The station and its years of record
All the weather figures on this page come from NOAA's 1991–2020 climate normals for the Kalamazoo airport station. They're that station's normals, not measurements at your address. The annual precipitation normal rests on 20 years of record within 1991–2020, and the counts of wet days on 22 years.
NOAA's normals give 33.23 inches of precipitation in a normal year. The wettest months are October at 3.74 inches, May at 3.70 inches and August at 3.66 inches. A normal year brings 140.1 days with at least 0.01 inch, 69.2 days with at least 0.10 inch, 21.4 days with at least half an inch and 6.5 days with at least a full inch.
Why wet days matter more than wet inches
For an exterior paint job, a light drizzle can cost as much as a downpour. Paint needs a dry surface going on, and most labels also warn against rain until the coat has set. So the number that matters is how often the crew loses a day, not how much water falls. The station's count of days with any measurable precipitation is the better guide to how often a schedule may slip, and it is why exterior bids usually talk in weeks rather than fixed dates.
The day after rain
Wood siding and trim soak up water and give it back slowly. Even after the sky clears, the surface may be too wet for primer or paint. Shaded walls dry later than sunny ones. A painter may wait a day after a soaking before priming, and longer for bare wood. Ask how they decide a wall is dry enough; some use a moisture meter, some go by experience and the label.
Washing is wetting, too
Most exterior jobs start with a wash, which puts water on every wall. That drying time is part of the schedule, and pressure washing old wood can drive water deep. Ask:
- how the house will be washed and with what pressure;
- how long they'll wait after washing before scraping and priming;
- how they protect windows and the gaps around them during washing.
Wet months and booking
The station's wettest months, October, May and August, all fall in or at the edges of the season when most outside painting gets done. A sensible plan leaves room for lost days. Ask the painter how they handle a stretch of wet days in a booked job: do they move to another job and come back, or hold your slot?
A city of many houses
Census QuickFacts puts Kalamazoo city at 29,523 households, with 2.25 persons per household (2020–2024 figures). Spring and early summer requests for outside work tend to come in together everywhere, so it's worth getting proposals in hand before the season you want.
Painting and the state contractor license
Michigan's Occupational Code list of crafts and trades for a residential maintenance and alteration contractor license (MCL 339.2404) does not include painting and decorating; 2018 Public Act 527, effective March 28, 2019, removed that trade so residential painters no longer need that license. Put the schedule terms you agree on, including what happens on rain days, into the written proposal.
Our exterior painting page and pricing guide have more on preparation and cost.