壹 天氣預報
國內的天氣預報數據，主要是國家氣象局和國外兩個來源（指數據來源）。
國外方面主要是雅虎（XML格式，谷歌已經停掉了自家的天氣API）；
國內數據由國家氣象局提供（JSON格式）。
在知乎看到過壹篇專業人士評論，雅虎可以提供全球範圍的且非常精細的天氣數據（小時級更新），但主要是通過計算機自動生成。而國家氣象局則是各地經驗豐富的專家人士結合計算機綜合分析得出，在準確性上更勝壹籌。我就這樣信了！
國家氣象局接口資源及用法
氣象局的天氣預報主頁：移動版普通版 ,仔細挖掘這兩個地址可以發現很多好東西哦。
特點：接口多，來自weather.com.cn和mobile.weather.com.cn都有，次數不限制，服務穩定，功能全面，優先推薦。
1. 實時天氣接口
有多個接口，好像差別不大：
實時天氣1：/data/sk/101190408.html
實時天氣2：/data/cityinfo/101190408.html
實時天氣3（帶時間戳）：/data/sk/101010100.html?_=1381891661455
2. 壹周天氣預報接口
7天預報數據 URL： /data/forecast/101010100.html?_=1381891660081
該接口來源氣象局移動版網站，目測數據最為精確，詳細接口格式如下：
{"c":{"c1":"101010100","c2":"beijing","c3":"北京","c4":"beijing","c5":"北京","c6":"beijing","c7":"北京","c8":"china","c9":"中國","c10":"1","c11":"010","c12":"100000","c13":"116.391","c14":"39.904","c15":"33","c16":"AZ9010","c17":"+8"},
"f":{"f1":
[
{"fa":"01","fb":"03","fc":"10","fd":"5","fe":"0","ff":"0","fg":"0","fh":"0","fi":"06:21|17:40"},
{"fa":"07","fb":"07","fc":"19","fd":"12","fe":"0","ff":"0","fg":"0","fh":"0","fi":"06:22|17:38"},
{"fa":"02","fb":"00","fc":"15","fd":"5","fe":"8","ff":"8","fg":"3","fh":"1","fi":"06:23|17:37"},
{"fa":"00","fb":"00","fc":"16","fd":"4","fe":"0","ff":"0","fg":"0","fh":"0","fi":"06:24|17:35"},
{"fa":"00","fb":"00","fc":"18","fd":"7","fe":"0","ff":"0","fg":"0","fh":"0","fi":"06:25|17:34"},
{"fa":"00","fb":"01","fc":"18","fd":"8","fe":"0","ff":"0","fg":"0","fh":"0","fi":"06:26|17:32"},
{"fa":"01","fb":"01","fc":"16","fd":"6","fe":"0","ff":"0","fg":"0","fh":"0","fi":"06:27|17:31"}],
"f0":"201310121100"}}
詳細接口分析如下：
//格式說明
var format={fa:圖片1,fb：圖片2,fc:溫度1,fd：溫度2,fe:風向1,ff：風向2,fg:風力1,fh：風力2,fi:日出日落};
//定義天氣類型
var weatherArr={"00":"晴","01":"多雲","02":"陰","03":"陣雨","04":"雷陣雨","05":"雷陣雨伴有冰雹","06":"雨夾雪","07":"小雨","08":"中雨","09":"大雨","10":"暴雨","11":"大暴雨","12":"特大暴雨","13":"陣雪","14":"小雪","15":"中雪","16":"大雪","17":"暴雪","18":"霧","19":"凍雨","20":"沙塵暴","21":"小到中雨","22":"中到大雨","23":"大到暴雨","24":"暴雨到大暴雨","25":"大暴雨到特大暴雨","26":"小到中雪","27":"中到大雪","28":"大到暴雪","29":"浮塵","30":"揚沙","31":"強沙塵暴","53":"霾","99":""};
//定義風向數組
var fxArr={"0":"無持續風向","1":"東北風","2":"東風","3":"東南風","4":"南風","5":"西南風","6":"西風","7":"西北風","8":"北風","9":"旋轉風"};
//定義風力數組
var flArr={"0":"微風","1":"3-4級","2":"4-5級","3":"5-6級","4":"6-7級","5":"7-8級","6":"8-9級","7":"9-10級","8":"10-11級","9":"11-12級"};
6天預報數據 URL： /data/101190408.html
該接口來源網絡，應該是壹個流傳比較久的接口，大發現準確性和穩定性可能不穩定。接口分析如下：
{"weatherinfo":{
#基本信息
"city":"北京","city_en":"beijing","date_y":"2013年9月24日","date":"","week":"星期二","fchh":"11","cityid":"101010100",
#6天溫度範圍
"temp1":"22℃~11℃","temp2":"25℃~11℃","temp3":"26℃~13℃","temp4":"25℃~15℃","temp5":"25℃~16℃","temp6":"24℃~16℃",
#6天溫度範圍（華氏）
"tempF1":"71.6℉~51.8℉","tempF2":"77℉~51.8℉","tempF3":"78.8℉~55.4℉","tempF4":"77℉~59℉","tempF5":"77℉~60.8℉","tempF6":"75.2℉~60.8℉",
#6天天氣
"weather1":"多雲轉晴","weather2":"晴","weather3":"晴","weather4":"晴轉多雲","weather5":"陰轉陣雨","weather6":"多雲",
#6天天氣圖示（每天2張）
"img1":"1","img2":"0","img3":"0","img4":"99","img5":"0","img6":"99","img7":"0","img8":"1","img9":"2","img10":"3","img11":"1","img12":"99",
"img_single":"1",
#6天天氣圖示文字（每天2）
"img_title1":"多","img_title2":"晴","img_title3":"晴","img_title4":"晴","img_title5":"晴","img_title6":"晴","img_title7":"晴","img_title8":"多雲","img_title9":"陰","img_title10":"陣雨","img_title11":"多雲","img_title12":"多雲",
"img_title_single":"多雲",
#6天風
"wind1":"北風3-4級轉微風","wind2":"微風","wind3":"微風","wind4":"微風","wind5":"微風","wind6":"微風",
"fx1":"北風","fx2":"微風",
#6天風力情況
"fl1":"3-4級轉小於3級","fl2":"小於3級","fl3":"小於3級","fl4":"小於3級","fl5":"小於3級","fl6":"小於3級",
#24小時內
"index":"較冷","index_d":"建議著大衣、呢外套加毛衣、衛衣等服裝。體弱者宜著厚外套、厚毛衣。因晝夜溫差較大，註意增減衣服。",
#48小時內
"index48":"較舒適","index48_d":"建議著薄外套或牛仔衫褲等服裝。年老體弱者宜著夾克衫、薄毛衣等。晝夜溫差較大，註意適當增減衣服。",
#紫外 洗車 旅遊 舒適指數 晨練 晾曬 過敏
"index_uv":"弱",
"index48_uv":"強",
"index_xc":"適宜",
"index_tr":"適宜",
"index_co":"舒",
"st1":"21","st2":"12","st3":"24","st4":"12","st5":"25","st6":"14", #不明
"index_cl":"較適宜",
"index_ls":"適宜",
"index_ag":"極易發"
}}