour marks a difference of 2.0 C (3.6 F).

Annual mean temperature at Marcus Hook as warming stripes, 1920 to 2012
Year	Annual mean temperature	Difference from the station mean
1920	12.9 C	-0.75 C
1921	13.7 C	-0.01 C
1922	12.7 C	-0.92 C
1923	12.9 C	-0.72 C
1932	14.3 C	+0.62 C
1934	13.8 C	+0.16 C
1936	14.4 C	+0.76 C
1937	14.7 C	+1.01 C
1938	15.0 C	+1.37 C
1939	14.9 C	+1.27 C
1940	13.2 C	-0.48 C
1941	14.3 C	+0.66 C
1942	14.0 C	+0.32 C
1943	13.6 C	-0.04 C
1944	14.1 C	+0.42 C
1945	14.4 C	+0.78 C
1946	15.6 C	+1.98 C
1947	13.8 C	+0.09 C
1948	13.8 C	+0.14 C
1949	14.8 C	+1.09 C
1950	13.1 C	-0.60 C
1951	13.5 C	-0.21 C
1952	14.1 C	+0.39 C
1953	14.3 C	+0.60 C
1954	13.5 C	-0.20 C
1955	13.4 C	-0.29 C
1956	12.7 C	-1.01 C
1957	13.9 C	+0.24 C
1958	12.5 C	-1.21 C
1959	13.5 C	-0.13 C
1960	12.7 C	-0.92 C
1961	13.3 C	-0.41 C
1962	12.6 C	-1.11 C
1963	12.5 C	-1.21 C
1964	13.1 C	-0.60 C
1967	12.1 C	-1.57 C
1969	12.5 C	-1.20 C
1970	12.5 C	-1.17 C
1971	13.1 C	-0.53 C
1972	13.0 C	-0.65 C
1974	13.6 C	-0.11 C
1975	14.1 C	+0.41 C
1976	13.5 C	-0.20 C
1977	14.0 C	+0.32 C
1978	13.1 C	-0.54 C
1979	13.4 C	-0.30 C
1980	13.7 C	+0.01 C
1981	13.5 C	-0.18 C
1982	13.4 C	-0.22 C
1983	14.0 C	+0.37 C
1984	13.7 C	+0.07 C
1985	14.0 C	+0.31 C
1986	13.6 C	-0.02 C
1987	13.7 C	+0.01 C
1989	12.3 C	-1.39 C
1990	14.2 C	+0.49 C
1994	13.2 C	-0.48 C
1996	12.5 C	-1.18 C
1997	13.1 C	-0.61 C
1998	14.8 C	+1.12 C
1999	14.2 C	+0.50 C
2000	13.3 C	-0.32 C
2002	14.6 C	+0.89 C
2005	14.1 C	+0.46 C
2006	14.8 C	+1.17 C
2009	13.6 C	-0.08 C
2010	14.5 C	+0.79 C
2011	14.5 C	+0.85 C
2012	15.5 C	+1.82 C

The fitted trend in annual mean temperature here over 1920 to 2012 is 0.02 C (-0.06 to 0.10) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.04 F (-0.10 to 0.17) per decade. The slope is a straight line fitted to 69 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Marcus Hook
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.02 C (-0.06 to 0.10) per decade	0.04 F (-0.10 to 0.17) per decade	1920 to 2012	69	Not clearly different from zero
Mean daily maximum	-0.14 C (-0.24 to -0.03) per decade	-0.2 F (-0.4 to -0.1) per decade	1920 to 2012	69	Fall
Mean daily minimum	0.2 C (0.1 to 0.2) per decade	0.3 F (0.2 to 0.4) per decade	1920 to 2012	69	Rise

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

1919 to 2013

Yearly extremes at Marcus Hook: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	42.2 C (108.0 F)	1936	37.2 C (99.0 F)	89
Coldest night (TNn)	-24.4 C (-11.9 F)	1934	-12.8 C (9.0 F)	89
Wettest day (Rx1day)	296.7 mm (11.7 in)	1999	64.0 mm (2.5 in)	89
Wettest five days (Rx5day)	308.1 mm (12.1 in)	1999	95.7 mm (3.8 in)	89
Longest dry spell (CDD)	67 days	1986	20 days	89

Hottest day (TXx)

The hottest day of the year at Marcus Hook, 1919 to 2013. The record is 42.2 C (108.0 F) in 1936, marked on the chart; the median year is 37.2 C (99.0 F).

