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 | 118°F (48°C) | August 10, 1936 |
| Record Low | -7°F (-22°C) | January 18, 1930 |
| Lowest High | 8°F (-13°C) | February 13, 1905 |
| Highest Low | 87.9°F (31°C) | August 7, 1942 |
| Highest Mean | 97.0°F (36°C) | August 11, 1964 |
| Lowest Mean | 4.5°F (-15°C) | February 13, 1905 |
| Precipitation | ||
| Max in One Calendar Day | 12.10" (307.3 mm) | September 21, 1964 |
| Max in One Month | 21.56" (547.7 mm) | September 1964 |
| Least in One Month | 0.00" (0.0 mm) | October 1924 |
| Max in One Year | 57.68" (1465.0 mm) | 1990 |
| Least in One Year | 20.76" (527.3 mm) | 1925 |
| Snowfall | ||
| Max in One Calendar Day | 7.0" (17.8 cm) | January 16, 1964 |
| 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 | 0.5" (1.3 cm) | November 2, 1951 |
| Earliest Measurable Snow | 0.5" (1.3 cm) | November 2, 1951 |
| Latest Snow | 2.0" (5.1 cm) | March 30, 1926 |
| Latest Measurable Snow | 2.0" (5.1 cm) | March 30, 1926 |
| Period of Record | ||
| Temperature | April 3, 1903 – August 2, 2026 | |
| Precipitation | April 3, 1903 – August 2, 2026 | |
| Snowfall | April 3, 1903 – 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 118°F (48°C), set on August 10, 1936.
What is the coldest temperature ever recorded in McKinney, TX?
The all-time record low in McKinney, TX is -7°F (-22°C), set on January 18, 1930.
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 12.10 inches, on September 21, 1964.
What is the biggest snowfall ever recorded in McKinney, TX?
The most snow recorded in one calendar day near McKinney, TX is 7.0 inches, on January 16, 1964.
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