Confluence 1 NW Weather Records (USC00361710)

Record envelope, standing records and threshold days for Confluence 1 NW (USC00361710), Pennsylvania, United States, with 90 years of record.

Key Facts for Confluence 1 NW

Confluence 1 NW (USC00361710) is a weather station in Pennsylvania, United States at 39.83 latitude and -79.37 longitude, 406 m (1,331 ft) above sea level.
The station reports from 1892 to 1981, 90 years of record.
1,460 records set at Confluence 1 NW still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Confluence 1 NW tied a daily record snowfall of 10.2 cm (4.0 in) on 2 January 1981.

About the Station

Location: Pennsylvania, United States, 39.83 latitude, -79.37 longitude.
Elevation: 406 m (1,331 ft).
Period of record: 1892 to 1981, 90 years.
Eligible elements: 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 Confluence 1 NW. 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 Confluence 1 NW, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	17.2 C (63.0 F)	-23.3 C (-9.9 F)	n/a	n/a
Feb	27.2 C (81.0 F)	-30.6 C (-23.1 F)	n/a	n/a
Mar	27.2 C (81.0 F)	-18.9 C (-2.0 F)	n/a	n/a
Apr	30.6 C (87.1 F)	-13.3 C (8.1 F)	n/a	n/a
May	32.8 C (91.0 F)	-5.0 C (23.0 F)	n/a	n/a
Jun	33.9 C (93.0 F)	1.7 C (35.1 F)	n/a	n/a
Jul	37.2 C (99.0 F)	5.0 C (41.0 F)	n/a	n/a
Aug	34.4 C (93.9 F)	6.7 C (44.1 F)	n/a	n/a
Sep	36.1 C (97.0 F)	-5.6 C (21.9 F)	n/a	n/a
Oct	32.2 C (90.0 F)	-6.1 C (21.0 F)	n/a	n/a
Nov	28.3 C (82.9 F)	-16.7 C (1.9 F)	n/a	n/a
Dec	17.2 C (63.0 F)	-23.9 C (-11.0 F)	n/a	n/a

Which Years Hold Standing Records

1,460 standing records

1,460 records at Confluence 1 NW still stand. 1898 holds the most, with 308.

All-Time Record Progression

2 new records

2 all-time records were set at Confluence 1 NW between 8 September 1929 and 16 October 1954. Each dot is a new record.

When Confluence 1 NW set new all-time records
Date	Kind	Detail
1929-09-08	Record daily precipitation	Record daily precipitation 99.1 mm (3.9 in)
1954-10-16	Record daily precipitation	Record daily precipitation 122.9 mm (4.8 in)

Wettest Day of Each Month

Oct: 122.9 mm (4.8 in)

The wettest day on record for each calendar month at Confluence 1 NW. The most was 122.9 mm (4.8 in) on 16 October 1954.

Record daily precipitation for each month at Confluence 1 NW
Month	Record daily precipitation (mm)	Date
Jan	59.7 mm (2.4 in)	22 January 1917
Feb	49.0 mm (1.9 in)	27 February 1945
Mar	61.5 mm (2.4 in)	14 March 1933
Apr	56.1 mm (2.2 in)	21 April 1893
May	96.5 mm (3.8 in)	31 May 1905
Jun	79.5 mm (3.1 in)	19 June 1964
Jul	86.4 mm (3.4 in)	25 July 1908
Aug	93.0 mm (3.7 in)	6 August 1956
Sep	104.1 mm (4.1 in)	14 September 1971
Oct	122.9 mm (4.8 in)	16 October 1954
Nov	49.0 mm (1.9 in)	26 November 1900
Dec	76.2 mm (3.0 in)	2 December 1974

Period of Record Coverage

1896 to 1901

6 years of record at Confluence 1 NW, 1896 to 1901. 3 years have data for under 90 percent of days and are left out of rankings: 1896, 1899, 1901.

