Portsmouth Weather Records (USC00376453)

Record envelope, standing records and threshold days for Portsmouth (USC00376453), Rhode Island, United States, with 47 years of record.

Key Facts for Portsmouth

Portsmouth (USC00376453) is a weather station in Rhode Island, United States at 41.53 latitude and -71.27 longitude, 69 m (225 ft) above sea level.
The station reports from 1900 to 1946, 47 years of record.
1,464 records set at Portsmouth still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Rhode Island, United States, 41.53 latitude, -71.27 longitude.
Elevation: 69 m (225 ft).
Period of record: 1900 to 1946, 47 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 Portsmouth. 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 Portsmouth, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	12.8 C (55.0 F)	-21.1 C (-6.0 F)	n/a	n/a
Feb	16.1 C (61.0 F)	-25.0 C (-13.0 F)	n/a	n/a
Mar	24.4 C (75.9 F)	-15.0 C (5.0 F)	n/a	n/a
Apr	30.0 C (86.0 F)	-7.2 C (19.0 F)	n/a	n/a
May	33.3 C (91.9 F)	-1.7 C (28.9 F)	n/a	n/a
Jun	35.0 C (95.0 F)	2.2 C (36.0 F)	n/a	n/a
Jul	35.0 C (95.0 F)	7.2 C (45.0 F)	n/a	n/a
Aug	34.4 C (93.9 F)	5.0 C (41.0 F)	n/a	n/a
Sep	32.2 C (90.0 F)	2.8 C (37.0 F)	n/a	n/a
Oct	30.6 C (87.1 F)	-4.4 C (24.1 F)	n/a	n/a
Nov	23.3 C (73.9 F)	-12.8 C (9.0 F)	n/a	n/a
Dec	16.7 C (62.1 F)	-22.8 C (-9.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Portsmouth still stand. 1903 holds the most, with 146.

Wettest Day of Each Month

Aug: 130.6 mm (5.1 in)

The wettest day on record for each calendar month at Portsmouth. The most was 130.6 mm (5.1 in) on 7 August 1946.

Record daily precipitation for each month at Portsmouth
Month	Record daily precipitation (mm)	Date
Jan	67.3 mm (2.6 in)	4 January 1944
Feb	50.8 mm (2.0 in)	22 February 1904
Mar	65.5 mm (2.6 in)	26 March 1901
Apr	74.2 mm (2.9 in)	28 April 1904
May	72.4 mm (2.9 in)	3 May 1900
Jun	72.4 mm (2.9 in)	28 June 1938
Jul	43.4 mm (1.7 in)	4 July 1940
Aug	130.6 mm (5.1 in)	7 August 1946
Sep	52.8 mm (2.1 in)	16 September 1900
Oct	74.2 mm (2.9 in)	14 October 1901
Nov	88.9 mm (3.5 in)	30 November 1945
Dec	85.6 mm (3.4 in)	7 December 1945

Period of Record Coverage

1900 to 1946

14 years of record at Portsmouth, 1900 to 1946. 4 years have data for under 90 percent of days and are left out of rankings: 1900, 1901, 1902, 1946.

Days with data per year at Portsmouth
Year	Days with data	Share of year	Complete
1900	266	73%	No
1901	269	74%	No
1902	327	90%	No
1903	363	99%	Yes
1904	363	99%	Yes
1938	364	100%	Yes
1939	360	99%	Yes
1940	363	99%	Yes
1941	355	97%	Yes
1942	365	100%	Yes
1943	359	98%	Yes
1944	333	91%	Yes
1945	364	100%	Yes
1946	272	75%	No

Latest Records

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

Extremes by Year

1900 to 1946

Yearly extremes at Portsmouth: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	35.0 C (95.0 F)	1903	34.2 C (93.5 F)	14
Coldest night (TNn)	-25.0 C (-13.0 F)	1943	-16.6 C (2.0 F)	14
Wettest day (Rx1day)	130.6 mm (5.1 in)	1946	69.4 mm (2.7 in)	14
Wettest five days (Rx5day)	149.2 mm (5.9 in)	1938	104.2 mm (4.1 in)	14
Longest dry spell (CDD)	24 days	1901	18 days	14

Hottest day (TXx)

The hottest day of the year at Portsmouth, 1900 to 1946. The record is 35.0 C (95.0 F) in 1903, marked on the chart; the median year is 34.2 C (93.5 F).

