Screen Printing in Diamond Bar, CA
Diamond Bar is about 8 miles southwest of Merch Mob's shop in Montclair, CA, a straight-line distance. Under-18s are 19% of Diamond Bar and the median age is 45.7 (Census ACS, 2020-2024), so expect adult size runs, often weighted toward medium to XL, with youth sizes as an occasional add-on.
Diamond Bar by the numbers
Diamond Bar has 51,884 residents, 6% fewer than in 2020 (Census estimates). Los Angeles County as a whole has 9,694,934 residents, down 3.2% since 2020.
Los Angeles County counts 8,214 full-service restaurants, 41 sports teams and clubs, 516 event promoters (performing arts, sports and similar events) and 87 breweries with paid employees (Census County Business Patterns 2023). Restaurants and Bars · Sports Teams · Events · Breweries
Diamond Bar shares the shop's Pacific time zone.
- Population, 2025
- 51,884
- Since 2020
- −6%
- County
- Los Angeles County
- Median age
- 45.7 (US 38.9)
- Residents under 18
- 19% (US 22%)
- From the shop
- 8 mi southwest
- USPS zone from the shop
- 1
- Warmest month, average high
- August, 96°F
- Coldest month, average low
- December, 40°F
- Days at 90°F or hotter, a year
- 99
- Nights at 32°F or colder, a year
- 11
- Rain, a year
- 10 in
Weather: Chino Airport station, 11 mi from Diamond Bar's center (NOAA 1991-2020 Climate Normals). People: Census ACS 2020-2024. Population: Census, July 2025. Counts: CBP 2023, by county.
Screen printing through Diamond Bar's year
Diamond Bar logs about 99 days a year at 90°F or more, and August highs average 96°F, so lightweight tees and tanks are the natural base for most screen print runs. No month averages a high under 65°F, but December lows fall to an average of 40°F, so a midweight hoodie run for winter evenings is worth adding next to the tees. Average highs stay at 70°F or above for 11 months of the year, so a tee design has no real off-season, and a restock can follow the original spec sheet so it matches the first run. Expect about 23 days a year at 100°F or above, which favors soft ring-spun tees over stiffer open-end cotton; the smoother ring-spun surface also holds fine lines and halftones cleanly. At about 10 inches of rain a year, short-sleeve runs can be planned for nearly any month, with sun and heat, not rain, deciding the blank.
Diamond Bar's weather figures come from the same NOAA stations as Corona's (Chino Airport), so the month-by-month table is on the Corona page.
Screen Printing for Diamond Bar
Screen printing pages for nearby cities: Pomona (5 mi).
From the production floor
Merch Mob production in Montclair, CA.
Screen Printing in Diamond Bar
Should a screen print order in Diamond Bar go on tees or hoodies?
Tees, nearly all year. Short sleeves carry the program in Diamond Bar, where even the coolest month, December, averages a high of 69°F, and a small hoodie run is enough for cool evenings. The under-18 share is below the US figure, so adult sizes will make up most of the run, and a youth version of the print is only needed when a school or team asks.
How far is Diamond Bar from the shop?
Diamond Bar is about 8 miles southwest of Merch Mob's shop in Montclair, CA, a straight-line distance. From the shop's ZIP code, it is USPS zone 1. Orders ship; there is no pickup.
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Tell us what you are making. The quote comes back within 24 hours, from Merch Mob's shop about 8 miles away from Diamond Bar.