top of page

Newsroom

PRESS RELEASE

New CRA Meteorological Analysis Shows Heat Season Extends 214 Days per City

London/Lagos, 3 July, 2025 — As global temperatures rise, many cities and communities are reeling from the impacts of extreme heat. A new analysis of global cities by Climate Resilience for All’s meteorological team led by Dr. Larry Kalkstein found that on average, that heat season extends for 214 days per city—with extremely hot days happening anytime within that period.

The study evaluated the last five years of meteorological data (2019-2023) from regional and national meteorological services to assess how long the heat seasons extend in 85 cities in all climate zones worldwide, excluding humidity. The analysis identified the earliest and latest day that reached 90°F/32°C at each location during this five-year period - showing the extent of the temperature thresholds in each city.

This analysis further revealed that:

  • Heat seasons are not confined to the recognized summer seasons and are much longer in duration.

  • 20 of the 85 cities analyzed can have extremely hot days anytime during the year. Tropical cities such as Bangkok, Manila, Singapore and Rio de Janeiro face near year-round heat seasons where 90°F/32°C days can occur anytime during the year.

  • Mid-latitude locations such as New York, Melbourne, Berlin, and Buenos Aires have varying lengths of these periods of high temperatures. 

  • The Southern Hemisphere locations such as Dhaka, New Delhi, and Cairo show that extremely hot temperatures are likely early and late in the year.

 

Urban heat is driven by a warming climate, “the heat island effect”, caused by densely built infrastructure and limited green space and rapid urban migration that concentrates people and development in cities.

“Extreme heat is taking a growing and significant toll on people’s health, causing illness and death, disrupting infrastructure, tourism, and work productivity, and straining healthcare systems—among many other impacts.

Cities never designed for heat now face new heat shocks and stresses. Yet, the planning and response measures for heat are either nonexistent or woefully inadequate for the scale of this crisis,” said Kathy Baughman McLeod, CEO of Climate Resilience for All.

“This analysis makes it clear: we can no longer treat heat as just a normal part of summer. The ‘summer season’ many of us once knew is gone. It is imperative that we mainstream awareness and understanding of extreme heat, so that governments, businesses, and employers manage their risks and impacts with the urgency these conditions demand,” added Baughman Mcleod.

A global NGO operating in seven countries, Climate Resilience for All is focused on protecting women and vulnerable communities from extreme heat. CRA has extensive expertise on both the impacts and the solutions to extreme heat. 

 

ENDS 

CONTACTS:

Geraldine Henrich-Koenis, geraldine@climateresilience.org

Kelechukwu Iruoma, kelechukwu@climateresilience.org

Lengths of 1st and Last Hot Days Recorded by Region and City (first and last day of 90°F/32°C temperatures)

