With little variation in year-round daily temperature, Honolulu has been ranked No. 1 in the U.S. when it comes to the most predictable weather.

SaveOnEnergy.com, an energy-comparison website based in Texas, recently ranked 185 American cities for how predictable their weather was in 2016 by breaking down temperature, precipitation, wind and snowfall.

Honolulu’s temperature typically varies from 68 degrees to 87 degrees over the course of a year and is rarely below 63 degrees or above 89 degrees.

“The variation in temperature is probably the most impressive factor of this Hawaiian paradise, with the average temperature 78 degrees,” SaveOnEnergy.com wrote on its website. “Sunny days are a common occurrence with the sun shining 69 percent of the time and although it precipitates 154 days a year on average, the total rainfall is 17 inches on average.”

Honolulu topped the list of most predictable weather cities, ranking ahead of nine cities in California: Oxnard, Chula Vista, Salinas, San Diego, Thousand Oaks, San Francisco, Irvine, Torrance and Huntington Beach.

Honolulu’s ranking is no surprise to National Weather Service meteorologist Derek Wroe, who said Honolulu’s weather is highly regulated by relatively steady ocean temperatures and moderated by tradewinds for much of the year.

“This is the tropics, and in the U.S. Honolulu is the only city in the tropics,” Wroe said. “There are no large swings in temperature like there are in most places on the mainland.”

Topping the list at the other end of the scale — the country’s most unpredictable weather cities — was Sioux Falls, S.D.

“While (Sioux Falls) typically fluctuates between lows of 6 degrees and highs of 85 degrees, on occasion it can drop below -13 degrees and rise above 95 degrees,” SaveOnEnergy.com said. “It also had variable winds and precipitation which edged it almost a full tenth of a point over second place.”

Sioux Falls beat out nine other cities with unpredictable weather, all in the Upper Midwest: Minneapolis, St. Paul, Minn.; Omaha, Neb.; Des Moines, Iowa; Madison, Wis.; Lincoln, Neb.; Cedar Rapids, Iowa; Rockford, Ill.; and Chicago.

Temperature carried the most weight in the rankings, accounting for 50 percent of the grade, followed by rain, snow and wind. In calculating its rankings, SaveOnEnergy.com averaged the temperature readings and weather in both 2011 and 2016.

How moderate is the climate in Honolulu?

For most folks, there are only two seasons: summer between May and October and winter between October and April.

Contributing to temperate climate in Hawaii, according to the Western Regional Climate Center, is the fact that the length of day is relatively uniform throughout the year. Uniform day lengths translate into smaller seasonal variations in solar radiation and ultimately temperature.

Another contributing factor, according to the National Weather Service, is Hawaii’s remote location — more than 2,000 miles from the nearest continent. No matter how cold or hot the air is initially, it will have moderated by the time it reaches Hawaii.

In fact, winter arctic air may experience a 100-degree temperature rise while it passes over the waters of the North Pacific, according to the “Atlas of Hawaii” by former state climatologist Saul Price.

As for rain, urban Honolulu is located on the relatively dry leeward side of Oahu. And while the crest of the Windward Koolau mountains may average more than 200 inches a year, the city might see 20 inches a year, Wroe said.