January on the GR 20 is wintry. High ridgelines often stay below freezing, with lows down to -13°C and daytime highs
commonly -3 to 6°C. Lower elevations are milder, with occasional thaws bringing highs of 10-17°C, but nights can still
fall below 0°C. Overcast skies dominate, interspersed with brief clear spells. Precipitation is frequent: rain lower
down and snow higher up, with some days dry and others seeing heavy bursts (peaks around 70 mm in the wettest sections).
Snowfall events recur across the central massif, while drizzle or light rain is more common nearer sea level.
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Starting near sea level, conditions are relatively mild for January: highs at 10-16°C and lows 3-11°C, with frequent overcast, drizzle, and occasional snowfall; daily totals range from 0 to 22 mm. Climbing toward Ortu, temperatures fall to highs of 2-10°C and lows -4-4°C, and snowfall becomes more regular, with wetter spells delivering up to 15 mm.
Through Carozzu, highs vary from 1-11°C and lows -6-5°C under mostly cloudy skies, with light precipitation generally below 5 mm. Reaching Asco Stagnu, highs range from -1-12°C and lows -8-4°C; snow episodes mix with drizzle or rain, and daily precipitation can reach about 14 mm, with occasional clear breaks.
At Tighettu, a colder pattern prevails, with highs -4-8°C and lows -9-0°C; snowfall is frequent and some days bring heavy precipitation up to 26 mm, though there are also dry windows. Ciottulu di i Mori is often the coldest stretch, with highs -8-6°C and lows -13 to -2°C, repeated snowfall, and peaks near 19 mm.
Conditions at Manganu run from highs -3-9°C and lows -9-3°C, mostly overcast with intermittent snow or drizzle, and totals usually light but occasionally near 11 mm. Petra Piana stays wintry, with highs -3-8°C and lows -11-1°C; precipitation varies widely, from dry spells to rare heavy surges near 70 mm amid snow and rain.
By Onda, highs swing between -2-11°C and lows -6-6°C, with frequent snowfall and heavy bursts up to 51 mm alternating with clearer intervals. Approaching Vizzavone, temperatures moderate to highs 2-16°C and lows -3-7°C, and conditions oscillate between overcast, light snow, and light rain, with daily totals up to 14 mm.
Capanelle registers highs -2-7°C and lows -11-2°C under frequent cloud, with snow and occasional rain delivering up to 23 mm. Prati trends colder, with highs -3-6°C and lows -13-1°C, mostly overcast with light drizzle or snowfall and maxima around 7 mm. Usciolu stays wintry with highs -3-7°C and lows -12-0°C; snow is recurrent and can total about 17 mm.
Matalza alternates drizzle, snow, and moderate rain, with highs 0-10°C, lows -11-0°C, and daily totals reaching 18 mm, alongside some clear spells. Asinau remains cold, with highs -4-10°C and lows -12-1°C; snowfall is common and precipitation can approach 13 mm.
I Paliri is variable, with highs -1-13°C and lows -11-4°C, mixed cloud and intermittent drizzle or snow, and daily amounts up to 13 mm. Descending toward Conca, temperatures lift to highs 5-17°C and lows 1-12°C; overcast and light drizzle are frequent, punctuated by moderate rain up to 18 mm and occasional clear breaks.
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