City
Country
First
Last
Season Length
Hassi Messaoud
Algeria
Jan-09
Nov-07
303
Cairo
Egypt
Jan-21
Dec-03
317
Agadir
Morocco
Feb-02
Nov-28
300
Timbuktu
Mali
Jan-01
Dec-31
365
Navrongo
Ghana
Jan-01
Dec-31
365
Lagos
Nigeria
Jul-01
Sep-27
278
Luanda
Angola
May-29
Oct-13
168
Conakry
Guinea
Jun-10
Sep-23
261
Cape Town
South Africa
May-16
Nov-15
181
Bloemfontein
South Africa
Mar-21
Sep-27
176
Nairobi
Kenya
Jul-15
Mar-15
123
Zarafshan
Uzbekistan
Apr-13
Sep-26
167
Astana
Kazakhstan
May-24
Sep-06
106
Yakutsk
Russia
Jun-21
Jul-29
39
Ulaanbaatar
Mongolia
May-15
Aug-15
93
Mexico City
Mexico
Apr-17
Jun-19
64
Bogotá
Colombia
Apr-08
Aug-29
144
Monterrey
Mexico
Jan-30
Nov-27
302
Manaus
Brazil
Jan-01
Dec-31
365
Rio de Janeiro
Brazil
Jan-01
Dec-31
365
San Salvador
El Salvador
Jan-01
Dec-31
365
Merida
Mexico
Jan-01
Dec-31
365
Asunción
Paraguay
Jan-01
Dec-31
365
Buenos Aires
Argentina
Oct-28
Mar-14
137
Campina Grande
Brazil
Sep-22
Mar-27
187
Shanghai
China
Apr-11
Oct-03
176
Beijing
China
May-01
Sep-08
131
Yinchuan
China
Jun-24
Aug-02
35
Seoul
Korea
Jun-19
Sep-20
94
Tokyo
Japan
Jun-16
Sep-22
99
Hong Kong
China
Apr-15
Oct-15
184
London
England
Jul-18
Aug-13
27
Moscow
Russia
Jun-22
Jul-14
23
Madrid
Spain
May-19
Sep-14
119
Athens
Greece
May-17
Oct-08
145
Lisbon
Portugal
May-27
Oct-09
136
Paris
France
Jun-16
Sep-16
93
Munich
Germany
Jun-19
Aug-22
35
Tiranë
Albania
May-15
Oct-04
143
Warsaw
Poland
Jun-22
Aug-18
58
Stockholm
Sweden
0
Abadan
Iran
Mar-18
Nov-13
241
Mount Arafat
Saudi Arabia
Feb-22
Nov-26
278
Dubai
United Arab Emirates
Feb-14
Nov-29
289
Amman
Jordan
Apr-07
Oct-28
205
Riyadh
Saudi Arabia
Feb-16
Nov-27
285
Jahra
Kuwait
Mar-11
Nov-22
257
Baghdad
Iraq
Apr-01
Nov-02
216
Tehran
Iran
Apr-15
Oct-15
184
Palm Springs
USA
Mar-15
Dec-01
262
Los Angeles
USA
May-20
Oct-19
171
New York
USA
Jun-05
Aug-29
86
Dallas
USA
Apr-01
Oct-18
201
Orlando
USA
Mar-12
Oct-21
224
Las Vegas
USA
Apr-09
Oct-15
190
Washington DC
USA
May-22
Sep-06
108
Ottawa
Canada
May-27
Aug-25
91
Winnipeg
Canada
Jun-04
Sep-02
91
Vancouver
Canada
0
Yellowknife
Canada
0
Juneau
USA
0
Darwin
Australia
Jan-01
Dec-31
365
Port Moresby
Papua New Guinea
Jan-01
Dec-31
365
Perth
Australia
Apr-26
Sep-27
212
Sydney
Australia
Mar-21
Sep-16
187
Alice Springs
Australia
May-14
Aug-23
265
Brisbane
Australia
Mar-09
Oct-24
137
Honolulu
USA
Jun-01
Nov-09
162
Auckland
New Zealand
0
Melbourne
Australia
Oct-15
Apr-15
183
Cocos (Keeling) Islands
Australia
Dec-15
Nov-15
32
Sindh
Pakistan
Feb-10
Nov-26
290
Bangkok
Thailand
Jan-01
Dec-31
365
Phnom Penh
Cambodia
Jan-01
Dec-31
365
Jakarta
Indonesia
Jan-01
Dec-31
365
Singapore
Singapore
Jan-01
Dec-31
365
Manila
Philippines
Jan-01
Dec-31
365
Tha Ngon
Laos
Jan-01
Dec-31
365
Colombo
Sri Lanka
Jan-01
Dec-31
365
Mumbai
India
Jul-22
Sep-05
291
Hyderabad
India
Jan-14
Oct-13
273
Dhaka
Bangladesh
Feb-23
Nov-03
254
Hanoi
Vietnam
Mar-10
Nov-12
248
Delhi
India
Jan-15
Dec-15
335
Kathmandu
Nepal
Apr-15
Sep-15
154

contact us

Thank you for contacting us!

Cape Town, South Africa
Washington, D.C. 
  • Instagram
  • LinkedIn
  • Facebook
  • Youtube
bottom of page