Philadelphia Drexel Un Weather Records (USC00366879)

Record envelope, standing records and threshold days for Philadelphia Drexel Un (USC00366879), Pennsylvania, United States, with 38 years of record.

Key Facts for Philadelphia Drexel Un

Philadelphia Drexel Un (USC00366879) is a weather station in Pennsylvania, United States at 39.95 latitude and -75.18 longitude, 9 m (30 ft) above sea level.
The station reports from 1948 to 1985, 38 years of record.
1,464 records set at Philadelphia Drexel Un still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Philadelphia Drexel Un set a daily record precipitation of 48.8 mm (1.9 in) on 27 September 1985.

About the Station

Location: Pennsylvania, United States, 39.95 latitude, -75.18 longitude.
Elevation: 9 m (30 ft).
Period of record: 1948 to 1985, 38 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 Philadelphia Drexel Un. 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 Drexel Un, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	22.2 C (72.0 F)	-20.6 C (-5.1 F)	n/a	n/a
Feb	23.3 C (73.9 F)	-17.8 C (0.0 F)	n/a	n/a
Mar	28.3 C (82.9 F)	-12.8 C (9.0 F)	n/a	n/a
Apr	35.0 C (95.0 F)	-7.2 C (19.0 F)	n/a	n/a
May	36.1 C (97.0 F)	0.6 C (33.1 F)	n/a	n/a
Jun	38.9 C (102.0 F)	7.2 C (45.0 F)	n/a	n/a
Jul	40.6 C (105.1 F)	12.2 C (54.0 F)	n/a	n/a
Aug	39.4 C (102.9 F)	8.9 C (48.0 F)	n/a	n/a
Sep	38.3 C (100.9 F)	5.0 C (41.0 F)	n/a	n/a
Oct	32.2 C (90.0 F)	-0.6 C (30.9 F)	n/a	n/a
Nov	29.4 C (84.9 F)	-8.9 C (16.0 F)	n/a	n/a
Dec	22.8 C (73.0 F)	-17.8 C (0.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Philadelphia Drexel Un still stand. 1959 holds the most, with 61.

Standing records at Philadelphia Drexel Un by the year they were set
Year set	Standing records
1948	16
1949	47
1950	55
1951	47
1952	28
1953	44
1954	31
1955	40
1956	42
1957	55
1958	25
1959	61
1960	55
1961	33
1962	49
1963	57
1964	45
1965	41
1966	36
1967	32
1968	27
1969	19
1970	33
1971	27
1972	41
1973	24
1974	32
1975	38
1976	50
1977	55
1978	35
1979	51
1980	23
1981	35
1982	39
1983	37
1984	35
1985	24

All-Time Record Progression

3 new records

3 all-time records were set at Philadelphia Drexel Un between 17 January 1982 and 11 February 1983. Each dot is a new record.

When Philadelphia Drexel Un set new all-time records
Date	Kind	Detail
1982-01-17	Record low minimum temperature	Record low minimum temperature -20.6 C (-5.1 F)
1983-02-11	Record daily snowfall	Record daily snowfall 48.3 cm (19.0 in)
1983-02-11	Record snow depth	Record snow depth 40.6 cm (16.0 in)

Wettest Day of Each Month

Aug: 146.6 mm (5.8 in)

The wettest day on record for each calendar month at Philadelphia Drexel Un. The most was 146.6 mm (5.8 in) on 27 August 1971.

Record daily precipitation for each month at Philadelphia Drexel Un
Month	Record daily precipitation (mm)	Date
Jan	55.4 mm (2.2 in)	6 January 1962
Feb	66.0 mm (2.6 in)	2 February 1967
Mar	56.1 mm (2.2 in)	7 March 1967
Apr	50.5 mm (2.0 in)	25 April 1975
May	76.7 mm (3.0 in)	22 May 1949
Jun	138.9 mm (5.5 in)	29 June 1973
Jul	108.7 mm (4.3 in)	30 July 1971
Aug	146.6 mm (5.8 in)	27 August 1971
Sep	143.5 mm (5.6 in)	12 September 1960
Oct	105.4 mm (4.1 in)	25 October 1980
Nov	108.0 mm (4.3 in)	7 November 1977
Dec	56.1 mm (2.2 in)	30 December 1948

Period of Record Coverage

1948 to 1985

38 years of record at Philadelphia Drexel Un, 1948 to 1985. 3 years have data for under 90 percent of days and are left out of rankings: 1948, 1973, 1985.

