BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, MAY 29, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
WARMER THAN NORMAL TEMPERATURES CONTINUE
A VERY SUNNY AND PLEASANT DRY LATE MAY DAY TODAY
 
Today will complete one week of above normal temperatures 
with our daily means running between one to as much as 14 
degrees above normal.  The month is now averaging
2.4 degrees warmer than normal. 
 
Today's observations:
 
7 A.M.   
Weather: High thin scattered cirrus clouds 
Temperature: 60F, Dew point: 47F, Wind: WNW at 16G26 kts 
Wind: Peak wind WNW @ 26 kts @ 54 past the hour
Sea-level pressure: 30.18 inches Hg, rising  
Visibility: 60 miles     
6-hour min temp. 53 deg.   
24-hour precip: trace 
BHO SA 1155 250 –SCT 60 221/60/47/3016G26/018/
PK WND 3026/54/ 8/001 51014 10060 20053  
     
10 A.M. 
Weather: Clear, small cumulus forming, cirrus distant W-NW 
Temperature: 68F, Dew point: 47F, Wind: NW at 10 kts
Wind: Direction variable W to N, gust to 21 kts past hour
Sea-level pressure: 30.19 inches Hg, rising slightly
Visibility: 55 miles, light distant haze   
BHO SA 1455 CLR 55 224/68/47/3110/019/ CUFRA/SML CU 
FRMG ALQDS CI DSNT W-NW LGT DSNT HZ GST 21 KTS PST HR WND 27V35/ 
8/101 50003
 
1 P.M. 
Weather: Clear, small cumulus, cirrus distant SW-NW 
Temperature: 74F, Dew point: 47F, Wind: SW at 10G22 kts
Wind: direction variability WSW-NW
Sea-level pressure: 30.17 inches Hg, falling
Visibility: 55 miles, light distant haze  
BHO SA 1755 CLR 55 216/74/47/2808G17/017/ CUFRA/SML CU ALQDS 
CI DSNT SW-NW LGT DSNT HZ WND 24V31 GST TO 20 KTS PST HR/ 
8/101 56008 10074 20060 
6-hour max. temp. 74 deg.
 
WEATHER SUMMARY FOR MONDAY, MAY 28, MEMORIAL DAY 
 
TEMPERATURE (DEGREES F)
MAX.....82    NORMAL.....71 
MIN.....58    NORMAL.....51
MEAN....70    NORMAL.....61
DEPARTURE FROM 30-YEAR NORMAL..........+ 9
TOTAL DEPARTURE FOR THE MONTH..........+74 (+2.4 DEGREES/DAY)
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............0  DEPARTURE.........-6
TOTAL HEATING UNITS FOR THE MONTH..........212  DEPARTURE........-44  
TOTAL HEATING UNITS FOR THE SEASON........5828  DEPARTURE.......-454
TOTAL HEATING UNITS LAST SEASON TO DATE...5711  DIFFERENCE......+117 

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............33 WNW AT 5:49 P.M. 
                   AEROVANE.............33 WNW AT 6:14 P.M. 
                   ASOS.................32 NW  AT 5:49 P.M.  ** 
                   DAVIS................33 W   AT 4:55 P.M.   
FASTEST MILE FOR YESTERDAY..............24 WNW AT 5:51 P.M.        
MAXIMUM 2-MINUTE ASOS AVERAGE...........24 NW  AT 5:51 P.M.  **  
MAXIMUM 2-MINUTE DAVIS AVERAGE..........27 WNW AT 5:51 P.M.     
AVERAGE WIND SPEED AND DIRECTION........13.4 WSW 
                   ASOS.................13.1 **  
                   DAVIS................13.6 WSW [240 deg]
** NEW ASOS ULTRASONIC WIND SYSTEM INSTALLED 25 MAY
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....trace DEPARTURE.....-0.12
                         ASOS..............0.00  
TOTAL PRECIPITATION FOR THE MONTH..........3.71  DEPARTURE.....+0.30 
                         ASOS..............3.64    
TOTAL PRECIPITATION FOR THE YEAR..........24.13  DEPARTURE.....+2.77
                         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 71/46/59/0/0/0/800/90       25 SSE  
5/23 74/47/61/0/0/757/85         30 SSE 
5/24 86/50/68/+8/0/0/828/93      25 WSW
5/25 91/66/79/+19/0/0/769/86     24 W
5/26 85/66/76/+16/0/0/.../..     30 W  
5/27 73/58/66/+5/0/0/.../..      22 SSE
5/28 82/58/70/+9/T/0/476/53      33 WNW
 
5/29 morning low temp. 53 deg; normal now 51 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.
5/25 Record high maximum temperature, 91; previous 89 in 1981.
5/25 Record high minimum temperature, 66; previous 65 in 1991.
5/26 Record high minimum temperature, 66; previous 63 in 1981.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MAY 29
HIGH 93F IN 1919
LOW 35F IN 1902
PRECIP 1.63 INS 1990
PEAK GUST 55e MPH NNW IN 1943, WNW IN 1945
 
RECORDS FOR MAY 30
HIGH 93F IN 1929
LOW 39F IN 1949,1961
PRECIP 1.47 INS 1948
PEAK GUST 61e MPH NW IN 1945
 
TODAY'S REPORT PREPARED By: Robert Skilling