Stony Mountain Threshold Days by Year (CA005022791)

15 fixed thresholds counted per year at Stony Mountain (CA005022791): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Stony Mountain Thresholds

Stony Mountain: days with a maximum temperature at or above 30 C (86 F) in 11 years, most in 1983 with 35.
Stony Mountain: days with a maximum temperature at or above 90 F (32.2 C) in 11 years, most in 1980 with 14.
Stony Mountain: days with a maximum temperature at or below 0 C (32 F) in 11 years, most in 1979 with 138.
Stony Mountain: nights with a minimum temperature at or below 0 C (32 F) in 11 years, most in 1974 with 210.
15 fixed thresholds have at least one qualifying day at Stony Mountain.

Days at or above 30 C (86 F)

11 years with a qualifying day

Days per year at Stony Mountain with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 35 in 1983.

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

First to last qualifying date each year at Stony Mountain
Year	First date	Last date
1972	1972-05-16	1972-08-30
1973	1973-06-02	1973-08-31
1974	1974-06-19	1974-08-07
1975	1975-06-20	1975-07-30
1976	1976-06-01	1976-09-06
1977	1977-05-10	1977-07-22
1978	1978-06-05	1978-09-10
1979	1979-06-13	1979-09-16
1980	1980-04-20	1980-09-07
1981	1981-05-21	1981-07-19
1983	1983-06-10	1983-09-02

Every Fixed Threshold

Fixed thresholds at Stony Mountain
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	11	35	1983	35
35 C (95 F): Days	7	3	1975	3
90 F (32.2 C): Days	11	14	1980	13
100 F (37.8 C): Days	2	1	1980	1
0 C (32 F): Ice days (max	11	138	1979	88
0 C (32 F): Frost days (min	11	210	1974	172
-10 C (14 F): Days with min	11	131	1978	74
-20 C (-4 F): Days with min	11	87	1978	31
-30 C (-22 F): Days with min	11	32	1972	8
-40 C (-40 F): Days with min	1	3	1974	3
20 C (68 F): Tropical nights (min	7	7	1983	7
10 mm (0.39 in): Days with 10 mm or more rain	11	20	1977	12
25 mm (0.98 in): Days with 25 mm or more rain	11	5	1977	2
50 mm (1.97 in): Days with 50 mm or more rain	2	1	1976	1
10 cm (3.9 in): Days with 10 cm or more snowfall	9	3	1978	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1972.

Download the Data

Data for Stony Mountain 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).

Stony Mountain Threshold Days by Year (CA005022791)

Key Facts for Stony Mountain Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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