Hottest day (TXx) at Marcus Hook by year
Year	Hottest day (TXx)
1919	37.2 C (99.0 F)
1920	36.7 C (98.1 F)
1921	36.7 C (98.1 F)
1922	36.7 C (98.1 F)
1923	37.8 C (100.0 F)
1930	29.4 C (84.9 F)
1931	38.3 C (100.9 F)
1932	38.3 C (100.9 F)
1933	38.3 C (100.9 F)
1934	40.0 C (104.0 F)
1935	36.1 C (97.0 F)
1936	42.2 C (108.0 F)
1937	38.3 C (100.9 F)
1938	37.8 C (100.0 F)
1939	38.3 C (100.9 F)
1940	40.6 C (105.1 F)
1941	40.0 C (104.0 F)
1942	38.3 C (100.9 F)
1943	37.8 C (100.0 F)
1944	39.4 C (102.9 F)
1945	39.4 C (102.9 F)
1946	38.3 C (100.9 F)
1947	37.8 C (100.0 F)
1948	41.1 C (106.0 F)
1949	38.9 C (102.0 F)
1950	36.1 C (97.0 F)
1951	33.9 C (93.0 F)
1952	37.8 C (100.0 F)
1953	39.4 C (102.9 F)
1954	36.7 C (98.1 F)
1955	37.8 C (100.0 F)
1956	36.7 C (98.1 F)
1957	39.4 C (102.9 F)
1958	35.6 C (96.1 F)
1959	37.8 C (100.0 F)
1960	34.4 C (93.9 F)
1961	36.1 C (97.0 F)
1962	37.2 C (99.0 F)
1963	36.7 C (98.1 F)
1964	36.7 C (98.1 F)
1965	33.9 C (93.0 F)
1966	38.9 C (102.0 F)
1967	32.8 C (91.0 F)
1968	35.6 C (96.1 F)
1969	33.9 C (93.0 F)
1970	33.3 C (91.9 F)
1971	34.4 C (93.9 F)
1972	37.8 C (100.0 F)
1973	38.3 C (100.9 F)
1974	37.2 C (99.0 F)
1975	37.8 C (100.0 F)
1976	36.7 C (98.1 F)
1977	38.3 C (100.9 F)
1978	37.8 C (100.0 F)
1979	36.7 C (98.1 F)
1980	38.3 C (100.9 F)
1981	37.8 C (100.0 F)
1982	36.7 C (98.1 F)
1983	37.8 C (100.0 F)
1984	37.8 C (100.0 F)
1985	35.6 C (96.1 F)
1986	39.4 C (102.9 F)
1987	39.4 C (102.9 F)
1988	24.4 C (75.9 F)
1989	37.2 C (99.0 F)
1990	37.8 C (100.0 F)
1991	37.8 C (100.0 F)
1992	35.0 C (95.0 F)
1993	36.7 C (98.1 F)
1994	36.7 C (98.1 F)
1995	29.4 C (84.9 F)
1996	35.0 C (95.0 F)
1997	36.1 C (97.0 F)
1998	35.0 C (95.0 F)
1999	37.8 C (100.0 F)
2000	33.9 C (93.0 F)
2001	36.7 C (98.1 F)
2002	36.7 C (98.1 F)
2003	34.4 C (93.9 F)
2004	33.9 C (93.0 F)
2005	36.7 C (98.1 F)
2006	37.8 C (100.0 F)
2007	21.7 C (71.1 F)
2008	36.7 C (98.1 F)
2009	36.1 C (97.0 F)
2010	40.6 C (105.1 F)
2011	40.0 C (104.0 F)
2012	39.4 C (102.9 F)
2013	39.4 C (102.9 F)

Coldest night (TNn)

The coldest night of the year at Marcus Hook, 1919 to 2013. The record is -24.4 C (-11.9 F) in 1934, marked on the chart; the median year is -12.8 C (9.0 F).

