Washington: Today - Fair, high near 20, low 5 to 10. Chance of precipitation 10 per cent today, 20 per cent tonight. Wednesday - Partly cloudy, high near 20.

Maryland and Virginia: Today - Cloudy, highs 5 to 10 in west to near 20 in east, lows from 5 below zero in west to 5 to 10 in east. Light snow is likely in west tonight. Wednesday - Partly cloudy, high in teens to low 20s.

Lower Potomac and Chesapeake Bay: Today - Fair today, cloudy tonight with visibility greater than 5 miles through tonight. Winds should be westerly at 10 to 18 knots this morning, becoming westerly to northwesterly at 12 to 22 knots later today and tonight.

Extended Area Outlook: For Thursday through Saturday - Fair skies Thursday and Saturday with chance of snow Friday. Highs should average in 20s, lows in teens, cooler in mountains. Washington's normal temperature range for this time of year is 44 to 28.

West Virginia: Today - Snow flurries through tonight, highs near 20 in eastern panhandle, 5 to 15 elsewhere, lows from 10 below zero to near zero. Wednesday - Partly cloudy, highs near 20 eastern panhandle, 5 to 15 elsewhere.

The Nation Yesterday: Extremely cold air continued to dominate the eastern half of the nation last night. Subzero temperatures were forecast over the Dekotas eastward through most of the north Atlantic Coast states. A hard freeze warning was posted for the northern half of Florida where temperatures were forecast to dip into the teens and 20s. A frost or freeze warning was posted for southern Florida where lows in 20s and 30s were expected, except for mild 50s in the Florida Keys. Residents of western Pennsylvania were advised that the wind chill factor would range from 50 to 60 below zero both last night and today. Light afternoon and evening snows were widespread over most of Nebraska, Kansas and western Missouri. Travelers advisories were posted through the evening hours in the Nebraska Panhandle and through the night in the Kansas City and St. Joseph Mo. areas. Northerly winds gusting to 25 and 35 m.p.h. in Nebraska were spreading southward and caused some blowing and drifting of the new snow. Cheyenne, Wy., reported wind gusts as high as 73 m.p.h. yesterday evening. It was also snowing in much of Michigan, northeast Ohio and the lower Great Lakes region and in parts of Pennsylvania and Maine. West of the Continental Divide, temperatures were milder. Rain had spread over western Washington state. The southern California coast had unseasonably warm temperatures in the mid 80s. While a brief break in the cold weather was forecast for the western great Plains, the cold should persist in the East. The outlook for the insuguration on Thursday is fair and very cold with a high of about 20 degrees.

The National Weather Forecast for Today - Snow will fall over the lower Great Lakes region and the Appalacheins into Kentucky and the central Gulf Coast states. Some rain or snow will be scattered from the western Dakotas to the northern Rockies. Washington state will have showers with fog in the valleys from the central Pacific Coast into southwest Idaho. Extremely cold weather will dominate the eastern half of the nation into the eastern sections of the great Plains. It will be warm in southern California with mild temperatures from Washington state through the northern halves of the plateau and the Rocky Mountain regions. The southern Rockies will be cold.

ALMANAC DATA FOR TUESDAY, JAN. 18: Sun rises 7:24 a.m., sets 5:13 p.m.; moon rises 6:14 a.m., sets 4:37 p.m. Tides: High 6:52 a.m. and 7:20 p.m., low 1:12 a.m. and 1:23 p.m. High and low tides at the following points can be obtained by subtracting the hours indicated from the tides above. Annapolis (3 1/4); Bloody Point Lighthouse (4 1/2); Deale, Md. (4 1/2); Colonial Beach (6); Norfolk (1 1/2); Virginia Beach (1); Solomon's Island (6 1/4); Point Lookout (7).

