Climate Chart of Washington D.C., USA

Monthly data: Temperature °C, Rain (mm), Sunshine (h) · 2013–2023

Climate overview

Temperature

The warmest monthly mean temperature occurs in July, at 26.0 °C; this describes the monthly average, not the daytime high on any particular day. At the cooler end, January has a monthly mean of 1.9 °C. The unweighted mean of the monthly temperature means is 14.1 °C, a broad summary that does not represent every month equally by its number of days or describe day-to-day swings.

Rain

Mean daily rainfall is highest in July, at 5.36 mm/day, and lowest in January, at 1.90 mm/day. These are average daily amounts for the respective months, not monthly rainfall totals; they also do not reveal how often rain falls or whether any particular day will be wet. The unweighted mean of the monthly daily-rainfall means is 3.42 mm/day, useful as an overall reference but not a forecast.

Sunshine

Mean daily sunshine reaches 11.41 hours/day in July, while December records the lowest monthly mean, 5.47 hours/day. The unweighted mean across the monthly sunshine means is 8.37 hours/day per day. These figures describe average sunshine duration, not daylight length, and cannot guarantee how sunny a specific day will be.

Snow

Mean daily snowfall is highest in January, at 4.47 mm/day; the unweighted mean across monthly daily-snowfall means is 1.14 mm/day. These averages do not establish the number of snowy days, snow depth, or how long snow remains on the ground, so they should not be taken as evidence of dependable snow cover or particular snow conditions.

Best Travel Time Guide for Washington D.C., USA: Ideal Seasons and Weather Insights

If you prioritise cooler monthly average temperatures, January is the relevant option in these data, with a monthly mean of 1.9 °C; this is not a daytime maximum and does not describe the range of conditions on individual days. For lower average rainfall, January has the lowest mean daily amount, 1.90 mm/day, but that does not guarantee dry weather or indicate rain frequency. For rain preparation, note that the highest mean daily rainfall is in July, at 5.36 mm/day. The average is not a forecast for your dates, so checking conditions close to travel and packing for changeable weather remain sensible whichever month you choose.

Visitors planning outdoor sightseeing around average sunshine may find July useful to consider, when mean daily sunshine is 11.41 hours/day; December has the lowest mean, 5.47 hours/day. Sunshine duration is not the same as day length and cannot promise clear skies on a particular day, so treat these as planning context rather than a guarantee. Snowfall averages are also limited as a travel guide: the highest mean daily snowfall is in January, at 4.47 mm/day, but that figure does not establish snowy-day frequency, accumulation, or snow cover. It should not be used on its own to plan around snow-dependent activities.

Climate Data Overview for Washington D.C., USA

Explore the comprehensive climate data for Washington D.C., USA. This detailed table provides valuable insights into temperature variations, precipitation levels, and seasonal changes, helping you understand the unique weather patterns of this region.

• See also climate change in Washington D.C.
• Explore the climate in USA