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| Phoenix
| Yuma
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| Average First 100 °F Day
| May 13 (All-time) May 2 (1981-2010)
| Apr 30 (All-time) Apr 23 (1981-2010)
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| Earliest First 100 °F Day
| 26 Mar 1988
| 12 Mar 1916
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| Latest First 100 °F Day
| 18 Jun 1913
| 13 Jun 1971
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| Average Last 100 °F Day
| Sep 29 (All-time) Oct 3 (1981-2010)
| Oct 5 (All-time) Oct 7 (1981-2010)
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| Earliest Last 100 °F Day
| 2 Sep 1904
| 5 Sep 1976
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| Latest Last 100 °F Day
| 23 Oct 2003
| 25 Oct 1959
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| Average number of 100 °F+ days per year
| 92 (All-time) 109 (1981-2010)
| 109 (All-time) 118 (1979-2008)
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| Fewest number of 100 °F+ days
| 48 (1913)
| 80 (1884)
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| Greatest number of 100 °F+ days
| 143 (1989)
| 144 (1952)
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| Longest stretch of 100 °F+ days
| 76 (10 Jun 1993 - 24 Aug 1993)
| 99 (31 May 2006 - 6 Sep 2006)
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| Average First 110 °F Day
| 19 Jun (All-time) 10 Jun (1981-2010)
| 15 Jun (All-time) 10 Jun (1981-2010)
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| Earliest First 110 °F Day
| 8 May 1989
| 2 May 1947
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| Latest First 110 °F Day
| 1911 No 110 °F Day
| 22 Jul 1921
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| Average Last 110 °F Day
| 11 Aug (All-time) 27 Aug (1981-2010)
| 1 Sep (All-time) 7 Sep (1981-2010)
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| Earliest Last 110 °F Day
| 5 Jun 1912
| 11 Jul 1904
|
| Latest Last 110 °F Day
| 19 Sep 2010
| 2 Oct 1980
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| Average number of 110 °F+ days per year
| 11 (All-time) 18 (1981-2010)
| 19 (All-time) 26 (1981-2010)
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| Fewest number of 110 °F+ days
| None (1911)
| 1 (1904)
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| Greatest number of 110 °F+ days
| 33 (2011)
| 53 (1994)
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| Longest stretch of 110 °F+ days
| 18 (12 Jun 1974 - 29 Jun 1974)
| 18 (24 Jul 1995 - 10 Aug 1995)
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| Top 5 Hottest Days
| 1. 122 (26 Jun 1990)
2. 121 (28 Jul 1995)
3. 120 (25 Jun 1990)
4. 118 (21 Jul 2006 and 7 other times)
| 1. 124 (28 Jul 1995)
2. 123 (1 Sep 1950)
3. 122 (26 Jun 1990)
4. 120 (27 Aug 1981 and 3 other times)
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