BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, MARCH 21, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME COOL WITH LIGHT WINDS AND FULL SUNSHINE TODAY... It's another sunny day today with only a few distant small cumulus clouds observed at mid-morning. After a cold start with 23 on the summit and 15 at nearby, low-lying Norwood Airport, the temperature has climbed to the low 40s as of early afternoon. This is well below the average for the date, and a cool Friday has turned the month back down to near average temperature. Very good visibility near 70 miles earlier today has dropped by afternoon to 55 miles with some light haze. Today's observations: 7 A.M. Weather: Clear (no clouds) Temperature: 25F, Dew point: 13F, Wind: NNW at 8 kts, Sea-level pressure: 30.52 inches Hg, rising Visibility: 70 miles 6-hour minimum temperature: 23F 24-hour precipitation: 0.00 in. BHO SA 1155 CLR 70 336/25/13/3408/052/ LINE DNS K ABV HRZN SW-NNW THN K LYR ALG HRZN NW-N WND LGT/ 8/000 51024 10025 20023 10 A.M. Weather: Clear, few small cumulus distant SE Temperature: 35F, Dew point: 15F, Wind: NNE at 8 kts, Wind: light and variable Sea-level pressure: 30.55 inches Hg, rising Visibility: 70 miles BHO SA 1455 CLR 70 344/35/15/0308/055/ FEW SML CU DSNT SE WND LGT AND VRB/ 8/100 50008 1 P.M. Weather: Clear (no clouds) Temperature: 40F, Dew point: 16F, Wind: NW at 6 kts Wind: light and variable Sea-level pressure: 30.50 inches Hg, falling Visibility: 55 miles, light haze 6-hour maximum temperature: 41F BHO SA 1755 CLR 55 329/40/16/3006/050/ LGT HZ WND LGT AND VRB/ 8/000 58015 10041 20025 WEATHER SUMMARY FOR FRIDAY, MARCH 20, 2009 TEMPERATURE (DEGREES F) MAX.....36 NORMAL.....46 MIN.....25 NORMAL.....29 MEAN....31 NORMAL.....38 DEPARTURE FROM 30-YEAR NORMAL..................-7 TOTAL DEPARTURE FOR THE MONTH..................+4 [0.0 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............34 DEPARTURE.........+6 TOTAL HEATING UNITS FOR THE MONTH............604 DEPARTURE.........-8 TOTAL HEATING UNITS FOR THE SEASON..........5131 DEPARTURE........-51 TOTAL HEATING UNITS LAST SEASON TO DATE.....4816 DIFFERENCE......+315 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............26 NNE AT 8:01 A.M. AEROVANE.............26 NNE AT 6:26 A.M. ASOS.................28 ENE AT 8:31 A.M. DAVIS................32 NNW AT 8:00 A.M. FASTEST MILE FOR YESTERDAY..............19 NNE AT 8:01 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........20 NNE AT 8:01 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........22 N AT 8:01 A.M. AVERAGE............10.8 NE ASOS................9.7 DAVIS..............10.9 NNE [25 DEGREES] * last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.00 DEPARTURE.........-0.16 ASOS...............0.00 TOTAL PRECIPITATION FOR THE MONTH...........2.45 DEPARTURE.........-0.62 * ASOS...............2.39 TOTAL PRECIPITATION FOR THE YEAR............8.98 DEPARTURE.........-2.93 ASOS..............10.01 # # Includes erroneous ASOS precipitation data on 1/1/09, 1/2/09 and 2/27/09. * Monthly precipitation departure corrected from value reported yesterday. SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.........-0.4 TOTAL SNOWFALL FOR THE MONTH...............13.4 DEPARTURE.........+4.8 TOTAL SNOWFALL FOR THE SEASON..............78.7 DEPARTURE........+24.7 PRELIMINARY CLIMATE SUMMARY FOR MARCH 2009 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 3/1 28/21/25/-7/0.26/1.9/000/00 38 NNE 3/2 22/15/19/-13/1.21/8.2/000/00 40 NNE AERO 37 MPH NNE 3/3 25/11/18/-14/0.01/0.1/640/94 33 NW 3/4 30/6/18/-14/0/0/684/100 31 WNW 3/5 39/16/28/-5/0/0/659/96 25 WSW 3/6 49/30/40/+7/T/0/152/22 43 S AERO 41 MPH S 3/7 60/42/51/+18/0.06/0/429/62 37 S 3/8 57/42/50/+16/0/0/445/64 39 WNW AERO 40 MPH WNW 3/9 42/28/35/+1/0.72/3.2/000/00 33 N 3/10 42/26/34/0/0.02/0/470/67 23 SSE 3/11 50/33/42/+7/0.13/0/000/00 51 W 3/12 39/25/32/-3/0/0/685/97 44 W AERO 45 MPH W 3/13 37/19/28/-7/0/0/660/93 26 SSE 3/14 50/25/38/+2/0/0/613/86 24 SSW 3/15 59/34/47/+11/0/0/686/96 17 SSW 3/16 42/29/36/0/0/0/000/00 30 NE 3/17 47/28/38/0/+1/671/93 21 SSW 3/18 59/31/45/+8/0/0/448/62 37 SSW AERO 40 MPH S 3/19 45/36/41/+4/0.04/0/000/00 22 S 3/20 36/25/31/-7/0/0/.../.. 26 NNE 3/21 morning low temp: 23F; our normal low now 29F NEW DAILY RECORDS FOR MARCH 2009... 3/2: DAILY SNOWFALL 8.2 INS. SURPASSES PREVIOUS RECORD OF 7.1 INS. IN 1948 3/7: DAILY MINIMUM 42 TIES RECORD HIGH MINIMUM FOR DATE PREVIOUSLY SET IN 1974 AND 1987 3/8: DAILY MINIMUM 42 TIES RECORD HIGH MINIMUM FOR DATE PREVIOUSLY SET IN 1995 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MARCH 21 HIGH 81 IN 1921 LOW 2 IN 1885 PRECIP 2.67 INS. IN 1974 SNOWFALL 10.6 INS. IN 1958 PEAK GUST 72 MPH NE IN 1958 RECORDS FOR MARCH 22 HIGH 71 IN 1948 LOW 3 IN 1885 PRE 3.48 INS. IN 2001 SNOW 8.7 INS. 1967 WIND 84e MPH E IN 1977 TODAY'S REPORT PREPARED BY: Mike Iacono