其官方网址为：http://www.openweathermap.org/api
静态截图：
具备以下的一些特点：
1. Current weather data 当前天气的数据
2. 5 and 16 day forecast 5到16天的天气预报
3. Historical data 以往的天气信息
4. Weather stations 气象站点
5. Weather map layers 详细的气象信息
以下是本人的测试结果（根据经纬度直接获取天气预报的信息的接口示例，返回的数据为JSON）：
// http://www.openweathermap.org/api
// http://www.openweathermap.org/current
// http://www.openweathermap.org/forecast
// http://www.openweathermap.org/weather-conditions
NETWorkRequest *request = [[NETWorkRequest alloc] initWithUrlString:@"http://api.openweathermap.org/data/2.5/forecast/daily?lat=39.88293652833437&lon=116.4621119300779&lang=zh_cn"];
NETWorkConnection *connection = [[NETWorkConnection alloc] initWithRequest:request];
[connection infoBlock:^(NSDictionary *info, NETWorkConnection *myConnection) {
} progressBlock:^(long long currentBytes, long long totalBytes, NETWorkConnection *myConnection) {
} resultBlock:^(NSDictionary *info, NSData *data, NSError *error, NETWorkConnection *myConnection) {
NSLog(@"%@", [data toPropertyList]);
}];
[connection start];
打印信息如下：
{
city = {
coord = {
lat = "39.905281";
lon = "116.599442";
};
country = CN;
id = 1792520;
name = Tongzhou;
population = 0;
};
cnt = 7;
cod = 200;
list = (
{
clouds = 48;
deg = 254;
dt = 1413860400;
humidity = 49;
pressure = "1018.75";
speed = "2.06";
temp = {
day = "290.15";
eve = "289.23";
max = "291.57";
min = "279.75";
morn = "285.15";
night = "279.75";
};
weather = (
{
description = "\U591a\U4e91";
icon = 03d;
id = 802;
main = Clouds;
}
);
},
{
clouds = 44;
deg = 184;
dt = 1413946800;
humidity = 56;
pressure = "1016.36";
speed = "1.71";
temp = {
day = "287.61";
eve = "287.9";
max = "289.8";
min = "277.35";
morn = "277.35";
night = "279.92";
};
weather = (
{
description = "\U591a\U4e91";
icon = 03d;
id = 802;
main = Clouds;
}
);
},
{
clouds = 0;
deg = 214;
dt = 1414033200;
humidity = 0;
pressure = "1003.24";
speed = "1.89";
temp = {
day = "291.47";
eve = "281.35";
max = "291.47";
min = "277.05";
morn = "278.44";
night = "277.05";
};
weather = (
{
description = "\U6674";
icon = 01d;
id = 800;
main = Clear;
}
);
},
{
clouds = 0;
deg = 162;
dt = 1414119600;
humidity = 0;
pressure = "1002.31";
speed = "1.98";
temp = {
day = "293.07";
eve = "284.09";
max = "293.07";
min = "279.56";
morn = "280.17";
night = "279.56";
};
weather = (
{
description = "\U6674";
icon = 01d;
id = 800;
main = Clear;
}
);
},
{
clouds = 1;
deg = 84;
dt = 1414206000;
humidity = 0;
pressure = "1009.16";
speed = "6.79";
temp = {
day = "292.6";
eve = "285.1";
max = "292.6";
min = "279.54";
morn = "282.6";
night = "279.54";
};
weather = (
{
description = "\U5c0f\U96e8";
icon = 10d;
id = 500;
main = Rain;
}
);
},
{
clouds = 15;
deg = 212;
dt = 1414292400;
humidity = 0;
pressure = "1011.96";
speed = "2.17";
temp = {
day = "290.18";
eve = "282.25";
max = "290.18";
min = "279.5";
morn = "279.93";
night = "279.5";
};
weather = (
{
description = "\U6674";
icon = 01d;
id = 800;
main = Clear;
}
);
},
{
clouds = 24;
deg = 151;
dt = 1414378800;
humidity = 0;
pressure = "1006.46";
speed = "1.88";
temp = {
day = "290.33";
eve = "282.58";
max = "290.33";
min = "279.86";
morn = "282.81";
night = "279.86";
};
weather = (
{
description = "\U6674";
icon = 01d;
id = 800;
main = Clear;
}
);
}
);
message = "0.3612";
}
其他的就自己去看官方api了，不过是英文的。