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Built 2026-10-19 (19 October 2026)

Stony Mountain Threshold Days by Year (CA005022790)

17 fixed thresholds counted per year at Stony Mountain (CA005022790): 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 31 years, most in 1910 with 35.
  • Stony Mountain: days with a maximum temperature at or below 0 C (32 F) in 31 years, most in 1880 with 134.
  • Stony Mountain: nights with a minimum temperature at or below 0 C (32 F) in 31 years, most in 1885 with 230.
  • Stony Mountain: nights with a minimum temperature at or below -10 C (14 F) in 31 years, most in 1887 with 147.
  • 17 fixed thresholds have at least one qualifying day at Stony Mountain.
31 years with a qualifying day
Days at or above 30 C (86 F) per year at Stony Mountain 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 1910. 0102030401878: 131879: 71880: 51882: 61884: 141885: 31886: 151887: 91888: 121889: 211890: 311891: 21895: 21896: 11897: 101898: 71899: 21900: 181901: 111902: 41903: 31905: 31908: 231909: 71910: 351911: 31912: 111913: 191915: 271917: 241918: 1218781884188818951899190319101915
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 1910.
Days at or above 30 C (86 F) per year at Stony Mountain
YearDaysDecade average
18781310
1879710
1880510.6
1882610.6
18841410.6
1885310.6
18861510.6
1887910.6
18881210.6
18892110.6
1890317.9
189127.9
189527.9
189617.9
1897107.9
189877.9
189927.9
1900189.9
1901119.9
190249.9
190339.9
190539.9
1908239.9
190979.9
19103518.7
1911318.7
19121118.7
19131918.7
19152718.7
19172418.7
19181218.7
First to last qualifying date each year at Stony Mountain For each year, a bar from the first to the last day at Stony Mountain meeting 30 C (86 F). 1878: 24 June 1878 to 30 August 18781879: 10 July 1879 to 6 October 18791880: 23 July 1880 to 31 July 18801882: 4 August 1882 to 16 September 18821884: 14 June 1884 to 27 August 18841885: 3 July 1885 to 29 July 18851886: 29 June 1886 to 25 August 18861887: 7 May 1887 to 19 September 18871888: 13 June 1888 to 2 September 18881889: 5 June 1889 to 1 September 18891890: 8 June 1890 to 6 August 18901891: 7 May 1891 to 5 August 18911895: 13 August 1895 to 15 August 18951896: 1 July 1896 to 1 July 18961897: 4 May 1897 to 23 September 18971898: 12 July 1898 to 21 August 18981899: 22 July 1899 to 23 July 18991900: 13 May 1900 to 20 August 19001901: 17 May 1901 to 4 September 19011902: 23 July 1902 to 28 August 19021903: 8 July 1903 to 24 July 19031905: 11 July 1905 to 30 September 19051908: 26 June 1908 to 17 September 19081909: 20 June 1909 to 27 August 19091910: 28 May 1910 to 21 August 19101911: 13 August 1911 to 15 August 19111912: 22 June 1912 to 3 July 19121913: 27 May 1913 to 15 August 19131915: 3 June 1915 to 7 September 19151917: 15 May 1917 to 22 August 19171918: 5 May 1918 to 25 August 191818781884188818951899190319101915JanFebMarAprMayJunJulAugSepOctNovDec
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
YearFirst dateLast date
18781878-06-241878-08-30
18791879-07-101879-10-06
18801880-07-231880-07-31
18821882-08-041882-09-16
18841884-06-141884-08-27
18851885-07-031885-07-29
18861886-06-291886-08-25
18871887-05-071887-09-19
18881888-06-131888-09-02
18891889-06-051889-09-01
18901890-06-081890-08-06
18911891-05-071891-08-05
18951895-08-131895-08-15
18961896-07-011896-07-01
18971897-05-041897-09-23
18981898-07-121898-08-21
18991899-07-221899-07-23
19001900-05-131900-08-20
19011901-05-171901-09-04
19021902-07-231902-08-28
19031903-07-081903-07-24
19051905-07-111905-09-30
19081908-06-261908-09-17
19091909-06-201909-08-27
19101910-05-281910-08-21
19111911-08-131911-08-15
19121912-06-221912-07-03
19131913-05-271913-08-15
19151915-06-031915-09-07
19171917-05-151917-08-22
19181918-05-051918-08-25

Every Fixed Threshold

Fixed thresholds at Stony Mountain
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3135191012
35 C (95 F): Days12918901
40 C (104 F): Days2118861
90 F (32.2 C): Days241918904
100 F (37.8 C): Days5318901
0 C (32 F): Ice days (max31134188087
0 C (32 F): Frost days (min312301885197
-10 C (14 F): Days with min311471887116
-20 C (-4 F): Days with min3199188763
-30 C (-22 F): Days with min3153188419
-40 C (-40 F): Days with min19918852
20 C (68 F): Tropical nights (min15618842
10 mm (0.39 in): Days with 10 mm or more rain212218799
25 mm (0.98 in): Days with 25 mm or more rain17719133
50 mm (1.97 in): Days with 50 mm or more rain5218901
10 cm (3.9 in): Days with 10 cm or more snowfall21419051
25 cm (9.8 in): Days with 25 cm or more snowfall5118841

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1878.

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 . Last revised (2026-10-17).