BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, MAY 3, 2009 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.  
Weather: Scattered altocumulus; thin overcast cirrus
Temperature: 53F, Dew point: 31F, Wind: WSW at 4 kt; Wind light
Sea-level pressure: 30.04 inches Hg, rising
Visibility: 50 miles
6-hour minimum temp: 51F
24-hour precipitation: None
BHO SA 1155 150 SCT 250 OVC 50 173/53/31/2404/004/
FEW BINOVC ALQDS WND LGT/ 8/077 53017 10056 20051
 
10 A.M.  
Weather: Scattered altocumulus; overcast cirrus
Temperature: 62F, Dew point: 29F, Wind: SE at 6 kts; Light and Variable
Sea-level pressure: 30.05 inches Hg, rising
Visibility: 45 miles; 25 miles NE
BHO SA 1455 100 SCT 180 OVC 45 176/62/29/1306/005/
VSBY NE 25 WND L/V/ 8/077 53003
 
1 P.M.  
Weather: Scattered stratus; overcast altostratus
Temperature: 63F, Dew point: 30F, Wind: SSE at 6 kt
Sea-level pressure: 30.01 inches Hg, falling
Visibility: 40 miles
6-hour maximum temp: 64F 
BHO SA 1755 80 SCT 150 OVC 40 163/63/30/1606/001/
VSBY NE 25 SUN DMLY VSBL WND LGT/ 8/81/ 58013 10064 20053
 
 
WEATHER SUMMARY FOR SATURDAY, MAY 2
 
TEMPERATURE (DEGREES F)
MAX.....68    NORMAL.....62
MIN.....52    NORMAL.....43
MEAN....60    NORMAL.....52
 
DEPARTURE FROM 30-YEAR NORMAL...........+8
TOTAL DEPARTURE FOR THE MONTH..........+15 [+7.3 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............5  DEPARTURE.......-8
TOTAL HEATING UNITS FOR THE MONTH............11  DEPARTURE......-15
TOTAL HEATING UNITS FOR THE SEASON.........5907  DEPARTURE.....-145
TOTAL HEATING UNITS LAST SEASON TO DATE....5648  DIFFERENCE....+259
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............32 WNW AT 4:15 A.M.
                   AEROVANE.............31 WNW AT 4:13 A.M.
                   ASOS.................31 NNW AT 4:16 A.M.
                   DAVIS................33 WNW AT 4:15 A.M.
FASTEST MILE FOR YESTERDAY..............26 WNW AT 4:15 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...........21 NNW AT 4:18 A.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE..........24 WNW AT 4:15 A.M.
AVERAGE WIND SPEED AND DIRECTION......10.8 W
                   ASOS...............10.3
                   DAVIS..............11.2 WSW [244 DEG]
* Last of several occurrences.
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE....-0.13
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........0.05  DEPARTURE....-0.21
                         ASOS..............0.05 
TOTAL PRECIPITATION FOR THE YEAR..........14.66  DEPARTURE....-3.55
                         ASOS.............15.73  
 
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..............78.9  DEPARTURE.....18.8
 
 
PRELIMINARY CLIMATE SUMMARY FOR APRIL 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
 
4/1  45/31/38/-3/0.13/0/015/02       24 SE    
4/2  52/39/46/+4/0.02/0/000/00       20 SSE       
4/3  58/45/52/+10/0.70//000/00       39 SSE   AERO 38 MPH SSE TSTM
4/4  51/38/45/+3/0.01/0/015/02       48 WSW   AERO 48 MPH WSW 
4/5  58/37/48/+5/0/0/551/71          40 W     AERO 37 MPH W
4/6  55/38/47/+4/1.42/0/047/006      42 SE    AERO 40 MPH SE  TSTM 
4/7  50/34/42/-1/T/0/109/14          36 WSW   AERO 35 MPH WSW
4/8  45/32/39/-5/0/0/149/19          33 SW    AERO 31 MPH SW
4/9  60/34/47/+3/0/0/692/88          36 SSW   AERO 33 MPH SSW
4/10 65/41/53/+9/0.18/0/544/69       37 SSW   AERO 35 MPH SSW 
4/11 44/33/39/-6/0.77/0.2/000/00     35 N     AERO 30 MPH N
4/12 43/29/36/-9/0/0/541/68          45 NW    AERO 43 MPH WNW
4/13 52/29/41/-4/0/0/734/92          38 W     AERO 35 MPH W
4/14 58/37/48/+2/0/0/696/87          25 E     
4/15 49/36/43/-3/0/0/650/81          35 NE    AERO 31 MPH NE
4/16 50/34/42/-4/0/0/806/100         29 NNE  
4/17 69/35/52/+5/0/0/695/86          37 W     AERO 33 MPH W
4/18 64/44/54/+7/0.05/0/170/21       28 W  
4/19 52/38/45/-2/0.03/0/773/95       33 NNE   AERO 28 MPH NNE
4/20 51/36/44/-4/0.10/0/196/24       43 E     AERO 39 MPH E
4/21 58/42/50/+2/0.95/0/000/00       43 E     AERO 43 MPH S
4/22 62/45/54/+5/0.16/0/296/36       28 S    
4/23 56/40/48/-1/0.01/0/668/81       43 W
4/24 70/40/55/+6/0/0/810/98          30 W
4/25 83/49/66/+16/T/0/647/78         29 S
4/26 88/56/72/+22/0/0/574/69         33 NE
4/27 72/49/61/+11/0/0/768/92         29 S
4/28 92/57/75/+24/0/0/704/84         37 SSW   AERO 36 MPH S
4/29 63/44/54/+3/T/0/823/98          35 NW    AERO 30 MPH NW TSTM
4/30 67/41/54/+2/T/0/717/85          37 S
 
PRELIMINARY CLIMATE SUMMARY FOR MAY 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
 
5/1 64/53/59/+7/T/0/.../..          37 SSW   AERO 37 MPH SSW
5/2 68/52/60/+8/../../.../..        32 WNW
 
 
NEW DAILY RECORDS FOR APRIL 2009...
New record high maximum temperature for April 25 of 83F
surpasses 80F in 1942.
New record high maximum temperature for April 26 of 88F
surpasses 83F in 1908.
New record high minimum temperature for April 26 of 56F
surpasses 55F in 1985.
Maximum temperature of 92F for April 28 equals record
high maximum of 92F in 1990.
Minimum temperature of 57F for April 28 equals record
high minimum of 57F in 1935. 
 
NEW DAILY RECORDS FOR MAY 2009...
NONE
 
DAILY EXTREMES
 
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MAY 3
HIGH 92F IN 2001
LOW 31F IN 1888
PRECIP 2.25 INS IN 1900
SNOWFALL TRACE IN 1908, 1985
PEAK GUST 71 MPH W IN 2002
 
RECORDS FOR MAY 4
HIGH 90F IN 2001
LOW 27F IN 1911 (RECORD FOR MAY)
PRECIP 1.92 INCHES IN 1893
SNOWFALL 0.1 INCHES IN 1920
PEAK GUST 60 MPH NW IN 1966
 
TODAY'S REPORT PREPARED BY: Andrew Hoell