Shelby AP Threshold Days by Year (USC00247501)

15 fixed thresholds counted per year at Shelby AP (USC00247501): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Shelby AP Thresholds

Shelby AP: nights with a minimum temperature at or below 0 C (32 F) in 29 years, most in 1970 with 218.
Shelby AP: nights with a minimum temperature at or below -10 C (14 F) in 29 years, most in 1978 with 103.
Shelby AP: nights with a minimum temperature at or below -20 C (-4 F) in 29 years, most in 1969 with 45.
Shelby AP: days with 10 mm (0.39 in) or more of precipitation in 29 years, most in 1981 with 13.
15 fixed thresholds have at least one qualifying day at Shelby AP.

Days at or above 30 C (86 F)

28 years with a qualifying day

Days per year at Shelby AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 54 in 1961.

Days at or above 30 C (86 F) per year at Shelby AP
Year	Days	Decade average
1959	29	29
1960	41	31.6
1961	54	31.6
1962	19	31.6
1963	36	31.6
1964	21	31.6
1965	19	31.6
1966	25	31.6
1967	42	31.6
1968	20	31.6
1969	39	31.6
1970	43	31
1971	42	31
1972	26	31
1973	38	31
1974	38	31
1975	18	31
1976	26	31
1977	23	31
1978	19	31
1979	37	31
1980	17	33.1
1981	37	33.1
1983	35	33.1
1984	48	33.1
1985	34	33.1
1986	34	33.1
1987	27	33.1

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

First to last qualifying date each year at Shelby AP
Year	First date	Last date
1959	1959-06-12	1959-09-14
1960	1960-05-12	1960-09-04
1961	1961-06-04	1961-08-30
1962	1962-06-24	1962-08-25
1963	1963-06-18	1963-10-02
1964	1964-05-19	1964-08-18
1965	1965-06-10	1965-08-12
1966	1966-05-26	1966-09-21
1967	1967-07-12	1967-09-29
1968	1968-06-26	1968-09-11
1969	1969-05-24	1969-09-12
1970	1970-06-02	1970-09-29
1971	1971-06-22	1971-10-09
1972	1972-05-30	1972-08-30
1973	1973-05-15	1973-08-22
1974	1974-06-12	1974-09-25
1975	1975-07-04	1975-08-07
1976	1976-06-30	1976-09-06
1977	1977-06-01	1977-08-19
1978	1978-06-28	1978-09-05
1979	1979-06-12	1979-09-16
1980	1980-05-21	1980-09-07
1981	1981-06-26	1981-09-19
1983	1983-07-05	1983-09-02
1984	1984-05-29	1984-09-18
1985	1985-05-22	1985-08-25
1986	1986-05-27	1986-08-30
1987	1987-04-28	1987-09-23

Every Fixed Threshold

Fixed thresholds at Shelby AP
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	28	54	1961	27
35 C (95 F): Days	20	15	1971	2
40 C (104 F): Days	2	1	1961	1
90 F (32.2 C): Days	28	34	1971	10
100 F (37.8 C): Days	6	3	1960	1
0 C (32 F): Ice days (max	28	90	1978	26
0 C (32 F): Frost days (min	29	218	1970	162
-10 C (14 F): Days with min	29	103	1978	52
-20 C (-4 F): Days with min	29	45	1969	7
-30 C (-22 F): Days with min	27	11	1969	2
-40 C (-40 F): Days with min	2	1	1968	1
20 C (68 F): Tropical nights (min	5	2	1985	2
10 mm (0.39 in): Days with 10 mm or more rain	29	13	1981	10
25 mm (0.98 in): Days with 25 mm or more rain	17	4	1964	1
50 mm (1.97 in): Days with 50 mm or more rain	4	1	1964	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1959.

Download the Data

Data for Shelby AP 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).

Shelby AP Threshold Days by Year (USC00247501)

Key Facts for Shelby AP Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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