Altoona Horseshoe Curv Weather Records (USC00360134)

Record envelope, standing records and threshold days for Altoona Horseshoe Curv (USC00360134), Pennsylvania, United States, with 75 years of record.

Key Facts for Altoona Horseshoe Curv

Altoona Horseshoe Curv (USC00360134) is a weather station in Pennsylvania, United States at 40.50 latitude and -78.48 longitude, 458 m (1,503 ft) above sea level.
The station reports from 1893 to 1967, 75 years of record.
1,464 records set at Altoona Horseshoe Curv still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Altoona Horseshoe Curv set a monthly record daily precipitation of 89.9 mm (3.5 in) on 29 September 1967.

About the Station

Location: Pennsylvania, United States, 40.50 latitude, -78.48 longitude.
Elevation: 458 m (1,503 ft).
Period of record: 1893 to 1967, 75 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 Altoona Horseshoe Curv. 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 Altoona Horseshoe Curv, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	25.6 C (78.1 F)	-27.8 C (-18.0 F)	n/a	n/a
Feb	23.9 C (75.0 F)	-28.9 C (-20.0 F)	n/a	n/a
Mar	28.3 C (82.9 F)	-22.2 C (-8.0 F)	n/a	n/a
Apr	32.8 C (91.0 F)	-15.6 C (3.9 F)	n/a	n/a
May	35.0 C (95.0 F)	-3.9 C (25.0 F)	n/a	n/a
Jun	37.2 C (99.0 F)	0.0 C (32.0 F)	n/a	n/a
Jul	37.8 C (100.0 F)	3.3 C (37.9 F)	n/a	n/a
Aug	38.9 C (102.0 F)	-6.7 C (19.9 F)	n/a	n/a
Sep	35.6 C (96.1 F)	-3.9 C (25.0 F)	n/a	n/a
Oct	32.2 C (90.0 F)	-9.4 C (15.1 F)	n/a	n/a
Nov	27.8 C (82.0 F)	-17.8 C (0.0 F)	n/a	n/a
Dec	20.6 C (69.1 F)	-25.0 C (-13.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Altoona Horseshoe Curv still stand. 1894 holds the most, with 47.

Standing records at Altoona Horseshoe Curv by the year they were set
Year set	Standing records
1893	34
1894	47
1895	42
1896	45
1897	17
1898	26
1899	23
1900	19
1901	11
1902	14
1903	16
1904	24
1905	10
1906	15
1907	26
1908	12
1909	16
1910	15
1911	28
1912	12
1913	20
1914	32
1915	19
1916	19
1917	26
1918	23
1919	13
1920	17
1921	7
1922	19
1923	24
1924	14
1925	23
1926	25
1927	28
1928	14
1929	34
1930	38
1931	15
1932	35
1933	23
1934	20
1935	10
1936	16
1937	15
1938	16
1939	13
1940	25
1941	20
1942	23
1943	20
1944	8
1945	20
1946	15
1947	17
1948	16
1949	13
1950	27
1951	23
1952	15
1953	10
1954	11
1955	12
1956	13
1957	11
1958	14
1959	11
1960	22
1961	19
1962	19
1963	18
1964	14
1965	14
1966	12
1967	12

All-Time Record Progression

5 new records

5 all-time records were set at Altoona Horseshoe Curv between 22 October 1929 and 8 May 1960. Each dot is a new record.

When Altoona Horseshoe Curv set new all-time records
Date	Kind	Detail
1929-10-22	Record daily precipitation	Record daily precipitation 96.3 mm (3.8 in)
1930-08-04	Record high maximum temperature	Record high maximum temperature 38.9 C (102.0 F)
1933-07-24	Record daily precipitation	Record daily precipitation 104.6 mm (4.1 in)
1949-07-12	Record daily precipitation	Record daily precipitation 105.9 mm (4.2 in)
1960-05-08	Record daily precipitation	Record daily precipitation 108.0 mm (4.3 in)

Wettest Day of Each Month

May: 108.0 mm (4.3 in)

The wettest day on record for each calendar month at Altoona Horseshoe Curv. The most was 108.0 mm (4.3 in) on 8 May 1960.

