Glen Lyn Weather Records (USC00443397)

Record envelope, standing records and threshold days for Glen Lyn (USC00443397), Virginia, United States, with 93 years of record.

Key Facts for Glen Lyn

Glen Lyn (USC00443397) is a weather station in Virginia, United States at 37.37 latitude and -80.86 longitude, 463 m (1,520 ft) above sea level.
The station reports from 1914 to 2006, 93 years of record.
1,464 records set at Glen Lyn still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Glen Lyn set a daily record precipitation of 31.5 mm (1.2 in) on 27 June 2006.

About the Station

Location: Virginia, United States, 37.37 latitude, -80.86 longitude.
Elevation: 463 m (1,520 ft).
Period of record: 1914 to 2006, 93 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 Glen Lyn. 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 Glen Lyn, 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)	-22.8 C (-9.0 F)	n/a	n/a
Feb	25.6 C (78.1 F)	-22.2 C (-8.0 F)	n/a	n/a
Mar	31.1 C (88.0 F)	-17.8 C (0.0 F)	n/a	n/a
Apr	32.2 C (90.0 F)	-6.7 C (19.9 F)	n/a	n/a
May	35.6 C (96.1 F)	-2.2 C (28.0 F)	n/a	n/a
Jun	40.0 C (104.0 F)	1.7 C (35.1 F)	n/a	n/a
Jul	38.9 C (102.0 F)	6.1 C (43.0 F)	n/a	n/a
Aug	37.2 C (99.0 F)	5.6 C (42.1 F)	n/a	n/a
Sep	36.7 C (98.1 F)	-1.1 C (30.0 F)	n/a	n/a
Oct	34.4 C (93.9 F)	-11.1 C (12.0 F)	n/a	n/a
Nov	30.0 C (86.0 F)	-14.4 C (6.1 F)	n/a	n/a
Dec	24.4 C (75.9 F)	-21.1 C (-6.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Glen Lyn still stand. 1954 holds the most, with 61.

Standing records at Glen Lyn by the year they were set
Year set	Standing records
1932	43
1933	38
1934	44
1935	38
1936	45
1937	39
1938	23
1939	47
1940	54
1941	42
1942	34
1943	48
1944	28
1945	47
1946	31
1947	41
1948	36
1949	46
1950	48
1951	34
1952	30
1953	43
1954	61
1955	44
1956	35
1957	34
1958	18
1959	28
1960	36
1961	35
1962	34
1963	25
1964	39
1965	30
1966	23
1967	33
1968	21
1969	27
1970	18
1971	4
1974	7
1975	3
1976	10
1977	5
1978	12
1980	3

All-Time Record Progression

2 new records

2 all-time records were set at Glen Lyn between 30 January 1966 and 29 June 1969. Each dot is a new record.

When Glen Lyn set new all-time records
Date	Kind	Detail
1966-01-30	Record snow depth	Record snow depth 45.7 cm (18.0 in)
1969-06-29	Record high maximum temperature	Record high maximum temperature 40.0 C (104.0 F)

Wettest Day of Each Month

Oct: 120.4 mm (4.7 in)

The wettest day on record for each calendar month at Glen Lyn. The most was 120.4 mm (4.7 in) on 2 October 1929.

Record daily precipitation for each month at Glen Lyn
Month	Record daily precipitation (mm)	Date
Jan	68.6 mm (2.7 in)	28 January 1998
Feb	52.1 mm (2.1 in)	23 February 1984
Mar	58.4 mm (2.3 in)	1 March 1954
Apr	65.0 mm (2.6 in)	25 April 1987
May	65.8 mm (2.6 in)	16 May 2001
Jun	81.3 mm (3.2 in)	17 June 1949
Jul	104.1 mm (4.1 in)	8 July 1935
Aug	74.4 mm (2.9 in)	19 August 1989
Sep	82.8 mm (3.3 in)	14 September 1966
Oct	120.4 mm (4.7 in)	2 October 1929
Nov	65.8 mm (2.6 in)	10 November 1962
Dec	53.3 mm (2.1 in)	22 December 1926

Period of Record Coverage

1932 to 1980

45 years of record at Glen Lyn, 1932 to 1980. 8 years have data for under 90 percent of days and are left out of rankings: 1969, 1971, 1974, 1975, 1976, 1977, 1978, 1980.

