Understanding Weather Forecast Terminology: A Guide for Non-Technical Users

Weather forecasts are essential tools for planning daily activities, yet the terminology used can often be confusing. This guide aims to demystify common weather terms, enabling you to interpret forecasts with confidence.

Sky Conditions

Sky conditions describe the amount of cloud cover in the atmosphere:

• Clear/Sunny: 1/8 or less of the sky covered by clouds.
• Mostly Clear/Mostly Sunny: 1/8 to 3/8 cloud cover.
• Partly Cloudy/Partly Sunny: 3/8 to 5/8 cloud cover.
• Mostly Cloudy: 5/8 to 7/8 cloud cover.
• Cloudy: 7/8 to 8/8 cloud cover.

These terms help you understand how much of the sky is expected to be covered by clouds during a specific period. (weather.gov)

Temperature Ranges

Forecasts often use terms to indicate temperature ranges:

• Lower 50s: Temperatures between 50°F and 54°F.
• Mid 50s: Temperatures between 55°F and 59°F.
• Upper 50s: Temperatures between 60°F and 64°F.

These descriptors provide a quick understanding of the expected temperature range. (weather.gov)

Wind Descriptions

Wind forecasts include both direction and speed:

• Light Wind: 0-5 mph.
• Breezy: 15-25 mph.
• Windy: 20-30 mph.
• Very Windy: 30-40 mph.
• Strong/Dangerous Winds: 40 mph or greater.

These terms help you gauge the expected wind conditions and plan accordingly. (weather.gov)

Precipitation Probability

The likelihood of precipitation is expressed as a percentage:

• 0%: No precipitation expected.
• 10%: Isolated showers possible.
• 20%: Slight chance of precipitation.
• 30-50%: Chance of precipitation.
• 60-70%: Likely precipitation.
• 80-100%: Occasional or periods of precipitation expected.

Understanding these percentages helps you prepare for potential weather changes. (weather.gov)

Additional Terms

• Thundery Showers: Precipitation from cumulonimbus clouds accompanied by thunder and lightning, and sometimes strong wind gusts at the ground. (weather.gov.sg)
• Hazy: Suspension of particulate matter (e.g., dust, smoke particles) in the air, causing reduced visibility. (weather.gov.sg)

By familiarizing yourself with these terms, you can interpret weather forecasts more accurately and make informed decisions about your daily activities.