Weather in Denver in January

A hard month. January asks something of you. Go in knowing what. Highs sit at 8.4 °C and the day is short; this is an indoors-with-excursions month, not an outdoors-all-day one.

January ranks 9 of 12 in Denver: past the worst of the year but short of October, which is the month to book if the dates are open.

Rain falls on only 5 days, so an itinerary with no wet-weather fallback is a reasonable risk. Layers, and a genuinely waterproof outer — at 8.4 °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 21.1 °C and the coldest night fell to -17.1 °C.

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 35 mm against 6 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 17 mm average is a reasonable planning figure, not a promise.

Wind is light at 10.1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 55%.

How January sits in the year

Temperatures hold steady either side: 7.9 °C in December, 8.4 here, 9 in February. Nothing about the timing within the month matters much.

Daylight in January

January sits at the dark end of Denver's year — 9.6 hours of daylight against 15 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 — 37 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage. At 1609 m, altitude is doing as much work here as latitude: thinner air means fierce sun by day and heat that leaves the moment it sets.

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 Denver versus nearby

If Denver is one option among several, the nearby comparison is worth making. Aspen is the weaker option in January — 9.3 °C cooler, 5 days more rain. Moab is close enough to be a coin toss — within a degree on temperature, 1 day more rain.

So: January is a compromise. October is 41 points better and is what Denver 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 Denver

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