|Early Season Nor'easter
||An early season snow storm broke records in several locations, including New York City?s Central Park, where 2.9 inches of snow fell. The highest snowfall amounts were further inland, with more than 30 inches accumulating in western Massachusetts and southern New Hampshire.
||October National Report
|Extremes in CONUS PDSI
||USCEI extremes in PDSI (Palmer Drought Severity Index) covered a record 56% of the CONUS (32% wet PDSI and about 24% dry PDSI). Numerous cities across the Midwest and Northeast broke annual precipitation records. Conversely, a number of locations in the southern plains experienced a record dry annual period.
||November Drought Report
||Perhaps the most powerful storm to affect Alaska's Bering Sea coast since the early 1970s. Wind gusts were measured at 89 mph, storm surge up to 7 feet high with 35 foot waves.
||November National Report
|Groundhogs Day Blizzard
||January 31 - February 2, 2011
||At least 5 inches of snow fell across 22 states with 1-2 feet of snow covering a large area across OK, KS, IA, MO, IL, WI, IN, MI and into New England. Chicago reported its 3rd largest snowfall with 20.2 inches reported at O'Hare Airport, which was also the biggest snowstorm on record for the month of February.
||Regional Snowfall Index
||Despite cool temperatures across the Northwest Region, summer was the 2nd warmest on record for the CONUS with the bulk of the warmth occurring across the Deep South and extending from the Southeast into the Northeast. A large number of 100 degrees F days occurred across a much of the South.
||Summer National Report
|Winter Snowfall Records
||Winter (December 2010 - February 2011) & Snow Season (July 2010 - June 2011)
||During the winter season, many locations across the Midwest and Northern Plains broke snow fall records.
||Winter Snow and Ice Report
||July 5, 2011
||A very large and historic dust storm moved through a large swath of Arizona during the late afternoon and evening hours of July 5, 2011. Widespread reports of near zero visibility and winds gusting over 50 MPH (80 kph). It is estimated that this dust storm reached heights of 6000 ft.
||NWS Phoenix Report
|Extremes in CONUS 1-Day Precipitation
||Spring (Mar - May)
||USCEI extremes in 1-day precipitation reached a record high with approximately 16% of the CONUS impacted.
||USCEI Spring 1-Day Precipitation
|Northeast Snowfall Records
||January - February
||Several locations, including New York?s City?s Central Park and Philadelphia, were affected by major snowstorms which ranked in the top ten in history. Combined with the earlier snowstorms, January was the snowiest on record in New York, Newark, Bridgeport, and Hartford.
||NESIS Snowfall Map
|Santa Ana Winds
||November - December
||A powerful Santa Ana windstorm whipped through mountain passes and canyons across the West and Southwest beginning on November 30 and continuing into December.
||NCDC November National ReportNOAA Viz Lab Graphic
|Oklahoma Extreme February
||Within the span of two days, two statewide records fell: 24-hour snowfall (2011, in the wake of snow associated with the Groundhog's Day blizzard, snow-packed Nowata, Oklahoma recorded a low temperature of -31 degrees F, breaking a record first established 84 years earlier. By the end of the week, temperatures had reached the 80s in much of the state. Bartlesville experienced a seven-day temperature swing of 110 degrees F (from -28 degrees F to 82 degrees F).
||All-time Climate Extremes for Oklahoma"
|Dew Point Depression Record
||June 27, 2011
||The temperature in Las Vegas reached 107 degrees F with a dew point temperature of -22 degrees F, the driest air on record for the city. The difference between the two yields a dew point depression of 129 degrees F and a relative humidity of 0.6%.
||June National Report