Grayson 3 SW Weather Records (USC00153391)

Record envelope, standing records and threshold days for Grayson 3 SW (USC00153391), Kentucky, United States, with 77 years of record.

Key Facts for Grayson 3 SW

Grayson 3 SW (USC00153391) is a weather station in Kentucky, United States at 38.29 latitude and -82.97 longitude, 213 m (700 ft) above sea level.
The station reports from 1925 to 2001, 77 years of record.
1,464 records set at Grayson 3 SW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Grayson 3 SW set a daily record low maximum temperature of 17.2 C (63.0 F) on 21 September 2001.

About the Station

Location: Kentucky, United States, 38.29 latitude, -82.97 longitude.
Elevation: 213 m (700 ft).
Period of record: 1925 to 2001, 77 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 Grayson 3 SW. 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 Grayson 3 SW, 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)	-35.0 C (-31.0 F)	n/a	n/a
Feb	25.6 C (78.1 F)	-30.0 C (-22.0 F)	n/a	n/a
Mar	30.0 C (86.0 F)	-23.3 C (-9.9 F)	n/a	n/a
Apr	32.8 C (91.0 F)	-9.4 C (15.1 F)	n/a	n/a
May	35.0 C (95.0 F)	-3.3 C (26.1 F)	n/a	n/a
Jun	38.9 C (102.0 F)	1.7 C (35.1 F)	n/a	n/a
Jul	40.6 C (105.1 F)	4.4 C (39.9 F)	n/a	n/a
Aug	38.9 C (102.0 F)	1.7 C (35.1 F)	n/a	n/a
Sep	39.4 C (102.9 F)	-1.1 C (30.0 F)	n/a	n/a
Oct	32.8 C (91.0 F)	-10.0 C (14.0 F)	n/a	n/a
Nov	31.1 C (88.0 F)	-16.7 C (1.9 F)	n/a	n/a
Dec	26.7 C (80.1 F)	-27.8 C (-18.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Grayson 3 SW still stand. 1954 holds the most, with 60.

Standing records at Grayson 3 SW by the year they were set
Year set	Standing records
1950	14
1951	55
1952	44
1953	43
1954	60
1955	44
1956	45
1957	46
1958	16
1969	20
1970	37
1971	36
1972	40
1973	26
1974	27
1975	26
1976	36
1977	55
1978	35
1979	35
1980	29
1981	17
1982	40
1983	38
1984	43
1985	33
1986	58
1987	25
1988	56
1989	49
1990	24
1991	48
1992	25
1993	29
1994	24
1995	16
1996	36
1997	31
1998	38
1999	26
2000	21
2001	18

All-Time Record Progression

6 new records

6 all-time records were set at Grayson 3 SW between 20 July 1988 and 2 March 1997. Each dot is a new record.

When Grayson 3 SW set new all-time records
Date	Kind	Detail
1988-07-20	Record daily precipitation	Record daily precipitation 102.1 mm (4.0 in)
1993-03-14	Record daily snowfall	Record daily snowfall 27.9 cm (11.0 in)
1994-01-19	Record low maximum temperature	Record low maximum temperature -16.1 C (3.0 F)
1994-01-19	Record low minimum temperature	Record low minimum temperature -33.9 C (-29.0 F)
1994-01-20	Record low minimum temperature	Record low minimum temperature -35.0 C (-31.0 F)
1997-03-02	Record daily precipitation	Record daily precipitation 109.2 mm (4.3 in)

Wettest Day of Each Month

Mar: 109.2 mm (4.3 in)

The wettest day on record for each calendar month at Grayson 3 SW. The most was 109.2 mm (4.3 in) on 2 March 1997.