Latest Records

Latest records at Confluence 1 NW
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
2 January 1981	Confluence 1 NW, US	daily snowfall (Tie)	10.2 cm (4.0 in)	tie	56 years	6 of 100 (Routine)
3 June 1980	Confluence 1 NW, US	daily rain	23.9 mm (0.9 in)	3.1 mm (0.12 in)	65 years	20 of 100 (Routine)
16 April 1980	Confluence 1 NW, US	daily snowfall (Tie)	2.5 cm (1.0 in)	tie	18 years	3 of 100 (Routine)
16 April 1980	Confluence 1 NW, US	daily snow depth (Tie)	2.5 cm (1.0 in)	tie	18 years	3 of 100 (Routine)
14 March 1980	Confluence 1 NW, US	daily snow depth	17.8 cm (7.0 in)	5.1 cm (2.0 in)	22 years	20 of 100 (Routine)
5 January 1980	Confluence 1 NW, US	daily snowfall (Tie)	3.8 cm (1.5 in)	tie	86 years	8 of 100 (Routine)
27 August 1979	Confluence 1 NW, US	daily rain	76.2 mm (3.0 in)	27.9 mm (1.1 in)	38 years	43 of 100 (Notable)
27 May 1979	Confluence 1 NW, US	daily rain	32.3 mm (1.3 in)	1.8 mm (0.07 in)	38 years	20 of 100 (Routine)
27 April 1979	Confluence 1 NW, US	daily rain	19.6 mm (0.8 in)	0.5 mm (0.02 in)	20 years	14 of 100 (Routine)
27 February 1979	Confluence 1 NW, US	daily snowfall	10.2 cm (4.0 in)	4.4 cm (1.7 in)	33 years	27 of 100 (Routine)
21 February 1979	Confluence 1 NW, US	daily snow depth	45.7 cm (18.0 in)	5.1 cm (2.0 in)	7 years	15 of 100 (Routine)
20 February 1979	Confluence 1 NW, US	daily snow depth	55.9 cm (22.0 in)	15.3 cm (6.0 in)	57 years	41 of 100 (Notable)
19 February 1979	Confluence 1 NW, US	daily snow depth	55.9 cm (22.0 in)	17.8 cm (7.0 in)	0 years	27 of 100 (Routine)
18 February 1979	Confluence 1 NW, US	daily snow depth (Tie)	33.0 cm (13.0 in)	tie	0 years	2 of 100 (Routine)
17 February 1979	Confluence 1 NW, US	daily snow depth (Tie)	33.0 cm (13.0 in)	tie	0 years	2 of 100 (Routine)
15 February 1979	Confluence 1 NW, US	daily snow depth (Tie)	35.6 cm (14.0 in)	tie	0 years	2 of 100 (Routine)
14 February 1979	Confluence 1 NW, US	daily snow depth	40.6 cm (16.0 in)	2.5 cm (1.0 in)	17 years	15 of 100 (Routine)
13 February 1979	Confluence 1 NW, US	daily snowfall (Tie)	17.8 cm (7.0 in)	tie	44 years	5 of 100 (Routine)
21 January 1979	Confluence 1 NW, US	daily rain	27.9 mm (1.1 in)	1.2 mm (0.05 in)	41 years	21 of 100 (Routine)
25 December 1978	Confluence 1 NW, US	daily rain	26.4 mm (1.0 in)	1.5 mm (0.06 in)	73 years	31 of 100 (Routine)

Extremes by Year

1892 to 1981

Yearly extremes at Confluence 1 NW: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	37.2 C (99.0 F)	1897	36.2 C (97.1 F)	6
Coldest night (TNn)	-30.6 C (-23.1 F)	1899	-23.3 C (-9.9 F)	7
Wettest day (Rx1day)	122.9 mm (4.8 in)	1954	51.6 mm (2.0 in)	90
Wettest five days (Rx5day)	165.4 mm (6.5 in)	1971	83.7 mm (3.3 in)	90
Longest dry spell (CDD)	29 days	1908	14 days	90

Hottest day (TXx)

The hottest day of the year at Confluence 1 NW, 1892 to 1981. The record is 37.2 C (99.0 F) in 1897, marked on the chart; the median year is 36.2 C (97.1 F).

