United States
- Alabama (28)
- Alaska (126)
- Arizona (29)
- Arkansas (32)
- California (105)
- Colorado (40)
- Connecticut (9)
- Delaware (3)
- District of Columbia (1)
- Florida (67)
- Georgia (44)
- Hawaii (12)
- Idaho (19)
- Illinois (58)
- Indiana (20)
- Iowa (55)
- Kansas (30)
- Kentucky (18)
- Louisiana (32)
- Maine (17)
- Maryland (23)
- Massachusetts (23)
- Michigan (72)
- Minnesota (96)
- Mississippi (19)
- Missouri (25)
- Montana (21)
- Nebraska (38)
- Nevada (13)
- New Hampshire (13)
- New Jersey (15)
- New Mexico (27)
- New York (34)
- North Carolina (66)
- North Dakota (13)
- Ohio (35)
- Oklahoma (48)
- Oregon (30)
- Pennsylvania (36)
- Rhode Island (6)
- South Carolina (30)
- South Dakota (20)
- Tennessee (12)
- Texas (154)
- Utah (12)
- Vermont (9)
- Virginia (46)
- Washington (39)
- West Virginia (15)
- Wisconsin (57)
- Wyoming (20)
Canada
- Alberta (86)
- British Columbia (79)
- Manitoba (23)
- New Brunswick (12)
- Newfoundland and Labrador (21)
- Northwest Territories (24)
- Nova Scotia (21)
- Nunavut (27)
- Ontario (70)
- Prince Edward Island (6)
- Quebec (80)
- Saskatchewan (40)
- Yukon Territory (12)
Europe
- Albania (1)
- Austria (10)
- Belarus (7)
- Belgium (12)
- Bosnia and Herzegovina (3)
- Bulgaria (5)
- Croatia (6)
- Czech Republic (11)
- Denmark (12)
- Estonia (3)
- Faroe Islands (1)
- Finland (27)
- France (103)
- Germany (77)
- Gibraltar (1)
- Greece (30)
- Hungary (8)
- Iceland (4)
- Ireland (4)
- Italy (76)
- Latvia (2)
- Lithuania (4)
- Luxembourg (1)
- Macedonia (2)
- Malta (1)
- Moldova (1)
- Montenegro (2)
- The Netherlands (12)
- Norway (41)
- Poland (9)
- Portugal (12)
- Romania (16)
- Russian Federation (41)
- Serbia (5)
- Slovakia (10)
- Slovenia (4)
- Spain (40)
- Svalbard and Jan Mayen (1)
- Sweden (34)
- Switzerland (10)
- Ukraine (18)
- United Kingdom (83)
Africa
- Algeria (35)
- Benin (1)
- Botswana (5)
- Burkina Faso (1)
- Cameroon (2)
- Cape Verde (1)
- Central African Republic (1)
- Chad (2)
- Comoros (1)
- Congo (2)
- Côte d'Ivoire (1)
- Democratic Republic of the Congo (1)
- Egypt (11)
- Equatorial Guinea (1)
- Gabon (1)
- The Gambia (1)
- Ghana (1)
- Guinea-Bissau (1)
- Kenya (2)
- Liberia (1)
- Madagascar (5)
- Mali (1)
- Mauritania (2)
- Mauritius (2)
- Mayotte (1)
- Morocco (14)
- Mozambique (2)
- Niger (3)
- Nigeria (1)
- Reunion (2)
- Rwanda (1)
- Senegal (5)
- Seychelles (1)
- South Africa (14)
- St. Helena (1)
- Sudan (1)
- Swaziland (1)
- Togo (1)
- Tunisia (11)
- Uganda (1)
- Western Sahara (1)
- Zambia (1)
Asia
- Afghanistan (12)
- Armenia (2)
- Azerbaijan (2)
- Bahrain (1)
- Bangladesh (1)
- Brunei Darussalam (1)
- Cambodia (2)
- China (33)
- Christmas Island (1)
- Cyprus (4)
- Georgia (3)
- Guam (2)
- Hong Kong (1)
- India (15)
- Indonesia (8)
- Iran (49)
- Iraq (3)
- Israel (6)
- Japan (65)
- Jordan (3)
- Kazakhstan (12)
- Kuwait (3)
- Kyrgyzstan (2)
- Lebanon (1)
- Macau (1)
- Malaysia (24)
- Maldives (1)
- Marshall Islands (1)
- Mongolia (1)
- Myanmar (Burma) (2)
- Northern Mariana Islands (3)
- Oman (2)
- Pakistan (5)
- Palau (2)
- Philippines (7)
- Qatar (2)
- Saudi Arabia (30)
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- Taiwan (3)
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- Thailand (19)
- Turkey (24)
- Turkmenistan (5)
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- United Arab Emirates (9)
- Uzbekistan (9)
- Vietnam (3)
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- Yemen (6)
Australia
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- Australia (43)
- Cocos (Keeling) Islands (1)
- Cook Islands (1)
- Fiji (2)
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- Micronesia (2)
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- New Zealand (3)
- Niue (1)
- Norfolk Island (1)
- Papua New Guinea (1)
- Samoa (1)
- Solomon Islands (1)
- Tonga (1)
North America
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- Aruba (1)
- The Bahamas (3)
- Barbados (1)
- Belize (1)
- Bermuda (1)
- Cayman Islands (1)
- Costa Rica (4)
- Cuba (7)
- Dominica (1)
- Dominican Republic (6)
- El Salvador (2)
- Greenland (12)
- Grenada (1)
- Guadeloupe (1)
- Guatemala (5)
- Honduras (12)
- Jamaica (2)
- Martinique (1)
- Mexico (57)
- Midway Islands (1)
- Netherlands Antilles (1)
- Nicaragua (6)
- Panama (3)
- Puerto Rico (3)
- St Lucia (1)
- St Pierre and Miquelon (1)
- St. Kitts and Nevis (1)
- St. Lucia (1)
- St. Vincent and the Grenadines (1)
- Trinidad & Tobago (2)
- US Virgin Islands (2)
Numbers in parenthesis are the number of stations with averages available. It is not necessarily all stations in that area.