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St. Louis climate planning
St. Louis offers a long warm season with heat, humidity, and winter route questions
The climate ledger lists an 86.2°F average summer high, about 25 days above 90°F, a 25.8°F average winter low, about 100 days below freezing, 76 percent humidity, five comfortable months, and 1,526 peak sun hours per year. The modeled multi year fine particle baseline is 7.2 micrograms per cubic meter for 2021 through 2025, and allergy levels are Poor.
May, June, August, September, and October are the listed best months, while February, January, and December are toughest. Review cooling, shade, hydration, humidity, allergies, heating, ice, storm preparation, flood insurance, power, and the route to care before choosing a home.
Living through the seasons
Summers are the easier season. Winter comfort deserves a closer look.
- Overall Comfort
- Good
2.7 / 5
- Average Summer High
- 86°F
- Days Above 90°F
- 25 days/year
- Summer Feel
- Very Good
Warm · 86°F
Excellent
4.1 / 5
- Average Winter Low
- 26°F / -3°C
- Days Below Freezing
- 100 days/year
- Winter Feel
- Moderate
Fair
Fair
1.9 / 5
The shape of the year
Humidity, comfortable months, and sunshine show how the seasons differ.
- Humidity
- 76%
- Comfortable Months
- 5 months
- Solar Exposure
- 1526 peak sun hrs/yr
Good
Fair
Poor
Air, allergies, and weather
Air quality and allergies shape day to day comfort. The best months and weather risks help with timing.
Air and allergies
- Air Quality
- Excellent
- Allergy Levels
- Poor
4.7 / 5
Current AQI
Checking…
Current PM2.5
Checking…
Timing and weather
- Long Term Fine Particle Pollution
- 7.2 µg/m³ 2021-2025 modeled average
- Best Months
- May, Jun, Aug, Sep, Oct
- Toughest Months
- Feb, Jan, Dec
- Heat Risk
- Moderate
- Drought Risk
- Medium (0.4-0.6)
- Weather Volatility
- Limited
Good · 7.2 µg/m³ 2021-2025 modeled average
Good
2.6 / 5
St. Louis in everyday life
Could St. Louis work for you?
What may work well
- For St. Louis, the May, June, August, September, and October month group and five comfortable months give outdoor planning a useful window.
- The 86.2°F summer high, 25.8°F winter low, and 1,526 sun hours provide concrete home comfort inputs.
- The modeled fine particle baseline is published separately from Poor allergy levels, allowing a more careful indoor air review.
What to think about
- About 100 freezing days add heating, ice, parking, maintenance, medications, and care route questions.
- Poor allergies, 76 percent humidity, heat, and seasonal weather can change outdoor time, cooling, and reserve needs.
- High flood, storm, heat, and natural disaster rows can affect insurance, drainage, power, parking, transit, airport trips, and the route home.
Plan St. Louis climate around heat, winter, hazards, and home comfort
Review the home in winter
At a St. Louis address, check heating, insulation, entry, stairs, sidewalks, parking, ice response, medications, groceries, care routes, vehicle readiness, power, and backup rides.
Plan for summer heat
At the chosen St. Louis home, review cooling, shade, windows, indoor air, humidity, utility planning, hydration, outdoor timing, allergies, parking, and the route from care or recreation.
Pair air and hazard planning
Use the modeled 7.2 microgram multi year fine particle baseline, Poor allergies, High flood, storm, heat, and natural disaster rows, Low wildfire, insurance, power, water, and reserve questions together.
Use the decision actions
Save the strongest seasonal plan, Compare another city address, and choose Find my fit after heat, allergies, freezing days, flood, storm, heating, cooling, and route questions are answered.
Questions retirees ask
How hot is a St. Louis summer?
The average summer high is 86.2°F and the ledger lists about 25 days above 90°F. Review cooling, shade, hydration, humidity, indoor air, utility planning, mobility, and personal tolerance.
What do about 100 freezing days mean for retirement?
They add heating, ice, stairs, sidewalks, parking, groceries, medications, care routes, maintenance, vehicle readiness, and backup transportation to the home review.
What does the fine particle baseline mean?
The modeled multi year fine particle baseline is 7.2 micrograms per cubic meter for 2021 through 2025. Pair it with Poor allergy levels, filters, ventilation, moisture, humidity, and personal sensitivity.
When are outdoor plans easiest?
May, June, August, September, and October are the listed best months, while February, January, and December are toughest. Check actual conditions, surfaces, allergies, mobility, and weather before an outing.
What should a flood and storm home review include?
Check drainage, flood insurance, roof, trees, power, parking, water, alternate routes, vehicle placement, medications, care access, cooling, and the household response plan.
St. Louis offers a useful warm season and five comfortable months, provided the home handles about 100 freezing days, Poor allergies, humidity, High flood, storm, heat, and natural disaster rows, heating, cooling, power, and route questions. Save the strongest seasonal plan, Compare another city address, and choose Find my fit after the home review.
Sources
Climate comfort helps estimate how practical daily life may feel across the year, especially for heat, humidity, cold, and seasonal constraints.
Seasonal timing, health conditions, air conditioning, air quality, and elevation can change the lived experience.
- NASA POWER
Used for Overall Comfort, Summer Feel, Average Summer High, Days Above 90°F, Winter Feel, Average Winter Low, Days Below Freezing, Humidity, Comfortable Months, Solar Exposure, Best Months, Toughest Months, Allergy Levels, Heat Risk, Weather Volatility
- Open-Meteo / Copernicus CAMS, checked against U.S. EPA AirData
Used for Air Quality, Long-Term Fine-Particle Pollution
Checked 2026-05-18
- World Resources Institute (WRI)
Used for Drought Risk
Checked 2026-07-13
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