Roanoke Weather Records (USC00447275)

Record envelope, standing records and threshold days for Roanoke (USC00447275), Virginia, United States, with 65 years of record.

Key Facts for Roanoke

Roanoke (USC00447275) is a weather station in Virginia, United States at 37.27 latitude and -79.93 longitude, 278 m (912 ft) above sea level.
The station reports from 1901 to 1965, 65 years of record.
1,464 records set at Roanoke still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Roanoke set a daily record high maximum temperature of 20.6 C (69.1 F) on 31 December 1965.

About the Station

Location: Virginia, United States, 37.27 latitude, -79.93 longitude.
Elevation: 278 m (912 ft).
Period of record: 1901 to 1965, 65 years.
Eligible elements: tmax, tmin, prcp, snow.

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 Roanoke. 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 Roanoke, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	27.2 C (81.0 F)	-22.2 C (-8.0 F)	n/a	n/a
Feb	28.3 C (82.9 F)	-18.3 C (-0.9 F)	n/a	n/a
Mar	32.2 C (90.0 F)	-13.3 C (8.1 F)	n/a	n/a
Apr	37.2 C (99.0 F)	-9.4 C (15.1 F)	n/a	n/a
May	37.2 C (99.0 F)	-1.1 C (30.0 F)	n/a	n/a
Jun	40.0 C (104.0 F)	2.2 C (36.0 F)	n/a	n/a
Jul	41.1 C (106.0 F)	8.3 C (46.9 F)	n/a	n/a
Aug	40.6 C (105.1 F)	7.2 C (45.0 F)	n/a	n/a
Sep	39.4 C (102.9 F)	0.0 C (32.0 F)	n/a	n/a
Oct	37.2 C (99.0 F)	-5.6 C (21.9 F)	n/a	n/a
Nov	28.9 C (84.0 F)	-13.3 C (8.1 F)	n/a	n/a
Dec	26.1 C (79.0 F)	-24.4 C (-11.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Roanoke still stand. 1930 holds the most, with 56.

Standing records at Roanoke by the year they were set
Year set	Standing records
1901	19
1902	18
1903	47
1904	19
1905	40
1906	27
1907	20
1908	6
1912	32
1913	22
1914	46
1915	18
1916	14
1917	37
1918	43
1919	22
1920	24
1921	19
1922	10
1923	24
1924	22
1925	48
1926	23
1927	37
1928	12
1929	26
1930	56
1931	26
1932	27
1933	33
1934	29
1935	23
1936	34
1937	25
1938	15
1939	22
1940	35
1941	30
1942	30
1943	26
1944	20
1945	19
1946	21
1947	30
1948	5
1949	14
1950	20
1951	13
1952	17
1953	11
1954	28
1955	12
1956	25
1957	18
1958	14
1959	14
1960	20
1961	20
1962	19
1963	22
1965	16

All-Time Record Progression

4 new records

4 all-time records were set at Roanoke between 18 September 1944 and 17 February 1958. Each dot is a new record.

When Roanoke set new all-time records
Date	Kind	Detail
1944-09-18	Record daily precipitation	Record daily precipitation 155.7 mm (6.1 in)
1954-07-14	Record high maximum temperature	Record high maximum temperature 41.1 C (106.0 F)
1954-10-15	Record daily precipitation	Record daily precipitation 174.8 mm (6.9 in)
1958-02-17	Record low maximum temperature	Record low maximum temperature -11.7 C (10.9 F)

Wettest Day of Each Month

Oct: 174.8 mm (6.9 in)

The wettest day on record for each calendar month at Roanoke. The most was 174.8 mm (6.9 in) on 15 October 1954.