The Council of Governments' Air Quality Index for yesterday showed the high reading in the Washington area during the 2 to 3 p.m. period was 22 for the pollutant, photochemical oxidants. Index values between 0 and 24 indicate good air quality. When the index exceeds 100 the air becomes hazardous and persons with lung, heart and eye problems should restrict their activity. The forecast for today indicates the air quality will remain about the same.

The National Weather Service forecasts that the Potomac River stage at Little Falls will remain near 3.2 feet today.

Washington data at 7 p.m. (EST) yesterday: Highest temperature since 7 a.m. yesterday, 18 degrees at 2:39 p.m. Lowest temperature since midnight, 2 degrees at 4:10 a.m. Record high temperature for today, 67 degrees in 1929. Record low temperature for today, -6 degrees in 1243. Deficiency of temperature since Jan. 1, 180 degrees. Relative humidity: Maximum, 42 per cent at 8 a.m.; Minimum, 34 per cent at 5 p.m. 24-hour precipitation, none. Deficiency of precipitation since Jan. 1, .06 inches. Highest observed wind since 7 a.m. 18 9:53 a.m. Peak gust since 7 a.m., 30 miles per hour from the S.W. at 2:08 p.m. Local Temp., Humidity(TABLE) Time(COLUMN)T.(COLUMN)H. 12 mid.(COLUMN)4(COLUMN)38 1 a.m.(COLUMN)4(COLUMN)38 2 a.m.(COLUMN)3(COLUMN)40 3 a.m.(COLUMN)3(COLUMN)40 4 a.m.(COLUMN)3(COLUMN)40 5 a.m.(COLUMN)2(COLUMN)41 6 a.m.(COLUMN)2(COLUMN)41 7 a.m.(COLUMN)2(COLUMN)41 8 a.m.(COLUMN)3(COLUMN)42 9 a.m.(COLUMN)5(COLUMN)42 10 a.m.(COLUMN)9(COLUMN)39 11 a.m.(COLUMN)11(COLUMN)37 12 noon(COLUMN)14(COLUMN)36 1 p.m.(COLUMN)16(COLUMN)37 2 p.m.(COLUMN)17(COLUMN)37 3 p.m.(COLUMN)18(COLUMN)35 4 p.m.(COLUMN)18(COLUMN)35 5 p.m.(COLUMN)18(COLUMN)34 6 p.m.(COLUMN)16(COLUMN)38(END TABLE) Temperatures ending 7 p.m. (EST) yesterday:(TABLE) City(COLUMN)L.(COLUMN)H. Albany(COLUMN)-10(COLUMN)14 Albuquerque(COLUMN)12(COLUMN)40 Amarillo(COLUMN)21(COLUMN)53 Anchorage(COLUMN)33(COLUMN)42 Asheville(COLUMN)-05(COLUMN)18 Atlanta(COLUMN)01(COLUMN)25 Atlantic City(COLUMN)04(COLUMN)13 Austin(COLUMN)26(COLUMN)47 Baltimore(COLUMN)-02(COLUMN)17 Billings(COLUMN)20(COLUMN)42 Bismarck(COLUMN)-21(COLUMN)-07 Boise(COLUMN)19(COLUMN)35 Boston(COLUMN)05(COLUMN)15 Brownsville(COLUMN)39(COLUMN)46 Buffalo(COLUMN)-04(COLUMN)01 Burl'gton, Vt.(COLUMN)-08(COLUMN)00 Casper(COLUMN)16(COLUMN)38 Charleston, S.C.(COLUMN)20(COLUMN)32 Ch'rlst'n, W Va(COLUMN)-10(COLUMN)06 Charlotte, N.C.