Record daily precipitation for each month at Altoona Horseshoe Curv
Month	Record daily precipitation (mm)	Date
Jan	39.9 mm (1.6 in)	14 January 1940
Feb	52.6 mm (2.1 in)	13 February 1966
Mar	104.1 mm (4.1 in)	17 March 1936
Apr	92.5 mm (3.6 in)	11 April 1902
May	108.0 mm (4.3 in)	8 May 1960
Jun	79.0 mm (3.1 in)	19 June 1948
Jul	105.9 mm (4.2 in)	12 July 1949
Aug	81.3 mm (3.2 in)	24 August 1945
Sep	89.9 mm (3.5 in)	29 September 1967
Oct	96.3 mm (3.8 in)	22 October 1929
Nov	99.1 mm (3.9 in)	25 November 1950
Dec	68.8 mm (2.7 in)	25 December 1941

Period of Record Coverage

1893 to 1967

75 years of record at Altoona Horseshoe Curv, 1893 to 1967. 7 years have data for under 90 percent of days and are left out of rankings: 1893, 1907, 1908, 1910, 1911, 1912, 1967.

Days with data per year at Altoona Horseshoe Curv
Year	Days with data	Share of year	Complete
1893	303	83%	No
1894	349	96%	Yes
1895	348	95%	Yes
1896	352	96%	Yes
1897	360	99%	Yes
1898	365	100%	Yes
1899	363	99%	Yes
1900	352	96%	Yes
1901	338	93%	Yes
1902	349	96%	Yes
1903	363	99%	Yes
1904	352	96%	Yes
1905	346	95%	Yes
1906	355	97%	Yes
1907	319	87%	No
1908	299	82%	No
1909	339	93%	Yes
1910	325	89%	No
1911	318	87%	No
1912	274	75%	No
1913	333	91%	Yes
1914	361	99%	Yes
1915	331	91%	Yes
1916	363	99%	Yes
1917	335	92%	Yes
1918	332	91%	Yes
1919	365	100%	Yes
1920	335	92%	Yes
1921	334	92%	Yes
1922	364	100%	Yes
1923	364	100%	Yes
1924	366	100%	Yes
1925	365	100%	Yes
1926	365	100%	Yes
1927	354	97%	Yes
1928	366	100%	Yes
1929	364	100%	Yes
1930	365	100%	Yes
1931	363	99%	Yes
1932	364	99%	Yes
1933	364	100%	Yes
1934	333	91%	Yes
1935	348	95%	Yes
1936	365	100%	Yes
1937	364	100%	Yes
1938	362	99%	Yes
1939	337	92%	Yes
1940	355	97%	Yes
1941	354	97%	Yes
1942	365	100%	Yes
1943	365	100%	Yes
1944	353	96%	Yes
1945	364	100%	Yes
1946	364	100%	Yes
1947	363	99%	Yes
1948	365	100%	Yes
1949	351	96%	Yes
1950	365	100%	Yes
1951	364	100%	Yes
1952	366	100%	Yes
1953	364	100%	Yes
1954	353	97%	Yes
1955	365	100%	Yes
1956	365	100%	Yes
1957	364	100%	Yes
1958	365	100%	Yes
1959	364	100%	Yes
1960	365	100%	Yes
1961	364	100%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	242	66%	No

