Weather and seasons
May, June and September: firm dry chalk, long or workable daylight, orchids and other chalk-grassland flora at their best (June) or still going (May, September), and — crucially on a trail with no natural water on the ridge — warm rather than genuinely hot.
This is a chalk-ridge trail, and the chalk defines almost everything about walking it seasonally: it drains and dries fast, so it is walkable in some form all year, but it also holds essentially no water and offers almost no shade, so the height of summer is a heat-and-water problem rather than a mud problem. Nothing sits directly on the ridge route itself at any point in the year — every pub, shop, water tap and B&B is a deliberate detour down into a valley village — which matters more in July-August (when you need water most) and less in winter (when it's everywhere anyway, if frozen). May, June and September are the sweet spot: dry firm going, the best of the flora, and temperatures that don't turn the water gap into a real problem.
Short days and an exposed, shelterless ridge, but the chalk drains and dries far faster than a clay trail — the ground itself is rarely the problem here, ice is.
8°C high · 3-4°C low · ~8.5 hrs (sunrise ~07:55, sunset ~16:25)Watch for: Ice and green chalk on the steeper descents; daylight of well under 9 hours limits any stage.An hour and a half more daylight than January, with the same green-chalk/ice risk after any cold snap and the same shelterless exposure.
8-9°C high · 3°C low · ~10.0 hrs (sunrise ~07:20, sunset ~17:20)Watch for: Same ice/green-chalk risk as January; a clear, calm day gives excellent long-distance ridge views.Daylight lengthens fast and the chalk is drying out from any winter ice, though a late frost can still bring green chalk back on shaded sections.
11°C high · 4-5°C low · ~11.9 hrs (sunrise ~06:25, sunset ~18:20, clocks change late in the month)Watch for: Still exposed to equinoctial gales on the open ridge.Reliable dry chalk, long enough days for full stages, and none of the summer water-carrying pressure yet.
13-14°C high · 6-7°C low · ~13.9 hrs (BST from late March; sunrise ~06:15, sunset ~20:05)Watch for: Nights are still cold; the ridge catches any residual spring wind.Firm dry chalk, long daylight, and warm without the peak-summer heat that makes the ridge's lack of water a real issue. Skylarks and early orchids are at their best.
16-17°C high · 9-10°C low · ~15.5 hrs (sunrise ~05:30, sunset ~20:50)Watch for: Ticks becoming active in the grassland and scrub margins.The longest days of the year and the peak of the chalk-grassland orchid display, still generally warm rather than hot. Worth starting to carry more water as the month warms up.
19-20°C high · 12°C low · ~16.6 hrs (sunrise ~04:45, sunset ~21:20, longest days of the year)Watch for: Ticks; start carrying more water than you think you need — there is nothing natural on the ridge itself.Warm, reliable weather sounds appealing, but this trail's defining seasonal problem shows up hardest now: an almost entirely shadeless ridge with no natural water sources and long gaps between villages that lie off-route down in the valleys. Combined with school-holiday crowds, this is a genuinely tougher month than the temperature alone suggests.
21-22°C high · 14°C low · ~16.4 hrs (sunrise ~05:05, sunset ~21:15)Watch for: Heat and water are the real issue here: carry more than you think you'll need, since there is no natural water on the ridge and the nearest tap or pub can be a real detour away.Same water and shade problem as July, at the same time as the busiest month for day visitors at the honeypot viewpoints.
21-22°C high · 14°C low · ~14.9 hrs (sunrise ~05:50, sunset ~20:40)Watch for: Heat and water remain the binding constraint on a comfortable day; the exposed ridge gives no relief from direct sun.Temperatures ease off the July-August peak, the water problem becomes far less pressing, and the trail empties out once schools return. Round-headed rampion and other late chalk flowers are still good into the month.
19°C high · 12°C low · ~12.6 hrs (sunrise ~06:35, sunset ~19:15, equinox late in the month)Watch for: Still worth carrying proper water on a warm early-September day.Cooling temperatures and the water pressure gone, with beech and ash colour in the dip-slope woodland; rain and daylight both start working against a stage by the end of the month.
16°C high · 9-10°C low · ~10.7 hrs (BST for most of the month; clocks change late in the month)Watch for: The clock change midway through the month cuts a further hour of usable light.Daylight drops fast and green chalk/ice become a real possibility again after any cold, wet spell, though the chalk's fast drainage still keeps this more walkable than a typical clay-based winter trail.
12°C high · 6-7°C low · ~9.1 hrs (sunrise ~07:00, sunset ~16:05)Watch for: Green chalk and ice on steep descents after a cold snap; wind exposure on the open ridge.The shortest days of the year and the winter ice/green-chalk risk at its worst, offset by the same fast chalk drainage that keeps this trail more walkable in winter than most.
9°C high · 3-4°C low · ~8.2 hrs (sunrise ~07:55, sunset ~16:00, shortest days of the year)Watch for: Under 8.5 hours of daylight is the binding constraint; watch for ice on the chalk descents.