Grand Blanc receives its highest rainfall in Aug, while humidity peaks during winter months.
🌧️ Wettest:Aug — 89 mm☀️ Driest:Feb — 46 mm
💧 Humidity peaks at 88% in Jan · annual avg 78%
🌍 Climate Summary
Avg Annual Temp:47.8°F
Avg Annual Rainfall:858 mm
Avg Humidity:78%
Data Period:1981 – 2025
Grand Blanc Climate Overview
Grand Blanc has a temperate climate with warm summers and freezing winters.
Temperatures peak in Aug and drop to their lowest in Jan,
while rainfall is highest during summer months.
Humidity remains high throughout the year, especially during winter months, creating cold and damp conditions.
📈 Yearly Trends
The warmest year in Grand Blanc's recorded history was 2012
(avg: 51.8°F),
while the coldest year was 2014
(avg: 43°F),
based on annual average temperatures.
📊 Key Climate Trends
🌡️ Grand Blanc'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
Grand Blanc's temperatures shows a slight warming trend over the past decade.
The highest recorded temperature reached
100°F in Jul 1988,
while the lowest dropped to
-20.1°F in Feb 2014.
🌧️ Annual Precipitation
View Range:
Total annual precipitation · Last 10 years · mm/year
Annual rainfall in Grand Blanc 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 Grand Blanc, Michigan, with average high temperatures around 89°F.
What is the coldest month in Grand Blanc?▼
Jan is the coldest month in Grand Blanc, with average low temperatures around -3.8°F.
What is the rainiest month in Grand Blanc?▼
Aug receives the most rainfall with approximately 89 mm, while Feb is the driest with 46 mm.
What was the highest temperature ever recorded in Grand Blanc?▼
The highest recorded temperature was 100°F in Jul 1988. This is part of the historical record spanning 1981–2025.
What was the lowest temperature ever recorded in Grand Blanc?▼
The lowest recorded temperature was -20.1°F in Feb 2014.
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 Grand Blanc get?▼
Grand Blanc receives the most sunlight in Jun with an average solar radiation of 6.10 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning, agriculture, and understanding seasonal sunshine availability in Michigan.
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.