What is the Boiling Point of Water Charts giving the boiling point of water vs altitude are based on the standard atmosphere and can be quite misleading. If the barometric pressure is different from the standard atmosphere, the actual boiling point of water will vary from that given in the charts. For example: If you live in Denver and wish to calibrate your thermometer using boiling water as the standard, the charts will tell you the boiling point of water in Denver is 202°F. If on that day the barometric pressure in Denver is 30.05 inHg, the correct boiling point for water is 212+°F. If your thermometer indicates 212° in boiling water, you will believe it to be 10° high. This means that if you are cooking a chicken to an internal temperature of 170°F in the breast, you will actually overcook by 10°, scratch your head, and wonder why is was dry when you did everything right. A more reliable way to determine the correct boiling point of water, at a specific time, is to use the calculator below. Just enter the current barometric pressure, in inches of mercury (inHg), and click on "Do Boiling Point Calculation". The correct boiling will be returned in the lower window. You can visit The Weather Channel and enter your ZIP code to determine you current barometric pressure. Your Current Local Barometric Pressure inHg ie: 30.2 The boiling point of water is °F

Now that you know the temperature that water will boil - now what do you do? The dome thermometers Primo sells are adjustable. Calibrate the thermometer. Avoid using the retaining clip or make sure you leave it loose because if you turn the dial with the clip firmly holding the thermometer - it will turn the dial and not the probe and you will now be out of calibration and it could be very far out. Boil a small amount of water on the stove Insert the tip of the dome thermometer in the water, but do not let it touch the pan bottom. When the temp has stopped rising on the dial - compare it to what water is suppose to boil at based on the temp from the barometric pressure above. Using a small crescent wrench, turn the adjustment nut while holding the dial firmly. You may wish to do this with the tip out of the water - it normally takes only a small amount of a turn. Recheck in the boiling water and readjust as needed.