Weather in Washington in January

The month to avoid. January is the month most people should skip in Washington. Highs sit at 4.8 °C and the day is short; this is an indoors-with-excursions month, not an outdoors-all-day one.

January ranks 12 of 12 — near the bottom of Washington's year. October is the month that works, and the swing between the two is 51 points, which is a different holiday rather than a slightly better one.

Rain on 8 days, 2 of them heavy. Enough to need a plan B, not enough to need a plan around it. Layers, and a genuinely waterproof outer — at 4.8 °C the difference between a good day and a miserable one is entirely down to what you are wearing.

What the averages hide

Averages flatten a month, and this one hides a few things: 24 nights drop below freezing, so anything left outside stays frozen. Across the twenty years measured, the hottest January day reached 21 °C and the coldest night fell to -16.1 °C, and the wettest single day dropped 48 mm — roughly 72% of the month's rain in one day.

January is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest January on record still delivered 95 mm against 37 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 67 mm average is a reasonable planning figure, not a promise.

Wind is light at 11.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 82%, which at 4.8 °C means damp rather than muggy — the kind of cold that gets into a coat and stays there.

How January sits in the year

This is a turning point in the year — December and February sit on opposite sides of it, so the month contains the change rather than following it.

Daylight in January

January sits at the dark end of Washington's year — 9.7 hours of daylight against 14.9 at midsummer, gaining 0.7 hours across the month. Sightseeing days are genuinely shorter, and an itinerary built for summer will not fit.

An inland climate

With no coast nearby, the year swings a fair way — 34.4 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

How busy it gets

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

January in Washington versus nearby

If Washington is one option among several, the nearby comparison is worth making. Richmond is the weaker option in January — within a degree on temperature, 12 days more rain. Philadelphia is close enough to be a coin toss — within a degree on temperature, 1 day more rain.

So: January is a compromise. October is 51 points better and is what Washington is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Washington

See all twelve months in Washington, or where else to go in January.