When to go · San Dimas
San Dimas in December
Avoid month. Listed as a month to avoid: Dec–Feb (waterpark closed, cool weather).
Key facts
- Verdict
- Avoid
- Temperature
- 19°C (66°F)66°F (19°C) / 7°C (45°F)45°F (7°C)
- average high / low
- Rain days
- 5
- Crowds
- High
- United States overall
- Prices
- High
- United States overall
Verdict
Listed as a month to avoid: Dec–Feb (waterpark closed, cool weather).
Is another month better than December?
December is rated avoid. These months rate higher:
Weather in December
- San DimasHighs around 19 °C (66 °F), lows around 7 °C (45 °F), rain on about 5 daysHighs around 66 °F (19 °C), lows around 45 °F (7 °C), rain on about 5 days
Festivals and holidays
Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.
Christmas Day big impact
25 Dec · United States
Most businesses closed; flights full from about 20 Dec to 2 Jan.
Crowds and prices
- Crowds · United States overall
- High
- Prices · United States overall
- High
United States overall: Holiday lights in New York, ski season opens; flights and hotels peak around Christmas and New Year.
High-price month: see what to book ahead.
Compare two months
Weather, crowds and prices for any two months in San Dimas, side by side.
Verdict
Dec: Avoid
Jun: Great (better)
Daytime high
Dec: 19 °C (66 °F)66 °F (19 °C)
Jun: 29 °C (84 °F)84 °F (29 °C)
Night low
Dec: 7 °C (45 °F)45 °F (7 °C)
Jun: 16 °C (61 °F)61 °F (16 °C)
Rain days
Dec: 5
Jun: 1 (better)
Crowds
Dec: High
Jun: High
Prices
Dec: High
Jun: High
Festivals listed
Dec: 1
Jun: 0
December: Listed as a month to avoid: Dec–Feb (waterpark closed, cool weather).
June: Inside San Dimas's best window: Jun–Sep (waterpark season).
San Dimas: figures are long-term averages from this guide, not a forecast.
What to pack
- A warm layer for the evenings