Days with data per year at Glen Lyn
Year	Days with data	Share of year	Complete
1932	345	94%	Yes
1933	347	95%	Yes
1934	351	96%	Yes
1935	348	95%	Yes
1936	337	92%	Yes
1937	332	91%	Yes
1938	337	92%	Yes
1939	342	94%	Yes
1940	336	92%	Yes
1941	359	98%	Yes
1942	341	93%	Yes
1943	342	94%	Yes
1944	354	97%	Yes
1945	355	97%	Yes
1946	358	98%	Yes
1947	356	98%	Yes
1948	361	99%	Yes
1949	365	100%	Yes
1950	364	100%	Yes
1951	357	98%	Yes
1952	365	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	365	100%	Yes
1956	365	100%	Yes
1957	361	99%	Yes
1958	365	100%	Yes
1959	363	99%	Yes
1960	364	99%	Yes
1961	365	100%	Yes
1962	363	99%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	358	98%	Yes
1966	356	98%	Yes
1967	364	100%	Yes
1968	361	99%	Yes
1969	293	80%	No
1971	31	8%	No
1974	60	16%	No
1975	50	14%	No
1976	88	24%	No
1977	28	8%	No
1978	115	32%	No
1980	30	8%	No

Latest Records

Latest records at Glen Lyn
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
27 June 2006	Glen Lyn, US	daily rain	31.5 mm (1.2 in)	3.3 mm (0.13 in)	4 years	13 of 100 (Routine)
26 June 2006	Glen Lyn, US	daily rain	38.6 mm (1.5 in)	0.5 mm (0.02 in)	92 years	36 of 100 (Notable)
25 June 2006	Glen Lyn, US	daily rain	47.2 mm (1.9 in)	15.4 mm (0.6 in)	80 years	48 of 100 (Notable)
6 June 2006	Glen Lyn, US	daily rain	48.3 mm (1.9 in)	16.5 mm (0.6 in)	5 years	26 of 100 (Routine)
13 February 2006	Glen Lyn, US	daily snow depth	12.7 cm (5.0 in)	2.5 cm (1.0 in)	43 years	24 of 100 (Routine)
12 February 2006	Glen Lyn, US	daily snow depth	15.2 cm (6.0 in)	5.0 cm (2.0 in)	70 years	36 of 100 (Notable)
12 February 2006	Glen Lyn, US	daily snowfall	14.0 cm (5.5 in)	8.9 cm (3.5 in)	43 years	34 of 100 (Routine)
29 November 2005	Glen Lyn, US	daily rain	36.6 mm (1.4 in)	1.3 mm (0.05 in)	56 years	27 of 100 (Routine)
23 December 2004	Glen Lyn, US	daily rain	44.7 mm (1.8 in)	28.4 mm (1.1 in)	75 years	66 of 100 (Major)
1 December 2004	Glen Lyn, US	daily rain	41.4 mm (1.6 in)	9.1 mm (0.36 in)	13 years	23 of 100 (Routine)
9 September 2004	Glen Lyn, US	daily rain	42.4 mm (1.7 in)	34.8 mm (1.4 in)	90 years	66 of 100 (Major)
8 September 2004	Glen Lyn, US	daily rain	43.2 mm (1.7 in)	20.1 mm (0.8 in)	17 years	31 of 100 (Routine)
30 August 2004	Glen Lyn, US	daily rain	35.8 mm (1.4 in)	17.3 mm (0.7 in)	45 years	37 of 100 (Notable)
31 May 2004	Glen Lyn, US	daily rain	34.0 mm (1.3 in)	3.8 mm (0.15 in)	54 years	29 of 100 (Routine)
27 May 2004	Glen Lyn, US	daily rain	30.7 mm (1.2 in)	9.1 mm (0.36 in)	89 years	45 of 100 (Notable)
19 November 2003	Glen Lyn, US	daily rain	50.8 mm (2.0 in)	13.2 mm (0.5 in)	88 years	49 of 100 (Notable)
6 November 2003	Glen Lyn, US	daily rain	19.1 mm (0.8 in)	2.8 mm (0.11 in)	0 years	12 of 100 (Routine)
28 September 2003	Glen Lyn, US	daily rain	78.7 mm (3.1 in)	36.8 mm (1.4 in)	36 years	52 of 100 (Notable)
19 September 2003	Glen Lyn, US	daily rain	33.0 mm (1.3 in)	11.4 mm (0.4 in)	76 years	41 of 100 (Notable)
3 July 2003	Glen Lyn, US	daily rain	47.8 mm (1.9 in)	3.1 mm (0.12 in)	1 year	11 of 100 (Routine)

