Texas has some of the hottest summers in the United States, with 6 major cities each facing distinct heat challenges. Understanding your local climate is essential for choosing the right outdoor cooling equipment — what works in El Paso's dry heat fails in Houston's humidity.
Texas City Heat Comparison
| City | Avg Summer Temp | Avg Humidity | 100°F+ Days/Year | Climate Zone |
|---|---|---|---|---|
| Houston | 94°F | 75% | 28 | humid |
| Dallas | 96°F | 55% | 42 | semi-arid |
| Austin | 97°F | 60% | 45 | semi-arid |
| San Antonio | 96°F | 65% | 38 | humid |
| Fort Worth | 96°F | 53% | 40 | semi-arid |
| El Paso | 98°F | 25% | 55 | arid |
What the Numbers Mean for Cooling
Humid Cities: Houston & San Antonio
High humidity (>65%) means evaporative cooling is less effective. In Houston (75% humidity) and San Antonio (65%), the air is already saturated with moisture, leaving little room for evaporative cooling to work. Portable AC units that actively remove humidity are the most reliable choice for enclosed spaces in these cities.
Semi-Arid Cities: Dallas, Fort Worth & Austin
Moderate humidity (53-60%) gives you flexibility in equipment choice. Evaporative coolers work well on most summer days in the DFW metroplex and Austin. On peak humidity days, performance drops but remains acceptable for open-air applications.
Arid City: El Paso
Low humidity (25%) makes El Paso ideal for evaporative cooling. Despite having the highest temperatures (98°F average) and most 100°F+ days (55/year), El Paso's dry air allows evaporative coolers to achieve maximum efficiency — dropping temperatures 25-30°F at a fraction of AC cost.
Heat Index vs. Temperature
The heat index (“feels like” temperature) combines air temperature and humidity. This is what matters for cooling equipment sizing and OSHA compliance:
| Air Temp | Houston (75%) | Dallas (55%) | El Paso (25%) |
|---|---|---|---|
| 90°F | 106°F ⚠️ | 96°F | 88°F |
| 95°F | 117°F 🔴 | 104°F ⚠️ | 92°F |
| 100°F | 132°F 🔴 | 114°F 🔴 | 97°F |
| 105°F | 150°F+ 🔴 | 126°F 🔴 | 103°F ⚠️ |
⚠️ Extreme Caution | 🔴 Danger — heat illness likely with prolonged exposure
Equipment Recommendation by City
| City | #1 Choice | #2 Choice | Avoid |
|---|---|---|---|
| Houston | Portable AC | Misting Fan (outdoor only) | Evaporative Cooler (too humid) |
| Dallas | Evaporative Cooler | Portable AC | — |
| Austin | Evaporative Cooler | Portable AC | — |
| San Antonio | Portable AC | Evaporative Cooler (open-air) | — |
| Fort Worth | Evaporative Cooler | Portable AC | — |
| El Paso | Evaporative Cooler | Misting Fan | Portable AC (unnecessary expense) |
Not sure what you need? Use our BTU calculator for a personalized recommendation based on your city, space, and use case.