monthly climate summary

In defiance of spring, Mother Nature slipped right into summer during May, and broke a major record in doing so. Based on preliminary data from the Oklahoma Mesonet, the month finished as the warmest on record with a statewide average of 74.6 degrees, 6.4 degrees above normal. The previous record of 74 degrees was set back in 1962. This abrupt transition was especially jarring coming directly after the second coolest April on record. The heat was unkind to those battling severe drought conditions, but sporadic heavy rains did lend improvements to some.

Wildfires rolled across the Oklahoma prairie for two weeks in April, scorching hundreds of thousands of acres and placing entire towns in jeopardy. The fires came on the heels of more than six months of drought in which western Oklahoma received virtually no significant precipitation. Vegetation that had seen abundant growth during 2017 lay dormant or dead, awaiting a spark. Weather conditions coalesced on the 12th and 17th to produce fire danger labeled “historic.” As feared, fires roared to life on the 12th, driven to a frenzy on winds gusting to over 50 mph.

Drought continued to punish western Oklahoma throughout March, even as eastern sections saw additional relief. Similar to February, Interstate 44 served as a rough demarcation line between the above normal totals to the southeast and paltry offerings to the northwest. The news was dire for northwestern Oklahoma, where precipitation deficits that began in early October 2017 strengthened drought impacts. Fire danger rose to critical levels almost daily.

February rain records were shattered as a series of storm systems during the month’s final week brought snow, sleet and heavy rains to Oklahoma. The unsettled weather dumped a season’s worth of moisture over the southeastern half of the state and provided a brief brush with wintry weather. Kids across the state finally enjoyed a snow day or two as slippery travel shut down schools. The Oklahoma Mesonet site at Broken Bow led the state with an astounding 17.65 inches of rainfall, the highest total ever recorded in Oklahoma during February.

The dry weather that plagued Oklahoma through the final three months of 2017 showed no signs of letting up during the first month of 2018. The lack of precipitation was especially prominent across western Oklahoma where 19 of the Oklahoma Mesonet’s 120 stations received no precipitation for the month, and another 47 saw less than a quarter-inch. In some cases, the precipitation-free streak extended back to early October. The Mesonet sites at Woodward and Hooker had gone 113 consecutive days without a single drop of moisture by the end of January.

Oklahoma’s seemingly endless supply of mild weather came to an abrupt halt during the third week of December, ushering in a frigid end to a warm 2017. A bulge in the jet stream allowed frosty air to plunge southward and place most of the country into an arctic deep freeze. Oklahoma’s introduction to the cold air came on Dec. 21 and lasted through the end of the year. Highs in the 60s and even a few 70s were common during the first three weeks of December, topped by a high of 83 degrees at three Mesonet sites in southwest Oklahoma on the fourth.

Drought flourished across Oklahoma over the past month, fed by one of the state’s driest and warmest Novembers on record. Six of the Oklahoma Mesonet’s 120 stations recorded no precipitation for the month, and another 77 recorded a quarter of an inch or less. High temperatures rose into the 70s and 80s with regularity. The temperature at the Altus and Mangum Mesonet sites soared to 94 degrees on the 17th, the second highest November temperature on record in Oklahoma, dating back to 1892. It was also the highest temperature ever recorded in the state that late in the calendar year.

October’s weather was highly variable, and a bit too exciting at times as is usually the case during this transition period from summer to winter. Temperatures ranged from the teens to the 90s and rainfall totals fluctuated from double-digits to less than a quarter-inch. Flurries in the Panhandle as early as Oct. 11 brought the state its first snow of the season, although the sleds remained stored in the attic. The last of several cold fronts during the month provided trick-or-treaters with a chilly and sometimes damp search for candy.

Hot and dry weather dominated Oklahoma’s weather headlines for much of September, a drastic change from the extraordinarily mild and wet August the state had just experienced. Many wondered if fall’s premiere would wait until October, but those fears were soon alleviated with the arrival of a strong storm system during the month’s final week. High temperatures in the 50s and 60s along with generous rainfall amounts of 2-4 inches provided a pleasant burst of autumn for much of the state and a welcome bout of moisture for Oklahoma’s wheat farmers.

August is often Oklahoma’s most brutal summer month. The spring rains become a distant memory, heat gains momentum through July, and the state’s landscape turns a sickly shade of yellow. With drought intensifying along with the heat this summer, August looked bleak once again. However, Mother Nature was in a charitable mood. The upper-level heat dome – a common visitor to the Southern Plains in late summer – shifted to the west and brought Oklahoma under northwesterly flow aloft.