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Climate Progression

Route 66 crosses multiple climate zones, with dramatic weather changes as you travel west. Understanding these shifts helps with packing and planning. 

Location 

Spring High/Low 

Summer High/Low 

Fall High/Low 

Notes 

Chicago, IL 

62°F / 44°F 

84°F / 64°F 

63°F / 47°F 

Humid with afternoon storms 

St. Louis, MO 

68°F / 48°F 

89°F / 70°F 

69°F / 50°F 

Hot and sticky summers 

Tulsa, OK 

72°F / 51°F 

93°F / 72°F 

74°F / 53°F 

Great Plains weather 

Amarillo, TX 

68°F / 42°F 

91°F / 65°F 

70°F / 44°F 

Dry with strong winds 

Albuquerque, NM 

66°F / 40°F 

92°F / 64°F 

70°F / 44°F 

High desert, cool nights 

Flagstaff, AZ 

56°F / 30°F 

81°F / 50°F 

62°F / 35°F 

Mountain elevation 

Los Angeles, CA 

68°F / 52°F 

84°F / 64°F 

75°F / 58°F 

Mediterranean coastal 

Seasonal Travel Considerations

Spring (April-May): Ideal Route 66 conditions with comfortable temperatures, wildflowers blooming across desert regions, and numerous festivals. The Gathering of Nations (Albuquerque's powwow) occurs in late April. Winslow's Standin' on the Corner Festival celebrates the Eagles song in late September, but the event moves to spring in some years. 

Summer (June-August): Peak season brings extreme desert heat (100°F+), the highest campground rates, and maximum crowds. Benefits include all attractions operating full hours and the longest daylight for driving. The Albuquerque International Balloon Fiesta occurs in early October (technically fall). 

Fall (September-October): The sweet spot for Route 66 travel. Comfortable desert temperatures, spectacular photography light, fall colors in Midwest sections, and major festivals, including the Balloon Fiesta and various Route 66 festivals. Book accommodations early for festival dates. 

Winter (November-March): Lowest rates and minimal crowds, but snow and ice are possible in Flagstaff, Williams, and other elevated areas. Some attractions reduce hours. Desert sections remain pleasant. 

RV Recommendations and Practical Tips

Class C Motorhomes provide optimal Route 66 balance: comfortable for three weeks yet maneuverable through small towns. Full kitchens and bathrooms ensure self-sufficiency during extended travel. 

Class A Motorhomes deliver maximum comfort with resort-style amenities perfect for extended journeys. However, tight turns in Oatman, Seligman, and some vintage town centers can challenge larger rigs. 

Class B Campervans work well for couples prioritizing fuel efficiency and easy parking in urban areas like Los Angeles. 

Essential features include air conditioning (critical for desert sections), unlimited generator use (included with all El Monte RV rentals), a backup camera for vintage motel parking lots, and an awning for midday shade. 

Mileage & Fuel Planning: Budget approximately 2,800-3,200 total miles (including side trips and urban exploration). RV fuel economy varies by class (8-12 MPG), so estimate $1,200-$1,800 for fuel. Additional miles available through Travel Extras

Practical Tips:

Route 66 FAQs

Three weeks provide perfect pacing for complete exploration. You'll average 120 miles daily with extensive time for attractions, festivals, side trips, and spontaneous discoveries that make Route 66 magical. 

Yes, especially for summer and fall weekends. Reserve KOA campgrounds and popular destinations (Flagstaff, Albuquerque, Los Angeles) 2-3 months in advance. Spring and winter offer more flexibility. 

Absolutely. The 21-day pace prevents overwhelming kids, and roadside attractions, museums, and quirky stops naturally engage children. Pack activities for driving days. 

New Mexico and Arizona deliver the most dramatic landscapes, but every state offers a unique appeal. Illinois' small towns, Oklahoma's pride, Texas' big sky, and California's diversity all contribute to Route 66's character. 

Budget $1,500-$2,500 for fuel, $800-$1,200 for campgrounds (using KOA rates), $1,000-$2,000 for food (cooking in RV reduces costs), and $500-$800 for attractions and activities. Total non-rental costs: approximately $3,800-$6,500, depending on choices. 

Conclusion

Route 66 represents America's story: innovation, optimism, struggle, adaptation, and preservation. This 21-day complete exploration provides time to truly understand what made this highway America's Main Street and why its preservation matters. 

From Chicago's urban energy through the agricultural heartland, across the Great Plains and the painted deserts, through the mountain forests to the Pacific shores and Los Angeles' sprawling complexity, Route 66 delivers unmatched variety and authentic American experiences. 

Traveling in an El Monte RV means experiencing Route 66 with legendary freedom: waking up where you choose, stopping when inspiration strikes, and creating memories at your own pace. 

Ready to plan your complete Route 66 exploration? Explore RV options at El Monte RV Rentals and check current promotions at Rental Deals