Washington; Today -- Increasing cloudiness, high in the mid 30s, low in the mid 20s. The chance of rain is near zero today, 20 percent tonight. Winds will become light and variable. Tuesday -- Cloudy, high near 40.

Maryland and Virginia: Today -- Increasing cloudiness, highs from the mid 20s to the low 40s, lows in the teens and 20s. Tuesday -- Cloudy, highs from the 30s low 40s.

West Virginia: Today -- Increasing cloudiness, high in the 20s, low in the teens. Tuesday -- Partly cloudy, highs from the upper 20s to the 30s.

Extended Area Forecast for Wednesday through Friday -- Cloudy with a good chance of rain Thursday and Friday. Temperatures will be seasonable with highs averaging from the 40s to the mid 50s, lows in the 30s. Normal Washington temperatures are a high of 45 and a low of 30.

Lower Potomac and Chesapeake Bay -- Increasing cloudiness. Visibility will be 5 miles or more. Winds will be light and variable becoming northeasterly at 6 to 12 knots by nightfall. Waves will average 1 to 2 feet.

The Nation Yesterday: Dry cool air settled over much of the nation keeping the temperatures low, most of the northern third was below freezing. A few places in the northern Plains were below zero. The southern states enjoyed the late fall weather. Temperatures rose into the 50s, humidity was low and sunshine was abundant. A few snowshowers persisted over the lower Great Lakes and New England, but most were very light. The newest storm system was poised off the coast of Washington, already spreading showers across the Pacific Northwest. The Southwest was cool while southern Callfornia was warming to near normal temperatures.

The National Weather Forecast for today -- Most of the nation will have sunny and cool weather. Snow will spread across the Great Likes region. Showers will be scattered over the Pacific Northwest with a few snowshowers in the higher elevations. Temperatures will not warm above freezing from the Dakotas through the Great Lakes region into New England. Even temperatures in the Gulf Coast states will only reach the 50s.

Almanac Data for today: The sun rises 7:16 a.m., sets 4:46 p.m.; moon rises 3:13 p.m., sets 4:13 am. Tides: high 5:34 am. and 6:05 pm., low 11:06 p.m. High and low tides at the following locations may be obtained by subtracting the hours indicated from the hours above: Annaplis (3 1/4), Bloody Point Lighthouse (4 1/2), Deale, Md (4 1/2), Colonial Beach (5 1/4), Norfolk (1), Virginia (3/4), Solomons Island (6 1/4), Point Lookout (7).

The Councli of Government's Air Quality Index for yesterday showed the high reading in the Washington area during the 9 a.m. periord was 19 for the pollutant, photochemical oxidants. Index values between 0 and 24 indicate good air quality. When the index exceeds 100 the air is considered very unhealthy and individuals with lung, heart and eye ailments are urged to restrict their activity. The forecast for today indicates that the air quality will remain good.

The National Weather Service forecasts the Potomac River stage at Little Falls should rise from 4.5 to 4.8 feet today.

