March on the GR 20 remains wintry at elevation. High ridgelines see frequent snowfall and sub-zero nights, while lower
sections alternate between cool sunshine and rain. Highs span roughly 0–20°C across the route, with mountain lows
dropping to around -13°C. Precipitation is changeable: drizzle and moderate rain intermingle with heavy snow episodes,
and daily totals sometimes exceed 40 mm. Cloud cover varies quickly from overcast to clear, producing abrupt swings from
snowy to bright conditions.
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From Calenzana, conditions vary between light drizzle, overcast spells, and sunny breaks, with highs 8–16°C and lows 5–11°C; occasional snowfall also appears, and daily precipitation reaches about 16 mm. Climbing to Ortu, temperatures drop to highs 0–13°C and lows -8–5°C, with frequent snowfall mixed with clear intervals and wet days that can bring around 28 mm. Continuing to Carozzu, highs run 2–11°C and lows -3–4°C; recurring snow, sometimes heavy up to 19 mm, alternates with partly cloudy periods.
At Asco Stagnu, a wintry mix persists: highs 1–12°C and lows -5–1°C, with snow common and occasional heavy falls producing up to 21 mm. Over the ridge toward Tighettu, it turns colder, with highs -1–5°C and lows -9–-1°C, and frequent heavy snow peaking near 26 mm. Overcast stretches are interspersed with brief lulls.
Ciottulu di i Mori remains harsh, with highs -3–6°C and lows -11–0°C; alternating clear breaks with moderate to heavy snowfall totals up to 19 mm, and occasional rain at times. Toward Manganu, highs are 1–8°C and lows -13–0°C, with bursts of heavy snowfall reaching 26 mm. Skies swing between partly cloudy and overcast.
At Petra Piana, highs range -2–7°C and lows -10–-1°C; moderate and heavy snowfall up to 11 mm mixes with rainy episodes up to 15 mm. Descending to Onda, the range widens to highs -3–14°C and lows -6–5°C, with very heavy snowfall events up to 42 mm punctuated by clear spells. Reaching Vizzavone, highs 2–16°C and lows -2–7°C, a mix of light snow and rain alternates with dry, partly cloudy periods and occasional totals near 16 mm.
At Capanelle, conditions oscillate from light drizzle to moderate snowfall and occasional heavier rain, with highs -2–12°C and lows -8–2°C; daily precipitation can approach 43 mm. Continuing to Prati, highs -2–11°C and lows -8–0°C, overcast spells alternate with clear breaks, and moderate snowfall reaches about 19 mm. Several days pass dry or only lightly drizzly.
Around Usciolu, highs span -1–14°C and lows -7–4°C; showers and drizzle appear at times, heavier rain peaks near 24 mm, and periodic snowfall returns under overcast skies. At Matalza, highs 2–13°C and lows -5–4°C, a mainly cloudy pattern brings intermittent drizzle, with moderate snowfall around 9 mm and occasional clearer windows. Cloud cover often lingers.
Near Asinau, highs -1–13°C and lows -7–1°C, overcast periods mix with bright breaks; heavy snowfall reaches about 17 mm and rain can total up to 24 mm. Around I Paliri it turns milder, with highs 5–15°C and lows -5–5°C; scattered light to moderate rain reaches about 21 mm, with rare light snow. Finishing toward Conca, highs 11–20°C and lows 2–9°C, mostly dry intervals intersperse with brief showers up to 13 mm under alternating cloud and sun.
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