Climate Trend

37 complete years, 1932 to 1968

One stripe for each of 37 complete years at Glen Lyn, 1932 to 1968. Blue stripes are years cooler than the station's own mean of 13.0 C (55.5 F); red stripes are warmer. The coolest year was 1940, at 11.7 C (53.1 F), and the warmest was 1953, at 14.0 C (57.1 F). The strongest colour marks a difference of 1.4 C (2.5 F).

Annual mean temperature at Glen Lyn as warming stripes, 1932 to 1968
Year	Annual mean temperature	Difference from the station mean
1932	13.4 C	+0.35 C
1933	13.6 C	+0.57 C
1934	12.9 C	-0.11 C
1935	13.0 C	-0.04 C
1936	13.1 C	+0.03 C
1937	12.3 C	-0.71 C
1938	13.6 C	+0.54 C
1939	13.4 C	+0.36 C
1940	11.7 C	-1.32 C
1941	13.3 C	+0.24 C
1942	12.9 C	-0.17 C
1943	12.5 C	-0.58 C
1944	12.3 C	-0.80 C
1945	12.6 C	-0.45 C
1946	13.3 C	+0.27 C
1947	12.1 C	-0.91 C
1948	12.7 C	-0.40 C
1949	13.4 C	+0.31 C
1950	13.2 C	+0.11 C
1951	13.4 C	+0.35 C
1952	13.8 C	+0.72 C
1953	14.0 C	+0.92 C
1954	13.4 C	+0.39 C
1955	13.5 C	+0.42 C
1956	13.5 C	+0.46 C
1957	13.9 C	+0.83 C
1958	12.2 C	-0.87 C
1959	13.8 C	+0.72 C
1960	12.8 C	-0.26 C
1961	13.3 C	+0.28 C
1962	13.1 C	+0.08 C
1963	12.4 C	-0.68 C
1964	13.5 C	+0.42 C
1965	13.8 C	+0.70 C
1966	12.5 C	-0.58 C
1967	12.6 C	-0.42 C
1968	12.2 C	-0.82 C

The fitted trend in annual mean temperature here over 1932 to 1968 is 0.01 C (-0.17 to 0.19) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.02 F (-0.31 to 0.35) per decade. The slope is a straight line fitted to 37 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Glen Lyn
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.01 C (-0.17 to 0.19) per decade	0.02 F (-0.31 to 0.35) per decade	1932 to 1968	37	Not clearly different from zero
Mean daily maximum	0.05 C (-0.21 to 0.31) per decade	0.1 F (-0.4 to 0.6) per decade	1932 to 1968	37	Not clearly different from zero
Mean daily minimum	-0.03 C (-0.23 to 0.18) per decade	-0.05 F (-0.42 to 0.32) per decade	1932 to 1968	37	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

1914 to 2006

Yearly extremes at Glen Lyn: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.0 C (104.0 F)	1969	35.6 C (96.1 F)	45
Coldest night (TNn)	-22.8 C (-9.0 F)	1936	-16.9 C (1.5 F)	46
Wettest day (Rx1day)	120.4 mm (4.7 in)	1929	50.5 mm (2.0 in)	91
Wettest five days (Rx5day)	178.8 mm (7.0 in)	1916	84.1 mm (3.3 in)	91
Longest dry spell (CDD)	42 days	2000	20 days	91

Hottest day (TXx)

The hottest day of the year at Glen Lyn, 1914 to 2006. The record is 40.0 C (104.0 F) in 1969, marked on the chart; the median year is 35.6 C (96.1 F).

