In cold weather concrete practices, what defines cold weather conditions?

• A. Average daily temperature falls below 40 degrees for 3 consecutive days
• B. Average daily temperature falls below 50 degrees for 3 consecutive days
• C. Average daily temperature falls below 32 degrees for 2 consecutive days
• D. Average daily temperature falls below 60 degrees for 4 consecutive days

Answer: (A)

Cold weather conditions are defined by the average daily air temperature staying below 40°F for three consecutive days. This threshold matters because temperatures under 40°F slow hydration and increase the risk of early freezing before the concrete gains sufficient strength, so the exposure duration matters, not just a single cold day. A sustained three-day period below 40°F triggers cold-weather practices to protect the concrete, such as heating, insulation, and controlled curing. The other options don’t match this standard definition: while 32°F is freezing, two consecutive days below freezing don’t meet the three-day criterion; and 50°F or 60°F are above the cold-weather threshold, so they wouldn’t require those measures.