Latest Records

Latest records at Altoona Horseshoe Curv
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
29 September 1967	Altoona Horseshoe Curv, US	monthly rain	89.9 mm (3.5 in)	4.0 mm (0.16 in)	70 years	41 of 100 (Notable)
12 September 1967	Altoona Horseshoe Curv, US	daily low min (Tie)	1.1 C (34.0 F)	tie	24 years	3 of 100 (Routine)
3 September 1967	Altoona Horseshoe Curv, US	daily low min (Tie)	4.4 C (39.9 F)	tie	50 years	5 of 100 (Routine)
1 September 1967	Altoona Horseshoe Curv, US	daily low max	17.2 C (63.0 F)	1.1 C (2.0 F)	57 years	26 of 100 (Routine)
1 September 1967	Altoona Horseshoe Curv, US	daily low min	2.8 C (37.0 F)	1.6 C (2.9 F)	18 years	15 of 100 (Routine)
4 August 1967	Altoona Horseshoe Curv, US	daily rain	36.8 mm (1.4 in)	9.4 mm (0.37 in)	68 years	35 of 100 (Notable)
17 July 1967	Altoona Horseshoe Curv, US	daily low max (Tie)	21.1 C (70.0 F)	tie	53 years	5 of 100 (Routine)
16 July 1967	Altoona Horseshoe Curv, US	daily low max	20.6 C (69.1 F)	0.5 C (0.9 F)	21 years	14 of 100 (Routine)
6 July 1967	Altoona Horseshoe Curv, US	daily low max (Tie)	22.2 C (72.0 F)	tie	40 years	4 of 100 (Routine)
18 June 1967	Altoona Horseshoe Curv, US	daily high max (Tie)	32.8 C (91.0 F)	tie	22 years	3 of 100 (Routine)
17 June 1967	Altoona Horseshoe Curv, US	daily high max	34.4 C (93.9 F)	0.5 C (0.9 F)	14 years	12 of 100 (Routine)
16 June 1967	Altoona Horseshoe Curv, US	daily high max	33.3 C (91.9 F)	0.5 C (0.9 F)	53 years	24 of 100 (Routine)
14 June 1967	Altoona Horseshoe Curv, US	daily high max	33.3 C (91.9 F)	1.1 C (2.0 F)	64 years	28 of 100 (Routine)
2 April 1967	Altoona Horseshoe Curv, US	daily high min	11.1 C (52.0 F)	1.1 C (2.0 F)	46 years	23 of 100 (Routine)
1 April 1967	Altoona Horseshoe Curv, US	daily high max	25.0 C (77.0 F)	1.1 C (2.0 F)	49 years	22 of 100 (Routine)
21 March 1967	Altoona Horseshoe Curv, US	daily rain	32.5 mm (1.3 in)	0.7 mm (0.03 in)	54 years	23 of 100 (Routine)
19 March 1967	Altoona Horseshoe Curv, US	daily low min	-19.4 C (-2.9 F)	2.7 C (4.9 F)	28 years	19 of 100 (Routine)
15 March 1967	Altoona Horseshoe Curv, US	daily rain	31.5 mm (1.2 in)	5.6 mm (0.22 in)	54 years	29 of 100 (Routine)
7 March 1967	Altoona Horseshoe Curv, US	daily rain	38.1 mm (1.5 in)	14.0 mm (0.6 in)	62 years	40 of 100 (Notable)
7 March 1967	Altoona Horseshoe Curv, US	daily snowfall	33.0 cm (13.0 in)	15.2 cm (6.0 in)	4 years	30 of 100 (Routine)

Climate Trend

56 complete years, 1894 to 1966

One stripe for each of 56 complete years at Altoona Horseshoe Curv, 1894 to 1966. Blue stripes are years cooler than the station's own mean of 9.9 C (49.7 F); red stripes are warmer. The coolest year was 1904, at 8.1 C (46.6 F), and the warmest was 1894, at 13.7 C (56.6 F). The strongest colour marks a difference of 3.9 C (7.0 F).

