Williams (AZ) Temperature by Month

The average annual maximum temperature in Williams, Arizona, United States of America is 17°C (63°F), with daytime highs ranging from 7°C (45°F) in December to 28°C (82°F) in July. This page covers monthly averages, day-night differences, and how Williams compares to cities worldwide.

In Williams, temperatures can shift dramatically between warm in summer and cold in winter. Nights follow the same pattern, with lows ranging from 13°C (55°F) in July to -6°C (21°F) in December.

The chart below illustrates the average maximum day and minimum night temperatures in Williams by month:

From around 4 AM to 6 AM temperatures are at their lowest; by 3 PM they've climbed to their daily peak.

The chart below shows the average temperature throughout the year:

Williams's average annual maximum temperature is 17°C (63°F). To put that in context, here's how it compares to a few well-known destinations:

Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.

Reykjavík, Iceland averages 9°C (48°F) a year, mild summers by Icelandic standards, but cold winters and frequent wind.

Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.

Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained, so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.

For more on Williams's weather, including monthly rainfall, sunshine hours, and humidity, visit our Williams climate page.