The first tropical cyclone of the year was a
tropical disturbance in the South Pacific, which formed on January 2 over the
Solomon Islands. It was the first of 20 tropical cyclones in the South Pacific during the year,[57][58] including
Cyclone Donna, which became the strongest cyclone on record in the basin in the month of May, with 10 minute
sustained winds of 205 km/h (125 mph).[59] In the neighboring Australian basin, there were 28 tropical cyclones, most of them weak;[57][58] however,
Cyclone Ernie in April reached Category 5 intensity on the Australian tropical cyclone intensity scale, with 10 minute sustained winds of 220 km/h (140 mph).[60]Cyclone Debbie struck
Queensland in March, causing A$3.5 billion (US$2.67 billion) in damage and 14 deaths across Australia.[61][62] In November,
Cyclone Cempaka killed 41 people in Indonesia from heavy rainfall.[63] The south-west Indian Ocean was quiet, with only six tropical cyclones during the year.[57][58] Of these,
Cyclone Dineo in February killed at least 258 people when it moved through
Mozambique and
Zimbabwe.[64][65]Cyclone Enawo struck Madagascar in March, killing 78 people.[66] There was also a
subtropical cyclone –
Guará – which formed off Brazil in December.[67]
In the northern hemisphere, activity began on January 7, when a
tropical depression formed and later moved across the Philippines, killing 11 people.[68] It was the first of 41 tropical cyclones in the western Pacific Ocean in the year.[69] The final two storms of the season –
Kai-tak and
Tembin – moved through the Philippines in December, together causing 406 deaths.[64] The year's costliest typhoon was
Hato, which left more than US$4.34 billion in damage when it moved ashore southern
China near
Hong Kong.[70] In the north Indian Ocean, there were 10 tropical cyclones, which included several deadly storms.
Cyclone Ockhi in December killed more than 137 people in
Sri Lanka and southern
India.[69][71] There were 20 tropical cyclones in the eastern Pacific Ocean, including
Tropical Storm Lidia, which killed 20 people when it struck western Mexico.[69][72]
In the Atlantic Ocean, activity began in April and lasted until November, with 18 tropical cyclones,[69] including several deadly and costly storms. In August,
Hurricane Harvey struck southeastern
Texas and subsequently stalled over the state, dropping 60.58 in (1,539 mm) of rainfall; this was the highest amount of precipitation associated with a tropical cyclone in the United States. The rains caused widespread flooding along the storm's path, particularly near
Houston, resulting in more than 100 fatalities and US$125 billion in damage, tying Harvey with
Hurricane Katrina in 2005 as the costliest United States hurricane.[73] In September,
Hurricane Irma struck the northern
Lesser Antilles and later
Cuba as a Category 5 hurricane, and later
Florida at a lower intensity, causing more than US$50 billion in damage and 139 deaths.[74] Two weeks after Irma,
Hurricane Maria struck
Dominica as a Category 5 hurricane and later
Puerto Rico as a Category 4 hurricane, causing US$90 billion in damage and more than 3,000 deaths, mostly in Puerto Rico.[75][76][77] Also during the season,
Hurricane Nate produced damaging floods across Central America, killing 45 people.[78]
This is a timeline of weather events during
2017. Please note that entries might cross between months, however, all entries are listed by the month they started.
January 21–24 –
A tornado outbreak, windstorm, and nor'easter, across the
Southeastern and
Northeastern United States and
Quebec, killed 22 people (20 tornadic and 2 non-tornadic), injured 204 others, and caused $1.3 billion (2017 USD) in damage from 81 tornadoes, becoming the second-largest January tornado outbreak and the third-largest winter tornado outbreak since 1950 as well as the largest outbreak on record in Georgia. The outbreak was also the second-deadliest outbreak in January since 1950.[19]
February 23-24 - Record heat surges into the Northeastern United States. On February 24,
New York City sees a February record warm low of 58 °F (14 °C).[82]Boston saw a record monthly high of 73 °F (23 °C).[83]Albany, which hit 74 °F (23 °C), saw its warmest temperature in meteorological winter on record.[84] The day before,
Syracuse tied a monthly record high, at 69 °F (21 °C).[85]
March 9–18 –
A blizzard across North America, unofficially named Winter Storm Stella, Blizzard Eugene, and Blizzard of 2017, killed 16-19 people and caused over 100,000 power outages. The storm system also spawned three tornadoes in Florida and wind gusts of 138 mph (222 km/h) were reported on
Mount Washington, New Hampshire.[10]
April
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adding to it. (September 2022)
August 6 –
Four tornadoes around
Tulsa,
Oklahoma injured 30 people and caused $50.24 million (2017 USD) in damage.
August 17 – September 2 –
Hurricane Harvey kills 103 people due to extreme flooding in
Texas. It also kills one in
Guyana, two in
Arkansas, one in
Tennessee and one in
Kentucky. Overall it causes 108 deaths and $125 billion in damages, tying it with
Hurricane Katrina as the costliest hurricane.
September 16-30 -
Hurricane Maria makes landfall in the Windward Islands and Puerto Rico, killing 3,059 and causing $91.6 billion in damages.
September 25-27 -
Syracuse, New York experienced its latest in-year heat wave, with temperatures hitting 90 °F (32 °C) on September 25 and 27 and 91 °F (33 °C) on September 26.[89]
October 28-31 - A
storm complex causes $100 million and 1.3 million power outages.[64][15]
November
This section is empty. You can help by
adding to it. (September 2022)
December
December 23, 2017 – January 19, 2018 – A
cold wave caused damaging low temperatures across eastern
North America. The cold wave also caused
Tallahassee, Florida to receive trace amounts of frozen precipitation for the first time in more than 30 years.
^Eric S. Blake; David A. Zelinsky (January 23, 2018).
Hurricane Harvey (AL092017)(PDF) (Report). Tropical Cyclone Report. Miami, Florida:
National Hurricane Center.
Archived(PDF) from the original on January 26, 2018. Retrieved January 29, 2018.
^John P. Cangialosi; Andrew S. Latto; Robbie J. Berg (March 9, 2018).
Hurricane Irma (AL112017)(PDF) (Report). Tropical Cyclone Report. National Hurricane Center.
Archived(PDF) from the original on August 31, 2018. Retrieved March 12, 2018.
^Richard J. Pasch; Andrew B. Penny; Robbie Berg (April 5, 2018).
Tropical Cyclone Report: Hurricane Maria(PDF) (Report). Miami, Florida: National Hurricane Center.
Archived(PDF) from the original on April 20, 2018. Retrieved April 10, 2018.
^John L. Beven II and Robbie Berg (April 5, 2018).
Tropical Cyclone Report: Hurricane Nate(PDF) (Report). Miami, Florida: National Hurricane Center.
Archived(PDF) from the original on April 10, 2018. Retrieved April 10, 2018.