Record daily precipitation for each month at Roanoke
Month	Record daily precipitation (mm)	Date
Jan	56.1 mm (2.2 in)	16 January 1924
Feb	74.7 mm (2.9 in)	24 February 1902
Mar	82.6 mm (3.3 in)	17 March 1936
Apr	73.7 mm (2.9 in)	19 April 1943
May	112.8 mm (4.4 in)	24 May 1940
Jun	96.0 mm (3.8 in)	14 June 1947
Jul	85.9 mm (3.4 in)	29 July 1940
Aug	136.1 mm (5.4 in)	14 August 1940
Sep	155.7 mm (6.1 in)	18 September 1944
Oct	174.8 mm (6.9 in)	15 October 1954
Nov	78.5 mm (3.1 in)	30 November 1934
Dec	96.5 mm (3.8 in)	3 December 1948

Period of Record Coverage

1901 to 1965

62 years of record at Roanoke, 1901 to 1965. 11 years have data for under 90 percent of days and are left out of rankings: 1901, 1902, 1903, 1904, 1905, 1906, 1907, 1908 and others.

Days with data per year at Roanoke
Year	Days with data	Share of year	Complete
1901	82	22%	No
1902	287	79%	No
1903	300	82%	No
1904	256	70%	No
1905	309	85%	No
1906	237	65%	No
1907	305	84%	No
1908	114	31%	No
1912	355	97%	Yes
1913	362	99%	Yes
1914	361	99%	Yes
1915	365	100%	Yes
1916	287	78%	No
1917	363	99%	Yes
1918	361	99%	Yes
1919	360	99%	Yes
1920	333	91%	Yes
1921	364	100%	Yes
1922	365	100%	Yes
1923	362	99%	Yes
1924	360	98%	Yes
1925	363	99%	Yes
1926	363	99%	Yes
1927	364	100%	Yes
1928	363	99%	Yes
1929	362	99%	Yes
1930	355	97%	Yes
1931	359	98%	Yes
1932	366	100%	Yes
1933	365	100%	Yes
1934	363	99%	Yes
1935	365	100%	Yes
1936	366	100%	Yes
1937	365	100%	Yes
1938	365	100%	Yes
1939	365	100%	Yes
1940	365	100%	Yes
1941	363	99%	Yes
1942	365	100%	Yes
1943	365	100%	Yes
1944	366	100%	Yes
1945	364	100%	Yes
1946	365	100%	Yes
1947	365	100%	Yes
1948	153	42%	No
1949	365	100%	Yes
1950	365	100%	Yes
1951	365	100%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	365	100%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	347	95%	Yes
1961	361	99%	Yes
1962	363	99%	Yes
1963	365	100%	Yes
1964	31	8%	No
1965	331	91%	Yes

