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Data as of 2026-10-17
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Built 2026-10-19 (19 October 2026)

Altawan Threshold Days by Year (CA003040223)

17 fixed thresholds counted per year at Altawan (CA003040223): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Altawan Thresholds

  • Altawan: days with 10 mm (0.39 in) or more of precipitation in 12 years, most in 1975 with 18.
  • Altawan: nights with a minimum temperature at or below 0 C (32 F) in 11 years, most in 1970 with 240.
  • Altawan: nights with a minimum temperature at or below -10 C (14 F) in 11 years, most in 1970 with 141.
  • Altawan: nights with a minimum temperature at or below -20 C (-4 F) in 11 years, most in 1978 with 87.
  • 17 fixed thresholds have at least one qualifying day at Altawan.
9 years with a qualifying day
Days at or above 30 C (86 F) per year at Altawan Days per year at Altawan with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 59 in 1969. 02040601966: 311969: 591970: 481972: 431973: 571974: 421975: 261978: 271979: 20196619691970197219731974197519781979
Days per year at Altawan with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 59 in 1969.
Days at or above 30 C (86 F) per year at Altawan
YearDaysDecade average
19663145
19695945
19704837.6
19724337.6
19735737.6
19744237.6
19752637.6
19782737.6
19792037.6
First to last qualifying date each year at Altawan For each year, a bar from the first to the last day at Altawan meeting 30 C (86 F). 1966: 26 May 1966 to 18 September 19661969: 24 May 1969 to 12 September 19691970: 15 May 1970 to 5 September 19701972: 31 May 1972 to 31 August 19721973: 13 June 1973 to 21 August 19731974: 10 June 1974 to 7 August 19741975: 3 July 1975 to 28 July 19751978: 29 June 1978 to 6 September 19781979: 28 June 1979 to 2 September 197919661970197319751979JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Altawan meeting 30 C (86 F).
First to last qualifying date each year at Altawan
YearFirst dateLast date
19661966-05-261966-09-18
19691969-05-241969-09-12
19701970-05-151970-09-05
19721972-05-311972-08-31
19731973-06-131973-08-21
19741974-06-101974-08-07
19751975-07-031975-07-28
19781978-06-291978-09-06
19791979-06-281979-09-02

Every Fixed Threshold

Fixed thresholds at Altawan
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days959196920
35 C (95 F): Days92219731
40 C (104 F): Days4219692
90 F (32.2 C): Days95019736
100 F (37.8 C): Days61019731
0 C (32 F): Ice days (max9123197888
0 C (32 F): Frost days (min112401970221
-10 C (14 F): Days with min111411970150
-20 C (-4 F): Days with min1187197884
-30 C (-22 F): Days with min1130197932
-40 C (-40 F): Days with min5719692
20 C (68 F): Tropical nights (min51219732
10 mm (0.39 in): Days with 10 mm or more rain121819758
25 mm (0.98 in): Days with 25 mm or more rain8419781
50 mm (1.97 in): Days with 50 mm or more rain2119701
10 cm (3.9 in): Days with 10 cm or more snowfall111219753
25 cm (9.8 in): Days with 25 cm or more snowfall3119751

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1966.

Download the Data

  • Data for Altawan 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).