- Weather
Local Weatherrelated sub items
Weather Forecastrelated sub items
Weather Warningsrelated sub items
Weather for Fishermen
Weather for Marinerelated sub items
Weather for Aviation
Weather Monitoring Imageryrelated sub items
GIS Weather Servicerelated sub items
Tropical Cyclone
China Weatherrelated sub items
World Weatherrelated sub items
- Climate
- Geophysics
- Astronomy
and Time - Radiation
Monitoring - Community
- Learning
Educational Resources
360 Tour of HKO- This link will open in a new window
My Little Observatory - This link will open in a new window
Decoding Radiation - This link will open in a new window
A Tour of Tropical Cyclones - This link will open in a new window
Cloud Appreciation by Dr Tin - This link will open in a new window
International Cloud Atlas 
Guided Tour
Courses and Activities for the Public
Subscription of e-Bulletins
Research Forum
Publications
- International &
Regional Cooperation- World Meteorological Organizationrelated sub items
- International Civil Aviation Organizationrelated sub items
International Atomic Energy Agency- This link will open in a new window
Regional Specialized Meteorological Centre for nowcasting - This link will open in a new window
South China Sea Tsunami Advisory Center 
Asian Aviation Meteorological Center
Partners
- Media
and News
Social Mediarelated sub items
Press Releases
What's New
HKO Updates
LegCo Questions and Answers
Weather Chit Chat
Observatory's Blog
Weather On-Air- This link will open in a new window
Cool Met Stuff - This link will open in a new window
Central Briefing 
Tropical Cyclone Report Broadcast- This link will open in a new window
Observatory's News 
Vacancies
Tender Notices
- e-Services
- About Us
- About Hong Kong Observatory
- This link will open in a new window
HKO Corporate Video 
Vision and Mission- Performance Pledges
Organizational Structure
Quality Management
Hong Kong Observatory – The Facts
Hong Kong Observatory 2023
Our Services
Programme Areas of the Observatory
History of the Hong Kong Observatory
Career@HKO
Visitors Figures- This link will open in a new window
Hong Kong Observatory Open Day 2025
Earthquakes
Tide
Geomagnetism
Space Weather
Weather Information for Astronomical Observation
Interactive Sun Path Diagram
Astronomical Data
Interesting Astronomical Phenomena
Time Services
Calendar
AlmanacHistory
- Weather
- Local Weatherrelated sub items
- Weather Forecastrelated sub items
- Weather Warningsrelated sub items
- Weather for Fishermen
- Weather for Marinerelated sub items
- Weather for Aviation
- Weather Monitoring Imageryrelated sub items
- GIS Weather Servicerelated sub items
- Tropical Cyclone
- China Weatherrelated sub items
- World Weatherrelated sub items
- Climate of Hong Kong
Climate Information Service
Warnings & Signals Database
Statistics of Special Weather Events
Monthly Weather Summary- Climate Forecastrelated sub items
Climate Changerelated sub items
El Nino and La Nina
- Radiation Monitoring
Real time Radiation level in Hong Kong
Understanding Radiation
Radiation Monitoring, Assessment and Protection
Environmental Radiation Monitoring Programme
Daya Bay Contingency Plan- Related Sitesrelated sub items
Schools
Travelrelated sub items
Sportsrelated sub items
Outdoor Photography
CWOSrelated sub items
Senior Citizens
Stargazers
FoOb- This link will open in a new windowCo-Win
- This link will open in a new windowMy Little Observatory
Interactive Map of Storm Damage by Mangkhut
- Educational Resources
- 360 Tour of HKO
- This link will open in a new windowMy Little Observatory
- This link will open in a new windowDecoding Radiation
- This link will open in a new windowA Tour of Tropical Cyclones
- This link will open in a new windowCloud Appreciation by Dr Tin
- This link will open in a new windowInternational Cloud Atlas
- Guided Tour
- Courses and Activities for the Public
- Subscription of e-Bulletins
- Research Forum
- Publications
- International & Regional Cooperation
- World Meteorological Organizationrelated sub items
- International Civil Aviation Organizationrelated sub items
- International Atomic Energy Agency
- This link will open in a new windowRegional Specialized Meteorological Centre for nowcasting
- This link will open in a new windowSouth China Sea Tsunami Advisory Center
- Asian Aviation Meteorological Center
- Partners
- Social Mediarelated sub items
- Press Releases
- What's New
- HKO Updates
- LegCo Questions and Answers
- Weather Chit Chat
- Observatory's Blog
- Weather On-Air
- This link will open in a new windowCool Met Stuff
- This link will open in a new windowCentral Briefing
- Tropical Cyclone Report Broadcast
- This link will open in a new windowObservatory's News
- Vacancies
- Tender Notices
Appsrelated sub items- This link will open in a new window
Personalized Website 
Weather Wizard
Weather Information in Text- This link will open in a new window
Weather Information in RSS 
Audio Web Page
Forms
Open Data
- About Hong Kong Observatory
- This link will open in a new windowHKO Corporate Video
- Vision and Mission
- Performance Pledges
- Organizational Structure
- Quality Management
- Hong Kong Observatory – The Facts
- Hong Kong Observatory 2023
- Our Services
- Programme Areas of the Observatory
- History of the Hong Kong Observatory
- Career@HKO
- Visitors Figures
- This link will open in a new windowHong Kong Observatory Open Day 2025
Personalized Website
- This link will open in a new window個人版網站
- This link will open in a new window个人版网站
- This link will open in a new windowPersonalized Website
- This link will open in a new windowSitus Web Khusus
- This link will open in a new windowव्यैक्तिक वेबसाइट
- This link will open in a new windowव्यक्तिकृत वेबसाइट
- This link will open in a new windowਵਿਅਕਤੀਗਤ ਰੂਪ ਦਿੱਤੀ ਵੈੱਬਸਾਈਟ
- This link will open in a new windowNa-personalize na Website
- This link will open in a new windowเว็บไซต์ส่วนบุคคล
- This link will open in a new windowذاتی بنائی ویب سائٹ
- This link will open in a new windowTrang web chuyên dùng
Search
>- Climate>
- Climate Information Service>
- Climatological Normals and Extremes>
- Monthly Normals of Relative Humidity at Different Geopotential Heights at 00 UTC (1961-1990)
© 2024 Hong Kong Observatory
|
Last Revision Date: 28 November 2019