Latest Records

Latest records at Roanoke
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
31 December 1965	Roanoke, US	daily high max	20.6 C (69.1 F)	0.6 C (1.1 F)	36 years	16 of 100 (Routine)
30 December 1965	Roanoke, US	daily high max	19.4 C (66.9 F)	1.6 C (2.9 F)	58 years	25 of 100 (Routine)
11 December 1965	Roanoke, US	daily high max	20.0 C (68.0 F)	1.1 C (2.0 F)	36 years	17 of 100 (Routine)
30 October 1965	Roanoke, US	daily low min	-5.0 C (23.0 F)	1.1 C (2.0 F)	36 years	19 of 100 (Routine)
29 October 1965	Roanoke, US	daily low max (Tie)	10.0 C (50.0 F)	tie	64 years	6 of 100 (Routine)
7 October 1965	Roanoke, US	daily rain	71.1 mm (2.8 in)	30.2 mm (1.2 in)	43 years	32 of 100 (Routine)
30 August 1965	Roanoke, US	monthly low min (Tie)	7.2 C (45.0 F)	tie	35 years	6 of 100 (Routine)
29 August 1965	Roanoke, US	daily low min	8.3 C (46.9 F)	0.6 C (1.1 F)	60 years	25 of 100 (Routine)
14 August 1965	Roanoke, US	daily high min (Tie)	21.7 C (71.1 F)	tie	40 years	4 of 100 (Routine)
25 July 1965	Roanoke, US	daily high min	22.8 C (73.0 F)	0.6 C (1.1 F)	58 years	25 of 100 (Routine)
2 July 1965	Roanoke, US	daily low min	11.1 C (52.0 F)	1.1 C (2.0 F)	46 years	22 of 100 (Routine)
20 June 1965	Roanoke, US	daily low min	11.1 C (52.0 F)	0.6 C (1.1 F)	38 years	18 of 100 (Routine)
19 June 1965	Roanoke, US	daily low min (Tie)	9.4 C (48.9 F)	tie	6 years	1 of 100 (Routine)
16 June 1965	Roanoke, US	monthly low max	14.4 C (57.9 F)	0.6 C (1.1 F)	50 years	32 of 100 (Routine)
17 May 1965	Roanoke, US	daily high min	20.6 C (69.1 F)	2.3 C (4.1 F)	40 years	23 of 100 (Routine)
7 May 1965	Roanoke, US	daily rain	14.0 mm (0.6 in)	0.5 mm (0.02 in)	7 years	8 of 100 (Routine)
25 March 1965	Roanoke, US	daily rain	29.2 mm (1.1 in)	4.6 mm (0.18 in)	30 years	19 of 100 (Routine)
22 March 1965	Roanoke, US	daily low min (Tie)	-5.0 C (23.0 F)	tie	51 years	5 of 100 (Routine)
21 March 1965	Roanoke, US	daily low min	-10.0 C (14.0 F)	0.6 C (1.1 F)	51 years	22 of 100 (Routine)
14 February 1965	Roanoke, US	daily snowfall	12.2 cm (4.8 in)	4.6 cm (1.8 in)	21 years	17 of 100 (Routine)

Climate Trend

49 complete years, 1907 to 1963

One stripe for each of 49 complete years at Roanoke, 1907 to 1963. Blue stripes are years cooler than the station's own mean of 13.8 C (56.9 F); red stripes are warmer. The coolest year was 1917, at 12.5 C (54.5 F), and the warmest was 1921, at 15.2 C (59.4 F). The strongest colour marks a difference of 1.4 C (2.5 F).

Annual mean temperature at Roanoke as warming stripes, 1907 to 1963
Year	Annual mean temperature	Difference from the station mean
1907	13.8 C	-0.04 C
1912	12.8 C	-1.07 C
1913	13.9 C	+0.03 C
1914	13.1 C	-0.72 C
1915	13.6 C	-0.23 C
1917	12.5 C	-1.33 C
1918	13.6 C	-0.30 C
1919	14.3 C	+0.44 C
1921	15.2 C	+1.38 C
1922	14.6 C	+0.79 C
1923	14.1 C	+0.26 C
1924	12.9 C	-0.94 C
1925	14.3 C	+0.41 C
1926	13.7 C	-0.14 C
1927	14.3 C	+0.42 C
1928	14.1 C	+0.29 C
1929	14.2 C	+0.30 C
1930	14.6 C	+0.75 C
1932	14.5 C	+0.63 C
1933	14.8 C	+0.98 C
1934	13.8 C	-0.04 C
1935	13.5 C	-0.31 C
1936	13.8 C	-0.01 C
1937	13.4 C	-0.49 C
1938	14.2 C	+0.35 C
1939	14.3 C	+0.46 C
1940	12.9 C	-0.94 C
1941	14.3 C	+0.43 C
1942	13.9 C	+0.02 C
1943	13.9 C	+0.06 C
1944	13.7 C	-0.12 C
1945	14.0 C	+0.12 C
1946	14.2 C	+0.31 C
1947	13.1 C	-0.79 C
1949	14.3 C	+0.44 C
1950	13.5 C	-0.39 C
1951	13.5 C	-0.32 C
1952	14.1 C	+0.21 C
1953	14.7 C	+0.82 C
1954	14.3 C	+0.44 C
1955	14.0 C	+0.16 C
1956	14.4 C	+0.51 C
1957	14.2 C	+0.36 C
1958	13.0 C	-0.83 C
1959	14.4 C	+0.56 C
1960	13.0 C	-0.85 C
1961	13.5 C	-0.38 C
1962	13.1 C	-0.75 C
1963	12.7 C	-1.13 C

