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Best Time for the Route 66
Sweet spot: February, January, May — computed from NASA POWER climate normals across the route's overnight towns, balancing temperature, rainfall and daylight.
High-desert stretches top 38°C — drive mornings, museum-hop afternoons, and never skip a fuel stop in the Texas panhandle.
Flagstaff sits at 2,100 m — snow and black ice are normal even when Phoenix bakes; check I-40 conditions daily.
| Month | Temp | Rain | Daylight | |
|---|---|---|---|---|
| January | -15.5–22.3°C | 46 mm | 9.8 h | ❄ |
| February | -14.2–24.7°C | 47 mm | 10.6 h | ❄ |
| March | -9.5–28.3°C | 49 mm | 11.7 h | ❄ |
| April | -3.9–32.3°C | 53 mm | 12.9 h | ❄ |
| May | 0.9–35.3°C | 64 mm | 13.9 h | ❄ |
| June | 7.3–39.7°C | 53 mm | 14.5 h | |
| July | 12.3–41.2°C | 60 mm | 14.2 h | |
| August | 11.1–39.8°C | 63 mm | 13.4 h | |
| September | 5.2–38.2°C | 48 mm | 12.2 h | ❄ |
| October | -2.9–33.1°C | 53 mm | 11.1 h | ❄ |
| November | -7.2–27.3°C | 38 mm | 10.0 h | ❄ |
| December | -12.4–22.5°C | 47 mm | 9.5 h | ❄ |