Hottest day (TXx) at Confluence 1 NW by year
Year	Hottest day (TXx)
1892	n/a
1893	n/a
1894	n/a
1895	n/a
1896	34.4 C (93.9 F)
1897	37.2 C (99.0 F)
1898	36.7 C (98.1 F)
1899	32.8 C (91.0 F)
1900	35.6 C (96.1 F)
1901	37.2 C (99.0 F)
1902	n/a
1903	n/a
1904	n/a
1905	n/a
1906	n/a
1907	n/a
1908	n/a
1909	n/a
1910	n/a
1911	n/a
1912	n/a
1913	n/a
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
1957	n/a
1958	n/a
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
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a

Coldest night (TNn)

The coldest night of the year at Confluence 1 NW, 1892 to 1981. The record is -30.6 C (-23.1 F) in 1899, marked on the chart; the median year is -23.3 C (-9.9 F).

Coldest night (TNn) at Confluence 1 NW by year
Year	Coldest night (TNn)
1892	n/a
1893	n/a
1894	n/a
1895	n/a
1896	-16.1 C (3.0 F)
1897	-23.3 C (-9.9 F)
1898	-23.9 C (-11.0 F)
1899	-30.6 C (-23.1 F)
1900	-22.8 C (-9.0 F)
1901	-23.9 C (-11.0 F)
1902	n/a
1903	n/a
1904	n/a
1905	n/a
1906	n/a
1907	n/a
1908	n/a
1909	n/a
1910	n/a
1911	n/a
1912	n/a
1913	n/a
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	-5.6 C (21.9 F)
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
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
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a

Wettest day (Rx1day)

The wettest day of the year at Confluence 1 NW, 1892 to 1981. The record is 122.9 mm (4.8 in) in 1954, marked on the chart; the median year is 51.6 mm (2.0 in).

Wettest day (Rx1day) at Confluence 1 NW by year
Year	Wettest day (Rx1day)
1892	40.4 mm (1.6 in)
1893	57.2 mm (2.3 in)
1894	45.0 mm (1.8 in)
1895	49.0 mm (1.9 in)
1896	56.4 mm (2.2 in)
1897	43.7 mm (1.7 in)
1898	50.8 mm (2.0 in)
1899	63.5 mm (2.5 in)
1900	49.0 mm (1.9 in)
1901	44.7 mm (1.8 in)
1902	42.2 mm (1.7 in)
1903	38.1 mm (1.5 in)
1904	30.5 mm (1.2 in)
1905	96.5 mm (3.8 in)
1906	50.8 mm (2.0 in)
1907	45.7 mm (1.8 in)
1908	86.4 mm (3.4 in)
1909	48.3 mm (1.9 in)
1910	37.1 mm (1.5 in)
1911	78.7 mm (3.1 in)
1912	61.0 mm (2.4 in)
1913	32.8 mm (1.3 in)
1914	53.8 mm (2.1 in)
1915	33.0 mm (1.3 in)
1916	55.9 mm (2.2 in)
1917	59.7 mm (2.4 in)
1918	45.7 mm (1.8 in)
1919	62.2 mm (2.4 in)
1920	45.2 mm (1.8 in)
1921	62.7 mm (2.5 in)
1922	27.9 mm (1.1 in)
1923	55.9 mm (2.2 in)
1924	78.7 mm (3.1 in)
1925	74.7 mm (2.9 in)
1926	42.4 mm (1.7 in)
1927	58.4 mm (2.3 in)
1928	61.0 mm (2.4 in)
1929	99.1 mm (3.9 in)
1930	36.6 mm (1.4 in)
1931	48.3 mm (1.9 in)
1932	74.4 mm (2.9 in)
1933	61.7 mm (2.4 in)
1934	58.4 mm (2.3 in)
1935	74.9 mm (2.9 in)
1936	54.6 mm (2.1 in)
1937	48.3 mm (1.9 in)
1938	43.2 mm (1.7 in)
1939	47.0 mm (1.9 in)
1940	55.9 mm (2.2 in)
1941	52.3 mm (2.1 in)
1942	42.9 mm (1.7 in)
1943	39.4 mm (1.6 in)
1944	60.5 mm (2.4 in)
1945	49.0 mm (1.9 in)
1946	56.4 mm (2.2 in)
1947	45.2 mm (1.8 in)
1948	56.1 mm (2.2 in)
1949	47.5 mm (1.9 in)
1950	77.2 mm (3.0 in)
1951	41.9 mm (1.6 in)
1952	46.0 mm (1.8 in)
1953	48.0 mm (1.9 in)
1954	122.9 mm (4.8 in)
1955	61.0 mm (2.4 in)
1956	93.0 mm (3.7 in)
1957	50.5 mm (2.0 in)
1958	35.1 mm (1.4 in)
1959	48.8 mm (1.9 in)
1960	57.4 mm (2.3 in)
1961	40.9 mm (1.6 in)
1962	56.9 mm (2.2 in)
1963	56.9 mm (2.2 in)
1964	79.5 mm (3.1 in)
1965	33.5 mm (1.3 in)
1966	73.7 mm (2.9 in)
1967	44.7 mm (1.8 in)
1968	66.3 mm (2.6 in)
1969	63.0 mm (2.5 in)
1970	54.6 mm (2.1 in)
1971	104.1 mm (4.1 in)
1972	64.0 mm (2.5 in)
1973	44.5 mm (1.8 in)
1974	76.2 mm (3.0 in)
1975	64.3 mm (2.5 in)
1976	45.2 mm (1.8 in)
1977	38.6 mm (1.5 in)
1978	36.3 mm (1.4 in)
1979	76.2 mm (3.0 in)
1980	33.0 mm (1.3 in)
1981	7.4 mm (0.29 in)

