"optimal weather" is correct and usable in written English.
You can use it to describe a situation when the weather is perfect for a certain activity, such as a hike or a picnic. For example, "We had optimal weather for our beach day - plenty of sunshine and just a few clouds."
-What are the optimal weather conditions to enjoy a tourist experience in this location?
Most of the Jets' games this season have been played in or near optimal weather conditions.
The new runway enabled O'Hare to accommodate 9 percent more flights than the previous summer, which meant 16 more hourly arrivals in optimal weather.
Egg laying coincides with periods favourable for the development and emergence of hatchlings for instance, times of abundant food or of optimal weather conditions.
The experimental pilot system was 4.93 °C warmer than the control pilot system under optimal weather conditions.
This car was not an official Google car, as we are currently not driving through Germany as there are not optimal weather and light conditions at this time of year.
They also noted that at depths less than optimum, instability exists that will either drive soil depth to the optimal weathering depth or to zero depth.
13 The best-fit model from each study was deemed skillful, but no common set of optimal weather-based predictors or time lags has been identified among the studies, suggesting that effective EWSs require careful consideration of local (e.g., city or province scale) environmental factors.
The determination to get back in shape is still alive, but already unforgiving schedules, nagging colds, and less-than-optimal weather conditions have gotten in the way.
IOC spokesman Mark Adams says it's "always a constant battle for winter sports" to maintain optimal conditions when the weather warms up.
The hypothesis of optimal conditions should be lifted, and more realistic conditions should be entered in the model, e.g., rush hour, or severe winter weather, and should be considered not just individually, but also jointly.