Record daily precipitation for each month at Grayson 3 SW
Month	Record daily precipitation (mm)	Date
Jan	44.2 mm (1.7 in)	8 January 1998
Feb	57.2 mm (2.3 in)	19 February 2000
Mar	109.2 mm (4.3 in)	2 March 1997
Apr	58.9 mm (2.3 in)	22 April 1972
May	62.0 mm (2.4 in)	30 May 1982
Jun	74.4 mm (2.9 in)	5 June 1993
Jul	102.1 mm (4.0 in)	20 July 1988
Aug	81.3 mm (3.2 in)	25 August 1999
Sep	81.5 mm (3.2 in)	20 September 1954
Oct	95.8 mm (3.8 in)	13 October 1926
Nov	75.9 mm (3.0 in)	20 November 1988
Dec	89.7 mm (3.5 in)	9 December 1978

Period of Record Coverage

1950 to 2001

42 years of record at Grayson 3 SW, 1950 to 2001. 8 years have data for under 90 percent of days and are left out of rankings: 1950, 1953, 1958, 1969, 1975, 1976, 1985, 2001.

Days with data per year at Grayson 3 SW
Year	Days with data	Share of year	Complete
1950	92	25%	No
1951	363	99%	Yes
1952	358	98%	Yes
1953	326	89%	No
1954	360	99%	Yes
1955	342	94%	Yes
1956	359	98%	Yes
1957	347	95%	Yes
1958	208	57%	No
1969	275	75%	No
1970	365	100%	Yes
1971	363	99%	Yes
1972	365	100%	Yes
1973	363	99%	Yes
1974	365	100%	Yes
1975	325	89%	No
1976	255	70%	No
1977	362	99%	Yes
1978	355	97%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	363	99%	Yes
1983	365	100%	Yes
1984	366	100%	Yes
1985	285	78%	No
1986	362	99%	Yes
1987	365	100%	Yes
1988	362	99%	Yes
1989	364	100%	Yes
1990	365	100%	Yes
1991	363	99%	Yes
1992	366	100%	Yes
1993	360	99%	Yes
1994	362	99%	Yes
1995	365	100%	Yes
1996	365	100%	Yes
1997	364	100%	Yes
1998	365	100%	Yes
1999	364	100%	Yes
2000	358	98%	Yes
2001	201	55%	No

Latest Records

Latest records at Grayson 3 SW
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 September 2001	Grayson 3 SW, US	daily low max	17.2 C (63.0 F)	1.7 C (3.1 F)	10 years	11 of 100 (Routine)
12 August 2001	Grayson 3 SW, US	daily high max	35.6 C (96.1 F)	1.2 C (2.2 F)	12 years	11 of 100 (Routine)
18 July 2001	Grayson 3 SW, US	daily low min (Tie)	9.4 C (48.9 F)	tie	12 years	2 of 100 (Routine)
16 June 2001	Grayson 3 SW, US	daily high min (Tie)	19.4 C (66.9 F)	tie	44 years	4 of 100 (Routine)
7 June 2001	Grayson 3 SW, US	daily rain	21.6 mm (0.9 in)	6.9 mm (0.27 in)	48 years	20 of 100 (Routine)
25 May 2001	Grayson 3 SW, US	daily low max	15.6 C (60.1 F)	2.2 C (4.0 F)	22 years	15 of 100 (Routine)
19 May 2001	Grayson 3 SW, US	daily rain	58.2 mm (2.3 in)	30.0 mm (1.2 in)	20 years	41 of 100 (Notable)
19 May 2001	Grayson 3 SW, US	daily high min (Tie)	18.3 C (64.9 F)	tie	10 years	2 of 100 (Routine)
18 May 2001	Grayson 3 SW, US	daily high min (Tie)	17.8 C (64.0 F)	tie	10 years	2 of 100 (Routine)
17 May 2001	Grayson 3 SW, US	daily rain	38.6 mm (1.5 in)	19.0 mm (0.7 in)	8 years	27 of 100 (Routine)
17 May 2001	Grayson 3 SW, US	daily high min (Tie)	15.6 C (60.1 F)	tie	15 years	2 of 100 (Routine)
7 May 2001	Grayson 3 SW, US	daily high max (Tie)	31.7 C (89.1 F)	tie	32 years	3 of 100 (Routine)
27 April 2001	Grayson 3 SW, US	daily low min (Tie)	-2.2 C (28.0 F)	tie	8 years	1 of 100 (Routine)
24 April 2001	Grayson 3 SW, US	daily high max	31.7 C (89.1 F)	0.6 C (1.1 F)	44 years	18 of 100 (Routine)
22 April 2001	Grayson 3 SW, US	daily low min (Tie)	-3.3 C (26.1 F)	tie	18 years	2 of 100 (Routine)
13 April 2001	Grayson 3 SW, US	daily high min	14.4 C (57.9 F)	1.6 C (2.9 F)	28 years	16 of 100 (Routine)
13 April 2001	Grayson 3 SW, US	daily high max	30.6 C (87.1 F)	1.2 C (2.2 F)	24 years	13 of 100 (Routine)
12 April 2001	Grayson 3 SW, US	daily high min	15.0 C (59.0 F)	2.2 C (4.0 F)	20 years	15 of 100 (Routine)
12 April 2001	Grayson 3 SW, US	daily high max	31.7 C (89.1 F)	2.3 C (4.1 F)	6 years	9 of 100 (Routine)
11 April 2001	Grayson 3 SW, US	daily high max	29.4 C (84.9 F)	0.5 C (0.9 F)	23 years	11 of 100 (Routine)