Hottest day (TXx) at Portsmouth by year
Year	Hottest day (TXx)
1900	34.4 C (93.9 F)
1901	31.7 C (89.1 F)
1902	32.8 C (91.0 F)
1903	35.0 C (95.0 F)
1904	34.4 C (93.9 F)
1938	33.9 C (93.0 F)
1939	33.3 C (91.9 F)
1940	35.0 C (95.0 F)
1941	33.3 C (91.9 F)
1942	32.2 C (90.0 F)
1943	35.0 C (95.0 F)
1944	34.4 C (93.9 F)
1945	34.4 C (93.9 F)
1946	31.7 C (89.1 F)

Coldest night (TNn)

The coldest night of the year at Portsmouth, 1900 to 1946. The record is -25.0 C (-13.0 F) in 1943, marked on the chart; the median year is -16.6 C (2.0 F).

Coldest night (TNn) at Portsmouth by year
Year	Coldest night (TNn)
1900	-13.3 C (8.1 F)
1901	-14.4 C (6.1 F)
1902	-15.6 C (3.9 F)
1903	-17.8 C (0.0 F)
1904	-21.1 C (-6.0 F)
1938	-15.6 C (3.9 F)
1939	-15.6 C (3.9 F)
1940	-16.1 C (3.0 F)
1941	-17.2 C (1.0 F)
1942	-22.8 C (-9.0 F)
1943	-25.0 C (-13.0 F)
1944	-15.0 C (5.0 F)
1945	-20.6 C (-5.1 F)
1946	-18.9 C (-2.0 F)

Wettest day (Rx1day)

The wettest day of the year at Portsmouth, 1900 to 1946. The record is 130.6 mm (5.1 in) in 1946, marked on the chart; the median year is 69.4 mm (2.7 in).

Wettest day (Rx1day) at Portsmouth by year
Year	Wettest day (Rx1day)
1900	72.4 mm (2.9 in)
1901	74.2 mm (2.9 in)
1902	50.8 mm (2.0 in)
1903	45.7 mm (1.8 in)
1904	74.2 mm (2.9 in)
1938	72.4 mm (2.9 in)
1939	71.4 mm (2.8 in)
1940	54.4 mm (2.1 in)
1941	63.0 mm (2.5 in)
1942	64.5 mm (2.5 in)
1943	36.1 mm (1.4 in)
1944	67.3 mm (2.6 in)
1945	88.9 mm (3.5 in)
1946	130.6 mm (5.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Portsmouth, 1900 to 1946. The record is 149.2 mm (5.9 in) in 1938, marked on the chart; the median year is 104.2 mm (4.1 in).

Wettest five days (Rx5day) at Portsmouth by year
Year	Wettest five days (Rx5day)
1900	84.3 mm (3.3 in)
1901	98.0 mm (3.9 in)
1902	73.2 mm (2.9 in)
1903	107.5 mm (4.2 in)
1904	110.1 mm (4.3 in)
1938	149.2 mm (5.9 in)
1939	100.9 mm (4.0 in)
1940	144.8 mm (5.7 in)
1941	97.0 mm (3.8 in)
1942	121.2 mm (4.8 in)
1943	53.6 mm (2.1 in)
1944	108.3 mm (4.3 in)
1945	90.2 mm (3.6 in)
1946	134.7 mm (5.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at Portsmouth, 1900 to 1946. The record is 24 days in 1901, marked on the chart; the median year is 18 days.

Longest dry spell (CDD) at Portsmouth by year
Year	Longest dry spell (CDD)
1900	23 days
1901	24 days
1902	22 days
1903	17 days
1904	18 days
1938	10 days
1939	21 days
1940	18 days
1941	16 days
1942	15 days
1943	19 days
1944	23 days
1945	12 days
1946	15 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.

Download the Data

Data for Portsmouth standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Portsmouth 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 2026-10-16 (16 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).