Ballwin receives its highest rainfall in May, while humidity peaks during winter months.
🌧️ Wettest:May — 122 mm☀️ Driest:Feb — 58 mm
💧 Humidity peaks at 83% in Jan · annual avg 76%
🌍 Climate Summary
Avg Annual Temp:55.9°F
Avg Annual Rainfall:1079 mm
Avg Humidity:76%
Data Period:1981 – 2025
Ballwin Climate Overview
Ballwin has a warm temperate climate with warm summers and freezing winters.
Temperatures peak in Aug and drop to their lowest in Jan,
while rainfall is highest during spring and early summer months.
Humidity remains high throughout the year, especially during winter months, creating cold and damp conditions.
📈 Yearly Trends
The warmest year in Ballwin's recorded history was 2012
(avg: 60.6°F),
while the coldest year was 1985
(avg: 50.7°F),
based on annual average temperatures.
📊 Key Climate Trends
🌡️ Ballwin's temperature shows a slight warming trend over the past decade
📈 Minimum temperatures show a slight warming trend in recent years
🌧️ Rainfall has decreased in recent years compared to earlier periods
🌡️ Annual Temperature Trend
View Range:
Average annual high/low · Last 10 years · °F
Ballwin's temperatures shows a slight warming trend over the past decade.
The highest recorded temperature reached
109.1°F in Jul 1999,
while the lowest dropped to
-18.8°F in Jan 1985.
🌧️ Annual Precipitation
View Range:
Total annual precipitation · Last 10 years · mm/year
Annual rainfall in Ballwin shows noticeable variation. Rainfall has decreased in recent years compared to earlier periods.
Based on 45 years of data (1981–2025), Aug is typically the hottest month in Ballwin, Missouri, with average high temperatures around 99.7°F.
What is the coldest month in Ballwin?▼
Jan is the coldest month in Ballwin, with average low temperatures around 2.9°F.
What is the rainiest month in Ballwin?▼
May receives the most rainfall with approximately 122 mm, while Feb is the driest with 58 mm.
What was the highest temperature ever recorded in Ballwin?▼
The highest recorded temperature was 109.1°F in Jul 1999. This is part of the historical record spanning 1981–2025.
What was the lowest temperature ever recorded in Ballwin?▼
The lowest recorded temperature was -18.8°F in Jan 1985.
How many years of data does this page cover?▼
This page covers 45 years of climate data from 1981 to 2025. As new data is added to the database the page automatically reflects the updated coverage.
How much sunlight does Ballwin get?▼
Ballwin receives the most sunlight in Jun with an average solar radiation of 6.25 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning, agriculture, and understanding seasonal sunshine availability in Missouri.
Where does this weather data come from?▼
All climate data is sourced from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite and model data. It provides monthly averages for temperature, precipitation, humidity, wind speed, and solar radiation.
📚 Data Source
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources), a NASA project providing solar and meteorological data for renewable energy, building efficiency, and agricultural research.