(COLUMN)05(COLUMN)25 Cheyenne(COLUMN)13(COLUMN)37 Chicago(COLUMN)-12(COLUMN)04 Cincinnati(COLUMN)-24(COLUMN)-01 Cleveland(COLUMN)-17(COLUMN)-02 Columbia, S.C.(COLUMN)09(COLUMN)30 Columbus, Oh.(COLUMN)-19(COLUMN)-08 Dal.-Ft. Worth(COLUMN)17(COLUMN)46 Dayton(COLUMN)-21(COLUMN)-02 Denver(COLUMN)18(COLUMN)53 Des Moines(COLUMN)-15(COLUMN)08 Detroit(COLUMN)-10(COLUMN)10 Duluth(COLUMN)-20(COLUMN)05 El Paso(COLUMN)28(COLUMN)56 Fairbanks(COLUMN)01(COLUMN)24 Fargo(COLUMN)-32(COLUMN)-07 Flagstaff(COLUMN)28(COLUMN)47 Great Falls(COLUMN)30(COLUMN)45 Hartford(COLUMN)00(COLUMN)13 Helena(COLUMN)20(COLUMN)47 Honolulu(COLUMN)71(COLUMN)83 Houston(COLUMN)29(COLUMN)45 Indianapolis(COLUMN)-20(COLUMN)00 Jackson, Miss.(COLUMN)10(COLUMN)34 Jacksonville(COLUMN)21(COLUMN)34 Juneau(COLUMN)34(COLUMN)43 Kansas City(COLUMN)-04(COLUMN)19 Las Vegas(COLUMN)32(COLUMN)71 Little Rock(COLUMN)06(COLUMN)31 Los Angeles(COLUMN)50(COLUMN)82 Louisville(COLUMN)-13(COLUMN)07 Memphis(COLUMN)08(COLUMN)26 Miami Beach(COLUMN)47(COLUMN)61 Midland(COLUMN)18(COLUMN)50 Milwaukee(COLUMN)-14(COLUMN)04 Mpls.-St. Paul(COLUMN)-25(COLUMN)-02 Nashville(COLUMN)-05(COLUMN)17 New Orleans(COLUMN)23(COLUMN)35 New York(COLUMN)-01(COLUMN)12 Norfolk, Va.(COLUMN)05(COLUMN)18 North Platte(COLUMN)06(COLUMN)34 Oklahoma City(COLUMN)13(COLUMN)50 Omaha(COLUMN)-08(COLUMN)09 Orlando(COLUMN)30(COLUMN)46 Philadelphia(COLUMN)-04(COLUMN)08 Phoenix(COLUMN)42(COLUMN)70 Pittsburgh(COLUMN)-17(COLUMN)-02 Portland, Me.(COLUMN)-02(COLUMN)09 Portland, Ore.(COLUMN)33(COLUMN)52 Providence(COLUMN)03(COLUMN)14 Raleigh(COLUMN)-01(COLUMN)20 Rapid City(COLUMN)00(COLUMN)24 Reno(COLUMN)14(COLUMN)51 Richmond(COLUMN)-01(COLUMN)17 St. Louis(COLUMN)-12(COLUMN)10 St. Prbg.-Tampa(COLUMN)33(COLUMN)48 Salt Lake City(COLUMN)23(COLUMN)45 San Antonio(COLUMN)30(COLUMN)47 San Diego(COLUMN)50(COLUMN)86 San Francisco(COLUMN)41(COLUMN)48 San Juan, P.R.(COLUMN)71(COLUMN)86 St. Ste. Marie(COLUMN)-06(COLUMN)06 Seattle(COLUMN)51(COLUMN)55 Shreveport(COLUMN)14(COLUMN)44 Sioux Falls(COLUMN)-17(COLUMN)00 Spokane(COLUMN)34(COLUMN)42 Syracuse(COLUMN)03(COLUMN)06 Tucson(COLUMN)37(COLUMN)63 Tulsa(COLUMN)09(COLUMN)42 Washington(COLUMN)02(COLUMN)18 Wichita(COLUMN)09(COLUMN)47(END TABLE) Temperatures Abroad Yesterday(TABLE) City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)25 Amsterdam(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)41 Ankara(COLUMN)cloudy(COLUMN)3 p.m.(COLUMN)36 Athens(COLUMN)pt. cldy.(COLUMN)2 p.m.(COLUMN)54 Auckland(COLUMN)cloudy(COLUMN)midnight(COLUMN)63 Berlin(COLUMN)snow(COLUMN)1 p.m.