Annual mean temperature at Altoona Horseshoe Curv as warming stripes, 1894 to 1966
Year	Annual mean temperature	Difference from the station mean
1894	13.7 C	+3.81 C
1895	12.2 C	+2.31 C
1896	12.1 C	+2.23 C
1897	11.8 C	+1.94 C
1898	11.6 C	+1.74 C
1899	9.9 C	-0.01 C
1900	10.4 C	+0.49 C
1902	9.7 C	-0.12 C
1903	9.6 C	-0.25 C
1904	8.1 C	-1.74 C
1906	9.4 C	-0.42 C
1910	9.3 C	-0.55 C
1914	9.0 C	-0.90 C
1916	9.4 C	-0.51 C
1919	10.1 C	+0.19 C
1922	10.4 C	+0.51 C
1923	9.6 C	-0.29 C
1924	8.3 C	-1.52 C
1925	9.5 C	-0.35 C
1926	8.6 C	-1.30 C
1927	9.6 C	-0.22 C
1928	9.5 C	-0.38 C
1929	9.7 C	-0.18 C
1930	10.1 C	+0.27 C
1931	11.1 C	+1.22 C
1932	10.2 C	+0.36 C
1933	10.2 C	+0.32 C
1936	9.2 C	-0.64 C
1937	9.3 C	-0.59 C
1938	10.2 C	+0.29 C
1940	8.4 C	-1.49 C
1941	10.0 C	+0.11 C
1942	9.7 C	-0.12 C
1943	9.4 C	-0.47 C
1944	9.6 C	-0.24 C
1945	9.6 C	-0.25 C
1946	10.3 C	+0.41 C
1947	9.5 C	-0.34 C
1948	9.8 C	-0.09 C
1949	10.8 C	+0.98 C
1950	9.3 C	-0.59 C
1951	9.7 C	-0.21 C
1952	10.2 C	+0.37 C
1953	10.8 C	+0.93 C
1955	9.9 C	+0.00 C
1956	9.5 C	-0.41 C
1957	10.0 C	+0.10 C
1958	8.5 C	-1.36 C
1959	10.4 C	+0.49 C
1960	9.1 C	-0.74 C
1961	9.5 C	-0.32 C
1962	9.0 C	-0.85 C
1963	9.2 C	-0.69 C
1964	9.8 C	-0.09 C
1965	9.6 C	-0.27 C
1966	9.1 C	-0.75 C

The annual mean temperature here has fallen by 0.2 C (0.1 to 0.3) per decade over 1894 to 1966. In Fahrenheit: 0.3 F (0.1 to 0.5) per decade. The slope is a straight line fitted to 56 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Altoona Horseshoe Curv
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	-0.2 C (-0.3 to -0.1) per decade	-0.3 F (-0.5 to -0.1) per decade	1894 to 1966	56	Fall
Mean daily maximum	-0.2 C (-0.3 to -0.1) per decade	-0.3 F (-0.5 to -0.1) per decade	1894 to 1966	56	Fall
Mean daily minimum	-0.2 C (-0.3 to -0.1) per decade	-0.4 F (-0.6 to -0.1) per decade	1894 to 1966	56	Fall

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

1893 to 1967

Yearly extremes at Altoona Horseshoe Curv: 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)	1930	34.4 C (93.9 F)	75
Coldest night (TNn)	-28.9 C (-20.0 F)	1899	-21.1 C (-6.0 F)	75
Wettest day (Rx1day)	108.0 mm (4.3 in)	1960	52.8 mm (2.1 in)	75
Wettest five days (Rx5day)	167.1 mm (6.6 in)	1936	86.1 mm (3.4 in)	75
Longest dry spell (CDD)	32 days	1908	17 days	75

Hottest day (TXx)

The hottest day of the year at Altoona Horseshoe Curv, 1893 to 1967. The record is 38.9 C (102.0 F) in 1930, marked on the chart; the median year is 34.4 C (93.9 F).