Hottest day (TXx) at Glen Lyn by year
Year	Hottest day (TXx)
1914	n/a
1915	n/a
1916	n/a
1917	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	35.6 C (96.1 F)
1933	36.7 C (98.1 F)
1934	37.8 C (100.0 F)
1935	34.4 C (93.9 F)
1936	37.8 C (100.0 F)
1937	33.3 C (91.9 F)
1938	35.0 C (95.0 F)
1939	36.7 C (98.1 F)
1940	35.6 C (96.1 F)
1941	36.1 C (97.0 F)
1942	36.1 C (97.0 F)
1943	36.1 C (97.0 F)
1944	36.7 C (98.1 F)
1945	37.2 C (99.0 F)
1946	33.9 C (93.0 F)
1947	35.6 C (96.1 F)
1948	34.4 C (93.9 F)
1949	34.4 C (93.9 F)
1950	32.2 C (90.0 F)
1951	34.4 C (93.9 F)
1952	37.8 C (100.0 F)
1953	36.7 C (98.1 F)
1954	38.9 C (102.0 F)
1955	37.2 C (99.0 F)
1956	34.4 C (93.9 F)
1957	35.6 C (96.1 F)
1958	35.0 C (95.0 F)
1959	37.2 C (99.0 F)
1960	33.9 C (93.0 F)
1961	35.0 C (95.0 F)
1962	35.0 C (95.0 F)
1963	36.7 C (98.1 F)
1964	36.1 C (97.0 F)
1965	35.6 C (96.1 F)
1966	36.1 C (97.0 F)
1967	34.4 C (93.9 F)
1968	37.8 C (100.0 F)
1969	40.0 C (104.0 F)
1970	n/a
1971	28.3 C (82.9 F)
1972	n/a
1973	n/a
1974	33.9 C (93.0 F)
1975	32.8 C (91.0 F)
1976	30.6 C (87.1 F)
1977	30.0 C (86.0 F)
1978	25.0 C (77.0 F)
1979	n/a
1980	34.4 C (93.9 F)
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a

Coldest night (TNn)

The coldest night of the year at Glen Lyn, 1914 to 2006. The record is -22.8 C (-9.0 F) in 1936, marked on the chart; the median year is -16.9 C (1.5 F).

Coldest night (TNn) at Glen Lyn by year
Year	Coldest night (TNn)
1914	n/a
1915	n/a
1916	n/a
1917	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	-16.1 C (3.0 F)
1933	-17.8 C (0.0 F)
1934	-20.0 C (-4.0 F)
1935	-20.0 C (-4.0 F)
1936	-22.8 C (-9.0 F)
1937	-13.3 C (8.1 F)
1938	-13.3 C (8.1 F)
1939	-15.0 C (5.0 F)
1940	-20.6 C (-5.1 F)
1941	-14.4 C (6.1 F)
1942	-20.6 C (-5.1 F)
1943	-16.1 C (3.0 F)
1944	-16.7 C (1.9 F)
1945	-17.8 C (0.0 F)
1946	-13.3 C (8.1 F)
1947	-15.6 C (3.9 F)
1948	-18.9 C (-2.0 F)
1949	-11.7 C (10.9 F)
1950	-14.4 C (6.1 F)
1951	-17.2 C (1.0 F)
1952	-12.2 C (10.0 F)
1953	-14.4 C (6.1 F)
1954	-14.4 C (6.1 F)
1955	-16.1 C (3.0 F)
1956	-13.3 C (8.1 F)
1957	-15.6 C (3.9 F)
1958	-17.8 C (0.0 F)
1959	-18.3 C (-0.9 F)
1960	-17.8 C (0.0 F)
1961	-17.8 C (0.0 F)
1962	-21.1 C (-6.0 F)
1963	-22.8 C (-9.0 F)
1964	-17.8 C (0.0 F)
1965	-18.3 C (-0.9 F)
1966	-18.9 C (-2.0 F)
1967	-18.3 C (-0.9 F)
1968	-18.3 C (-0.9 F)
1969	-17.8 C (0.0 F)
1970	-22.2 C (-8.0 F)
1971	1.7 C (35.1 F)
1972	n/a
1973	n/a
1974	6.7 C (44.1 F)
1975	7.2 C (45.0 F)
1976	-16.7 C (1.9 F)
1977	-4.4 C (24.1 F)
1978	-22.2 C (-8.0 F)
1979	n/a
1980	6.1 C (43.0 F)
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a