Coldest night (TNn) at Marcus Hook by year
Year	Coldest night (TNn)
1919	-2.8 C (27.0 F)
1920	-17.2 C (1.0 F)
1921	-13.3 C (8.1 F)
1922	-16.1 C (3.0 F)
1923	-14.4 C (6.1 F)
1930	-11.1 C (12.0 F)
1931	-9.4 C (15.1 F)
1932	-10.6 C (12.9 F)
1933	-16.1 C (3.0 F)
1934	-24.4 C (-11.9 F)
1935	-18.3 C (-0.9 F)
1936	-17.2 C (1.0 F)
1937	-7.8 C (18.0 F)
1938	-12.2 C (10.0 F)
1939	-10.6 C (12.9 F)
1940	-13.3 C (8.1 F)
1941	-10.0 C (14.0 F)
1942	-15.6 C (3.9 F)
1943	-14.4 C (6.1 F)
1944	-11.1 C (12.0 F)
1945	-15.0 C (5.0 F)
1946	-10.0 C (14.0 F)
1947	-13.9 C (7.0 F)
1948	-14.4 C (6.1 F)
1949	-7.2 C (19.0 F)
1950	-11.7 C (10.9 F)
1951	-12.2 C (10.0 F)
1952	-11.7 C (10.9 F)
1953	-8.3 C (17.1 F)
1954	-12.2 C (10.0 F)
1955	-14.4 C (6.1 F)
1956	-8.3 C (17.1 F)
1957	-15.6 C (3.9 F)
1958	-14.4 C (6.1 F)
1959	-13.9 C (7.0 F)
1960	-12.8 C (9.0 F)
1961	-16.7 C (1.9 F)
1962	-16.1 C (3.0 F)
1963	-15.6 C (3.9 F)
1964	-11.7 C (10.9 F)
1965	-14.4 C (6.1 F)
1966	-14.4 C (6.1 F)
1967	-12.8 C (9.0 F)
1968	-13.9 C (7.0 F)
1969	-11.1 C (12.0 F)
1970	-16.1 C (3.0 F)
1971	-13.9 C (7.0 F)
1972	-13.9 C (7.0 F)
1973	-12.2 C (10.0 F)
1974	-10.6 C (12.9 F)
1975	-8.3 C (17.1 F)
1976	-13.3 C (8.1 F)
1977	-16.7 C (1.9 F)
1978	-11.7 C (10.9 F)
1979	-17.2 C (1.0 F)
1980	-15.6 C (3.9 F)
1981	-15.0 C (5.0 F)
1982	-18.9 C (-2.0 F)
1983	-16.1 C (3.0 F)
1984	-14.4 C (6.1 F)
1985	-18.9 C (-2.0 F)
1986	-11.1 C (12.0 F)
1987	-12.8 C (9.0 F)
1988	-13.3 C (8.1 F)
1989	-13.3 C (8.1 F)
1990	-11.1 C (12.0 F)
1991	-11.1 C (12.0 F)
1992	-10.6 C (12.9 F)
1993	-13.3 C (8.1 F)
1994	-20.0 C (-4.0 F)
1995	-14.4 C (6.1 F)
1996	-14.4 C (6.1 F)
1997	-11.7 C (10.9 F)
1998	-6.7 C (19.9 F)
1999	-11.1 C (12.0 F)
2000	-12.8 C (9.0 F)
2001	-6.7 C (19.9 F)
2002	-6.1 C (21.0 F)
2003	-11.1 C (12.0 F)
2004	-15.0 C (5.0 F)
2005	-13.3 C (8.1 F)
2006	-8.9 C (16.0 F)
2007	-6.1 C (21.0 F)
2008	-11.1 C (12.0 F)
2009	-12.8 C (9.0 F)
2010	-10.0 C (14.0 F)
2011	-12.2 C (10.0 F)
2012	-9.4 C (15.1 F)
2013	-10.0 C (14.0 F)

Wettest day (Rx1day)

The wettest day of the year at Marcus Hook, 1919 to 2013. The record is 296.7 mm (11.7 in) in 1999, marked on the chart; the median year is 64.0 mm (2.5 in).

