monthly climate summary

Known as the state’s most active severe weather month, May tried to live up to that moniker with several extended periods of threatening weather. Although it didn’t quite match some of the more ferocious Mays since the beginning of the decade, it was still quite lively nonetheless. At least one instance of severe weather was reported somewhere in the state on 16 of the 24 days between May 8 and May 31. The National Weather Service published a preliminary count of 19 tornadoes during May, four short of average for the month.

Fears of the strengthening drought and associated wildfire danger, so prevalent through the first three months of the year, lasted about a week into April before Mother Nature unleashed spring on Oklahoma. Flooding, gigantic hail, severe winds and a final week filled with the threat of tornadoes were all in the offing during the month. The drought was quenched in most parts of the state by repeated storm systems. According to preliminary data from the Oklahoma Mesonet, the robust moisture propelled April to rank as the seventh wettest on record, dating back to 1895.

The dry weather that had plagued the state during the first two months of 2016 continued during March. Drought conditions spread across nearly all of northwestern Oklahoma and aided the massive Anderson Creek wildfire that burned 367,620 acres across Woods County in Oklahoma and the adjacent counties in southern Kansas. The total acreage burned in Oklahoma amounted to 88,082, all within Woods County. The fire, whipped by winds of over 60 mph, began on March 22 near Camp Houston in Woods County before quickly spreading to the north and then east.

A warm, windy and dry February, plagued by wildfires, served as a fitting epitaph for a winter that largely failed to materialize. According to preliminary data from the Oklahoma Mesonet, the month ended more than 5 degrees above normal to rank as the ninth warmest February since records began in 1895. That propelled the climatological winter, December through February, to the fourth warmest on record at nearly 4 degrees above normal.

Considering the extreme precipitation that ended 2015, and with the “super” El Niño that boosted the November-December period to the wettest on record for the state still in place, January was a veritable dud. According to preliminary data from the Oklahoma Mesonet, the statewide average precipitation total was 0.71 inches, nearly an inch below normal and the 28th driest January since records began in 1895. Only 29 of the Mesonet’s 120 stations recorded at least an inch of rain, and only three exceeded 2 inches. Cloudy led all Mesonet sites with 2.45 inches.

Mother Nature managed to save some of the worst of 2015’s weather for last, ending the year with a powerful winter storm that, while significant for western Oklahoma, was historic for the eastern half of the state. The Dec. 26-28 event prompted blizzard, ice storm and winter storm warnings for western Oklahoma while the eastern half was awash in flood-related emergencies. High winds accompanied the storm throughout its stay. The Oklahoma Mesonet recorded 984 wind gusts of at least 50 mph from 10 p.m. on Dec. 26 through 4:15 a.m. on Dec. 28.

Records were threatened, tornadoes were spotted, and ice crippled half of the state while the other half flooded, all thanks to two powerful storm systems during one of the wildest stretches of November weather in state history. The first system struck around mid-month and resembled a classic springtime severe weather setup. A series of supercells sprung up across the High Plains and marched east, dropping as many as five tornadoes in Oklahoma and many more across Texas and Kansas.

It took a bit of convincing, but Mother Nature finally gave the okay for fall to arrive during the final week of October. That change in seasons took the state from a warm, dry pattern that had persisted for the past three months to much more seasonable and rainy weather. Two successive storm systems at the end of the month brought heavy rains to much of southern and western Oklahoma, halting the advance of the flash drought that began during the heat of August. Those areas saw between 3-7 inches of rain, and in some areas of south central Oklahoma, more than 9 inches of moisture fell.

Flash drought continued to spread across southern Oklahoma during a dry, hot September, and had enveloped nearly 17 percent of the state by month’s end. According to preliminary data from the Oklahoma Mesonet, the statewide average rainfall total was 1.43 inches below normal at 2.1 inches, the 33rd driest September since records began in 1895. It was particularly dry across south central and southeastern Oklahoma, areas that had seen record rainfall from April through July.

Many a rainy summer has stared into the unyielding gaze of August and faltered. Coming off the wettest May-July period on record for Oklahoma, this August was met with similar expectations. In that regard, however, it was an unmitigated failure with preliminary data from the Oklahoma Mesonet indicating a statewide average of 2.3 inches. That is more than half an inch below normal and ranks the month as the 46th driest August on record, dating back to 1895. The northeast saw a surplus of more than 1.7 inches to rank as the 24th wettest August for that area.