A “good temp” depends entirely on what you’re measuring. The most common contexts are body temperature, room temperature for comfort and sleep, cooking safety, and a few household appliances. Here’s a quick, practical guide to the ideal temperature ranges that matter most in daily life.
Normal Body Temperature
The old standard of 98.6°F (37°C) is still generally accepted as the average, but normal body temperature actually spans a range of 97°F to 99°F (36.1°C to 37.2°C). Your temperature fluctuates throughout the day, running lower in the morning and higher in the late afternoon. Age, activity level, and even the menstrual cycle can shift it.
A fever starts at 100.4°F (38°C) when measured orally, rectally, or with an ear thermometer. Armpit readings run a bit lower, so anything at or above 99°F (37.2°C) in the armpit counts as a fever. In adults, fevers of 103°F (39.4°C) or higher are considered serious. For babies under three months old, any fever at all warrants immediate medical attention.
Best Temperature for Sleep
Your bedroom should be between 60°F and 67°F (15°C to 19°C) for the best sleep quality. That range helps stabilize REM sleep, the phase most tied to memory and mental recovery. It feels cool, and that’s the point: your core body temperature naturally drops at night, and a cooler room supports that process rather than fighting it. Think of your bedroom as a cave, as Cleveland Clinic sleep researchers put it. A room that’s too warm leads to more restless nights and more frequent wake-ups.
Thermostat Settings for Home Comfort
In winter, the U.S. Department of Energy recommends setting your thermostat to 68°F to 70°F while you’re awake and lowering it while you sleep or leave the house. Dropping it 7 to 10 degrees for eight hours a day can cut your annual heating and cooling costs by about 10%.
In summer, set your air conditioning as high as you can comfortably tolerate when you’re home, and let the house warm up when you’re away. One common mistake: cranking the thermostat way down when you turn on the AC. It won’t cool the house any faster. It just runs longer and costs more.
Safe Cooking Temperatures
Undercooked meat is one of the easiest ways to get food poisoning. These are the minimum internal temperatures for safety, measured with a meat thermometer in the thickest part:
- Beef, pork, lamb, and veal (steaks, roasts, chops): 145°F (63°C), then let it rest for 3 minutes before cutting
- Ground meat (beef, pork, lamb): 160°F (71°C)
- All poultry (chicken, turkey, duck, whole or ground): 165°F (74°C)
The 3-minute rest for whole cuts isn’t optional. The internal temperature continues rising slightly during that time, which finishes off harmful bacteria near the surface. Ground meat needs a higher temperature because bacteria get mixed throughout during grinding. Poultry requires the highest temperature of all because of the particular risks from salmonella and other pathogens common in raw chicken and turkey.
Refrigerator and Freezer Settings
Your refrigerator should be at or below 40°F (4°C). Your freezer should be at 0°F (-18°C). Above these thresholds, bacteria multiply quickly. Most fridges have a built-in thermometer, but a cheap standalone one is worth having since the dial settings on older models can drift. If you’ve had a power outage, a full freezer will hold its temperature for about 48 hours if you keep the door shut.
Water Heater Temperature
The U.S. Consumer Product Safety Commission recommends setting your water heater to 120°F (49°C). This is hot enough for comfortable showers and effective cleaning, but reduces the risk of scald burns, especially for children and elderly household members. The danger from hotter water is real and faster than most people expect: water at 150°F causes third-degree burns in just two seconds. At 140°F, it takes six seconds. Even at 120°F, a five-minute exposure to the skin can cause serious burns, so the lower setting buys critical reaction time.
Pool and Bath Water
Recreational swimming pools typically range from 78°F to 82°F (26°C to 28°C). The American Red Cross recommends 78°F for competitive swimming, though young children and older adults are generally more comfortable at 80°F or above. For a baby’s bath, the water should feel warm but not hot when you test it with your elbow or wrist, which is more sensitive to heat than your hand. Most pediatric guidelines suggest around 100°F (38°C) for infant baths.