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When to go · Cheonan

Cheonan in January

Avoid month. Listed as a month to avoid: Jul–Aug (monsoon rain, 280–300 mm a month), Dec–Feb (lows below freezing).

Key facts

Verdict
Avoid
Temperature
3°C (37°F) / −7°C (19°F)
average high / low
Rain days
5
Crowds
Low
South Korea overall
Prices
Low
South Korea overall

Verdict

AvoidBest and avoid months for Cheonan

Listed as a month to avoid: Jul–Aug (monsoon rain, 280–300 mm a month), Dec–Feb (lows below freezing).

Is another month better than January?

January is rated avoid. These months rate higher:

Weather in January

Long-term averages
  • CheonanHighs around 3 °C (37 °F), lows around -7.5 °C (19 °F), 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.

  • Seollal (Lunar New Year) big impact

    About 5–8 Feb 2027 (lunar; incl. substitute day — check) · South Korea

    Three-plus days off: many restaurants and shops close, trains and buses sold out, palaces open (often free), Seoul quiet.

Crowds and prices

Crowds · South Korea overall
Low
Prices · South Korea overall
Low

South Korea overall: Cold and dry, low prices; ski in Gangwon; Seollal can fall late in the month — check.

Compare two months

Weather, crowds and prices for any two months in Cheonan, side by side.

  • Verdict

    Jan: Avoid

    Apr: Great (better)

  • Daytime high

    Jan: 3 °C (37 °F)

    Apr: 18.7 °C (66 °F)

  • Night low

    Jan: -7.5 °C (19 °F)

    Apr: 4.9 °C (41 °F)

  • Rain days

    Jan: 5 (better)

    Apr: 7

  • Crowds

    Jan: Low

    Apr: High

  • Prices

    Jan: Low

    Apr: High

  • Festivals listed

    Jan: 1

    Apr: 0

January: Listed as a month to avoid: Jul–Aug (monsoon rain, 280–300 mm a month), Dec–Feb (lows below freezing).

April: Inside Cheonan's best window: Apr–Jun, Sep–Nov.

Cheonan: figures are long-term averages from this guide, not a forecast.

What to pack

  • A warm coat, hat and gloves for mornings and evenings

Build the full packing list for your trip →

Across South Korea in January →