Grayson 3 SW Threshold Days by Year (USC00153391)

17 fixed thresholds counted per year at Grayson 3 SW (USC00153391): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Grayson 3 SW Thresholds

Grayson 3 SW: days with 10 mm (0.39 in) or more of precipitation in 50 years, most in 1956 with 52.
Grayson 3 SW: days with 25 mm (0.98 in) or more of precipitation in 50 years, most in 1956 with 16.
Grayson 3 SW: days with 50 mm (1.97 in) or more of precipitation in 40 years, most in 1939 with 4.
Grayson 3 SW: days with a maximum temperature at or above 30 C (86 F) in 34 years, most in 1954 with 96.
17 fixed thresholds have at least one qualifying day at Grayson 3 SW.

Days at or above 30 C (86 F)

34 years with a qualifying day

Days per year at Grayson 3 SW with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 96 in 1954.

Days at or above 30 C (86 F) per year at Grayson 3 SW
Year	Days	Decade average
1951	80	80.5
1952	81	80.5
1954	96	80.5
1955	80	80.5
1956	68	80.5
1957	78	80.5
1970	80	54.6
1971	53	54.6
1972	40	54.6
1973	62	54.6
1974	39	54.6
1977	67	54.6
1978	61	54.6
1979	35	54.6
1980	75	60.2
1981	50	60.2
1982	46	60.2
1983	79	60.2
1984	63	60.2
1986	47	60.2
1987	71	60.2
1988	69	60.2
1989	42	60.2
1990	50	63.5
1991	85	63.5
1992	33	63.5
1993	62	63.5
1994	61	63.5
1995	71	63.5
1996	55	63.5
1997	46	63.5
1998	91	63.5
1999	81	63.5
2000	57	57

For each year, a bar from the first to the last day at Grayson 3 SW meeting 30 C (86 F).

First to last qualifying date each year at Grayson 3 SW
Year	First date	Last date
1951	1951-04-28	1951-10-18
1952	1952-04-20	1952-10-01
1954	1954-04-07	1954-10-14
1955	1955-04-18	1955-09-29
1956	1956-04-27	1956-09-14
1957	1957-04-19	1957-09-21
1970	1970-04-30	1970-09-27
1971	1971-05-18	1971-10-01
1972	1972-05-26	1972-09-19
1973	1973-04-22	1973-09-29
1974	1974-04-02	1974-08-28
1977	1977-04-19	1977-09-19
1978	1978-05-20	1978-09-22
1979	1979-05-08	1979-09-13
1980	1980-05-14	1980-09-22
1981	1981-04-14	1981-10-01
1982	1982-05-07	1982-11-03
1983	1983-06-11	1983-09-21
1984	1984-04-27	1984-09-23
1986	1986-04-08	1986-10-01
1987	1987-04-22	1987-09-18
1988	1988-04-06	1988-09-24
1989	1989-04-26	1989-09-22
1990	1990-04-25	1990-09-08
1991	1991-05-12	1991-10-05
1992	1992-05-17	1992-09-22
1993	1993-05-09	1993-09-15
1994	1994-05-24	1994-09-17
1995	1995-05-25	1995-09-15
1996	1996-05-10	1996-09-08
1997	1997-05-19	1997-10-14
1998	1998-03-31	1998-10-07
1999	1999-04-23	1999-09-29
2000	2000-05-07	2000-10-05

Every Fixed Threshold

Fixed thresholds at Grayson 3 SW
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	34	96	1954	57
35 C (95 F): Days	24	22	1954	21
40 C (104 F): Days	2	1	1954	1
90 F (32.2 C): Days	34	56	1952	18
100 F (37.8 C): Days	7	9	1988	2
0 C (32 F): Ice days (max	34	37	1977	21
0 C (32 F): Frost days (min	34	168	1988	142
-10 C (14 F): Days with min	34	48	1978	30
-20 C (-4 F): Days with min	20	12	1977	3
-30 C (-22 F): Days with min	3	2	1984	2
20 C (68 F): Tropical nights (min	34	30	1955	1
10 mm (0.39 in): Days with 10 mm or more rain	50	52	1956	36
25 mm (0.98 in): Days with 25 mm or more rain	50	16	1956	12
50 mm (1.97 in): Days with 50 mm or more rain	40	4	1939	2
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1988	1
10 cm (3.9 in): Days with 10 cm or more snowfall	16	3	1979	2
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1993	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1951.

Download the Data

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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Grayson 3 SW Threshold Days by Year (USC00153391)

Key Facts for Grayson 3 SW Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related