A month by month cleaning plan for Henderson, built from the airport's climate normals and the valley's dust, monsoon and smoke records rather than a spring cleaning checklist written for a rainy climate.
Most seasonal cleaning advice assumes a wet spring, a muddy fall and a snowy winter. Henderson has none of those. Its year runs from a mild, sunny winter through a dry and windy spring, a long stretch of triple-digit heat, a short and sometimes violent monsoon, and a fall that feels like relief. Each phase leaves something different behind in a house.
This calendar uses the 1991 to 2020 normals from Las Vegas Harry Reid Airport, the closest official station, plus Clark County air quality records, to suggest what to clean and when.
The airport averages just 4.18 inches of rain a year. It records about 78.2 days at or above 100 degrees, and July's normal high is 104.5 with a normal low near 82. Winter is short and mild, with about 9.8 freezing nights and 0.2 inches of snow in a normal year, and December, the coolest month, still has a normal high of 56.9.
Two things interrupt that pattern. The North American Monsoon can bring thunderstorms, higher humidity and flash floods in July and August. And wind or wildfire can fill the valley with particles: county records list high-wind dust events on May 28 to 29, 2022 and July 31, 2023, and a wildfire episode on August 18 to 21, 2020. A good calendar plans around both.
Henderson's winter is when people live outside. With December's normal high near 57 degrees and freezing nights rare, patios and yards get steady use, and entry floors pay for it. Gravel, decomposed granite and fine dirt ride in on shoes and paws.
This is also the most comfortable time of year for big indoor projects, because the air conditioning is off and the house can be aired out on mild afternoons.
Spring is windy and getting drier by the week. May averages only 0.07 inches of rain, and May 28 to 29, 2022 is on the county's list of high-wind dust events. Windy days push fine dust through door gaps and around window frames, and it settles on sills and blinds within hours.
Late spring is also the moment to get the house ready to be shut for summer. Once the heat sets in, the doors stay closed and whatever dust is inside gets recirculated for months.
June averages only 0.04 inches of rain, and average relative humidity sits around 16.5 percent. Very dry air keeps fine particles floating longer, which is why dust seems to reappear on dark furniture a day after it was wiped. Static also rises in dry air, so dust clings to screens and electronics.
Damp microfiber works better than a dry duster in June: it holds the dust instead of lifting it back into the room. Keep bathroom and kitchen surfaces wiped dry too, since evaporation is fast and hard water leaves its mark wherever it dries.
These are the hardest months on a house. July 2024 was the hottest month ever recorded in Las Vegas, with a mean daily temperature of 99.9 degrees. The house stays sealed and full, so kitchens and floors need more frequent attention, and many households move to weekly visits for these weeks.
When the monsoon shows up, it can bring storms, brief downpours and flash flooding. The National Weather Service in Las Vegas issues Dust Storm Warnings and Flash Flood Warnings for Clark County. After a storm, expect mud at the entries, grit in sliding door tracks and a film on outdoor-facing sills.
Smoke can drift in during fire season as well. The Southern Nevada Health District advises keeping doors and windows closed, keeping the air conditioner filter clean, and not vacuuming while smoke is high, because it stirs up the particles already inside. Wait for the air to clear, then wipe surfaces with a damp cloth before vacuuming.
As temperatures ease, the house can breathe again, and it is the natural time to undo summer. A deep clean in early fall clears the dust that recirculated for months, the grit the monsoon left in tracks and the film on fans and vents.
It is also a good moment to look at the yard. The Southern Nevada Health District notes that West Nile virus has been present in Clark County since 2004 and refers neglected green swimming pools to local code enforcement as mosquito breeding sources. Standing water near the house brings mosquitoes indoors, so keep pools treated and drain saucers and buckets.
The questions Henderson homeowners ask most often about this topic, answered plainly.
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