Hottest day (TXx) at Altoona Horseshoe Curv by year
Year	Hottest day (TXx)
1893	35.0 C (95.0 F)
1894	36.1 C (97.0 F)
1895	37.2 C (99.0 F)
1896	35.0 C (95.0 F)
1897	34.4 C (93.9 F)
1898	36.7 C (98.1 F)
1899	34.4 C (93.9 F)
1900	36.1 C (97.0 F)
1901	36.7 C (98.1 F)
1902	34.4 C (93.9 F)
1903	33.9 C (93.0 F)
1904	34.4 C (93.9 F)
1905	33.3 C (91.9 F)
1906	33.9 C (93.0 F)
1907	31.7 C (89.1 F)
1908	35.6 C (96.1 F)
1909	34.4 C (93.9 F)
1910	34.4 C (93.9 F)
1911	37.8 C (100.0 F)
1912	33.9 C (93.0 F)
1913	34.4 C (93.9 F)
1914	35.0 C (95.0 F)
1915	36.1 C (97.0 F)
1916	35.6 C (96.1 F)
1917	33.9 C (93.0 F)
1918	37.2 C (99.0 F)
1919	35.0 C (95.0 F)
1920	31.1 C (88.0 F)
1921	33.3 C (91.9 F)
1922	35.0 C (95.0 F)
1923	34.4 C (93.9 F)
1924	33.3 C (91.9 F)
1925	34.4 C (93.9 F)
1926	36.1 C (97.0 F)
1927	33.3 C (91.9 F)
1928	32.2 C (90.0 F)
1929	34.4 C (93.9 F)
1930	38.9 C (102.0 F)
1931	36.7 C (98.1 F)
1932	35.6 C (96.1 F)
1933	35.6 C (96.1 F)
1934	37.2 C (99.0 F)
1935	34.4 C (93.9 F)
1936	37.2 C (99.0 F)
1937	33.3 C (91.9 F)
1938	33.9 C (93.0 F)
1939	33.9 C (93.0 F)
1940	35.0 C (95.0 F)
1941	35.0 C (95.0 F)
1942	34.4 C (93.9 F)
1943	33.9 C (93.0 F)
1944	36.1 C (97.0 F)
1945	33.9 C (93.0 F)
1946	33.3 C (91.9 F)
1947	32.8 C (91.0 F)
1948	35.6 C (96.1 F)
1949	35.0 C (95.0 F)
1950	33.9 C (93.0 F)
1951	33.3 C (91.9 F)
1952	36.7 C (98.1 F)
1953	36.1 C (97.0 F)
1954	35.0 C (95.0 F)
1955	35.6 C (96.1 F)
1956	33.3 C (91.9 F)
1957	34.4 C (93.9 F)
1958	32.2 C (90.0 F)
1959	33.9 C (93.0 F)
1960	32.2 C (90.0 F)
1961	31.7 C (89.1 F)
1962	34.4 C (93.9 F)
1963	33.3 C (91.9 F)
1964	35.0 C (95.0 F)
1965	33.9 C (93.0 F)
1966	37.8 C (100.0 F)
1967	34.4 C (93.9 F)

Coldest night (TNn)

The coldest night of the year at Altoona Horseshoe Curv, 1893 to 1967. The record is -28.9 C (-20.0 F) in 1899, marked on the chart; the median year is -21.1 C (-6.0 F).

