From the Fort Collins Coloradoan (Bobby Magill):
Total monthly rainfall in Fort Collins was .06 inches – 4.3 percent of normal – making last month the seventh-driest September on record. The last year it was so dry in September was in 1992, when only .02 inches of rain fell that month. The culprit for all the dry weather was a giant high pressure over the Rockies, shunting storms well to the north, said Colorado State Climatologist Nolan Doesken.
Particularly unusual, he said, were wide temperature swings between day and night. Some mornings, he said, the temperature here dipped to below 40 degrees, but the daytime temperatures were in the 80s…
The region’s reservoirs are well above normal for this time of year, he said, with Horsetooth Reservoir at two-thirds capacity and Lake Granby nearly full. Lake Granby filled completely this year, something that hasn’t occurred since 1999, [Brian Werner from the Northern Colorado Water Conservancy District] said. There’s so much water in the region’s water supply system that “even with a below-average runoff and snowpack next year, we’re still going to be in good shape,” Werner said.