International organisation

World Meteorological Organization

The weather agency. An observation network is only as good as its least-connected member, which is why its membership reaches past states to the territories that run their own meteorological services.

Abbreviation
WMO
Founded
1950-03-23
Headquarters
Geneva
Member states
180 resolved, 193 published by the organisation
Official site
https://wmo.int/

The two counts differ. World Meteorological Organization publishes 193 members; 180 resolved against the 193 states this site has checked. Sometimes that is a disagreement about what counts as a member state — a non-UN state, a territory, a suspended member — and sometimes the compiled source lacks a current statement for a real one. Either way the gap is shown rather than smoothed over, because a table that quietly shows one number cannot be checked against the other.

Six territories are WMO Members alongside the member states -- Hong Kong and French Polynesia among them -- and territories do not appear in the table below.

Member states

Ordered by accession. A state with no recorded date is listed last rather than given one.

A joining date is the one the source records, which may be the day a treaty was signed or the day it took effect. States that joined together can therefore differ by months here.

StateJoinedListed by the source as
Iceland 1948-01-16 —
New Zealand 1948-04-02 —
Russia 1948-04-02 —
Belarus 1948-04-12 —
Ukraine 1948-04-12 —
Romania 1948-08-18 —
Sweden 1948-11-10 —
Norway 1948-12-09 —
United Kingdom 1948-12-14 —
Lebanon 1948-12-22 —
Finland 1949-01-07 —
Switzerland 1949-02-23 —
Australia 1949-03-14 —
Philippines 1949-04-05 —
India 1949-04-27 —
United States 1949-05-04 —
Mexico 1949-05-27 —
Thailand 1949-07-11 —
Turkey 1949-08-05 —
Myanmar 1949-08-19 —
Dominican Republic 1949-09-15 —
Israel 1949-09-30 —
France 1949-12-05 —
Peru 1949-12-30 —
Egypt 1950-01-10 —
South Africa 1950-01-17 —
Greece 1950-01-20 —
Iraq 1950-02-21 —
Ireland 1950-03-14 —
Brazil 1950-03-15 —
Pakistan 1950-04-11 —
Poland 1950-05-16 —
Canada 1950-07-28 —
Paraguay 1950-09-15 —
Indonesia 1950-11-16 —
Argentina 1951-01-02 —
Italy 1951-01-09 —
Uruguay 1951-01-11 —
Portugal 1951-01-15 —
Belgium 1951-02-02 —
Hungary 1951-02-15 —
Spain 1951-02-27 —
China 1951-04-01 People's Republic of China
Sri Lanka 1951-05-23 —
Ecuador 1951-06-07 —
Kingdom of Denmark 1951-07-10 —
Haiti 1951-08-14 —
Kingdom of the Netherlands 1951-09-12 Netherlands
Cuba 1952-03-04 —
Bulgaria 1952-03-12 —
Guatemala 1952-03-21 —
Syria 1952-07-16 —
Luxembourg 1952-10-29 —
Japan 1953-08-11 —
Ethiopia 1953-12-03 —
Germany 1954-06-10 —
Libya 1955 —
Austria 1955-02-23 —
El Salvador 1955-05-27 —
Laos 1955-06-01 —
Jordan 1955-07-11 —
Cambodia 1955-11-08 —
South Korea 1956-02-15 —
Afghanistan 1956-09-11 —
Sudan 1956-12-03 —
Morocco 1957-01-03 —
Tunisia 1957-01-22 —
Ghana 1957-05-06 —