Coldest night (TNn) at Altoona Horseshoe Curv by year
Year	Coldest night (TNn)
1893	-16.7 C (1.9 F)
1894	-12.2 C (10.0 F)
1895	-19.4 C (-2.9 F)
1896	-18.3 C (-0.9 F)
1897	-17.2 C (1.0 F)
1898	-15.6 C (3.9 F)
1899	-28.9 C (-20.0 F)
1900	-22.2 C (-8.0 F)
1901	-20.0 C (-4.0 F)
1902	-18.9 C (-2.0 F)
1903	-21.7 C (-7.1 F)
1904	-27.8 C (-18.0 F)
1905	-23.3 C (-9.9 F)
1906	-22.8 C (-9.0 F)
1907	-25.0 C (-13.0 F)
1908	-22.8 C (-9.0 F)
1909	-20.6 C (-5.1 F)
1910	-21.1 C (-6.0 F)
1911	-17.2 C (1.0 F)
1912	-22.8 C (-9.0 F)
1913	-16.7 C (1.9 F)
1914	-25.6 C (-14.1 F)
1915	-21.1 C (-6.0 F)
1916	-21.7 C (-7.1 F)
1917	-25.0 C (-13.0 F)
1918	-25.0 C (-13.0 F)
1919	-21.1 C (-6.0 F)
1920	-19.4 C (-2.9 F)
1921	-17.8 C (0.0 F)
1922	-22.2 C (-8.0 F)
1923	-19.4 C (-2.9 F)
1924	-20.6 C (-5.1 F)
1925	-22.8 C (-9.0 F)
1926	-22.2 C (-8.0 F)
1927	-19.4 C (-2.9 F)
1928	-20.6 C (-5.1 F)
1929	-21.7 C (-7.1 F)
1930	-21.7 C (-7.1 F)
1931	-15.6 C (3.9 F)
1932	-18.3 C (-0.9 F)
1933	-21.1 C (-6.0 F)
1934	-28.9 C (-20.0 F)
1935	-20.6 C (-5.1 F)
1936	-26.1 C (-15.0 F)
1937	-17.2 C (1.0 F)
1938	-17.8 C (0.0 F)
1939	-18.3 C (-0.9 F)
1940	-22.8 C (-9.0 F)
1941	-20.0 C (-4.0 F)
1942	-25.0 C (-13.0 F)
1943	-23.3 C (-9.9 F)
1944	-21.7 C (-7.1 F)
1945	-20.6 C (-5.1 F)
1946	-19.4 C (-2.9 F)
1947	-20.0 C (-4.0 F)
1948	-22.2 C (-8.0 F)
1949	-16.1 C (3.0 F)
1950	-20.0 C (-4.0 F)
1951	-22.2 C (-8.0 F)
1952	-16.7 C (1.9 F)
1953	-13.9 C (7.0 F)
1954	-20.0 C (-4.0 F)
1955	-20.6 C (-5.1 F)
1956	-15.0 C (5.0 F)
1957	-21.7 C (-7.1 F)
1958	-21.7 C (-7.1 F)
1959	-18.9 C (-2.0 F)
1960	-23.9 C (-11.0 F)
1961	-27.2 C (-17.0 F)
1962	-21.1 C (-6.0 F)
1963	-26.7 C (-16.1 F)
1964	-16.7 C (1.9 F)
1965	-23.9 C (-11.0 F)
1966	-22.2 C (-8.0 F)
1967	-19.4 C (-2.9 F)

Wettest day (Rx1day)

The wettest day of the year at Altoona Horseshoe Curv, 1893 to 1967. The record is 108.0 mm (4.3 in) in 1960, marked on the chart; the median year is 52.8 mm (2.1 in).

Wettest day (Rx1day) at Altoona Horseshoe Curv by year
Year	Wettest day (Rx1day)
1893	61.0 mm (2.4 in)
1894	92.5 mm (3.6 in)
1895	38.9 mm (1.5 in)
1896	85.9 mm (3.4 in)
1897	52.8 mm (2.1 in)
1898	58.2 mm (2.3 in)
1899	57.7 mm (2.3 in)
1900	42.7 mm (1.7 in)
1901	53.8 mm (2.1 in)
1902	92.5 mm (3.6 in)
1903	62.5 mm (2.5 in)
1904	45.7 mm (1.8 in)
1905	52.1 mm (2.1 in)
1906	44.2 mm (1.7 in)
1907	41.9 mm (1.6 in)
1908	50.8 mm (2.0 in)
1909	45.2 mm (1.8 in)
1910	47.5 mm (1.9 in)
1911	67.3 mm (2.6 in)
1912	68.6 mm (2.7 in)
1913	73.9 mm (2.9 in)
1914	40.1 mm (1.6 in)
1915	42.7 mm (1.7 in)
1916	45.0 mm (1.8 in)
1917	43.9 mm (1.7 in)
1918	60.5 mm (2.4 in)
1919	50.8 mm (2.0 in)
1920	36.1 mm (1.4 in)
1921	77.0 mm (3.0 in)
1922	33.5 mm (1.3 in)
1923	35.1 mm (1.4 in)
1924	61.0 mm (2.4 in)
1925	41.9 mm (1.6 in)
1926	48.0 mm (1.9 in)
1927	50.8 mm (2.0 in)
1928	38.4 mm (1.5 in)
1929	96.3 mm (3.8 in)
1930	34.3 mm (1.4 in)
1931	40.9 mm (1.6 in)
1932	42.4 mm (1.7 in)
1933	104.6 mm (4.1 in)
1934	56.9 mm (2.2 in)
1935	37.8 mm (1.5 in)
1936	104.1 mm (4.1 in)
1937	53.3 mm (2.1 in)
1938	24.1 mm (0.9 in)
1939	63.5 mm (2.5 in)
1940	58.2 mm (2.3 in)
1941	68.8 mm (2.7 in)
1942	49.3 mm (1.9 in)
1943	46.7 mm (1.8 in)
1944	52.1 mm (2.1 in)
1945	81.3 mm (3.2 in)
1946	60.7 mm (2.4 in)
1947	37.3 mm (1.5 in)
1948	79.0 mm (3.1 in)
1949	105.9 mm (4.2 in)
1950	99.1 mm (3.9 in)
1951	67.3 mm (2.6 in)
1952	59.4 mm (2.3 in)
1953	44.2 mm (1.7 in)
1954	72.4 mm (2.9 in)
1955	75.4 mm (3.0 in)
1956	82.8 mm (3.3 in)
1957	49.0 mm (1.9 in)
1958	34.5 mm (1.4 in)
1959	65.0 mm (2.6 in)
1960	108.0 mm (4.3 in)
1961	39.9 mm (1.6 in)
1962	44.5 mm (1.8 in)
1963	57.9 mm (2.3 in)
1964	52.1 mm (2.1 in)
1965	60.2 mm (2.4 in)
1966	52.6 mm (2.1 in)
1967	89.9 mm (3.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Altoona Horseshoe Curv, 1893 to 1967. The record is 167.1 mm (6.6 in) in 1936, marked on the chart; the median year is 86.1 mm (3.4 in).