Wettest day (Rx1day)

The wettest day of the year at Glen Lyn, 1914 to 2006. The record is 120.4 mm (4.7 in) in 1929, marked on the chart; the median year is 50.5 mm (2.0 in).

Wettest day (Rx1day) at Glen Lyn by year
Year	Wettest day (Rx1day)
1914	63.5 mm (2.5 in)
1915	64.8 mm (2.6 in)
1916	78.7 mm (3.1 in)
1917	50.8 mm (2.0 in)
1920	54.6 mm (2.1 in)
1921	47.0 mm (1.9 in)
1922	47.5 mm (1.9 in)
1923	50.5 mm (2.0 in)
1924	35.1 mm (1.4 in)
1925	47.0 mm (1.9 in)
1926	58.4 mm (2.3 in)
1927	47.0 mm (1.9 in)
1928	48.3 mm (1.9 in)
1929	120.4 mm (4.7 in)
1930	39.4 mm (1.6 in)
1931	42.7 mm (1.7 in)
1932	54.9 mm (2.2 in)
1933	51.8 mm (2.0 in)
1934	59.2 mm (2.3 in)
1935	104.1 mm (4.1 in)
1936	58.4 mm (2.3 in)
1937	51.8 mm (2.0 in)
1938	43.2 mm (1.7 in)
1939	41.9 mm (1.6 in)
1940	50.3 mm (2.0 in)
1941	50.8 mm (2.0 in)
1942	49.8 mm (2.0 in)
1943	56.9 mm (2.2 in)
1944	54.9 mm (2.2 in)
1945	55.4 mm (2.2 in)
1946	44.5 mm (1.8 in)
1947	38.1 mm (1.5 in)
1948	50.3 mm (2.0 in)
1949	81.3 mm (3.2 in)
1950	50.8 mm (2.0 in)
1951	27.7 mm (1.1 in)
1952	42.7 mm (1.7 in)
1953	52.6 mm (2.1 in)
1954	71.6 mm (2.8 in)
1955	35.6 mm (1.4 in)
1956	52.1 mm (2.1 in)
1957	43.2 mm (1.7 in)
1958	41.9 mm (1.6 in)
1959	73.7 mm (2.9 in)
1960	33.0 mm (1.3 in)
1961	45.0 mm (1.8 in)
1962	65.8 mm (2.6 in)
1963	55.9 mm (2.2 in)
1964	33.3 mm (1.3 in)
1965	45.7 mm (1.8 in)
1966	82.8 mm (3.3 in)
1967	59.7 mm (2.4 in)
1968	43.9 mm (1.7 in)
1969	33.5 mm (1.3 in)
1970	36.1 mm (1.4 in)
1971	38.1 mm (1.5 in)
1972	57.7 mm (2.3 in)
1973	58.4 mm (2.3 in)
1974	65.3 mm (2.6 in)
1975	38.1 mm (1.5 in)
1976	49.5 mm (1.9 in)
1977	55.4 mm (2.2 in)
1978	44.5 mm (1.8 in)
1979	50.3 mm (2.0 in)
1980	48.3 mm (1.9 in)
1981	47.2 mm (1.9 in)
1982	50.8 mm (2.0 in)
1983	36.1 mm (1.4 in)
1984	52.1 mm (2.1 in)
1985	73.7 mm (2.9 in)
1986	71.9 mm (2.8 in)
1987	65.0 mm (2.6 in)
1988	50.3 mm (2.0 in)
1989	74.4 mm (2.9 in)
1990	49.5 mm (1.9 in)
1991	38.6 mm (1.5 in)
1992	71.4 mm (2.8 in)
1993	45.2 mm (1.8 in)
1994	34.3 mm (1.4 in)
1995	61.0 mm (2.4 in)
1996	58.4 mm (2.3 in)
1997	32.5 mm (1.3 in)
1998	68.6 mm (2.7 in)
1999	44.5 mm (1.8 in)
2000	42.2 mm (1.7 in)
2001	72.1 mm (2.8 in)
2002	63.8 mm (2.5 in)
2003	78.7 mm (3.1 in)
2004	44.7 mm (1.8 in)
2005	59.7 mm (2.4 in)
2006	48.3 mm (1.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Glen Lyn, 1914 to 2006. The record is 178.8 mm (7.0 in) in 1916, marked on the chart; the median year is 84.1 mm (3.3 in).