The fitted trend in annual mean temperature here over 1907 to 1963 is -0.02 C (-0.13 to 0.09) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.04 F (-0.24 to 0.17) per decade. The slope is a straight line fitted to 49 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Roanoke
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	-0.02 C (-0.13 to 0.09) per decade	-0.04 F (-0.24 to 0.17) per decade	1907 to 1963	49	Not clearly different from zero
Mean daily maximum	-0.05 C (-0.20 to 0.11) per decade	-0.1 F (-0.4 to 0.2) per decade	1907 to 1963	49	Not clearly different from zero
Mean daily minimum	0.01 C (-0.10 to 0.12) per decade	0.01 F (-0.18 to 0.21) per decade	1907 to 1963	49	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

1901 to 1965

Yearly extremes at Roanoke: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	41.1 C (106.0 F)	1954	36.7 C (98.1 F)	62
Coldest night (TNn)	-24.4 C (-11.9 F)	1917	-13.3 C (8.1 F)	62
Wettest day (Rx1day)	174.8 mm (6.9 in)	1954	71.3 mm (2.8 in)	62
Wettest five days (Rx5day)	253.0 mm (10.0 in)	1940	111.7 mm (4.4 in)	62
Longest dry spell (CDD)	33 days	1922	20 days	62

Hottest day (TXx)

The hottest day of the year at Roanoke, 1901 to 1965. The record is 41.1 C (106.0 F) in 1954, marked on the chart; the median year is 36.7 C (98.1 F).

Hottest day (TXx) at Roanoke by year
Year	Hottest day (TXx)
1901	26.7 C (80.1 F)
1902	36.7 C (98.1 F)
1903	33.9 C (93.0 F)
1904	36.7 C (98.1 F)
1905	35.0 C (95.0 F)
1906	37.2 C (99.0 F)
1907	36.7 C (98.1 F)
1908	37.2 C (99.0 F)
1912	35.6 C (96.1 F)
1913	35.0 C (95.0 F)
1914	36.7 C (98.1 F)
1915	36.1 C (97.0 F)
1916	34.4 C (93.9 F)
1917	36.1 C (97.0 F)
1918	38.3 C (100.9 F)
1919	34.4 C (93.9 F)
1920	33.3 C (91.9 F)
1921	35.6 C (96.1 F)
1922	33.3 C (91.9 F)
1923	36.7 C (98.1 F)
1924	36.1 C (97.0 F)
1925	37.2 C (99.0 F)
1926	40.0 C (104.0 F)
1927	37.8 C (100.0 F)
1928	37.2 C (99.0 F)
1929	36.7 C (98.1 F)
1930	40.6 C (105.1 F)
1931	38.3 C (100.9 F)
1932	40.0 C (104.0 F)
1933	37.8 C (100.0 F)
1934	38.3 C (100.9 F)
1935	37.8 C (100.0 F)
1936	40.6 C (105.1 F)
1937	36.1 C (97.0 F)
1938	35.6 C (96.1 F)
1939	36.7 C (98.1 F)
1940	37.2 C (99.0 F)
1941	37.2 C (99.0 F)
1942	38.3 C (100.9 F)
1943	37.2 C (99.0 F)
1944	36.1 C (97.0 F)
1945	37.8 C (100.0 F)
1946	35.6 C (96.1 F)
1947	36.7 C (98.1 F)
1948	36.7 C (98.1 F)
1949	35.6 C (96.1 F)
1950	33.3 C (91.9 F)
1951	35.6 C (96.1 F)
1952	38.3 C (100.9 F)
1953	38.9 C (102.0 F)
1954	41.1 C (106.0 F)
1955	36.7 C (98.1 F)
1956	36.7 C (98.1 F)
1957	36.1 C (97.0 F)
1958	35.6 C (96.1 F)
1959	37.2 C (99.0 F)
1960	35.6 C (96.1 F)
1961	35.0 C (95.0 F)
1962	35.0 C (95.0 F)
1963	36.7 C (98.1 F)
1964	18.9 C (66.0 F)
1965	35.6 C (96.1 F)

Coldest night (TNn)

The coldest night of the year at Roanoke, 1901 to 1965. The record is -24.4 C (-11.9 F) in 1917, marked on the chart; the median year is -13.3 C (8.1 F).