Days with data per year at Philadelphia Drexel Un
Year	Days with data	Share of year	Complete
1948	180	49%	No
1949	362	99%	Yes
1950	362	99%	Yes
1951	363	99%	Yes
1952	364	99%	Yes
1953	361	99%	Yes
1954	362	99%	Yes
1955	362	99%	Yes
1956	363	99%	Yes
1957	360	99%	Yes
1958	360	99%	Yes
1959	360	99%	Yes
1960	363	99%	Yes
1961	365	100%	Yes
1962	363	99%	Yes
1963	363	99%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	365	100%	Yes
1969	365	100%	Yes
1970	364	100%	Yes
1971	363	99%	Yes
1972	366	100%	Yes
1973	273	75%	No
1974	365	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	364	100%	Yes
1978	364	100%	Yes
1979	364	100%	Yes
1980	366	100%	Yes
1981	363	99%	Yes
1982	360	99%	Yes
1983	364	100%	Yes
1984	365	100%	Yes
1985	273	75%	No

Latest Records

Latest records at Philadelphia Drexel Un
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
27 September 1985	Philadelphia Drexel Un, US	daily rain	48.8 mm (1.9 in)	13.0 mm (0.5 in)	23 years	16 of 100 (Routine)
26 September 1985	Philadelphia Drexel Un, US	daily rain	73.7 mm (2.9 in)	34.8 mm (1.4 in)	10 years	26 of 100 (Routine)
15 September 1985	Philadelphia Drexel Un, US	daily low min (Tie)	9.4 C (48.9 F)	tie	10 years	1 of 100 (Routine)
14 September 1985	Philadelphia Drexel Un, US	daily low min (Tie)	8.9 C (48.0 F)	tie	32 years	3 of 100 (Routine)
13 September 1985	Philadelphia Drexel Un, US	daily low min (Tie)	8.9 C (48.0 F)	tie	27 years	2 of 100 (Routine)
9 September 1985	Philadelphia Drexel Un, US	daily high min	22.8 C (73.0 F)	0.6 C (1.1 F)	36 years	15 of 100 (Routine)
8 September 1985	Philadelphia Drexel Un, US	daily high max (Tie)	32.8 C (91.0 F)	tie	8 years	1 of 100 (Routine)
7 September 1985	Philadelphia Drexel Un, US	daily high max	34.4 C (93.9 F)	0.5 C (0.9 F)	31 years	13 of 100 (Routine)
7 September 1985	Philadelphia Drexel Un, US	daily high min	23.3 C (73.9 F)	0.5 C (0.9 F)	16 years	8 of 100 (Routine)
6 September 1985	Philadelphia Drexel Un, US	daily high min (Tie)	23.9 C (75.0 F)	tie	24 years	2 of 100 (Routine)
5 September 1985	Philadelphia Drexel Un, US	daily high min	24.4 C (75.9 F)	0.5 C (0.9 F)	24 years	11 of 100 (Routine)
5 September 1985	Philadelphia Drexel Un, US	daily high max (Tie)	33.3 C (91.9 F)	tie	2 years	0 of 100 (Routine)
15 August 1985	Philadelphia Drexel Un, US	daily high min	24.4 C (75.9 F)	0.5 C (0.9 F)	16 years	8 of 100 (Routine)
14 August 1985	Philadelphia Drexel Un, US	daily high max (Tie)	35.0 C (95.0 F)	tie	26 years	2 of 100 (Routine)
26 July 1985	Philadelphia Drexel Un, US	daily rain	33.8 mm (1.3 in)	20.6 mm (0.8 in)	22 years	20 of 100 (Routine)
24 July 1985	Philadelphia Drexel Un, US	daily low min	15.6 C (60.1 F)	1.1 C (2.0 F)	23 years	13 of 100 (Routine)
1 July 1985	Philadelphia Drexel Un, US	daily low max	26.1 C (79.0 F)	0.6 C (1.1 F)	6 years	5 of 100 (Routine)
1 July 1985	Philadelphia Drexel Un, US	daily low min (Tie)	15.6 C (60.1 F)	tie	32 years	3 of 100 (Routine)
28 June 1985	Philadelphia Drexel Un, US	daily low min	13.9 C (57.0 F)	0.5 C (0.9 F)	15 years	8 of 100 (Routine)
27 June 1985	Philadelphia Drexel Un, US	daily low min	13.3 C (55.9 F)	1.1 C (2.0 F)	24 years	13 of 100 (Routine)

Climate Trend

35 complete years, 1949 to 1984

One stripe for each of 35 complete years at Philadelphia Drexel Un, 1949 to 1984. Blue stripes are years cooler than the station's own mean of 13.2 C (55.8 F); red stripes are warmer. The coolest year was 1963, at 12.2 C (54.0 F), and the warmest was 1953, at 14.5 C (58.0 F). The strongest colour marks a difference of 1.3 C (2.3 F).

