Shelby Threshold Days by Year (USC00247500)

16 fixed thresholds counted per year at Shelby (USC00247500): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Shelby Thresholds

Shelby: days with 10 mm (0.39 in) or more of precipitation in 37 years, most in 1953 with 14.
Shelby: nights with a minimum temperature at or below 0 C (32 F) in 35 years, most in 1955 with 208.
Shelby: nights with a minimum temperature at or below -10 C (14 F) in 35 years, most in 1955 with 113.
Shelby: nights with a minimum temperature at or below -20 C (-4 F) in 35 years, most in 1955 with 48.
16 fixed thresholds have at least one qualifying day at Shelby.

Days at or above 30 C (86 F)

26 years with a qualifying day

Days per year at Shelby with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 53 in 2017.

Days at or above 30 C (86 F) per year at Shelby
Year	Days	Decade average
1951	22	29
1952	32	29
1953	27	29
1954	28	29
1955	36	29
1997	32	36.7
1998	48	36.7
1999	30	36.7
2009	24	24
2010	12	33.9
2011	37	33.9
2012	33	33.9
2013	35	33.9
2014	32	33.9
2015	44	33.9
2016	33	33.9
2017	53	33.9
2018	39	33.9
2019	21	33.9
2020	29	34
2021	43	34
2022	47	34
2023	32	34
2024	30	34
2025	25	34
2026	32	34

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

First to last qualifying date each year at Shelby
Year	First date	Last date
1951	1951-05-22	1951-08-21
1952	1952-04-30	1952-09-27
1953	1953-05-06	1953-09-13
1954	1954-05-19	1954-08-31
1955	1955-07-14	1955-09-07
1997	1997-07-13	1997-09-25
1998	1998-05-26	1998-09-16
1999	1999-05-24	1999-09-21
2009	2009-06-29	2009-09-24
2010	2010-06-29	2010-08-27
2011	2011-06-29	2011-10-01
2012	2012-05-16	2012-09-01
2013	2013-06-30	2013-09-17
2014	2014-07-03	2014-09-26
2015	2015-06-08	2015-09-26
2016	2016-05-04	2016-09-02
2017	2017-05-06	2017-09-12
2018	2018-05-17	2018-09-08
2019	2019-06-03	2019-09-16
2020	2020-06-13	2020-09-12
2021	2021-06-03	2021-09-10
2022	2022-06-28	2022-09-29
2023	2023-05-22	2023-09-17
2024	2024-06-24	2024-09-26
2025	2025-05-29	2025-09-26
2026	2026-05-26	2026-09-26

Every Fixed Threshold

Fixed thresholds at Shelby
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	26	53	2017	32
35 C (95 F): Days	24	10	2015	5
90 F (32.2 C): Days	26	31	2017	17
100 F (37.8 C): Days	5	3	2018	2
0 C (32 F): Ice days (max	26	79	1951	22
0 C (32 F): Frost days (min	35	208	1955	103
-10 C (14 F): Days with min	35	113	1955	19
-20 C (-4 F): Days with min	35	48	1955	9
-30 C (-22 F): Days with min	29	17	1951	5
-40 C (-40 F): Days with min	2	3	1997	3
20 C (68 F): Tropical nights (min	8	4	2022	2
10 mm (0.39 in): Days with 10 mm or more rain	37	14	1953	12
25 mm (0.98 in): Days with 25 mm or more rain	23	4	1953	5
50 mm (1.97 in): Days with 50 mm or more rain	3	1	2018	1
10 cm (3.9 in): Days with 10 cm or more snowfall	18	4	2009	1
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	2009	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 Shelby 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Shelby Threshold Days by Year (USC00247500)

Key Facts for Shelby Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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