McKinney, TX All-Time Weather Extremes
The most extreme temperature, precipitation, and snowfall ever recorded in McKinney, from NOAA daily weather observations.
| Temperature | ||
|---|---|---|
| Record High | 109°F (43°C) | July 12, 1998 and September 4, 1998 and September 5, 2000 |
| Record Low | -4°F (-20°C) | December 23, 1989 |
| Lowest High | 15°F (-9°C) | December 22, 1990 |
| Highest Low | 84.9°F (29°C) | August 21, 1997 and September 16, 1997 |
| Highest Mean | 94.5°F (35°C) | July 12, 1998 and July 19, 2006 |
| Lowest Mean | 8.5°F (-13°C) | December 23, 1989 |
| Precipitation | ||
| Max in One Calendar Day | 7.75" (196.9 mm) | May 13, 1982 |
| Max in One Month | 16.70" (424.2 mm) | May 1982 |
| Least in One Month | 0.00" (0.0 mm) | July 1993 |
| Max in One Year | 51.33" (1303.7 mm) | 1994 |
| Least in One Year | 23.42" (594.9 mm) | 1972 |
| Snowfall | ||
| Max in One Calendar Day | 4.2" (10.7 cm) | February 18, 1978 and December 16, 1983 |
| Max in One Month | 12.1" (30.8 cm) | February 1978 |
| Max in One Season | 17.4" (44.2 cm) | 1977-78 |
| Max in One Year | 17.9" (45.5 cm) | 1978 |
| Earliest Snow | 1.0" (2.5 cm) | November 13, 1976 |
| Earliest Measurable Snow | 1.0" (2.5 cm) | November 13, 1976 |
| Latest Snow | 1.0" (2.5 cm) | March 29, 1987 |
| Latest Measurable Snow | 1.0" (2.5 cm) | March 29, 1987 |
| Period of Record | ||
| Temperature | January 1, 1970 – August 1, 2026 | |
| Precipitation | January 1, 1970 – August 1, 2026 | |
| Snowfall | January 1, 1970 – November 20, 2024 | |
Note: Records compiled from NOAA GHCN-Daily observations at MCKINNEY MUNI AP (1 mi from McKinney, TX). Quality-flagged readings are excluded. Monthly and annual totals require substantially complete reporting for “least” records.
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Frequently Asked Questions
What is the hottest temperature ever recorded in McKinney, TX?
The all-time record high in McKinney, TX is 109°F (43°C), set on July 12, 1998 and September 4, 1998 and September 5, 2000.
What is the coldest temperature ever recorded in McKinney, TX?
The all-time record low in McKinney, TX is -4°F (-20°C), set on December 23, 1989.
What is the most rain McKinney, TX has ever had in one day?
The most precipitation recorded in one calendar day near McKinney, TX is 7.75 inches, on May 13, 1982.
What is the biggest snowfall ever recorded in McKinney, TX?
The most snow recorded in one calendar day near McKinney, TX is 4.2 inches, on February 18, 1978 and December 16, 1983.
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McKinney Weather History
Monthly averages, records, and climate data for McKinney
Texas Weather Extremes
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