Climate Trend

32 complete years, 1951 to 2000

One stripe for each of 32 complete years at Grayson 3 SW, 1951 to 2000. Blue stripes are years cooler than the station's own mean of 11.8 C (53.3 F); red stripes are warmer. The coolest year was 1996, at 10.7 C (51.2 F), and the warmest was 1954, at 13.3 C (55.9 F). The strongest colour marks a difference of 1.5 C (2.7 F).

Annual mean temperature at Grayson 3 SW as warming stripes, 1951 to 2000
Year	Annual mean temperature	Difference from the station mean
1951	12.4 C	+0.60 C
1952	12.8 C	+0.96 C
1954	13.3 C	+1.47 C
1956	13.1 C	+1.31 C
1957	13.3 C	+1.45 C
1970	11.8 C	+0.02 C
1971	11.8 C	-0.04 C
1972	11.5 C	-0.29 C
1973	12.6 C	+0.76 C
1974	12.0 C	+0.23 C
1978	10.8 C	-0.99 C
1979	10.8 C	-0.97 C
1980	11.1 C	-0.75 C
1981	10.9 C	-0.94 C
1982	11.9 C	+0.07 C
1983	11.8 C	+0.01 C
1984	11.8 C	+0.00 C
1986	11.8 C	-0.06 C
1987	11.6 C	-0.17 C
1988	11.0 C	-0.83 C
1989	10.8 C	-1.06 C
1990	12.6 C	+0.77 C
1991	12.6 C	+0.82 C
1992	11.2 C	-0.60 C
1993	11.3 C	-0.56 C
1994	11.3 C	-0.50 C
1995	11.3 C	-0.51 C
1996	10.7 C	-1.16 C
1997	11.2 C	-0.60 C
1998	13.2 C	+1.38 C
1999	12.1 C	+0.30 C
2000	11.7 C	-0.13 C

The annual mean temperature here has fallen by 0.3 C (0.1 to 0.5) per decade over 1951 to 2000. In Fahrenheit: 0.5 F (0.2 to 0.8) per decade. The slope is a straight line fitted to 32 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Grayson 3 SW
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	-0.3 C (-0.4 to -0.1) per decade	-0.5 F (-0.8 to -0.2) per decade	1951 to 2000	32	Fall
Mean daily maximum	-0.18 C (-0.39 to 0.03) per decade	-0.32 F (-0.70 to 0.05) per decade	1951 to 2000	32	Not clearly different from zero
Mean daily minimum	-0.4 C (-0.6 to -0.2) per decade	-0.7 F (-1.0 to -0.3) per decade	1951 to 2000	32	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

1925 to 2001

Yearly extremes at Grayson 3 SW: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.6 C (105.1 F)	1954	35.6 C (96.1 F)	42
Coldest night (TNn)	-35.0 C (-31.0 F)	1994	-20.3 C (-4.5 F)	42
Wettest day (Rx1day)	109.2 mm (4.3 in)	1997	60.6 mm (2.4 in)	60
Wettest five days (Rx5day)	174.5 mm (6.9 in)	1997	93.1 mm (3.7 in)	60
Longest dry spell (CDD)	37 days	1933	16 days	60

Hottest day (TXx)

The hottest day of the year at Grayson 3 SW, 1925 to 2001. The record is 40.6 C (105.1 F) in 1954, marked on the chart; the median year is 35.6 C (96.1 F).