Wettest day (Rx1day) at Marcus Hook by year
Year	Wettest day (Rx1day)
1919	80.5 mm (3.2 in)
1920	50.3 mm (2.0 in)
1921	51.3 mm (2.0 in)
1922	36.8 mm (1.4 in)
1923	75.2 mm (3.0 in)
1930	54.9 mm (2.2 in)
1931	41.9 mm (1.6 in)
1932	54.9 mm (2.2 in)
1933	105.4 mm (4.1 in)
1934	120.7 mm (4.8 in)
1935	215.9 mm (8.5 in)
1936	69.6 mm (2.7 in)
1937	70.4 mm (2.8 in)
1938	123.4 mm (4.9 in)
1939	116.3 mm (4.6 in)
1940	83.1 mm (3.3 in)
1941	59.7 mm (2.4 in)
1942	150.9 mm (5.9 in)
1943	58.2 mm (2.3 in)
1944	71.1 mm (2.8 in)
1945	68.6 mm (2.7 in)
1946	63.5 mm (2.5 in)
1947	102.9 mm (4.1 in)
1948	50.8 mm (2.0 in)
1949	48.5 mm (1.9 in)
1950	118.1 mm (4.6 in)
1951	42.9 mm (1.7 in)
1952	104.6 mm (4.1 in)
1953	52.8 mm (2.1 in)
1954	48.3 mm (1.9 in)
1955	69.3 mm (2.7 in)
1956	56.4 mm (2.2 in)
1957	45.7 mm (1.8 in)
1958	69.3 mm (2.7 in)
1959	67.6 mm (2.7 in)
1960	142.7 mm (5.6 in)
1961	59.4 mm (2.3 in)
1962	59.9 mm (2.4 in)
1963	45.7 mm (1.8 in)
1964	45.0 mm (1.8 in)
1965	55.6 mm (2.2 in)
1966	85.9 mm (3.4 in)
1967	72.6 mm (2.9 in)
1968	68.6 mm (2.7 in)
1969	93.2 mm (3.7 in)
1970	59.2 mm (2.3 in)
1971	204.0 mm (8.0 in)
1972	94.7 mm (3.7 in)
1973	105.2 mm (4.1 in)
1974	75.2 mm (3.0 in)
1975	84.3 mm (3.3 in)
1976	51.6 mm (2.0 in)
1977	100.3 mm (3.9 in)
1978	110.0 mm (4.3 in)
1979	50.8 mm (2.0 in)
1980	88.6 mm (3.5 in)
1981	66.8 mm (2.6 in)
1982	49.5 mm (1.9 in)
1983	55.9 mm (2.2 in)
1984	61.0 mm (2.4 in)
1985	65.5 mm (2.6 in)
1986	45.7 mm (1.8 in)
1987	63.2 mm (2.5 in)
1988	53.8 mm (2.1 in)
1989	190.5 mm (7.5 in)
1990	50.8 mm (2.0 in)
1991	55.1 mm (2.2 in)
1992	28.4 mm (1.1 in)
1993	51.1 mm (2.0 in)
1994	59.9 mm (2.4 in)
1995	43.9 mm (1.7 in)
1996	56.1 mm (2.2 in)
1997	53.8 mm (2.1 in)
1998	34.0 mm (1.3 in)
1999	296.7 mm (11.7 in)
2000	52.3 mm (2.1 in)
2001	86.6 mm (3.4 in)
2002	57.7 mm (2.3 in)
2003	57.7 mm (2.3 in)
2004	174.2 mm (6.9 in)
2005	117.9 mm (4.6 in)
2006	86.4 mm (3.4 in)
2007	21.3 mm (0.8 in)
2008	64.0 mm (2.5 in)
2009	48.8 mm (1.9 in)
2010	134.4 mm (5.3 in)
2011	74.4 mm (2.9 in)
2012	77.2 mm (3.0 in)
2013	92.7 mm (3.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Marcus Hook, 1919 to 2013. The record is 308.1 mm (12.1 in) in 1999, marked on the chart; the median year is 95.7 mm (3.8 in).