Coldest night (TNn) at Roanoke by year
Year	Coldest night (TNn)
1901	-15.0 C (5.0 F)
1902	-12.2 C (10.0 F)
1903	-13.9 C (7.0 F)
1904	-16.7 C (1.9 F)
1905	-15.0 C (5.0 F)
1906	-12.8 C (9.0 F)
1907	-15.6 C (3.9 F)
1908	-11.1 C (12.0 F)
1912	-22.2 C (-8.0 F)
1913	-10.6 C (12.9 F)
1914	-19.4 C (-2.9 F)
1915	-8.3 C (17.1 F)
1916	-15.0 C (5.0 F)
1917	-24.4 C (-11.9 F)
1918	-16.1 C (3.0 F)
1919	-13.3 C (8.1 F)
1920	-13.9 C (7.0 F)
1921	-11.7 C (10.9 F)
1922	-12.2 C (10.0 F)
1923	-11.1 C (12.0 F)
1924	-16.7 C (1.9 F)
1925	-15.6 C (3.9 F)
1926	-11.7 C (10.9 F)
1927	-13.3 C (8.1 F)
1928	-15.0 C (5.0 F)
1929	-13.3 C (8.1 F)
1930	-15.0 C (5.0 F)
1931	-12.2 C (10.0 F)
1932	-16.1 C (3.0 F)
1933	-13.3 C (8.1 F)
1934	-18.3 C (-0.9 F)
1935	-14.4 C (6.1 F)
1936	-18.3 C (-0.9 F)
1937	-12.2 C (10.0 F)
1938	-11.7 C (10.9 F)
1939	-10.6 C (12.9 F)
1940	-17.2 C (1.0 F)
1941	-10.6 C (12.9 F)
1942	-16.1 C (3.0 F)
1943	-13.3 C (8.1 F)
1944	-11.1 C (12.0 F)
1945	-10.6 C (12.9 F)
1946	-12.8 C (9.0 F)
1947	-12.8 C (9.0 F)
1948	-13.3 C (8.1 F)
1949	-10.6 C (12.9 F)
1950	-12.2 C (10.0 F)
1951	-13.9 C (7.0 F)
1952	-11.1 C (12.0 F)
1953	-9.4 C (15.1 F)
1954	-10.6 C (12.9 F)
1955	-13.9 C (7.0 F)
1956	-9.4 C (15.1 F)
1957	-12.8 C (9.0 F)
1958	-15.6 C (3.9 F)
1959	-13.3 C (8.1 F)
1960	-13.9 C (7.0 F)
1961	-13.3 C (8.1 F)
1962	-15.0 C (5.0 F)
1963	-18.3 C (-0.9 F)
1964	-12.8 C (9.0 F)
1965	-14.4 C (6.1 F)

Wettest day (Rx1day)

The wettest day of the year at Roanoke, 1901 to 1965. The record is 174.8 mm (6.9 in) in 1954, marked on the chart; the median year is 71.3 mm (2.8 in).

