I run a small golf weather data project (scoring US course playability daily from hourly forecasts), and the most consistent pattern in the data is how much the 6–10am window beats 12–4pm once summer sets in.
What the numbers look like:
- Morning wind at most inland courses runs 5–10 mph. By early afternoon it's routinely 15–20 mph with gusts past 25. A 15 mph crosswind moves a well-struck iron 10–15 yards offline.
- For a 200–240 yard carry off the tee, a 15 mph headwind costs 20–30 yards of effective distance — your comfortable 7-iron approach becomes a 5-iron.
- Temperature: a 7am July tee time might play 72→85°F. A 1pm start plays 92°F+ most of the round, and performance measurably degrades above ~85°F.
- Southeast in summer: the afternoon convective cycle means lightning risk climbs sharply after 2pm — mornings aren't just more comfortable, they're the difference between finishing 18 and sitting in the clubhouse.
Big exception: Pacific coastal courses under marine layer, where calm cool mornings are foggy and afternoons can actually be the better window.
Curious whether your home course follows the pattern or breaks it — what's your experience with morning vs afternoon conditions?