Wettest five days (Rx5day) at Marcus Hook by year
Year	Wettest five days (Rx5day)
1919	215.4 mm (8.5 in)
1920	78.5 mm (3.1 in)
1921	70.3 mm (2.8 in)
1922	56.2 mm (2.2 in)
1923	88.0 mm (3.5 in)
1930	54.9 mm (2.2 in)
1931	90.9 mm (3.6 in)
1932	81.3 mm (3.2 in)
1933	157.5 mm (6.2 in)
1934	120.7 mm (4.8 in)
1935	237.7 mm (9.4 in)
1936	102.6 mm (4.0 in)
1937	98.9 mm (3.9 in)
1938	123.4 mm (4.9 in)
1939	116.3 mm (4.6 in)
1940	68.6 mm (2.7 in)
1941	62.4 mm (2.5 in)
1942	141.5 mm (5.6 in)
1943	87.9 mm (3.5 in)
1944	111.5 mm (4.4 in)
1945	94.6 mm (3.7 in)
1946	86.1 mm (3.4 in)
1947	125.1 mm (4.9 in)
1948	67.3 mm (2.6 in)
1949	104.0 mm (4.1 in)
1950	121.1 mm (4.8 in)
1951	79.7 mm (3.1 in)
1952	130.8 mm (5.1 in)
1953	98.0 mm (3.9 in)
1954	62.0 mm (2.4 in)
1955	100.3 mm (3.9 in)
1956	110.2 mm (4.3 in)
1957	68.9 mm (2.7 in)
1958	99.3 mm (3.9 in)
1959	135.3 mm (5.3 in)
1960	190.0 mm (7.5 in)
1961	93.4 mm (3.7 in)
1962	82.1 mm (3.2 in)
1963	106.6 mm (4.2 in)
1964	72.9 mm (2.9 in)
1965	57.1 mm (2.2 in)
1966	90.3 mm (3.6 in)
1967	116.5 mm (4.6 in)
1968	80.5 mm (3.2 in)
1969	134.4 mm (5.3 in)
1970	90.7 mm (3.6 in)
1971	303.8 mm (12.0 in)
1972	146.5 mm (5.8 in)
1973	123.0 mm (4.8 in)
1974	76.7 mm (3.0 in)
1975	122.0 mm (4.8 in)
1976	79.7 mm (3.1 in)
1977	131.8 mm (5.2 in)
1978	110.5 mm (4.4 in)
1979	101.0 mm (4.0 in)
1980	91.4 mm (3.6 in)
1981	86.3 mm (3.4 in)
1982	82.7 mm (3.3 in)
1983	68.6 mm (2.7 in)
1984	104.7 mm (4.1 in)
1985	116.3 mm (4.6 in)
1986	79.1 mm (3.1 in)
1987	110.2 mm (4.3 in)
1988	80.5 mm (3.2 in)
1989	205.0 mm (8.1 in)
1990	77.0 mm (3.0 in)
1991	77.2 mm (3.0 in)
1992	41.1 mm (1.6 in)
1993	55.4 mm (2.2 in)
1994	111.2 mm (4.4 in)
1995	47.2 mm (1.9 in)
1996	79.0 mm (3.1 in)
1997	95.7 mm (3.8 in)
1998	47.0 mm (1.9 in)
1999	308.1 mm (12.1 in)
2000	86.3 mm (3.4 in)
2001	103.6 mm (4.1 in)
2002	112.3 mm (4.4 in)
2003	94.0 mm (3.7 in)
2004	180.0 mm (7.1 in)
2005	92.7 mm (3.6 in)
2006	132.9 mm (5.2 in)
2007	23.4 mm (0.9 in)
2008	82.6 mm (3.3 in)
2009	89.6 mm (3.5 in)
2010	261.2 mm (10.3 in)
2011	111.3 mm (4.4 in)
2012	106.9 mm (4.2 in)
2013	118.8 mm (4.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Marcus Hook, 1919 to 2013. The record is 67 days in 1986, marked on the chart; the median year is 20 days.

