BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA   DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, MAY 22, 2007   ALL TIMES ARE IN EASTERN STANDARD TIME   CLEAR AND SUNNY WITH WARMER TEMPERATURES TODAY MAY TEMPERATURES NOW JUST SLIGHTLY WARMER THAN AVERAGE   A beautiful mid-late May day today includes lots of bright sunshine with just a few clouds, light winds, warmer temp- eratures and excellent visibility up to 60 to 75 miles.  Temperatures will likely average out very close to the normal for this date.     After six consecutive days of cooler than normal temperatures our monthly average has now dropped to only one half a degree above the average.    Today's observations:   7 A.M.   Weather: High thin scattered cirrus Temperature: 56F, Dew point: 35F, Wind: NNW at 05 kts Sea-level pressure: 30.32 inches Hg, rising   Visibility: 60 miles, 70 miles northwest   6- hourly min temp. 46 deg.  BHO SA 1155 300 –SCT 60 269/56/35/3405/032/ THN K LYR ALG HRZN NNW-ENE AND SE-SW BLO INVSN VSBY NW 70 ABV INVSN/ 8/001 51016 10056 20046   10 A.M. Weather: Clear, few small cumulus and few cirrus Temperature: 64F, Dew point: 30F, Wind: W at 06 kts Wind: light and variable Sea-level pressure: 30.35 inches Hg, rising    Visibility: 70 miles   BHO SA 1455 CLR 70 277/64/30/2806/035/ FEW SML CUFRA FEW CI WND LGT VRBL/ 8/101 51008   1 P.M. Weather: High thin scattered, and small Cu ESE-SW    Temperature: 68F, Dew point: 30F, Wind: N at 08 kts Wind: direction NNW variable to ENE  Sea-level pressure: 30.34 inches Hg, steady    Visibility: 70 miles BHO SA 1755 300 –SCT 70 274/68/30/0108/034/ SML CU ESE-SW WND 34V07/ SEABREEZE BEGAN 35/ 8/101 55003 10069 20056   WEATHER SUMMARY FOR MONDAY, MAY 21    TEMPERATURE (DEGREES F) MAX.....63    NORMAL.....69 MIN.....46    NORMAL.....49 MEAN....55    NORMAL.....59 DEPARTURE FROM 30-YEAR NORMAL..........- 4 TOTAL DEPARTURE FOR THE MONTH..........+15 (+0.5 DEGREES/DAY)   HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY...........10  DEPARTURE........+ 3 TOTAL HEATING UNITS FOR THE MONTH..........202  DEPARTURE........-10  TOTAL HEATING UNITS FOR THE SEASON........5818  DEPARTURE.......-420 TOTAL HEATING UNITS LAST SEASON TO DATE...5673  DIFFERENCE......+143    PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............29 WNW AT 7:02 A.M. *                     AEROVANE.............28 WNW AT 6:25 A.M. *                    ASOS.................29 WNW AT 6:25 A.M.                     DAVIS................32 WNW AT 6:25 A.M.  FASTEST MILE FOR YESTERDAY..............20 NW  AT 8:42 A.M.  MAXIMUM 2-MINUTE ASOS AVERAGE...........22 WNW AT 5:59 A.M.  MAXIMUM 2-MINUTE DAVIS AVERAGE..........23 WNW AT 5:59 A.M.   AVERAGE WIND SPEED AND DIRECTION........11.9 WNW                    ASOS.................12.3                    DAVIS................12.5 WNW [300 deg] * last of several occurrences...   PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE.....-0.12                          ASOS..............0.00  TOTAL PRECIPITATION FOR THE MONTH..........3.71  DEPARTURE.....+1.14                          ASOS..............3.64    TOTAL PRECIPITATION FOR THE YEAR..........24.13  DEPARTURE.....+3.51                          ASOS.............23.61      SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.......0.0 TOTAL SNOWFALL FOR THE MONTH................0.0  DEPARTURE......-0.1 TOTAL SNOWFALL FOR THE SEASON..............27.6  DEPARTURE.....-32.5      PRELIMINARY CLIMATE SUMMARY FOR MAY 2007......CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST   AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available   5/1  67/44/56/+4/0/0/624/74      33 NW 5/2  64/45/55/+3/0.06/0/381/45   36 NW    Aero 33 MPH WNW 5/3  67/42/55/+2/0/0/849/100     38 W     Aero 37 MPH W 5/4  66/44/55/+2/0/0/842/99      39 WNW   Aero 40 MPH WNW 5/5  65/45/55/+2/0/0/384/45      33 N  5/6  51/42/47/-7/T/0/514/60      36 N     Aero 33 MPH N 5/7  68/39/54/0/0/0/798/93       25 S 5/8  77/43/60/+6/0/0/851/99      33 S     Aero 31 MPH S 5/9  85/54/70/+15/0/0/707/92     30 S 5/10 85/60/73/+18/0/0/692/80     29 S     Aero 27 MPH S 5/11 74/60/67/+12/0.02/0/355/41  23 S     TSTM A.M.  5/12 63/47/55/-1/0.02/0/469/54   32 NE    5/13 65/46/56/0/T/0/775/89       33 WNW   Aero 33 MPH WNW 5/14 73/43/58/+1/0/0/822/94      30 SSW 5/15 80/50/65/+8/0.01/0/210/24   30 S     TSTM evening   5/16 66/44/55/-2/0.54/0/527/60   40 NW    TSTM P.M.  5/17 50/42/46/-11/0.01/0/009/01  28 NE  5/18 42/39/41/-17/1.93/0/000/00  37 NNE 5/19 51/40/46/-12/0.71/0/000/00  25 NNW 5/20 59/49/54/-4/0.41/0/035/04   30 W     TSTM P.M.  5/21 63/46/55/-4/0/0/693/78      29 WNW   5/22 morning low temp. 46 deg; normal now 49 deg.      NEW DAILY RECORDS FOR MAY:   5/18 Record low maximum temperature, 42, previous 48 in 1895 and 1956. 5/18 Record daily precipitation, 1.93, previous 1.58 inches in 2002.   DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR MAY 22 HIGH 93F IN 1911 LOW 35F IN 1907 PRECIP 3.75 INCHES IN 1920 PEAK GUST 49e MPH SSW IN 1947   RECORDS FOR MAY 23 HIGH 92F IN 1964,1992 LOW 38F IN 1976 PRECIP 0.97 INS IN 1979 PEAK GUST 49e MPH W IN 1945   TODAY'S REPORT PREPARED By: Robert Skilling