2,651°F (1,455°C)

So water can freeze when surrounded by air at 32 degrees if there is a wind chill factor. This is why it is possible to survive in freezing temperatures with no wind, but if there is a wind you will suffer hypothermia.

-50 degree celsius is more colder than -23 degree celsius. That’s why -50°C is colder than -23°C.

Temperature

32 °F

Wouldn’t temperatures have to be near freezing? The answer is YES; in order for frost to form. the temperature must be at 32 degrees or below. Closer to the ground, however, temperatures can fall several degrees lower, sometimes as much as 10 degrees!

It’s not just the temperature but the length of time that temperatures are at or below freezing that damages plants. Light freeze – 29° to 32° Fahrenheit will kill tender plants. Moderate freeze – 25° to 28° Fahrenheit is widely destructive to most vegetation.

A local study done on frost formation relating temperature to dew point has these guidelines for frost: temperatures from 38 to 42 F can lead to patchy frost, 33 to 37 areas of frost, and 32 and below widespread frost/freeze.

It can result in a loss of feeling and color in affected areas before you even realize how dangerous it’s gotten. Wind chills of 20 to 40 below zero are possible through Thursday morning. At those temperatures, it can take less than 10 minutes to develop frostbite on any exposed skin.

During the morning hours, frost can begin to form with temperatures as warm as 37 degrees. If it’s 37 degrees at 5-10 feet above ground, it is almost always colder down at ground-level. That can cause frost to form car windows, grass, and slightly-elevated surfaces that have dipped to the 32-degree mark.

When it is 10 C or higher at night the plants can be left outside, and they will begin to develop a tolerance to the outdoor temperatures.

Mums do not respond well to frosts and freezes, which may not occur until December or January in warmer areas. If you don’t want your mums to suffer damage, you can protect them by moving them to a sheltered area such a garage or porch if they are potted.

In gardening terms, a “light freeze” or “light frost” refers to temperatures that fall just a few degrees below freezing for a few hours. A “hard frost” or “killing frost” comes when the temperature drops further, below 28 degrees, for a longer time. It will kill the top growth of most perennials and root crops.

Houseplants need to be taken indoors before overnight temperatures dip below 45 degrees Fahrenheit. Most tropical plants suffer harm from temperatures below 40 degrees.

A 40°F (or 4.444°C) temperature isn’t fatal to tomato plants. So, yes, your tomato plants will survive at 40°F temperature. In fact, tomato plants can survive temperatures down to 33 degrees Fahrenheit (or 0.5556°C). However, that doesn’t mean the plants will bloom and fruit optimally.

Tomatoes’ Temperature Range Although mature plants might survive light frosts, temperatures below 40 F damage flower and fruit production, making tomatoes perennial only in U.S. Department of Agriculture zones 12 and up. Above 95 F, the flowers abort and will not produce fruit.

Warm-Season Annuals The plants, typically summer- or early fall-blooming species, can sometimes survive night temperatures in the 40 to 50 F range. To ensure survival, it is a good idea to protect the newly planted specimens with plastic or fleece if night temperatures fall between 32 to 45 F.

Temperature Thresholds According to Protabase, geraniums grow well in the temperature range of 65 to 95 degrees F during the growing season, and in the winter low temperatures between 40 to 50 degrees F, according to the “A-Z Encyclopedia of Garden Plants.”

Although impatiens thrive in Mediterranean climates, they typically prefer shaded temperatures of around 65 to 70 degrees Fahrenheit. Impatiens may die if the thermometer dips below 32 F.

Tender annuals, also called true annuals, have no tolerance for frost and must be planted in the spring when nighttime temperatures are above 55 degrees, when all danger of frost is past. Half-hardy annual flowers can survive brief, light frosts and temperatures of 35 degrees to 45 degrees.

When cold comes, remember to protect your plants from frost Cold weather, even if it doesn’t drop below freezing, can harm cold-sensitive plants. Freezes are rare, but frosts can occur at above-freezing temperatures. Even temperatures at 45 degrees for more than several hours can harm some tropical orchids.

Your beautiful, flowering, summer annuals are likely to die when temperatures dip to 32 degrees Fahrenheit and lower. One of your best defenses against frost and freezes is to plant your tender annuals after the last expected spring frost.

Indoor Geraniums and Temperature The ideal temperature for growing geraniums indoors is 65 to 70 F during the day and 55 F at night. If you bring your pots indoors after the temperature drops below 45 F, the warmth may shock them, turning their leaves yellow and causing them to drop.