㈠ 有哪些免费开放且收录城市较完整的天气 API 接口

一 天气预报
国内的天气预报数据，主要是国家气象局和国外两个来源（指数据来源）。
国外方面主要是雅虎（XML格式，谷歌已经停掉了自家的天气API）；
国内数据由国家气象局提供（JSON格式）。
在知乎看到过一篇专业人士评论，雅虎可以提供全球范围的且非常精细的天气数据（小时级更新），但主要是通过计算机自动生成。而国家气象局则是各地经验丰富的专家人士结合计算机综合分析得出，在准确性上更胜一筹。我就这样信了！

国家气象局接口资源及用法
气象局的天气预报主页：移动版普通版 ,仔细挖掘这两个地址可以发现很多好东西哦。
特点：接口多，来自http://weather.com.cn和http://mobile.weather.com.cn都有，次数不限制，服务稳定，功能全面，优先推荐。

1. 实时天气接口
有多个接口，好像差别不大：
实时天气1：http://www.weather.com.cn/data/sk/101190408.html
实时天气2：http://www.weather.com.cn/data/cityinfo/101190408.html
实时天气3（带时间戳）：http://mobile.weather.com.cn/data/sk/101010100.html?_=1381891661455
2. 一周天气预报接口
7天预报数据 URL： http://mobile.weather.com.cn/data/forecast/101010100.html?_=1381891660081
该接口来源气象局移动版网站，目测数据最为精确，详细接口格式如下：
{"c":{"c1":"101010100","c2":"beijing","c3":"北京","c4":"beijing","c5":"北京","c6":"beijing","c7":"北京","c8":"china","c9":"中国","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"}}

详细接口分析如下：
//格式说明
var format={fa:图片1,fb：图片2,fc:温度1,fd：温度2,fe:风向1,ff：风向2,fg:风力1,fh：风力2,fi:日出日落};
//定义天气类型
var weatherArr={"00":"晴","01":"多云","02":"阴","03":"阵雨","04":"雷阵雨","05":"雷阵雨伴有冰雹","06":"雨夹雪","07":"小雨","08":"中雨","09":"大雨","10":"暴雨","11":"大暴雨","12":"特大暴雨","13":"阵雪","14":"小雪","15":"中雪","16":"大雪","17":"暴雪","18":"雾","19":"冻雨","20":"沙尘暴","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":"浮尘","30":"扬沙","31":"强沙尘暴","53":"霾","99":""};
//定义风向数组
var fxArr={"0":"无持续风向","1":"东北风","2":"东风","3":"东南风","4":"南风","5":"西南风","6":"西风","7":"西北风","8":"北风","9":"旋转风"};
//定义风力数组
var flArr={"0":"微风","1":"3-4级","2":"4-5级","3":"5-6级","4":"6-7级","5":"7-8级","6":"8-9级","7":"9-10级","8":"10-11级","9":"11-12级"};

6天预报数据 URL： http://m.weather.com.cn/data/101190408.html
该接口来源网络，应该是一个流传比较久的接口，大发现准确性和稳定性可能不稳定。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天温度范围
"temp1":"22℃~11℃","temp2":"25℃~11℃","temp3":"26℃~13℃","temp4":"25℃~15℃","temp5":"25℃~16℃","temp6":"24℃~16℃",
#6天温度范围（华氏）
"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天天气
"weather1":"多云转晴","weather2":"晴","weather3":"晴","weather4":"晴转多云","weather5":"阴转阵雨","weather6":"多云",
#6天天气图示（每天2张）
"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天天气图示文字（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":"多云","img_title9":"阴","img_title10":"阵雨","img_title11":"多云","img_title12":"多云",
"img_title_single":"多云",
#6天风
"wind1":"北风3-4级转微风","wind2":"微风","wind3":"微风","wind4":"微风","wind5":"微风","wind6":"微风",
"fx1":"北风","fx2":"微风",
#6天风力情况
"fl1":"3-4级转小于3级","fl2":"小于3级","fl3":"小于3级","fl4":"小于3级","fl5":"小于3级","fl6":"小于3级",
#24小时内
"index":"较冷","index_d":"建议着大衣、呢外套加毛衣、卫衣等服装。体弱者宜着厚外套、厚毛衣。因昼夜温差较大，注意增减衣服。",
#48小时内
"index48":"较舒适","index48_d":"建议着薄外套或牛仔衫裤等服装。年老体弱者宜着夹克衫、薄毛衣等。昼夜温差较大，注意适当增减衣服。",
#紫外 洗车 旅游 舒适指数 晨练 晾晒 过敏
"index_uv":"弱",
"index48_uv":"强",
"index_xc":"适宜",
"index_tr":"适宜",
"index_co":"舒",
"st1":"21","st2":"12","st3":"24","st4":"12","st5":"25","st6":"14", #不明
"index_cl":"较适宜",
"index_ls":"适宜",
"index_ag":"极易发"
}}

㈡ 自动气象站记录的数据分别是什么意思

文件名：抄AWS_58265_20100111.RTD
指站名为58265的站，在2010年1月11日当天自动站全要素分钟数据文件，与TT.txt文件中的不同，RTD包括了地温。

RRD则是自动站辐射数据文件。

RTD、RRD是每日自动备份的数据文件。

RTD文件有它自己的格式，一般来说第一行是台站信息等，如以后每一行是一个要素。RTD文件对自动气象站数据质量控制很重要。

如果楼主想搞清楚内容的话，可以去找相差的书来看下。我记得有一本是叫做什么测报数据格式什么的，蓝灰色的封面，那里说的很详细。