Choose the time when the forecast and observed conditions suit your aircraft, site and mission. There is no best hour for every location. Compare wind at flight height, gusts, rain, visibility and light for the whole flight, including the return and landing.
Choose a Weather Window
Start with the current local summary, then look at how conditions are expected to change. Check whether the timestamp covers your departure time. A favorable morning observation does not establish the conditions for an afternoon flight. Compare the return and landing time with the departure time. If the mission is delayed, read the forecast again. The free metro pages include an hourly surface-weather table. Hourly drone-altitude winds remain a PRO feature. Keep those two products separate when planning; the surface table cannot replace a wind forecast at your intended height. VectorWX current summary and metro forecasts.
Use the Actual Launch Site
Compare the city-center forecast with the place where you will fly. Trees, buildings, open water and nearby terrain can make the site different from the forecast point. Check the direction of the planned flight and the wind on the return leg. Leave time for a complete equipment check, a weather update and a clear landing plan. If good light occurs during unsuitable wind or rain, choose another window. The best photographic light and the best flight conditions need to be assessed separately. Use the model specifications to check the aircraft limits before choosing the time. Manufacturer model ratings and planning notes.
Check Daylight and Night Requirements
For a Part 107 flight at night, use the FAA requirements for pilot training and anti-collision lighting. Dawn and dusk do not remove the need to assess visibility, clouds or airspace. Review the applicable rules before choosing a flight time. A weather page cannot grant permission for the operation. Check for changes at the site shortly before departure, and keep a clear option to cancel if the weather no longer fits the plan. Record the forecast valid time and the planned landing time in your preflight notes. This makes it easier to identify a stale assessment when the schedule moves. FAA night-operations requirements.
Read Part 107 Weather Requirements. Check current drone weather or the Chicago forecast before planning a local flight.