Hottest day (TXx) at Grayson 3 SW by year
Year	Hottest day (TXx)
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
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1946	n/a
1948	n/a
1949	n/a
1950	29.4 C (84.9 F)
1951	36.7 C (98.1 F)
1952	39.4 C (102.9 F)
1953	39.4 C (102.9 F)
1954	40.6 C (105.1 F)
1955	36.1 C (97.0 F)
1956	35.6 C (96.1 F)
1957	37.2 C (99.0 F)
1958	33.9 C (93.0 F)
1969	35.0 C (95.0 F)
1970	38.3 C (100.9 F)
1971	35.0 C (95.0 F)
1972	34.4 C (93.9 F)
1973	36.1 C (97.0 F)
1974	32.2 C (90.0 F)
1975	34.4 C (93.9 F)
1976	33.3 C (91.9 F)
1977	35.0 C (95.0 F)
1978	35.0 C (95.0 F)
1979	34.4 C (93.9 F)
1980	38.3 C (100.9 F)
1981	33.9 C (93.0 F)
1982	33.3 C (91.9 F)
1983	38.3 C (100.9 F)
1984	35.6 C (96.1 F)
1985	32.8 C (91.0 F)
1986	34.4 C (93.9 F)
1987	36.7 C (98.1 F)
1988	40.0 C (104.0 F)
1989	33.9 C (93.0 F)
1990	35.6 C (96.1 F)
1991	36.1 C (97.0 F)
1992	33.3 C (91.9 F)
1993	35.0 C (95.0 F)
1994	36.1 C (97.0 F)
1995	36.1 C (97.0 F)
1996	33.9 C (93.0 F)
1997	35.6 C (96.1 F)
1998	36.7 C (98.1 F)
1999	39.4 C (102.9 F)
2000	33.9 C (93.0 F)
2001	35.6 C (96.1 F)

Coldest night (TNn)

The coldest night of the year at Grayson 3 SW, 1925 to 2001. The record is -35.0 C (-31.0 F) in 1994, marked on the chart; the median year is -20.3 C (-4.5 F).

Coldest night (TNn) at Grayson 3 SW by year
Year	Coldest night (TNn)
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
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1946	n/a
1948	n/a
1949	n/a
1950	-15.0 C (5.0 F)
1951	-21.1 C (-6.0 F)
1952	-16.7 C (1.9 F)
1953	-16.7 C (1.9 F)
1954	-23.3 C (-9.9 F)
1955	-16.1 C (3.0 F)
1956	-13.9 C (7.0 F)
1957	-21.7 C (-7.1 F)
1958	-20.6 C (-5.1 F)
1969	-14.4 C (6.1 F)
1970	-25.6 C (-14.1 F)
1971	-23.3 C (-9.9 F)
1972	-22.8 C (-9.0 F)
1973	-16.1 C (3.0 F)
1974	-11.1 C (12.0 F)
1975	-13.9 C (7.0 F)
1976	-16.7 C (1.9 F)
1977	-27.8 C (-18.0 F)
1978	-24.4 C (-11.9 F)
1979	-20.0 C (-4.0 F)
1980	-26.7 C (-16.1 F)
1981	-21.1 C (-6.0 F)
1982	-25.0 C (-13.0 F)
1983	-23.3 C (-9.9 F)
1984	-31.7 C (-25.1 F)
1985	-26.7 C (-16.1 F)
1986	-20.6 C (-5.1 F)
1987	-18.9 C (-2.0 F)
1988	-22.8 C (-9.0 F)
1989	-27.8 C (-18.0 F)
1990	-15.0 C (5.0 F)
1991	-16.7 C (1.9 F)
1992	-17.2 C (1.0 F)
1993	-22.2 C (-8.0 F)
1994	-35.0 C (-31.0 F)
1995	-19.4 C (-2.9 F)
1996	-30.0 C (-22.0 F)
1997	-17.8 C (0.0 F)
1998	-14.4 C (6.1 F)
1999	-18.3 C (-0.9 F)
2000	-17.8 C (0.0 F)
2001	-16.1 C (3.0 F)

Wettest day (Rx1day)

The wettest day of the year at Grayson 3 SW, 1925 to 2001. The record is 109.2 mm (4.3 in) in 1997, marked on the chart; the median year is 60.6 mm (2.4 in).

