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Roofline JournalFresno · Central Valley
Seasonal

Seasonal Fresno Roof Maintenance

A season-by-season checklist built around the valley climate: long hot summers, a short rainy season and winter tule fog.

By the Roofline Journal editorial desk · Reviewed · 5 min read

Short answerPrepare the roof in fall (clean gutters, check flashing, trim branches), watch it during winter storms, inspect for damage in spring, and in summer focus on heat-related wear and attic ventilation. Do ground-level checks yourself and leave steep or high roof work to professionals.

The valley roof year

National Weather Service climate records for Fresno show a sharply seasonal pattern: little to no rain from late spring through early fall, then a rainy season that usually runs from about November to April. Dense valley fog (tule fog) is common in December and January. Each season stresses a roof differently.

The Central Valley roof year: most rain falls between late fall and early spring, while summer brings long stretches of intense heat and sun.

Fall: get ready for rain (Sept–Nov)

  • Clean gutters and flush downspouts (gutter guide).
  • From the ground with binoculars, look for missing, cracked or lifted shingles.
  • Check flashing at chimneys, skylights, vents and walls for gaps or rust.
  • Trim branches back from the roof; this also removes rodent bridges.
  • Look at fascia and soffits for peeling paint or soft spots (fascia guide).
  • Book any repairs now, before contractors are busy with storm calls.

Winter: rain and fog (Dec–Feb)

  • During a heavy rain, walk around the house: note overflowing gutters and where water lands.
  • Check ceilings and the attic for stains after storms.
  • Clear leaves again after the last trees drop them.
  • Watch for moss or algae on shaded, fog-damp slopes.
  • Listen for attic noises; winter is when rodents seek shelter (entry points).

Spring: inspect the damage (Mar–May)

  • Look over the roof after the rainy season ends; note any storm damage.
  • Check gutters for heavy granule buildup, a sign of aging shingles.
  • Consider a professional inspection every few years, or after a major storm.
  • Plan repair, rejuvenation or replacement before summer (decision guide).

Summer: heat and UV (Jun–Aug)

  • Check attic ventilation is clear and working (vent guide).
  • Inspect sealant at gutters, flashing and penetrations; heat dries it out.
  • Avoid walking on shingles in midday heat; softened shingles damage easily.
  • If you're re-roofing, ask about cool roof products.

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Sources

  1. National Weather Service, Hanford/San Joaquin Valley office: NOWData climate records for Fresno and the valley
  2. National Weather Service: Hanford, CA forecast office (San Joaquin Valley)
  3. InterNACHI: How to Perform a Roof Inspection
  4. U.S. EPA: Using Cool Roofs to Reduce Heat Islands
  5. OSHA: Fall Protection