Annual mean temperature at Philadelphia Drexel Un as warming stripes, 1949 to 1984
Year	Annual mean temperature	Difference from the station mean
1949	14.1 C	+0.82 C
1950	12.8 C	-0.44 C
1951	13.6 C	+0.38 C
1952	14.0 C	+0.75 C
1953	14.5 C	+1.22 C
1954	13.6 C	+0.35 C
1955	13.7 C	+0.46 C
1956	13.5 C	+0.24 C
1957	14.0 C	+0.71 C
1958	12.6 C	-0.69 C
1959	13.9 C	+0.64 C
1960	12.8 C	-0.46 C
1961	12.7 C	-0.58 C
1962	12.2 C	-1.01 C
1963	12.2 C	-1.02 C
1964	13.2 C	-0.08 C
1965	12.4 C	-0.85 C
1966	12.6 C	-0.63 C
1967	12.7 C	-0.58 C
1968	13.2 C	-0.03 C
1969	13.4 C	+0.11 C
1970	13.0 C	-0.28 C
1971	13.5 C	+0.24 C
1972	12.9 C	-0.33 C
1974	13.7 C	+0.43 C
1975	14.2 C	+0.93 C
1976	13.0 C	-0.23 C
1977	13.2 C	-0.04 C
1978	12.5 C	-0.78 C
1979	13.3 C	+0.09 C
1980	13.6 C	+0.30 C
1981	13.2 C	-0.02 C
1982	13.3 C	+0.08 C
1983	13.7 C	+0.47 C
1984	12.9 C	-0.33 C

The fitted trend in annual mean temperature here over 1949 to 1984 is -0.1 C (-0.3 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.2 F (-0.5 to 0.2) per decade. The slope is a straight line fitted to 35 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Philadelphia Drexel Un
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	-0.1 C (-0.3 to 0.1) per decade	-0.2 F (-0.5 to 0.2) per decade	1949 to 1984	35	Not clearly different from zero
Mean daily maximum	-0.1 C (-0.3 to 0.1) per decade	-0.2 F (-0.5 to 0.2) per decade	1949 to 1984	35	Not clearly different from zero
Mean daily minimum	-0.1 C (-0.3 to 0.1) per decade	-0.2 F (-0.5 to 0.2) per decade	1949 to 1984	35	Not clearly different from zero

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

1948 to 1985

Yearly extremes at Philadelphia Drexel Un: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.6 C (105.1 F)	1966	36.7 C (98.1 F)	38
Coldest night (TNn)	-20.6 C (-5.1 F)	1982	-13.3 C (8.1 F)	38
Wettest day (Rx1day)	146.6 mm (5.8 in)	1971	69.4 mm (2.7 in)	38
Wettest five days (Rx5day)	209.0 mm (8.2 in)	1960	103.2 mm (4.1 in)	38
Longest dry spell (CDD)	37 days	1964	19 days	38

Hottest day (TXx)

The hottest day of the year at Philadelphia Drexel Un, 1948 to 1985. The record is 40.6 C (105.1 F) in 1966, marked on the chart; the median year is 36.7 C (98.1 F).

Hottest day (TXx) at Philadelphia Drexel Un by year
Year	Hottest day (TXx)
1948	38.3 C (100.9 F)
1949	37.2 C (99.0 F)
1950	34.4 C (93.9 F)
1951	35.6 C (96.1 F)
1952	38.3 C (100.9 F)
1953	39.4 C (102.9 F)
1954	40.0 C (104.0 F)
1955	39.4 C (102.9 F)
1956	36.7 C (98.1 F)
1957	38.9 C (102.0 F)
1958	35.6 C (96.1 F)
1959	38.3 C (100.9 F)
1960	35.6 C (96.1 F)
1961	35.0 C (95.0 F)
1962	36.1 C (97.0 F)
1963	37.8 C (100.0 F)
1964	38.9 C (102.0 F)
1965	34.4 C (93.9 F)
1966	40.6 C (105.1 F)
1967	34.4 C (93.9 F)
1968	36.7 C (98.1 F)
1969	36.1 C (97.0 F)
1970	36.1 C (97.0 F)
1971	36.1 C (97.0 F)
1972	36.1 C (97.0 F)
1973	37.8 C (100.0 F)
1974	36.1 C (97.0 F)
1975	37.8 C (100.0 F)
1976	35.6 C (96.1 F)
1977	39.4 C (102.9 F)
1978	37.2 C (99.0 F)
1979	35.0 C (95.0 F)
1980	39.4 C (102.9 F)
1981	36.7 C (98.1 F)
1982	35.6 C (96.1 F)
1983	38.3 C (100.9 F)
1984	36.1 C (97.0 F)
1985	35.0 C (95.0 F)