Wettest day (Rx1day) at Grayson 3 SW by year
Year	Wettest day (Rx1day)
1925	43.9 mm (1.7 in)
1926	95.8 mm (3.8 in)
1927	62.5 mm (2.5 in)
1928	70.1 mm (2.8 in)
1929	48.3 mm (1.9 in)
1930	29.2 mm (1.1 in)
1931	57.2 mm (2.3 in)
1932	51.6 mm (2.0 in)
1933	57.4 mm (2.3 in)
1938	24.9 mm (1.0 in)
1939	71.1 mm (2.8 in)
1940	49.8 mm (2.0 in)
1941	35.8 mm (1.4 in)
1942	55.9 mm (2.2 in)
1943	52.3 mm (2.1 in)
1946	34.0 mm (1.3 in)
1948	49.5 mm (1.9 in)
1949	60.2 mm (2.4 in)
1950	54.6 mm (2.1 in)
1951	76.2 mm (3.0 in)
1952	53.1 mm (2.1 in)
1953	34.0 mm (1.3 in)
1954	81.5 mm (3.2 in)
1955	46.2 mm (1.8 in)
1956	61.0 mm (2.4 in)
1957	65.5 mm (2.6 in)
1958	61.0 mm (2.4 in)
1969	62.0 mm (2.4 in)
1970	61.7 mm (2.4 in)
1971	40.9 mm (1.6 in)
1972	67.8 mm (2.7 in)
1973	67.3 mm (2.6 in)
1974	61.5 mm (2.4 in)
1975	55.6 mm (2.2 in)
1976	40.6 mm (1.6 in)
1977	59.4 mm (2.3 in)
1978	89.7 mm (3.5 in)
1979	53.3 mm (2.1 in)
1980	75.4 mm (3.0 in)
1981	69.9 mm (2.8 in)
1982	62.0 mm (2.4 in)
1983	51.8 mm (2.0 in)
1984	48.5 mm (1.9 in)
1985	74.9 mm (2.9 in)
1986	69.9 mm (2.8 in)
1987	91.4 mm (3.6 in)
1988	102.1 mm (4.0 in)
1989	63.5 mm (2.5 in)
1990	57.7 mm (2.3 in)
1991	79.0 mm (3.1 in)
1992	71.4 mm (2.8 in)
1993	74.4 mm (2.9 in)
1994	49.0 mm (1.9 in)
1995	71.9 mm (2.8 in)
1996	52.8 mm (2.1 in)
1997	109.2 mm (4.3 in)
1998	44.2 mm (1.7 in)
1999	81.3 mm (3.2 in)
2000	63.8 mm (2.5 in)
2001	58.2 mm (2.3 in)

Wettest five days (Rx5day)

The wettest five days of the year at Grayson 3 SW, 1925 to 2001. The record is 174.5 mm (6.9 in) in 1997, marked on the chart; the median year is 93.1 mm (3.7 in).