Chile 1957-05-09 —
Albania 1957-07-29 —
Malaysia 1958-05-19 —
Saudi Arabia 1959-02-26 —
Nicaragua 1959-02-27 —
Guinea 1959-03-27 —
Honduras 1960-10-10 —
Niger 1960-10-28 —
Togo 1960-10-28 —
Burkina Faso 1960-10-31 —
Ivory Coast 1960-10-31 —
Democratic Republic of the Congo 1960-11-05 —
Mali 1960-11-11 —
Nigeria 1960-11-30 —
Senegal 1960-12-11 —
Madagascar 1960-12-15 —
Costa Rica 1960-12-16 —
Cameroon 1960-12-17 —
Chad 1961-02-02 —
Benin 1961-05-14 —
Gabon 1961-06-05 —
Central African Republic 1961-06-28 —
Colombia 1962-01-05 —
Mauritania 1962-01-23 —
Sierra Leone 1962-03-30 —
Tanzania 1962-09-14 —
Burundi 1962-10-30 —
Kuwait 1962-12-01 —
Trinidad and Tobago 1963-02-01 —
Rwanda 1963-02-04 —
Uganda 1963-03-15 —
Algeria 1963-04-04 —
Mongolia 1963-04-04 —
Cyprus 1963-04-11 —
Jamaica 1963-05-29 —
Somalia 1964-04-01 —
Kenya 1964-06-02 —
Zambia 1964-12-28 —
Malawi 1965-02-15 —
Singapore 1966-01-24 —
Nepal 1966-08-12 —
Guyana 1966-11-22 —
Barbados 1967-03-22 —
Panama 1967-09-12 —
Botswana 1967-10-16 —
Mauritius 1969-07-17 —
Yemen 1971-07-08 —
Bangladesh 1973-08-24 —
The Bahamas 1973-11-29 —
Liberia 1974-02-07 —
Oman 1975-01-03 —
Qatar 1975-04-04 —
North Korea 1975-05-27 —
Vietnam 1975-07-08 —
Cape Verde 1975-10-21 —
Papua New Guinea 1975-12-15 —
Comoros 1976-03-19 —
Mozambique 1976-06-21 —
Suriname 1976-07-26 —
São Tomé and Príncipe 1976-11-23 —
Malta 1976-12-28 —
Seychelles 1977-02-15 —
Angola 1977-03-16 —
Guinea-Bissau 1977-12-15 —
Maldives 1978-06-01 —
Djibouti 1978-06-30 —
The Gambia 1978-11-01 —
Lesotho 1979-08-03 —
Dominica 1980-02-21 —
Fiji 1980-03-18 —
Bahrain 1980-04-21 —
Zimbabwe 1981-01-12 —
Saint Lucia 1981-03-02 —
Belize 1982-05-25 —
Vanuatu 1982-06-24 —
Eswatini 1982-11-02 —
Brunei 1984-11-26 —
Solomon Islands 1985-05-06 —
United Arab Emirates 1986-12-17 —
Antigua and Barbuda 1988-11-16 —
Namibia 1991-02-06 —
Latvia 1992-05-15 —
Lithuania 1992-06-03 —
Slovenia 1992-08-20 —
Estonia 1992-08-21 —
Armenia 1992-09-16 —
Croatia 1992-10-09 —
Turkmenistan 1992-12-04 —
Uzbekistan 1992-12-23 —
Czech Republic 1993-01-25 —
Slovakia 1993-02-11 —
Kazakhstan 1993-05-05 —
North Macedonia 1993-06-01 —
Eritrea 1993-07-08 —
Tajikistan 1993-08-10 —
Azerbaijan 1993-12-27 —
Bosnia and Herzegovina 1994-06-01 —
Kyrgyzstan 1994-07-20 —
Moldova 1994-11-21 —
Samoa 1995-07-11 —
Tonga 1996-02-25 —
Monaco 1996-04-09 —
Serbia 2001-03-23 —
Bhutan 2003-02-11 —
Kiribati 2003-03-26 —
Montenegro 2007-01-05 —
Timor-Leste 2009-12-04 —
Tuvalu 2012-09-22 —
South Sudan 2012-12-14 —
Andorra 2018-11-16 —
Nauru 2019-05-16 —
Bolivia not recorded —

Its digital estate, measured by us

1 zone of this organisation are in scope for our own passive observation — certificate transparency, DNS, and one ordinary request per host per cycle. This is first-party measurement: nobody else publishes it.

ZoneHosts seen
wmo.int 160

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