January on the Wicklow Way feels cold and often grey. Cloud dominates much of the month, with frequent light rain or drizzle and the odd heavier spell. On higher ground, sleet or snow can appear, and brief wintry showers may reach lower levels during colder snaps. There are occasional brighter breaks, but they tend to be short. Wind varies, at times brisk on exposed ridges, then easing during calm, frosty interludes.
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Starting from the city edge into the Dublin Mountains toward Knockree, days are mostly overcast with frequent light drizzle or patchy rain. Colder bursts bring sleety or light snow showers, especially as you gain height, with occasional icy starts. Brief clear gaps do occur, but they seldom last before cloud fills back in.
Continuing toward Roundwood, the upland crossings feel a touch harsher: low cloud clings to the hills and showers drift through. When milder Atlantic air arrives, rain can turn more persistent; when colder air returns, snow showers are possible on the tops and occasionally lower. Sunshine is limited to short windows between bands of cloud.
In the Glendalough valleys, expect long dull spells with light rain or drizzle, punctuated by occasional heavier pulses. Higher passes can carry sleet or wet snow during cold snaps, with hill fog common. Some stretches turn dry but remain grey and cool. Winds are often more noticeable on exposed saddles, easing in the sheltered woods.
South from Glenmalure toward Moyne, the pattern swings between showery intervals and longer wet periods tied to passing fronts. Temperatures sit in a wintry band from near freezing at night to the high single digits Celsius by day, with brief milder spikes possible. Wintry showers can still crop up, though many days are simply damp and overcast.
Across the lower hills into Shillelagh, conditions moderate slightly, with more breaks between showers and the odd brighter spell. Still, cloud is dominant and light rain or drizzle remains common. A brief cold surge can reintroduce sleet or wet snow, mainly overnight or on higher patches.
On the final run to Clonegal, the weather trends a little gentler but stays changeable. Overcast skies are frequent, with light rain returning at intervals and only short-lived sunny spells. Any wintry flakes are less frequent here, but the air stays chilly.
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