What 30 days of border history can and cannot tell you

Historical waits are useful for patterns, not promises. Treat them as planning context beside live updates.

Thirty days is enough to notice repeated daily rhythms, but not enough to guarantee tomorrow. Staffing, incidents, holidays, construction, and weather can break the pattern.

Look for direction first. If recent history shows certain hours easing, those windows are better candidates for alerts and flexible travel.

Check coverage before leaning on the pattern. Sparse or old rows are useful context, not a reason to ignore the current wait page.

For local summaries, include the source, row count, newest timestamp, and limits instead of quoting a single average without context.