Extreme atmospheric conditions can cause significant variations in the times of sunrise and sunset. Two of the most prominent atmospheric factors are temperature and pressure. This page allows you to display sunrise and sunset times for a specific temperature and pressure.

Where can I find this information?
Here are some government websites where you'll find the current temperature and pressure reported by your local weather station:
The following links take you to other sites that are beyond the control of MyZmanim. We cannot take responsibility for any content provided by these sites.
United States: weather.gov (Enter your ZIP code, click International System of Units and read current conditions.)
Israel: ims.gov.il
Canada: weatheroffice.gc.ca
United Kingdom: metoffice.gov.uk
Everywhere else: weather.noaa.gov - Go to International Weather Conditions

Temperature and pressure vary with elevation. Therefore, if you intend to obtain your current temperature and pressure from a local weather station, please confirm that the given station is at the same elevation as the place where you'll be using the zmanim. If you measure the temperature and pressure directly using your own thermometer and barometer (or a "home weather station"), this will not be a concern.

Caution: Entering the wrong information will produce incorrect zmanim. If there's something you don't know, please leave it set to "auto".

Caution: The extent to which atmospheric conditions impact the zmanim varies depending on location, season and elevation. Please do not assume that the impact in one location will be the same as the impact in another, or that the impact during one season will be the same as the impact during another.