Wettest day (Rx1day) at Roanoke by year
Year	Wettest day (Rx1day)
1901	77.5 mm (3.1 in)
1902	74.9 mm (2.9 in)
1903	73.7 mm (2.9 in)
1904	46.2 mm (1.8 in)
1905	87.4 mm (3.4 in)
1906	57.2 mm (2.3 in)
1907	152.4 mm (6.0 in)
1908	71.1 mm (2.8 in)
1912	58.9 mm (2.3 in)
1913	50.3 mm (2.0 in)
1914	57.9 mm (2.3 in)
1915	102.9 mm (4.1 in)
1916	56.6 mm (2.2 in)
1917	44.2 mm (1.7 in)
1918	53.6 mm (2.1 in)
1919	49.0 mm (1.9 in)
1920	57.7 mm (2.3 in)
1921	70.1 mm (2.8 in)
1922	41.4 mm (1.6 in)
1923	68.6 mm (2.7 in)
1924	87.6 mm (3.4 in)
1925	41.9 mm (1.6 in)
1926	53.8 mm (2.1 in)
1927	47.8 mm (1.9 in)
1928	86.9 mm (3.4 in)
1929	102.4 mm (4.0 in)
1930	57.4 mm (2.3 in)
1931	73.9 mm (2.9 in)
1932	141.0 mm (5.6 in)
1933	43.2 mm (1.7 in)
1934	78.5 mm (3.1 in)
1935	97.3 mm (3.8 in)
1936	130.3 mm (5.1 in)
1937	73.2 mm (2.9 in)
1938	80.8 mm (3.2 in)
1939	116.8 mm (4.6 in)
1940	136.1 mm (5.4 in)
1941	47.2 mm (1.9 in)
1942	58.4 mm (2.3 in)
1943	73.7 mm (2.9 in)
1944	155.7 mm (6.1 in)
1945	132.8 mm (5.2 in)
1946	49.0 mm (1.9 in)
1947	96.0 mm (3.8 in)
1948	96.5 mm (3.8 in)
1949	74.9 mm (2.9 in)
1950	83.8 mm (3.3 in)
1951	44.7 mm (1.8 in)
1952	70.6 mm (2.8 in)
1953	48.3 mm (1.9 in)
1954	174.8 mm (6.9 in)
1955	66.8 mm (2.6 in)
1956	77.5 mm (3.1 in)
1957	77.2 mm (3.0 in)
1958	97.8 mm (3.9 in)
1959	87.6 mm (3.4 in)
1960	67.8 mm (2.7 in)
1961	46.5 mm (1.8 in)
1962	71.4 mm (2.8 in)
1963	68.1 mm (2.7 in)
1964	51.1 mm (2.0 in)
1965	71.1 mm (2.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Roanoke, 1901 to 1965. The record is 253.0 mm (10.0 in) in 1940, marked on the chart; the median year is 111.7 mm (4.4 in).

Wettest five days (Rx5day) at Roanoke by year
Year	Wettest five days (Rx5day)
1901	111.8 mm (4.4 in)
1902	126.0 mm (5.0 in)
1903	83.9 mm (3.3 in)
1904	118.3 mm (4.7 in)
1905	104.5 mm (4.1 in)
1906	142.3 mm (5.6 in)
1907	184.1 mm (7.2 in)
1908	132.1 mm (5.2 in)
1912	80.7 mm (3.2 in)
1913	106.9 mm (4.2 in)
1914	91.3 mm (3.6 in)
1915	136.0 mm (5.4 in)
1916	78.0 mm (3.1 in)
1917	77.9 mm (3.1 in)
1918	87.4 mm (3.4 in)
1919	95.8 mm (3.8 in)
1920	88.2 mm (3.5 in)
1921	137.4 mm (5.4 in)
1922	78.2 mm (3.1 in)
1923	150.2 mm (5.9 in)
1924	146.3 mm (5.8 in)
1925	51.8 mm (2.0 in)
1926	86.6 mm (3.4 in)
1927	107.0 mm (4.2 in)
1928	116.7 mm (4.6 in)
1929	175.3 mm (6.9 in)
1930	58.9 mm (2.3 in)
1931	129.9 mm (5.1 in)
1932	208.3 mm (8.2 in)
1933	90.0 mm (3.5 in)
1934	172.0 mm (6.8 in)
1935	124.3 mm (4.9 in)
1936	130.6 mm (5.1 in)
1937	113.8 mm (4.5 in)
1938	142.5 mm (5.6 in)
1939	125.0 mm (4.9 in)
1940	253.0 mm (10.0 in)
1941	77.5 mm (3.1 in)
1942	121.4 mm (4.8 in)
1943	86.0 mm (3.4 in)
1944	163.5 mm (6.4 in)
1945	216.8 mm (8.5 in)
1946	67.1 mm (2.6 in)
1947	122.0 mm (4.8 in)
1948	167.4 mm (6.6 in)
1949	106.1 mm (4.2 in)
1950	141.2 mm (5.6 in)
1951	78.7 mm (3.1 in)
1952	89.7 mm (3.5 in)
1953	67.4 mm (2.7 in)
1954	175.6 mm (6.9 in)
1955	79.0 mm (3.1 in)
1956	138.0 mm (5.4 in)
1957	111.5 mm (4.4 in)
1958	131.1 mm (5.2 in)
1959	140.4 mm (5.5 in)
1960	107.2 mm (4.2 in)
1961	96.7 mm (3.8 in)
1962	84.6 mm (3.3 in)
1963	69.4 mm (2.7 in)
1964	51.1 mm (2.0 in)
1965	72.4 mm (2.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Roanoke, 1901 to 1965. The record is 33 days in 1922, marked on the chart; the median year is 20 days.

