To ensure accurate information, listings for television programming must be updated regularly. It is often updated nightly, but it can be updated more frequently should the information be available in time.
On average it is updated every 1-3 years but this can vary depending on the area being updated. Larger cities such as New, York, London and Dallas would be updated more often then a small little known town or village would.
Accuweather forecasts are updated every 4 hours, current conditions are updated hourly, indexes are updated every 6 hours, hour-by-hour is updated every hour, moon phases once a day, and maps are updated every 12 hours.