Wettest five days (Rx5day) at Altoona Horseshoe Curv by year
Year	Wettest five days (Rx5day)
1893	67.9 mm (2.7 in)
1894	161.6 mm (6.4 in)
1895	48.5 mm (1.9 in)
1896	89.0 mm (3.5 in)
1897	59.7 mm (2.4 in)
1898	112.9 mm (4.4 in)
1899	83.0 mm (3.3 in)
1900	79.8 mm (3.1 in)
1901	75.4 mm (3.0 in)
1902	116.4 mm (4.6 in)
1903	104.7 mm (4.1 in)
1904	90.8 mm (3.6 in)
1905	64.2 mm (2.5 in)
1906	96.2 mm (3.8 in)
1907	82.3 mm (3.2 in)
1908	59.2 mm (2.3 in)
1909	53.0 mm (2.1 in)
1910	67.3 mm (2.6 in)
1911	79.9 mm (3.1 in)
1912	151.1 mm (5.9 in)
1913	94.5 mm (3.7 in)
1914	65.1 mm (2.6 in)
1915	77.1 mm (3.0 in)
1916	128.1 mm (5.0 in)
1917	64.6 mm (2.5 in)
1918	97.3 mm (3.8 in)
1919	96.7 mm (3.8 in)
1920	83.1 mm (3.3 in)
1921	102.4 mm (4.0 in)
1922	53.3 mm (2.1 in)
1923	73.4 mm (2.9 in)
1924	98.6 mm (3.9 in)
1925	75.4 mm (3.0 in)
1926	94.0 mm (3.7 in)
1927	112.8 mm (4.4 in)
1928	98.2 mm (3.9 in)
1929	120.6 mm (4.7 in)
1930	41.6 mm (1.6 in)
1931	76.9 mm (3.0 in)
1932	63.2 mm (2.5 in)
1933	119.3 mm (4.7 in)
1934	81.3 mm (3.2 in)
1935	64.8 mm (2.6 in)
1936	167.1 mm (6.6 in)
1937	114.8 mm (4.5 in)
1938	47.6 mm (1.9 in)
1939	120.1 mm (4.7 in)
1940	75.9 mm (3.0 in)
1941	113.7 mm (4.5 in)
1942	91.6 mm (3.6 in)
1943	90.1 mm (3.5 in)
1944	80.7 mm (3.2 in)
1945	93.2 mm (3.7 in)
1946	86.1 mm (3.4 in)
1947	54.6 mm (2.1 in)
1948	110.5 mm (4.4 in)
1949	119.6 mm (4.7 in)
1950	109.5 mm (4.3 in)
1951	160.8 mm (6.3 in)
1952	111.6 mm (4.4 in)
1953	75.2 mm (3.0 in)
1954	92.9 mm (3.7 in)
1955	87.1 mm (3.4 in)
1956	157.2 mm (6.2 in)
1957	61.8 mm (2.4 in)
1958	70.8 mm (2.8 in)
1959	76.4 mm (3.0 in)
1960	146.5 mm (5.8 in)
1961	74.4 mm (2.9 in)
1962	76.8 mm (3.0 in)
1963	68.6 mm (2.7 in)
1964	94.8 mm (3.7 in)
1965	64.8 mm (2.6 in)
1966	70.9 mm (2.8 in)
1967	116.3 mm (4.6 in)