Coldest night (TNn)

The coldest night of the year at Philadelphia Drexel Un, 1948 to 1985. The record is -20.6 C (-5.1 F) in 1982, marked on the chart; the median year is -13.3 C (8.1 F).

Coldest night (TNn) at Philadelphia Drexel Un by year
Year	Coldest night (TNn)
1948	-10.6 C (12.9 F)
1949	-7.2 C (19.0 F)
1950	-11.7 C (10.9 F)
1951	-11.1 C (12.0 F)
1952	-11.7 C (10.9 F)
1953	-7.8 C (18.0 F)
1954	-11.1 C (12.0 F)
1955	-15.0 C (5.0 F)
1956	-8.9 C (16.0 F)
1957	-15.6 C (3.9 F)
1958	-14.4 C (6.1 F)
1959	-12.8 C (9.0 F)
1960	-13.3 C (8.1 F)
1961	-17.8 C (0.0 F)
1962	-16.1 C (3.0 F)
1963	-16.7 C (1.9 F)
1964	-12.8 C (9.0 F)
1965	-13.3 C (8.1 F)
1966	-13.3 C (8.1 F)
1967	-13.3 C (8.1 F)
1968	-13.3 C (8.1 F)
1969	-10.6 C (12.9 F)
1970	-15.6 C (3.9 F)
1971	-13.3 C (8.1 F)
1972	-13.9 C (7.0 F)
1973	-12.8 C (9.0 F)
1974	-10.6 C (12.9 F)
1975	-9.4 C (15.1 F)
1976	-13.3 C (8.1 F)
1977	-18.3 C (-0.9 F)
1978	-13.9 C (7.0 F)
1979	-17.8 C (0.0 F)
1980	-16.7 C (1.9 F)
1981	-15.6 C (3.9 F)
1982	-20.6 C (-5.1 F)
1983	-17.8 C (0.0 F)
1984	-16.1 C (3.0 F)
1985	-18.9 C (-2.0 F)

Wettest day (Rx1day)

The wettest day of the year at Philadelphia Drexel Un, 1948 to 1985. The record is 146.6 mm (5.8 in) in 1971, marked on the chart; the median year is 69.4 mm (2.7 in).

Wettest day (Rx1day) at Philadelphia Drexel Un by year
Year	Wettest day (Rx1day)
1948	56.1 mm (2.2 in)
1949	76.7 mm (3.0 in)
1950	100.3 mm (3.9 in)
1951	46.5 mm (1.8 in)
1952	60.5 mm (2.4 in)
1953	70.1 mm (2.8 in)
1954	48.8 mm (1.9 in)
1955	78.5 mm (3.1 in)
1956	68.6 mm (2.7 in)
1957	35.3 mm (1.4 in)
1958	53.8 mm (2.1 in)
1959	86.4 mm (3.4 in)
1960	143.5 mm (5.6 in)
1961	57.2 mm (2.3 in)
1962	67.6 mm (2.7 in)
1963	51.8 mm (2.0 in)
1964	75.7 mm (3.0 in)
1965	63.0 mm (2.5 in)
1966	95.3 mm (3.8 in)
1967	66.0 mm (2.6 in)
1968	124.5 mm (4.9 in)
1969	94.0 mm (3.7 in)
1970	48.8 mm (1.9 in)
1971	146.6 mm (5.8 in)
1972	96.5 mm (3.8 in)
1973	138.9 mm (5.5 in)
1974	46.2 mm (1.8 in)
1975	88.6 mm (3.5 in)
1976	66.0 mm (2.6 in)
1977	119.4 mm (4.7 in)
1978	77.2 mm (3.0 in)
1979	66.8 mm (2.6 in)
1980	105.4 mm (4.1 in)
1981	113.0 mm (4.4 in)
1982	54.4 mm (2.1 in)
1983	63.5 mm (2.5 in)
1984	46.5 mm (1.8 in)
1985	73.7 mm (2.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Philadelphia Drexel Un, 1948 to 1985. The record is 209.0 mm (8.2 in) in 1960, marked on the chart; the median year is 103.2 mm (4.1 in).