(COLUMN)32 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)32 Brussels(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)34 Cairo(COLUMN)clear(COLUMN)2 p.m.(COLUMN)66 Copenhagen(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)34 Copenhagen(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)39 Dublin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)39 Geneva(COLUMN)clear(COLUMN)1 p.m.(COLUMN)30 Hong Kong(COLUMN)clear(COLUMN)8 p.m.(COLUMN)59 Lisbon(COLUMN)cloudy(COLUMN)noon(COLUMN)54 London(COLUMN)fog(COLUMN)1 p.m.(COLUMN)32 Madrid(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)45 Malta(COLUMN)clear(COLUMN)1 p.m.(COLUMN)55 Manila(COLUMN)pt. cldy.(COLUMN)8 p.m.(COLUMN)79 Moscow(COLUMN)pt. cldy.(COLUMN)3 p.m.(COLUMN)23 New Delhi(COLUMN)clear(COLUMN)5 p.m.(COLUMN)64 Nice(COLUMN)clear(COLUMN)1 p.m.(COLUMN)50 Oslo(COLUMN)snow(COLUMN)1 p.m.(COLUMN)25 Paris(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)37 Peking(COLUMN)clear(COLUMN)8 p.m.(COLUMN)18 Rome(COLUMN)clear(COLUMN)1 p.m.(COLUMN)48 Saigon(COLUMN)clear(COLUMN)8 p.m.(COLUMN)86 Sofia(COLUMN)snow(COLUMN)2 p.m.(COLUMN)28 Stockholm(COLUMN)snow(COLUMN)1 p.m.(COLUMN)32 Sydney(COLUMN)cloudy(COLUMN)10 p.m.(COLUMN)73 Tel Aviv(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)63 Tokyo(COLUMN)clear(COLUMN)9 p.m.(COLUMN)43 Tunis(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)52 Vienna(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)36 Warsaw(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)25(END TABLE) Temperatures (Western Hemisphere)(TABLE) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)pt. cldy.(COLUMN)88(COLUMN)75 Barbados(COLUMN)pt. cldy.(COLUMN)82(COLUMN)79 Bermuda(COLUMN)cloudy(COLUMN)66(COLUMN)62 Bogota(COLUMN)pt. cldy.(COLUMN)72(COLUMN)39 Calgary(COLUMN)clear(COLUMN)37(COLUMN)27 Culiacan(COLUMN)pt. cldy.(COLUMN)85(COLUMN)57 Edmonton(COLUMN)pt. cldy.(COLUMN)14(COLUMN)10 Havana(COLUMN)pt. cldy.(COLUMN)83(COLUMN)63 Montego Bay(COLUMN)pt. cldy.(COLUMN)85(COLUMN)68 Mexico City(COLUMN)haze(COLUMN)72(COLUMN)45 Monterrey(COLUMN)cloudy(COLUMN)59(COLUMN)37 Montreal(COLUMN)pt. cldy.(COLUMN)10(COLUMN)-11 Nassau(COLUMN)pt. cldy.(COLUMN)81(COLUMN)64 Ottawa(COLUMN)snow(COLUMN)9(COLUMN)-11 Regina(COLUMN)cloudy(COLUMN)-6(COLUMN)-15 St. Kitts(COLUMN)pt. cldy.(COLUMN)81(COLUMN)71 St. Thomas(COLUMN)pt. cldy.(COLUMN)84(COLUMN)71 Toronto(COLUMN)snow(COLUMN)3(COLUMN)-6 Vancouver(COLUMN)cloudy(COLUMN)48(COLUMN)46 Veracruz(COLUMN)cloudy(COLUMN)72(COLUMN)64 Winnipeg(COLUMN)snow(COLUMN)-15(COLUMN)-36(END TABLE)