We are not finished with overnight lows in the 30's just yet. A blast of Canadian air filters in over Mother's Day weekend. On Sunday morning, the coldest air settles in with lows in the middle 30's.
A record low could be in jeopardy in Omaha but as of now The Weather Authority is forecasting a low of 37. The old record low of 33 was set in 1878. Even if the temperature sensor does not measure a reading below the freezing mark, low lying areas could dip that low. The standard height of a temperature sensor is 4 to 6 feet above the ground. Patchy frost could be a concern to some plant growers.
The beginning of the growing season has been slow to arrive to the central United States. As we move further into spring, more sites will see their last freeze. A late spring freeze can be particularly damaging if the growing season has begun and plants have emerged from the ground, which is especially true in a year like this that has been so warm during the early spring.
Most of the Heartland has already passed the average last freeze date but that doesn't mean a freeze is not possible.