Wettest five days (Rx5day) at Grayson 3 SW by year
Year	Wettest five days (Rx5day)
1925	74.8 mm (2.9 in)
1926	97.6 mm (3.8 in)
1927	93.0 mm (3.7 in)
1928	102.3 mm (4.0 in)
1929	115.1 mm (4.5 in)
1930	42.9 mm (1.7 in)
1931	86.4 mm (3.4 in)
1932	101.8 mm (4.0 in)
1933	85.6 mm (3.4 in)
1938	42.1 mm (1.7 in)
1939	97.8 mm (3.9 in)
1940	63.5 mm (2.5 in)
1941	81.7 mm (3.2 in)
1942	91.6 mm (3.6 in)
1943	90.7 mm (3.6 in)
1946	47.7 mm (1.9 in)
1948	84.3 mm (3.3 in)
1949	89.7 mm (3.5 in)
1950	128.1 mm (5.0 in)
1951	110.5 mm (4.4 in)
1952	105.1 mm (4.1 in)
1953	54.4 mm (2.1 in)
1954	113.3 mm (4.5 in)
1955	68.4 mm (2.7 in)
1956	128.5 mm (5.1 in)
1957	88.7 mm (3.5 in)
1958	117.4 mm (4.6 in)
1969	70.2 mm (2.8 in)
1970	70.2 mm (2.8 in)
1971	75.5 mm (3.0 in)
1972	95.9 mm (3.8 in)
1973	93.8 mm (3.7 in)
1974	149.4 mm (5.9 in)
1975	114.9 mm (4.5 in)
1976	55.9 mm (2.2 in)
1977	71.9 mm (2.8 in)
1978	137.9 mm (5.4 in)
1979	102.9 mm (4.1 in)
1980	93.2 mm (3.7 in)
1981	100.8 mm (4.0 in)
1982	88.1 mm (3.5 in)
1983	128.6 mm (5.1 in)
1984	76.7 mm (3.0 in)
1985	97.5 mm (3.8 in)
1986	119.6 mm (4.7 in)
1987	95.7 mm (3.8 in)
1988	171.5 mm (6.8 in)
1989	143.3 mm (5.6 in)
1990	91.4 mm (3.6 in)
1991	109.0 mm (4.3 in)
1992	92.7 mm (3.6 in)
1993	77.2 mm (3.0 in)
1994	94.8 mm (3.7 in)
1995	89.6 mm (3.5 in)
1996	92.2 mm (3.6 in)
1997	174.5 mm (6.9 in)
1998	116.8 mm (4.6 in)
1999	86.4 mm (3.4 in)
2000	86.1 mm (3.4 in)
2001	135.1 mm (5.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at Grayson 3 SW, 1925 to 2001. The record is 37 days in 1933, marked on the chart; the median year is 16 days.

Longest dry spell (CDD) at Grayson 3 SW by year
Year	Longest dry spell (CDD)
1925	19 days
1926	9 days
1927	20 days
1928	18 days
1929	12 days
1930	18 days
1931	26 days
1932	31 days
1933	37 days
1938	13 days
1939	16 days
1940	34 days
1941	15 days
1942	23 days
1943	17 days
1946	23 days
1948	15 days
1949	12 days
1950	16 days
1951	16 days
1952	30 days
1953	36 days
1954	14 days
1955	29 days
1956	16 days
1957	25 days
1958	12 days
1969	16 days
1970	13 days
1971	12 days
1972	12 days
1973	15 days
1974	13 days
1975	13 days
1976	27 days
1977	22 days
1978	11 days
1979	14 days
1980	14 days
1981	23 days
1982	13 days
1983	13 days
1984	13 days
1985	16 days
1986	25 days
1987	19 days
1988	22 days
1989	12 days
1990	12 days
1991	13 days
1992	17 days
1993	17 days
1994	22 days
1995	31 days
1996	14 days
1997	14 days
1998	23 days
1999	18 days
2000	15 days
2001	14 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

32 years with a frost

Across 32 years with a frost, the median last spring frost at Grayson 3 SW falls on 4 May and the median first autumn frost on 7 October, which leaves a median of 155 days between them.

Fitted over all years, the growing season changes by +0.6 days per decade at this station.

Frost dates and growing season at Grayson 3 SW
Measure	Median, all years	Earliest period	Recent period (1954 to 2000)	Recent against earliest	Fitted trend
Last spring frost	4 May	n/a	4 May	n/a	-1.0 days per decade
First autumn frost	7 October	n/a	8 October	n/a	-0.4 days per decade
Growing days	155 days	n/a	155 days	n/a	+0.6 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

50 years, 1926 to 2000

A day with at least 61.4 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 110.3 mm (4.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Grayson 3 SW: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	61.4 mm (2.4 in)
5 years	76.3 mm (3.0 in)
10 years	85.4 mm (3.4 in)
25 years	96.1 mm (3.8 in)
50 years	103.4 mm (4.1 in)
100 years	110.3 mm (4.3 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 1926 to 2000.

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: 109.2 mm (4.3 in) in 1997; 102.1 mm (4.0 in) in 1988; 95.8 mm (3.8 in) in 1926.

Download the Data

Data for Grayson 3 SW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Grayson 3 SW 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).