Wettest five days (Rx5day) at Glen Lyn by year
Year	Wettest five days (Rx5day)
1914	77.5 mm (3.1 in)
1915	67.2 mm (2.6 in)
1916	178.8 mm (7.0 in)
1917	72.1 mm (2.8 in)
1920	149.8 mm (5.9 in)
1921	87.6 mm (3.4 in)
1922	63.0 mm (2.5 in)
1923	47.0 mm (1.9 in)
1924	62.2 mm (2.4 in)
1925	52.9 mm (2.1 in)
1926	86.3 mm (3.4 in)
1927	76.4 mm (3.0 in)
1928	89.5 mm (3.5 in)
1929	138.9 mm (5.5 in)
1930	46.2 mm (1.8 in)
1931	96.3 mm (3.8 in)
1932	67.1 mm (2.6 in)
1933	95.2 mm (3.7 in)
1934	74.7 mm (2.9 in)
1935	129.8 mm (5.1 in)
1936	68.3 mm (2.7 in)
1937	84.1 mm (3.3 in)
1938	81.0 mm (3.2 in)
1939	51.6 mm (2.0 in)
1940	99.6 mm (3.9 in)
1941	110.3 mm (4.3 in)
1942	86.4 mm (3.4 in)
1943	67.1 mm (2.6 in)
1944	61.5 mm (2.4 in)
1945	135.2 mm (5.3 in)
1946	56.7 mm (2.2 in)
1947	87.7 mm (3.5 in)
1948	110.8 mm (4.4 in)
1949	108.7 mm (4.3 in)
1950	97.5 mm (3.8 in)
1951	43.4 mm (1.7 in)
1952	65.1 mm (2.6 in)
1953	68.1 mm (2.7 in)
1954	80.6 mm (3.2 in)
1955	90.3 mm (3.6 in)
1956	80.5 mm (3.2 in)
1957	102.7 mm (4.0 in)
1958	64.3 mm (2.5 in)
1959	99.4 mm (3.9 in)
1960	54.1 mm (2.1 in)
1961	85.4 mm (3.4 in)
1962	91.2 mm (3.6 in)
1963	58.7 mm (2.3 in)
1964	69.6 mm (2.7 in)
1965	86.1 mm (3.4 in)
1966	89.4 mm (3.5 in)
1967	83.9 mm (3.3 in)
1968	57.1 mm (2.2 in)
1969	52.6 mm (2.1 in)
1970	74.2 mm (2.9 in)
1971	74.6 mm (2.9 in)
1972	112.5 mm (4.4 in)
1973	91.4 mm (3.6 in)
1974	98.8 mm (3.9 in)
1975	69.8 mm (2.7 in)
1976	96.7 mm (3.8 in)
1977	97.0 mm (3.8 in)
1978	85.4 mm (3.4 in)
1979	74.4 mm (2.9 in)
1980	73.4 mm (2.9 in)
1981	73.8 mm (2.9 in)
1982	100.1 mm (3.9 in)
1983	58.2 mm (2.3 in)
1984	78.5 mm (3.1 in)
1985	116.9 mm (4.6 in)
1986	119.6 mm (4.7 in)
1987	126.8 mm (5.0 in)
1988	55.4 mm (2.2 in)
1989	131.8 mm (5.2 in)
1990	98.6 mm (3.9 in)
1991	84.3 mm (3.3 in)
1992	93.5 mm (3.7 in)
1993	71.7 mm (2.8 in)
1994	72.6 mm (2.9 in)
1995	87.4 mm (3.4 in)
1996	87.4 mm (3.4 in)
1997	47.7 mm (1.9 in)
1998	81.8 mm (3.2 in)
1999	58.2 mm (2.3 in)
2000	62.2 mm (2.4 in)
2001	157.8 mm (6.2 in)
2002	99.6 mm (3.9 in)
2003	89.9 mm (3.5 in)
2004	85.6 mm (3.4 in)
2005	71.1 mm (2.8 in)
2006	147.0 mm (5.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Glen Lyn, 1914 to 2006. The record is 42 days in 2000, marked on the chart; the median year is 20 days.

