Question 1

What is ForecastCheck?

Accepted Answer

ForecastCheck tracks weather forecast accuracy by comparing predictions from the National Weather Service with actual observed temperatures across US cities.

Question 2

What is Mean Absolute Error (MAE)?

Accepted Answer

MAE measures how many degrees forecasts are typically off from actual temperatures. Lower values indicate more accurate forecasts.

Question 3

What does forecast bias mean?

Accepted Answer

Bias shows if forecasts consistently predict too hot (+) or too cold (-). A value near zero means forecasts are well-calibrated.

Question 4

How is accuracy calculated?

Accepted Answer

Accuracy is the percentage of forecasts that fall within 3 degrees Fahrenheit of the actual observed temperature.

Collecting Data