Round Rock, TX All-Time Weather Extremes
The most extreme temperature, precipitation, and snowfall ever recorded in Round Rock, from NOAA daily weather observations.
| Temperature | ||
|---|---|---|
| Record High | 111.9°F (44°C) | September 5, 2000 and August 28, 2011 |
| Record Low | -2°F (-19°C) | January 31, 1949 |
| Lowest High | 19.9°F (-7°C) | January 10, 1962 |
| Highest Low | 84°F (29°C) | July 24, 2018 |
| Highest Mean | 96.0°F (36°C) | August 28, 2011 |
| Lowest Mean | 12.9°F (-11°C) | January 30, 1949 |
| Precipitation | ||
| Max in One Calendar Day | 7.55" (191.8 mm) | November 15, 2001 |
| Max in One Month | 17.59" (446.7 mm) | May 2015 |
| Least in One Month | 0.00" (0.0 mm) | October 1952 |
| Max in One Year | 59.98" (1523.5 mm) | 2015 |
| Least in One Year | 11.45" (290.8 mm) | 1954 |
| Snowfall | ||
| Max in One Calendar Day | 6.5" (16.5 cm) | January 30, 1949 |
| Max in One Month | 7.5" (19.0 cm) | January 1985 |
| Max in One Season | 8.7" (22.0 cm) | 1984-85 |
| Max in One Year | 8.7" (22.0 cm) | 1985 |
| Earliest Snow | 1.0" (2.5 cm) | November 14, 1959 |
| Earliest Measurable Snow | 1.0" (2.5 cm) | November 14, 1959 |
| Latest Snow | 2.0" (5.1 cm) | March 3, 1965 |
| Latest Measurable Snow | 2.0" (5.1 cm) | March 3, 1965 |
| Period of Record | ||
| Temperature | June 1, 1938 – February 5, 2025 | |
| Precipitation | June 1, 1938 – February 5, 2025 | |
| Snowfall | June 1, 1938 – February 6, 2025 | |
Note: Records compiled from NOAA GHCN-Daily observations at AUSTIN-CAMP MABRY (14 mi from Round Rock, 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 Round Rock, TX?
The all-time record high in Round Rock, TX is 111.9°F (44°C), set on September 5, 2000 and August 28, 2011.
What is the coldest temperature ever recorded in Round Rock, TX?
The all-time record low in Round Rock, TX is -2°F (-19°C), set on January 31, 1949.
What is the most rain Round Rock, TX has ever had in one day?
The most precipitation recorded in one calendar day near Round Rock, TX is 7.55 inches, on November 15, 2001.
What is the biggest snowfall ever recorded in Round Rock, TX?
The most snow recorded in one calendar day near Round Rock, TX is 6.5 inches, on January 30, 1949.
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