April on the GR 20 is unsettled. Lower elevations are often mild, with daytime highs in the mid-teens to around 20°C and
cooler nights, while the ridge and passes remain cold with sub-zero nights and occasional daytime temperatures near
freezing. Showers and periods of rain are frequent, sometimes delivering 20 to 35 mm in a day, interspersed with clear,
sunny spells. Snowfall is still possible on the high sections, and cloud cover swings quickly between overcast and
bright breaks.
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From Calenzana, April brings changeable skies: overcast spells, drizzle, and bursts of rain punctuate brighter intervals, with highs roughly 13 to 20°C and nights mostly 6 to 16°C. Climbing to Ortu and Carozzu, temperatures drop sharply; highs often sit between 3 and 15°C with lows down to -9°C, and several days see snowfall, including heavy falls. At Asco Stagnu the mood stays volatile, with episodes of moderate to heavy rain around 23 to 35 mm and one heavy-snow day amid occasional clear windows.
Across Tighettu and Ciottulu di i Mori the pattern alternates between dry breaks and showery periods, with highs from 1 to 15°C and lows between -8 and 5°C. Snow flurries recur on colder days, while milder days turn to drizzle or light rain. Reaching Manganu, variability persists: a heavy-snow day occurs alongside many dry or mainly clear days, with highs spanning 0 to 18°C and lows down to -7°C.
At Petra Piana, wintry pulses linger with light snow at times, sub-zero nights that dip to about -10°C, and occasional drizzle, but milder sunny days can reach 16°C. Onda mixes dry, bright spells with showery interludes and the odd moderate rain day near 11 mm, with highs from 5 to 19°C. Around Vizzavone, conditions range widely between 8 and 21°C, including one heavy-snowfall day and several dry, clear spells punctuated by light to moderate rain up to about 10 mm.
From Capanelle to Prati, skies lean overcast with frequent drizzle and occasional moderate rain around 12 to 13 mm. Highs run 3 to 15°C, lows often near or below 0°C, and Prati still sees light snowfall on some days. Clear breaks do appear between systems.
Through Usciolu and Matalza the mix continues: scattered showers and light rain alternate with mainly clear intervals. A heavy-snowfall event can still hit Usciolu, while temperatures vary from highs of 2 to 16°C to lows around -4 to 5°C. Most days stay on the drier side here.
Approaching Asinau, the wettest burst of the month reaches roughly 29 mm, and a snow day crops up amid otherwise dry to partly cloudy periods; temperatures lie between 5 and 16°C with lows -3 to 7°C. I Paliri trends milder with many dry or lightly showery days and highs up to 21°C. Conca finishes mostly dry with occasional drizzle, highs 15 to 22°C, and mild nights of 6 to 13°C.
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