Wettest five days (Rx5day)

The wettest five days of the year at Confluence 1 NW, 1892 to 1981. The record is 165.4 mm (6.5 in) in 1971, marked on the chart; the median year is 83.7 mm (3.3 in).

Wettest five days (Rx5day) at Confluence 1 NW by year
Year	Wettest five days (Rx5day)
1892	56.1 mm (2.2 in)
1893	88.2 mm (3.5 in)
1894	71.4 mm (2.8 in)
1895	95.7 mm (3.8 in)
1896	122.2 mm (4.8 in)
1897	79.0 mm (3.1 in)
1898	90.9 mm (3.6 in)
1899	93.7 mm (3.7 in)
1900	95.4 mm (3.8 in)
1901	67.3 mm (2.6 in)
1902	77.7 mm (3.1 in)
1903	66.0 mm (2.6 in)
1904	62.5 mm (2.5 in)
1905	118.3 mm (4.7 in)
1906	101.2 mm (4.0 in)
1907	110.0 mm (4.3 in)
1908	113.8 mm (4.5 in)
1909	66.5 mm (2.6 in)
1910	84.8 mm (3.3 in)
1911	109.9 mm (4.3 in)
1912	103.5 mm (4.1 in)
1913	56.4 mm (2.2 in)
1914	78.7 mm (3.1 in)
1915	70.1 mm (2.8 in)
1916	96.3 mm (3.8 in)
1917	63.8 mm (2.5 in)
1918	95.8 mm (3.8 in)
1919	73.5 mm (2.9 in)
1920	95.0 mm (3.7 in)
1921	116.3 mm (4.6 in)
1922	51.0 mm (2.0 in)
1923	104.1 mm (4.1 in)
1924	94.4 mm (3.7 in)
1925	80.8 mm (3.2 in)
1926	89.9 mm (3.5 in)
1927	85.3 mm (3.4 in)
1928	92.8 mm (3.7 in)
1929	125.2 mm (4.9 in)
1930	57.9 mm (2.3 in)
1931	59.9 mm (2.4 in)
1932	92.1 mm (3.6 in)
1933	94.5 mm (3.7 in)
1934	66.5 mm (2.6 in)
1935	135.8 mm (5.3 in)
1936	117.3 mm (4.6 in)
1937	82.6 mm (3.3 in)
1938	68.1 mm (2.7 in)
1939	74.1 mm (2.9 in)
1940	119.6 mm (4.7 in)
1941	136.0 mm (5.4 in)
1942	65.1 mm (2.6 in)
1943	59.9 mm (2.4 in)
1944	64.3 mm (2.5 in)
1945	72.1 mm (2.8 in)
1946	75.6 mm (3.0 in)
1947	53.3 mm (2.1 in)
1948	110.5 mm (4.4 in)
1949	75.8 mm (3.0 in)
1950	91.1 mm (3.6 in)
1951	131.1 mm (5.2 in)
1952	60.3 mm (2.4 in)
1953	59.7 mm (2.4 in)
1954	127.3 mm (5.0 in)
1955	108.2 mm (4.3 in)
1956	123.2 mm (4.9 in)
1957	60.6 mm (2.4 in)
1958	80.6 mm (3.2 in)
1959	66.0 mm (2.6 in)
1960	76.8 mm (3.0 in)
1961	75.2 mm (3.0 in)
1962	64.2 mm (2.5 in)
1963	81.3 mm (3.2 in)
1964	133.4 mm (5.3 in)
1965	50.3 mm (2.0 in)
1966	89.5 mm (3.5 in)
1967	96.1 mm (3.8 in)
1968	92.5 mm (3.6 in)
1969	103.6 mm (4.1 in)
1970	66.3 mm (2.6 in)
1971	165.4 mm (6.5 in)
1972	107.4 mm (4.2 in)
1973	82.5 mm (3.2 in)
1974	78.7 mm (3.1 in)
1975	89.1 mm (3.5 in)
1976	88.9 mm (3.5 in)
1977	67.1 mm (2.6 in)
1978	80.5 mm (3.2 in)
1979	102.5 mm (4.0 in)
1980	78.2 mm (3.1 in)
1981	15.7 mm (0.6 in)

