Same start for all three: Laredo in early January on the resident visa, five weeks in Querétaro while the card is issued. The fork is at San Cristóbal in March (how long to give Mexico first) and at Peñas Blancas in April (turn around in July, or keep going). Each bar is a leg; the strip under it is that base's typical afternoon high in each month it covers, hatched where it rains most afternoons. Tap a leg. The month-by-month map walks any of the three.
| Measure | South · pause · north | Slow: GT + SV only | Stay down |
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The rule the three share: Mexico's spine at 5,000–7,500 ft is 68–78°F in every month but April–May, so Mexico is the leg with no deadline; Central America's lowlands are hot in every month and its highlands are dry December–April, wet May–November with a drier canícula in late July. Honduras and Nicaragua are transits at dawn, never stays. Days are counted as nights at the base; immigration counts entry and exit days too, so add one per border when it is close.