Nampa receives its highest rainfall in Dec, while humidity peaks during winter months.
🌧️ Wettest:Dec — 49 mm☀️ Driest:Jul — 8 mm
💧 Humidity peaks at 78% in Jan · annual avg 54%
🌍 Climate Summary
Avg Annual Temp:54.9°F
Avg Annual Rainfall:345 mm
Avg Humidity:54%
Data Period:1981 – 2025
Nampa Climate Overview
Nampa has a warm temperate climate with warm summers and freezing winters.
Temperatures peak in Jul and drop to their lowest in Jan,
while rainfall is highest during winter months.
Humidity remains relatively low throughout the year, especially during winter months, creating cold and dry conditions.
📈 Yearly Trends
The warmest year in Nampa's recorded history was 2020
(avg: 58.1°F),
while the coldest year was 1985
(avg: 49.8°F),
based on annual average temperatures.
📊 Key Climate Trends
🌡️ Nampa's temperature has remained relatively stable over the past decade
📈 Minimum temperatures show a slight warming trend in recent years
🌧️ Rainfall has increased noticeably in recent years compared to earlier periods
🌡️ Annual Temperature Trend
View Range:
Average annual high/low · Last 10 years · °F
Nampa's temperatures has remained relatively stable over the past decade.
The highest recorded temperature reached
110.9°F in Jun 2015,
while the lowest dropped to
-13.2°F in Jan 2017.
🌧️ Annual Precipitation
View Range:
Total annual precipitation · Last 10 years · mm/year
Annual rainfall in Nampa shows noticeable variation. Rainfall has increased noticeably in recent years compared to earlier periods.
Based on 45 years of data (1981–2025), Jul is typically the hottest month in Nampa, Idaho, with average high temperatures around 104.7°F.
What is the coldest month in Nampa?▼
Jan is the coldest month in Nampa, with average low temperatures around 10.7°F.
What is the rainiest month in Nampa?▼
Dec receives the most rainfall with approximately 49 mm, while Jul is the driest with 8 mm.
What was the highest temperature ever recorded in Nampa?▼
The highest recorded temperature was 110.9°F in Jun 2015. This is part of the historical record spanning 1981–2025.
What was the lowest temperature ever recorded in Nampa?▼
The lowest recorded temperature was -13.2°F in Jan 2017.
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 Nampa get?▼
Nampa receives the most sunlight in Jul with an average solar radiation of 7.65 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning, agriculture, and understanding seasonal sunshine availability in Idaho.
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.