Longest dry spell (CDD) at Glen Lyn by year
Year	Longest dry spell (CDD)
1914	29 days
1915	34 days
1916	37 days
1917	21 days
1920	27 days
1921	33 days
1922	36 days
1923	27 days
1924	27 days
1925	27 days
1926	29 days
1927	14 days
1928	16 days
1929	15 days
1930	19 days
1931	18 days
1932	15 days
1933	12 days
1934	20 days
1935	23 days
1936	20 days
1937	10 days
1938	20 days
1939	24 days
1940	16 days
1941	17 days
1942	17 days
1943	20 days
1944	19 days
1945	14 days
1946	13 days
1947	15 days
1948	18 days
1949	25 days
1950	17 days
1951	24 days
1952	24 days
1953	30 days
1954	19 days
1955	15 days
1956	20 days
1957	16 days
1958	26 days
1959	20 days
1960	12 days
1961	13 days
1962	12 days
1963	29 days
1964	13 days
1965	19 days
1966	21 days
1967	23 days
1968	29 days
1969	16 days
1970	29 days
1971	16 days
1972	11 days
1973	22 days
1974	16 days
1975	17 days
1976	20 days
1977	21 days
1978	29 days
1979	14 days
1980	17 days
1981	18 days
1982	20 days
1983	16 days
1984	18 days
1985	17 days
1986	20 days
1987	18 days
1988	15 days
1989	18 days
1990	21 days
1991	24 days
1992	21 days
1993	17 days
1994	14 days
1995	20 days
1996	13 days
1997	21 days
1998	24 days
1999	23 days
2000	42 days
2001	42 days
2002	23 days
2003	14 days
2004	27 days
2005	29 days
2006	13 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

37 years with a frost

Across 37 years with a frost, the median last spring frost at Glen Lyn falls on 24 April and the median first autumn frost on 16 October, which leaves a median of 173 days between them.

Fitted over all years, the growing season changes by +1.0 days per decade at this station.

Frost dates and growing season at Glen Lyn
Measure	Median, all years	Earliest period	Recent period (1939 to 1968)	Recent against earliest	Fitted trend
Last spring frost	24 April	n/a	24 April	n/a	+1.0 days per decade
First autumn frost	16 October	n/a	18 October	n/a	+2.1 days per decade
Growing days	173 days	n/a	174 days	n/a	+1.0 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

80 years, 1916 to 2005

A day with at least 50.8 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 106.1 mm (4.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Glen Lyn: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	50.8 mm (2.0 in)
5 years	64.6 mm (2.5 in)
10 years	74.2 mm (2.9 in)
25 years	86.7 mm (3.4 in)
50 years	96.3 mm (3.8 in)
100 years	106.1 mm (4.2 in)	Longer than the 80 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, 80 years of values from 1916 to 2005.

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: 120.4 mm (4.7 in) in 1929; 104.1 mm (4.1 in) in 1935; 82.8 mm (3.3 in) in 1966.

Download the Data

Data for Glen Lyn standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Glen Lyn 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).