Washington data for yesterday: Highest temperature since midnight yesterday, 36 degrees at 3:48 p.m. Lowest temperature since midnight, 30 degrees at 6:12 a.m. Excess of temperature since Dec. 1, 99 degrees. Excess of temperature since Jan. 1, 315 degrees. Record high temperature for today, 68 degrees in 1971. Record low temperature for today, 12 degrees in 1917. Relative humidity: maximum, 51 percent at 4 a.m.; minimum, 40 percent at 4 p.m. 24 hour preclitation, trace. Excess of precipitation since Dec. 1, 1.18 inches. Excess of precipitation since Jan. 1,.89 inches. Highest observed wind since 7 a.m., 21 miles per hour from the northwest at 9 a.m. Peak gust since 7 a.m., 32 miles per hour from the northwest at 8:49 a.m. (TABLE) Local Temp., Humidity Time(COLUMN)T.(COLUMN)H. 12 mid.(COLUMN)33(COLUMN)49 1 a.m.(COLUMN)32(COLUMN)49 2 a.m.(COLUMN)32(COLUMN)47 3 a.m.(COLUMN)31(COLUMN)49 4 a.m.(COLUMN)31(COLUMN)51 5 a.m.(COLUMN)31(COLUMN)47 6 a.m.(COLUMN)31(COLUMN)45 7 a.m.(COLUMN)30(COLUMN)45 8 a.m.(COLUMN)30(COLUMN)49 9 a.m.(COLUMN)31(COLUMN)49 10 a.m.(COLUMN)31(COLUMN)47 11 a.m.(COLUMN)32(COLUMN)45 12 noon(COLUMN)33(COLUMN)43 1 p.m.(COLUMN)34(COLUMN)43 2 p.m.(COLUMN)35(COLUMN)44 3 p.m.(COLUMN)35(COLUMN)42 4 p.m.(COLUMN)36(COLUMN)40 5 p.m.(COLUMN)34(COLUMN)40 6 p.m.(COLUMN)33(COLUMN)41 7 p.m.(COLUMN)33(COLUMN)41 8 p.m.(COLUMN)32(COLUMN)43 9 p.m.(COLUMN)31(COLUMN)45 10 p.m.(COLUMN)30(COLUMN)49 11 p.m.(COLUMN)28(COLUMN)49(END TABLE) (TABLE) Temperatures ending 7 p.m. (EST) yesterday City(COLUMN)L.(COLUMN)H. Albany(COLUMN)17(COLUMN)26 Albuquerque(COLUMN)08(COLUMN)35 Amarilo(COLUMN)09(COLUMN)38 Anchorage(COLUMN)33(COLUMN)37 Asheville(COLUMN)19(COLUMN)35 Atlanta(COLUMN)20(COLUMN)40 Atlantic City(COLUMN)27(COLUMN)33 Austin(COLUMN)19(COLUMN)46 baltimore(COLUMN)28(COLUMN)35 Billings(COLUMN)21(COLUMN)31 Birmingham(COLUMN)20(COLUMN)38 Bismarck(COLUMN)09(COLUMN)34 Boise(COLUMN)24(COLUMN)36 Boston(COLUMN)25(COLUMN)29 Brownsville(COLUMN)31(COLUMN)59 Buffalo(COLUMN)15(COLUMN)23 Burlington, Vt.(COLUMN)08(COLUMN)17 Casper(COLUMN)16(COLUMN)26 Charleston, S.C.(COLUMN)37(COLUMN)48 Charleston, W.V.(COLUMN)21(COLUMN)26 Charlotte(COLUMN)26(COLUMN)43 Cheyenne(COLUMN)20(COLUMN)32 Chicago(COLUMN)-08(COLUMN)10 Cincinnatl(COLUMN)08(COLUMN)23 Cleveland(COLUMN)12(COLUMN)71 Columbia, S.C.(COLUMN)32(COLUMN)48 Columbus(COLUMN)11(COLUMN)21 Dal.-Ft. Worth(COLUMN)20(COLUMN)50 Dayton(COLUMN)10(COLUMN)22 Denver(COLUMN)13(COLUMN)35 Des Moines(COLUMN)-02(COLUMN)28 Detroit(COLUMN)07(COLUMN)20 Duluth(COLUMN)-20(COLUMN)07 El Paso(COLUMN)15(COLUMN)36 Evansville(COLUMN)14(COLUMN)28 Fairbanks(COLUMN)01(COLUMN)10 Fargo(COLUMN)-05(COLUMN)13 Flagstaff(COLUMN)-01(COLUMN)30 Great Falls(COLUMN)25(COLUMN)31 Hartford(COLUMN)18(COLUMN)24 Helena(COLUMN)24(COLUMN)33 Honolulu(COLUMN)70(COLUMN)79 Houston(COLUMN)30(COLUMN)48 Indianapolls(COLUMN)10(COLUMN)24 Jackson(COLUMN)20(COLUMN)42 Jacksonville(COLUMN)30(COLUMN)50 Juneau(COLUMN)35(COLUMN)36 Kansas City(COLUMN)12(COLUMN)38 Las Vegas(COLUMN)26(COLUMN)55 Little Rock(COLUMN)17(COLUMN)40 Los Angeles(COLUMN)42(COLUMN)74 Louisville(COLUMN)17(COLUMN)30 Memphis(COLUMN)24(COLUMN)40 Miami Beach(COLUMN)68(COLUMN)77 Midland(COLUMN)15(COLUMN)47 Milwaukee(COLUMN)-08(COLUMN)08 Mpls.-St. Paul(COLUMN)-15(COLUMN)12 Nashville(COLUMN)18(COLUMN)35 New Orleans(COLUMN)32(COLUMN)45 New York(COLUMN)28(COLUMN)30 Norfolk(COLUMN)31(COLUMN)39 North Platte(COLUMN)11(COLUMN)36 Oklaoma City(COLUMN)17(COLUMN)48 Omaha(COLUMN)06(COLUMN)29 Orlando(COLUMN)47(COLUMN)63 Philadelphia(COLUMN)26(COLUMN)33 Phoenix(COLUMN)31(COLUMN)66 Pittsburgh(COLUMN)12(COLUMN)18 Portland, Me.