100-degree temperatures: Predictions, myths about Valley's warm-up

PHOENIX - It's only a matter of time before we hit the first 100-degree day here in the Valley.

But when exactly will it strike? ABC15's seven-day forecast predicts we'll hit triple-digits on Monday, but we could even see 100-degree temps this weekend.

Over the past 30 years, the average first day of 100-degree weather is May 2, according to National Weather Service statistics.

We're already a month past the record for earliest triple-digit temperatures — that happened March 26, 1988.

The latest 100-degree day happened all the way back on June 18, 1913, but we definitely won't have to wait that long, according to Chief Meteorologist Amber Sullins.

Last year, we passed triple-digits on April 21, with a record-tying 103-degree high.

Regardless of the exact date this year, now is a great time to clear up some myths about extreme heat in the Valley.

1. An early first 100-degree day doesn't always mean we'll have a hotter-than-usual summer.

Amber says, earlier triple-digit temps can't be used to predict an extra-hot summer. However, long-range forecast models are showing above-average temperatures for most of the summer.

2. 100-degree weather doesn't necessarily mean pollen season is over, but it's a good sign.

While tree pollination season typically ends by summer, grass tends to pollinate in late spring and into summer, according to the Asthma and Allergy Foundation of America.

Weather.com's four-day Pollen Cast still shows "very high" levels of grass pollen through the weekend.

Amber says most pollens die down once we see a good stretch of 100-degree temps, but not all of them.

3. Grabbing a sports drink isn't always the best way to beat the heat.

While staying hydrated is a must in 100-degree weather, sports drinks are primarily made for athletes who require the electrolytes in sports drinks.

The average person doesn't need as many electrolytes, clinical nutritionist Diane Radler told ABC News, and the added sugar in the drinks isn't good for your health. It's best to stick to cold water.

4. Leaving a fan on when no one is home won't keep a room cool.

Fans cool your skin by circulating air through a room and moving it across your body, according to the Department of Energy. This makes you feel cooler while the temperature in the room stays the same.

If you run the fan while nobody's home, you're just wasting energy.

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