Longest dry spell (CDD) at Roanoke by year
Year	Longest dry spell (CDD)
1901	18 days
1902	28 days
1903	21 days
1904	16 days
1905	15 days
1906	25 days
1907	27 days
1908	23 days
1912	18 days
1913	15 days
1914	25 days
1915	24 days
1916	16 days
1917	19 days
1918	20 days
1919	20 days
1920	26 days
1921	29 days
1922	33 days
1923	25 days
1924	25 days
1925	13 days
1926	21 days
1927	16 days
1928	17 days
1929	11 days
1930	29 days
1931	28 days
1932	16 days
1933	26 days
1934	22 days
1935	30 days
1936	18 days
1937	20 days
1938	23 days
1939	24 days
1940	16 days
1941	18 days
1942	27 days
1943	27 days
1944	24 days
1945	28 days
1946	29 days
1947	19 days
1948	15 days
1949	15 days
1950	18 days
1951	13 days
1952	30 days
1953	29 days
1954	20 days
1955	16 days
1956	20 days
1957	12 days
1958	25 days
1959	20 days
1960	17 days
1961	15 days
1962	15 days
1963	33 days
1964	6 days
1965	27 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

49 years with a frost

Across 49 years with a frost, the median last spring frost at Roanoke falls on 18 April and the median first autumn frost on 23 October, which leaves a median of 189 days between them.

Fitted over all years, the growing season changes by +1.7 days per decade at this station.

Frost dates and growing season at Roanoke
Measure	Median, all years	Earliest period	Recent period (1933 to 1963)	Recent against earliest	Fitted trend
Last spring frost	18 April	n/a	17 April	n/a	0.0 days per decade
First autumn frost	23 October	n/a	27 October	n/a	+1.6 days per decade
Growing days	189 days	n/a	188 days	n/a	+1.7 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

50 years, 1902 to 1965

A day with at least 69.7 mm (2.7 in) of rain is expected about once in 2 years. A day with at least 196.8 mm (7.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Roanoke: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	69.7 mm (2.7 in)
5 years	96.5 mm (3.8 in)
10 years	116.9 mm (4.6 in)
25 years	145.9 mm (5.7 in)
50 years	170.1 mm (6.7 in)
100 years	196.8 mm (7.7 in)	Longer than the 50 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, 50 years of values from 1902 to 1965.

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: 174.8 mm (6.9 in) in 1954; 155.7 mm (6.1 in) in 1944; 141.0 mm (5.6 in) in 1932.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Roanoke, at 1954. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 1954 ran 0.3 C (0.6 F) higher than in the years before (likely change).

Suspected changes in the annual mean temperature at Roanoke, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1954	+0.3	+0.6	likely	5

Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.

Download the Data

Data for Roanoke standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Roanoke 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 2026-10-17 (17 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).