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Sunshine

Sunshine is direct sunlight reaching the Earth's surface, producing visible light and radiant heat.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

Sunshine is direct sunlight reaching the Earth's surface, producing visible light and radiant heat. In weather and climate contexts, it refers to the duration or amount of direct solar radiation received at a location. The amount of sunshine at a location depends strongly on cloud cover, season, latitude, and time of day.

Definition

Sunshine refers to the sun’s direct light and warmth reaching a surface. In meteorology, it is often discussed as the amount of direct solar radiation or the number of hours with direct sun exposure.

Measurement

Meteorological records often express sunshine as duration, such as daily, monthly, or annual sunshine hours. The amount varies with clouds, atmospheric conditions, latitude, and the sun’s angle above the horizon.

Composition

At Earth’s surface, sunlight is made up mainly of visible light, with smaller portions of ultraviolet and infrared radiation. The visible portion makes up nearly half of the total radiation received at the surface.

Variation by location

Sunshine is much more abundant in dry, cloud-free regions than in stormy or overcast climates. Britannica notes that some places receive over 4,000 hours of sunlight per year, while others receive less than 2,000.

Key facts

  • Sunshine is commonly used to mean direct solar radiation at Earth’s surface.
  • The amount of sunshine at a location depends strongly on cloud cover.
  • Sunshine is often measured as sunshine duration, usually in hours per year or per day.
  • Sunlight at Earth’s surface includes visible, ultraviolet, and infrared radiation.
  • Places with frequent storminess generally receive fewer hours of sunshine than dry, clear regions.
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Canadian context

Sunshine is a common weather and climate measure in Canada, where seasonal changes, latitude, cloud cover, and winter darkness create large regional differences in annual sunshine duration.

Frequently asked questions

What is sunshine?
Sunshine is direct sunlight reaching the Earth’s surface, bringing visible light and heat.
Is sunshine the same as sunlight?
The terms are closely related, but sunshine usually emphasizes direct sun exposure, while sunlight is the broader term for solar radiation reaching Earth.
What affects how much sunshine a place gets?
Cloud cover is the biggest factor, along with latitude, season, time of day, and local weather patterns.
How is sunshine measured?
It is commonly measured as the number of hours of direct sunlight at a location over a day, month, or year.
What kinds of radiation are included in sunshine?
Sunshine includes visible light, ultraviolet radiation, and infrared radiation.

References

  1. Britannica — https://www.britannica.com/science/sunlight-solar-radiation
    Supports: Definition of sunlight/sunshine and variation by cloud cover and location
  2. Merriam-Webster — https://www.merriam-webster.com/dictionary/sunshine
    Supports: Dictionary definitions of sunshine
  3. Wikipedia — https://en.wikipedia.org/wiki/Sunlight
    Supports: General description of sunshine as direct solar radiation and basic spectral composition