An inch or less of snow lightly dusted parts of Long Island on Sunday, but meteorologists are already tracking a system that could bring a “significant” amount of snow and rain on Friday and Saturday.

In an otherwise unusually warm season, National Weather Service meteorologists said Sunday that parts of Long Island and the New York City received an inch or less of snow throughout the afternoon. Wantagh received 1.3 inches of snow, and Islip received an inch, according to the service.

December’s average of 48 degrees was 12 degrees higher than usual. And while the average snowfall for January is 9 inches at Long Island MacArthur Airport in Ronkonkoma, meteorologists said, the Island has seen just traces of powder in the past two months.

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“Virtually a snowless winter,” said Kevin Kacan, a meteorologist with the service’s office in Upton. “We’re way below how much snow we’re supposed to have.”

That may change by the end of the week, depending on a developing storm system now over the Pacific Ocean, said Peter Wichrowski, another weather service meteorologist. The system could arrive in the region late Friday night into Saturday, with the potential to bring “significant snowfall,” he said.

“Right now as we speak, it’s got a long way to go,” Wichrowski said. “We’re looking at a system that hasn’t even moved across the West Coast yet. . . . At this time, it’s still uncertain. Anything at this point would be tough to nail down this far out. . . . It’s just a matter of what happens after it crosses the Rockies.”

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Monday will have highs in the upper 20s and lows in the midteens. It will be a mostly sunny day with another chance of snow showers throughout most of the daylight hours, the weather service said.

“Tuesday’s another cold day — it will be sunny — with highs in the upper 20s and lows around 20,” said meteorologist Faye Barthold. “Monday and Tuesday will both be windy days.”

Look for highs in the mid-30s for Wednesday, when a sunny day is predicted, and lows in the mid-20s.

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Mostly sunny skies and a few clouds are ahead for Thursday, when highs will again be in the mid-30s and lows dip to the mid-20s.

More of the same in the way of temperatures continues for the start of the weekend on Friday, when highs will be in the mid-30s and lows in the mid-20s.

With Laura Figueroa