Longest dry spell (CDD) at Marcus Hook by year
Year	Longest dry spell (CDD)
1919	11 days
1920	14 days
1921	16 days
1922	18 days
1923	25 days
1930	15 days
1931	25 days
1932	21 days
1933	18 days
1934	19 days
1935	17 days
1936	20 days
1937	11 days
1938	13 days
1939	26 days
1940	15 days
1941	28 days
1942	19 days
1943	19 days
1944	18 days
1945	13 days
1946	21 days
1947	32 days
1948	11 days
1949	20 days
1950	15 days
1951	12 days
1952	22 days
1953	18 days
1954	13 days
1955	22 days
1956	13 days
1957	15 days
1958	22 days
1959	25 days
1960	12 days
1961	15 days
1962	19 days
1963	28 days
1964	29 days
1965	16 days
1966	18 days
1967	19 days
1968	26 days
1969	20 days
1970	16 days
1971	20 days
1972	12 days
1973	18 days
1974	18 days
1975	13 days
1976	27 days
1977	22 days
1978	18 days
1979	14 days
1980	36 days
1981	37 days
1982	27 days
1983	19 days
1984	23 days
1985	20 days
1986	67 days
1987	27 days
1988	22 days
1989	13 days
1990	17 days
1991	25 days
1992	21 days
1993	17 days
1994	25 days
1995	23 days
1996	23 days
1997	42 days
1998	26 days
1999	36 days
2000	21 days
2001	31 days
2002	20 days
2003	23 days
2004	17 days
2005	43 days
2006	29 days
2007	5 days
2008	21 days
2009	24 days
2010	20 days
2011	16 days
2012	18 days
2013	13 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

69 years with a frost

Across 69 years with a frost, the median last spring frost at Marcus Hook falls on 31 March and the median first autumn frost on 16 November, which leaves a median of 230 days between them.

In 1972 to 2012 the median growing season was 236 days. That is 8 days more than in 1920 to 1959.

Fitted over all years, the growing season changes by +3.6 days per decade at this station.

Frost dates and growing season at Marcus Hook
Measure	Median, all years	Earliest period (1920 to 1959)	Recent period (1972 to 2012)	Recent against earliest	Fitted trend
Last spring frost	31 March	2 April	28 March	5 days earlier	-1.4 days per decade
First autumn frost	16 November	13 November	18 November	5 days later	+2.2 days per decade
Growing days	230 days	228 days	236 days	8 days more	+3.6 days per decade

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.

Rainfall Return Levels

73 years, 1920 to 2012

A day with at least 64.4 mm (2.5 in) of rain is expected about once in 2 years. A day with at least 267.1 mm (10.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Marcus Hook: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	64.4 mm (2.5 in)
5 years	92.3 mm (3.6 in)
10 years	118.4 mm (4.7 in)
25 years	163.5 mm (6.4 in)
50 years	208.8 mm (8.2 in)
100 years	267.1 mm (10.5 in)	Longer than the 73 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, 73 years of values from 1920 to 2012.

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: 296.7 mm (11.7 in) in 1999; 204.0 mm (8.0 in) in 1971; 190.5 mm (7.5 in) in 1989.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Download the Data

Data for Marcus Hook standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Marcus Hook 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 2026-10-13 (13 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).