Wettest five days (Rx5day) at Philadelphia Drexel Un by year
Year	Wettest five days (Rx5day)
1948	80.8 mm (3.2 in)
1949	133.1 mm (5.2 in)
1950	102.8 mm (4.0 in)
1951	81.6 mm (3.2 in)
1952	109.0 mm (4.3 in)
1953	91.9 mm (3.6 in)
1954	72.1 mm (2.8 in)
1955	129.6 mm (5.1 in)
1956	131.6 mm (5.2 in)
1957	72.6 mm (2.9 in)
1958	91.4 mm (3.6 in)
1959	124.5 mm (4.9 in)
1960	209.0 mm (8.2 in)
1961	95.7 mm (3.8 in)
1962	100.5 mm (4.0 in)
1963	97.5 mm (3.8 in)
1964	94.3 mm (3.7 in)
1965	65.8 mm (2.6 in)
1966	110.8 mm (4.4 in)
1967	103.6 mm (4.1 in)
1968	158.3 mm (6.2 in)
1969	166.6 mm (6.6 in)
1970	76.5 mm (3.0 in)
1971	207.6 mm (8.2 in)
1972	118.7 mm (4.7 in)
1973	161.8 mm (6.4 in)
1974	78.2 mm (3.1 in)
1975	185.1 mm (7.3 in)
1976	76.5 mm (3.0 in)
1977	125.8 mm (5.0 in)
1978	91.6 mm (3.6 in)
1979	106.2 mm (4.2 in)
1980	109.0 mm (4.3 in)
1981	116.0 mm (4.6 in)
1982	88.1 mm (3.5 in)
1983	93.9 mm (3.7 in)
1984	100.8 mm (4.0 in)
1985	123.3 mm (4.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Philadelphia Drexel Un, 1948 to 1985. The record is 37 days in 1964, marked on the chart; the median year is 19 days.

Longest dry spell (CDD) at Philadelphia Drexel Un by year
Year	Longest dry spell (CDD)
1948	11 days
1949	22 days
1950	15 days
1951	12 days
1952	29 days
1953	21 days
1954	26 days
1955	28 days
1956	13 days
1957	24 days
1958	24 days
1959	25 days
1960	18 days
1961	16 days
1962	19 days
1963	32 days
1964	37 days
1965	26 days
1966	18 days
1967	19 days
1968	26 days
1969	19 days
1970	16 days
1971	20 days
1972	12 days
1973	22 days
1974	19 days
1975	12 days
1976	26 days
1977	26 days
1978	18 days
1979	14 days
1980	24 days
1981	24 days
1982	17 days
1983	19 days
1984	12 days
1985	19 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

35 years with a frost

Across 35 years with a frost, the median last spring frost at Philadelphia Drexel Un falls on 4 April and the median first autumn frost on 12 November, which leaves a median of 226 days between them.

Fitted over all years, the growing season changes by -5.0 days per decade at this station.

Frost dates and growing season at Philadelphia Drexel Un
Measure	Median, all years	Earliest period	Recent period (1954 to 1984)	Recent against earliest	Fitted trend
Last spring frost	4 April	n/a	5 April	n/a	+2.8 days per decade
First autumn frost	12 November	n/a	12 November	n/a	-2.3 days per decade
Growing days	226 days	n/a	226 days	n/a	-5.0 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

35 years, 1949 to 1984

A day with at least 71.4 mm (2.8 in) of rain is expected about once in 2 years. A day with at least 177.0 mm (7.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Philadelphia Drexel Un: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	71.4 mm (2.8 in)
5 years	96.9 mm (3.8 in)
10 years	114.8 mm (4.5 in)
25 years	138.7 mm (5.5 in)
50 years	157.5 mm (6.2 in)	Longer than the 35 years of record
100 years	177.0 mm (7.0 in)	Longer than the 35 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, 35 years of values from 1949 to 1984.

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: 146.6 mm (5.8 in) in 1971; 143.5 mm (5.6 in) in 1960; 124.5 mm (4.9 in) in 1968.

Download the Data

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