Seasonality Of Disasters (US)

NOAA Billion dollar disasters: https://www.ncdc.noaa.gov/billions/

Flooding

Peak flooding is June and July:

We are quickly approaching the most active time of year for flash flooding. About 75% of flash flood reports are typically received between late April and mid September. For flood safety information, visit: https://t.co/1nvXNFtL1N pic.twitter.com/T1auGdBzLE

— NWS Weather Prediction Center (@NWSWPC) April 12, 2018

Hurricanes

Peak hurricane season is September and usually runs 1 June to 30 November:

NOAA

Tornadoes

Tornado season usually refers to the time of year the U.S. sees the most tornadoes. The peak “tornado season” for the southern Plains (e.g., Texas, Oklahoma, and Kansas) is from May into early June. On the Gulf coast, it is earlier in the spring. In the northern Plains and upper Midwest (North and South Dakota, Nebraska, Iowa, Minnesota), tornado season is in June or July. But, remember, tornadoes can happen at any time of year. Tornadoes can also happen at any time of day or night, but most tornadoes occur between 4–9 p.m.

NOAA

Note that Tornados can extend into southern Canada. Information on fatality trends here.

More tornado stats by NOAA here

Information on Tornado Alley via NOAA.

Tornado Alley via Severe Weather

There is a “second season” of tornadoes in September thru October.

October tornadoes via ustornadoes.com

Blizzards

via AMS

Blizzards have been reported in all months except July, August, and September. Monthly blizzard occurrence highlighted a more active blizzard season (December, January, February, and March; Fig. 6) and a less active blizzard period during the transitional seasons (October, November, April, and May; Fig. 7). 

via AMS

via AMS

Wildfires (US)

Regional Fire Seasonality

• Alaska
• Northwest
• Northern California
• Southern California
• Southwest
• Great Basin
• Northern/Central Rockies and Great Plains
• Great Lakes and Northeast
• Southeast

via NWCG