The highest temperature Phoenix has endured was 122 degrees back on June 6th, 1990. Even more amazing may be the fact that our hottest overnight low was 96 degrees on July 15th, 2003.
Phoenix’s longest streak of 110 degrees or above was 18 days in, ending on June 29th, 1974. We saw 76 days in a row of 100 degrees or higher back on August 24th, 1993. An astounding 115 days in a row with temperatures above 95 degrees on September 21st, 1981 and 154 days with our daytime highs reaching 90+ degrees on October 7th, 1983.
The earliest Phoenix ever hit 110 was on May 8th, 1989 and the earliest we ever hit 100 was the same year of April 6th, 1989.
| Phoenix | Tucson | Flagstaff |
| Highest Maximum: | 122 | 117 | 97 |
| Date: | June 26th, 1990 | June 26th, 1990 | July 5th, 1973 |
| Highest Minimum: | 96 | 89 | 68 |
| Date: | July 15th, 2003 | July 22nd, 2006 | July 2nd, 2002 |
| Consecutive Days of <=110 | 18 Days | 6 Days | 0 Days |
| Ending Date: | June 29th, 1974 | June 29th, 1974 | * |
| Consecutive Days of <=100 | 76 Days | 39 Days | 0 Days |
| Ending Date: | Aug. 24th, 1993 | July 22nd, 2005 | * |
| Consecutive Days of <=95 | 115 Days | 63 Days | 2 Days |
| Ending Date: | Sept. 21st, 1981 | Sept. 17, 1924 | June 26th, 1970 |
| Consecutive Days of <=90 | 154 Days | 126 Days | 11 Days |
| Ending Date: | Oct. 7th, 1983 | Oct. 4th, 1924 | July 1st, 1990 |
| Earliest 110 | May 8th, 1989 | May 29th, 1910 | * |
| Earliest 100 | March 26th, 1988 | April 19th, 1989 | * |
* Flagstaff has never officially reached 100 degrees
