World Meteorological Organization
 Official Observations
 * Cloudiness & Rain
 
 Official Forecasts
 Select WMO Region
 * Africa 
 * Asia
 * Europe
 * N. & Central America
 * S. America
 * S.W. Pacific
 What's New
 * Launch of Data Collection or Production for World Weather Information Service 
 * New Version of MyWorldWeather with Additional Language Support and Enhanced User-interface
 * Seven language versions of MyWorldWeather app launched
 * MyWorldWeather on Trial on Android Platform and with Multiple Language Support
 * WWIS Website Hitting One Billion Mark
 * Poland launched Polish version
 * MyWorldWeather - the mobile application of WWIS launched
 * Russia launched Russian version
 * Future version of WWIS launched
 * Italy launched Italian version
 * Germany launched German version
 * France launched French version
 * Spain launched Spanish version
 * New domain name for WWIS
 
 Related Web Sites
 *  WMO
 *  Severe Weather
 
 Other Languages
 *  Arabic Version
 *  Chinese Version
 *  Portuguese Version
 *  Spanish Version
 *  French Version
 *  German Version
 *  Italian Version
 *  Russian Version
 *  Polish Version
 About This Web Site
 Participating Members
 Weather Icons
 Introductory Pamphlet
 Nomination Form
 Search
 Contact
 Note to User
 Disclaimer
 Back to Main Page
This web site is operated
on behalf of WMO by

Hong Kong Observatory
of Hong Kong, China.
 
World Weather Information Service
United States of America
National Weather Service
National Weather Service
Weather Information for Washington DC
  MAPMAP
Weather Forecast
Issued at 07:29  (Local time)  14 Aug  2018 
Date Temperature oC Weather
Minimum Maximum
14 Aug
( Tue ) 		- 29 Mostly Sunny then Chance thunderstorms
Mostly Sunny then Chance thunderstorms
15 Aug
( Wed ) 		21 32 Sunny
Sunny
16 Aug
( Thu ) 		22 33 Partly Sunny
Partly Sunny
17 Aug
( Fri ) 		23 33 Chance thunderstorms
Chance thunderstorms
18 Aug
( Sat ) 		23 31 Chance thunderstorms
Chance thunderstorms
19 Aug
( Sun ) 		21 29 Partly Sunny
Partly Sunny
20 Aug
( Mon ) 		21 29 Mostly Sunny
Mostly Sunny
>> Click here for temperatures in oF
 
Climatological Information
Month Mean Temperature oC Mean Total Rainfall (mm) Mean Number of Rain Days
Daily
Minimum		 Daily
Maximum
Jan -4.5 5.8 68.1 9.9
Feb -3.3 8.0 69.6 9.0
Mar 0.5 13.1 85.9 10.5
Apr 5.6 19.3 88.1 10.7
May 10.7 23.9 115.6 12.2
Jun 16.1 28.8 101.1 10.9
Jul 18.6 31.1 93.2 10.8
Aug 17.9 30.3 89.7 9.4
Sep 13.5 26.3 99.6 8.7
Oct 6.6 20.1 82.6 7.6
Nov 1.8 14.2 86.6 9.1
Dec -2.7 7.8 75.2 9.9
>> Click here for temperatures in oF

Remarks:
* Climatological information is based on monthly averages for the 30-year period 1981-2010.
* Attention: Please note that the averaging period for climatological information and the definition of "Mean Number of Precipitation/Rain Days" quoted in this web site may be different for different countries. Hence, care should be taken when city climatologies are compared.