(COLUMN)15(COLUMN)26 Portland, Ore.(COLUMN)36(COLUMN)43 Providence(COLUMN)22(COLUMN)28 Raleigh(COLUMN)26(COLUMN)40 Rapid City(COLUMN)24(COLUMN)36 Reno(COLUMN)23(COLUMN)49 Richmond(COLUMN)27(COLUMN)39 St. Louis(COLUMN)11(COLUMN)31 St. Prbg.-Tampa(COLUMN)45(COLUMN)61 Salt Lake City(COLUMN)25(COLUMN)37 San Antonio(COLUMN)18(COLUMN)45 San Diego(COLUMN)42(COLUMN)73 San Francisco(COLUMN)44(COLUMN)57 San Juan(COLUMN)74(COLUMN)83 St. Ste. Marie(COLUMN)-13(COLUMN)18 Seattle(COLUMN)38(COLUMN)43 Shreveport(COLUMN)17(COLUMN)45 Sioux Falls(COLUMN)-09(COLUMN)28 Spokane(COLUMN)21(COLUMN)26 Syracuse(COLUMN)20(COLUMN)26 Topeka(COLUMN)07(COLUMN)43 Tucson(COLUMN)30(COLUMN)56 Tulsa(COLUMN)18(COLUMN)48 Washington(COLUMN)30(COLUMN)36 Wichita(COLUMN)10(COLUMN)42(END TABLE) (TABLE) Temperatures Abroad Yesterday City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp. Aberdeen(COLUMN)clear(COLUMN)1 p.m.(COLUMN)37 Amsterdam(COLUMN)clear(COLUMN)1 p.m.(COLUMN)48 Ankara(COLUMN)clear(COLUMN)3 p.m.(COLUMN)27 Athens(COLUMN)rain(COLUMN)2 p.m.(COLUMN)52 Auckland(COLUMN)pt. cldy.(COLUMN)midnight(COLUMN)66 Berlin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)45 Birmingham(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)48 Bonn(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)52 Brussels(COLUMN)pt. cldy(COLUMN)1 p.m.(COLUMN)50 Cairo(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)57 Casablanca(COLUMN)clear(COLUMN)midnight(COLUMN)59 Copenhagen(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)34 Dublin(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)48 Geneva(COLUMN)clear(COLUMN)1 p.m.(COLUMN)30 Hong Kong(COLUMN)clear(COLUMN)8 p.m.(COLUMN)70 Jerusalem(COLUMN)clear(COLUMN)2 p.m.(COLUMN)46 Lisbon(COLUMN)cloudy(COLUMN)noon(COLUMN)63 London(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)48 Madrld(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)52 Malta(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)61 Manila(COLUMN)clear(COLUMN)8 p.m.(COLUMN)79 Moscow(COLUMN)snow(COLUMN)3 p.m.(COLUMN)19 New Delhl(COLUMN)clear(COLUMN)5 p.m.(COLUMN)52 Nice(COLUMN)clear(COLUMN)1 p.m.(COLUMN)45 Oslo(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)14 Paris(COLUMN)pt. cldy.(COLUMN)1 p.m.(COLUMN)50 Peking(COLUMN)smoke(COLUMN)8 p.m.(COLUMN)32 Rome(COLUMN)clear(COLUMN)1 p.m.(COLUMN)48 Saigon(COLUMN)cloudy(COLUMN)8 p.m.(COLUMN)77 Sofia(COLUMN)cloudy(COLUMN)2 p.m.(COLUMN)27 Stockholm(COLUMN)cloudy(COLUMN)1 p.m.(COLUMN)30 Todyo(COLUMN)rain(COLUMN)9 p.m.(COLUMN)63 Tunis(COLUMN)clear(COLUMN)1 p.m.(COLUMN)61 Vienna(COLUMN)rain(COLUMN)1 p.m.(COLUMN)43 Warsaw(COLUMN)rain(COLUMN)1 p.m.(COLUMN)32(END TABLE) (TABLE) Temperatures (Western Hemisphere) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)fair(COLUMN)88(COLUMN)72 Barbados(COLUMN)pt. cldy.(COLUMN)86(COLUMN)73 Bermuda(COLUMN)pt. cldy.(COLUMN)77(COLUMN)74 Calgary(COLUMN)cloudy(COLUMN)37(COLUMN)21 Culiacan(COLUMN)fair(COLUMN)79(COLUMN)48 Edmonton(COLUMN)pt. cldy.(COLUMN)37(COLUMN)23 Havana(COLUMN)pt. cldy.(COLUMN)88(COLUMN)72 Kingston(COLUMN)fair(COLUMN)90(COLUMN)73 Montego Bay(COLUMN)fair(COLUMN)86(COLUMN)75 Mexico City(COLUMN)pt. cldy.(COLUMN)72(COLUMN)50 Monterrey(COLUMN)pt. cldy.(COLUMN)47(COLUMN)30 Montreal(COLUMN)snow(COLUMN)25(COLUMN)19 Nassau(COLUMN)pt. cldy.(COLUMN)85(COLUMN)66 Ottawa(COLUMN)cloudy(COLUMN)21(COLUMN)00 Regina(COLUMN)snow(COLUMN)09(COLUMN)-18 St. Kitts(COLUMN)fair(COLUMN)85(COLUMN)74 Toronto(COLUMN)clear(COLUMN)28(COLUMN)19 Vancouver(COLUMN)cloudy(COLUMN)45(COLUMN)32 Vera Cruz(COLUMN)pt. cldy.(COLUMN)81(COLUMN)59 Winnipeg(COLUMN)pt. cldy.(COLUMN)-06(COLUMN)-20(END TABLE)