Longest dry spell (CDD)

The longest dry spell of the year at Confluence 1 NW, 1892 to 1981. The record is 29 days in 1908, marked on the chart; the median year is 14 days.

Longest dry spell (CDD) at Confluence 1 NW by year
Year	Longest dry spell (CDD)
1892	12 days
1893	13 days
1894	10 days
1895	14 days
1896	10 days
1897	18 days
1898	14 days
1899	19 days
1900	18 days
1901	21 days
1902	19 days
1903	18 days
1904	13 days
1905	19 days
1906	13 days
1907	11 days
1908	29 days
1909	16 days
1910	13 days
1911	21 days
1912	19 days
1913	15 days
1914	14 days
1915	13 days
1916	9 days
1917	22 days
1918	18 days
1919	14 days
1920	20 days
1921	12 days
1922	25 days
1923	23 days
1924	26 days
1925	12 days
1926	9 days
1927	14 days
1928	11 days
1929	14 days
1930	14 days
1931	11 days
1932	27 days
1933	13 days
1934	19 days
1935	16 days
1936	12 days
1937	8 days
1938	13 days
1939	14 days
1940	11 days
1941	17 days
1942	16 days
1943	14 days
1944	13 days
1945	10 days
1946	8 days
1947	11 days
1948	11 days
1949	20 days
1950	10 days
1951	16 days
1952	17 days
1953	21 days
1954	12 days
1955	19 days
1956	14 days
1957	15 days
1958	12 days
1959	14 days
1960	17 days
1961	11 days
1962	14 days
1963	23 days
1964	18 days
1965	13 days
1966	14 days
1967	26 days
1968	13 days
1969	13 days
1970	10 days
1971	15 days
1972	16 days
1973	15 days
1974	16 days
1975	11 days
1976	16 days
1977	16 days
1978	11 days
1979	10 days
1980	14 days
1981	2 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

81 years, 1893 to 1980

A day with at least 52.7 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 117.6 mm (4.6 in) of rain is expected about once in 100 years.

Rainfall return levels at Confluence 1 NW: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	52.7 mm (2.1 in)
5 years	68.5 mm (2.7 in)
10 years	79.6 mm (3.1 in)
25 years	94.3 mm (3.7 in)
50 years	105.7 mm (4.2 in)
100 years	117.6 mm (4.6 in)	Longer than the 81 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, 81 years of values from 1893 to 1980.

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: 122.9 mm (4.8 in) in 1954; 104.1 mm (4.1 in) in 1971; 99.1 mm (3.9 in) in 1929.

Download the Data

Data for Confluence 1 NW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Confluence 1 NW 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).

Year	Days with data	Share of year	Complete
1896	184	50%	No
1897	364	100%	Yes
1898	361	99%	Yes
1899	255	70%	No
1900	332	91%	Yes
1901	259	71%	No