Longest dry spell (CDD)

The longest dry spell of the year at Altoona Horseshoe Curv, 1893 to 1967. The record is 32 days in 1908, marked on the chart; the median year is 17 days.

Longest dry spell (CDD) at Altoona Horseshoe Curv by year
Year	Longest dry spell (CDD)
1893	18 days
1894	18 days
1895	19 days
1896	14 days
1897	19 days
1898	14 days
1899	20 days
1900	16 days
1901	21 days
1902	13 days
1903	18 days
1904	14 days
1905	14 days
1906	15 days
1907	13 days
1908	32 days
1909	20 days
1910	23 days
1911	21 days
1912	11 days
1913	15 days
1914	25 days
1915	11 days
1916	12 days
1917	19 days
1918	19 days
1919	11 days
1920	22 days
1921	14 days
1922	24 days
1923	20 days
1924	18 days
1925	22 days
1926	18 days
1927	14 days
1928	18 days
1929	14 days
1930	22 days
1931	16 days
1932	22 days
1933	14 days
1934	19 days
1935	14 days
1936	17 days
1937	9 days
1938	19 days
1939	19 days
1940	11 days
1941	18 days
1942	20 days
1943	18 days
1944	18 days
1945	8 days
1946	12 days
1947	17 days
1948	16 days
1949	13 days
1950	15 days
1951	19 days
1952	16 days
1953	25 days
1954	13 days
1955	19 days
1956	14 days
1957	14 days
1958	11 days
1959	24 days
1960	15 days
1961	13 days
1962	13 days
1963	27 days
1964	26 days
1965	10 days
1966	15 days
1967	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

56 years with a frost

Across 56 years with a frost, the median last spring frost at Altoona Horseshoe Curv falls on 4 May and the median first autumn frost on 7 October, which leaves a median of 157 days between them.

Fitted over all years, the growing season changes by -2.6 days per decade at this station.

Frost dates and growing season at Altoona Horseshoe Curv
Measure	Median, all years	Earliest period	Recent period (1933 to 1966)	Recent against earliest	Fitted trend
Last spring frost	4 May	n/a	7 May	n/a	+1.7 days per decade
First autumn frost	7 October	n/a	4 October	n/a	-0.8 days per decade
Growing days	157 days	n/a	152 days	n/a	-2.6 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

71 years, 1893 to 1966

A day with at least 53.4 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 131.4 mm (5.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Altoona Horseshoe Curv: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	53.4 mm (2.1 in)
5 years	71.1 mm (2.8 in)
10 years	84.0 mm (3.3 in)
25 years	101.8 mm (4.0 in)
50 years	116.1 mm (4.6 in)
100 years	131.4 mm (5.2 in)	Longer than the 71 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, 71 years of values from 1893 to 1966.

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: 108.0 mm (4.3 in) in 1960; 105.9 mm (4.2 in) in 1949; 104.6 mm (4.1 in) in 1933.

Station Changes

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

Download the Data

Data for Altoona Horseshoe Curv standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Altoona Horseshoe Curv 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).