BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, APRIL 29, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 

Today's observations:
 
7 A.M.   
Weather: Obscured with fog
Temperature: 46F, Dew point: 46F, Wind: NW at 8 kt   
Sea-level pressure: 29.75 inches Hg, rising 
Visibility: 1/2 of a mile 
6-hour min. 46F   
24-hour rainfall: 0.12 inches   
BHO SA 1155 W2 X1 1/2F 074/46/46/3208/975/ 
8//// 53014 ASOS 60002 MANUAL 70012 10049 20046
 
10 A.M.
Weather: Overcast with fog 
Temperature: 47F, Dew point: 46F, Wind: N at 7 kt 
Sea-level pressure: 29.77 inches Hg, rising 
Visibility: 1/2 of a mile
BHO SA 1455 5 OVC 1/2F 083/47/46/0107/977/ 8/4// 51009
 

WEATHER SUMMARY FOR SATURDAY, APRIL 28
 
TEMPERATURE (DEGREES F)
MAX.....68    NORMAL.....60 
MIN.....43    NORMAL.....41
MEAN....56    NORMAL.....51
DEPARTURE FROM 30-YEAR NORMAL...........+5
TOTAL DEPARTURE FOR THE MONTH..........-58 (-1.9 DEGREES/DAY) 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY...........9   DEPARTURE.........-5
TOTAL HEATING UNITS FOR THE MONTH.........593   DEPARTURE........+59 
TOTAL HEATING UNITS FOR THE SEASON.......5587   DEPARTURE.......-411
TOTAL HEATING UNITS LAST SEASON TO DATE..5386   DIFFERENCE......+201
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............17  S   AT 6:12 P.M.
                   AEROVANE.............18  SSE AT 5:13 P.M. 
                   ASOS.................16  S   AT 6:12 P.M.
                   DAVIS................18  ESE
FASTEST MILE FOR YESTERDAY..............12  S   AT 6:13 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...........14  S   AT 6:13 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..........14  SSW
AVERAGE WIND SPEED AND DIRECTION........4.5 SSW  
                    ASOS................4.5    
                    DAVIS...............4.0 S [169 degrees] 
* Last of several occurrences.
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.12  DEPARTURE.....-0.01
                         ASOS..............0.12
TOTAL PRECIPITATION FOR THE MONTH..........8.62  DEPARTURE.....+4.56  
                         ASOS..............8.28    
TOTAL PRECIPITATION FOR THE YEAR..........20.36  DEPARTURE.....+2.67
                         ASOS.............19.92   
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE......-0.1
TOTAL SNOWFALL FOR THE MONTH................0.2  DEPARTURE......-2.7 
TOTAL SNOWFALL FOR THE SEASON..............27.6  DEPARTURE.....-32.2  
    
PRELIMINARY CLIMATE SUMMARY FOR APRIL 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
 
4/1  59/33/46/+5/0.42/0/511/67       30 S
4/2  39/35/37/-5/0.33/0/000/00       27 E
4/3  41/32/37/-5/0.04/0/000/00       28 ENE
4/4  36/32/34/-8/0.90/0.2/000/00     38 E
4/5  43/26/35/-8/0.21/T/163/21       36 WSW
4/6  39/23/31/-12/0/0/590/76         36 WSW
4/7  40/26/33/-10/0/0/405/52         35 W
4/8  40/25/33/-11/0/0/619/79         44 W      Aero 42 MPH W
4/9  50/30/40/-4/0/0/746/95          36 W
4/10 43/30/37/-7/0/0/158/20          28 W 
4/11 51/28/40/-5/0/0/712/90          22 SSE
4/12 39/32/36/-9/0.89/T/000/00       42 E      Aero 40 MPH E
4/13 47/31/39/-6/0/0/096/12          41 W      Aero 42 MPH W
4/14 52/35/44/-2/0/0/392/49          37 W
4/15 44/35/40/-6/1.75/T/000/00       66 E      Aero 64 MPH E  
4/16 50/40/45/-1/1.56/0/000/00       73 E      Aero 73 MPH E 
4/17 40/35/38/-9/0.69/T/000/00       54 NNE    Aero 53 MPH NNE
4/18 39/36/38/-9/0.37/0/000/00       43 N
4/19 49/36/43/-4/0.02/T/285/35       38 NE     Aero 35 MPH NE 
4/20 57/36/47/-1/0/0/815/100         31 N
4/21 74/45/60/+12/0/0/753/92         24 NW
4/22 75/50/63/+14/0/0/779/95         31 SSE     
4/23 85/49/67/+18/0/0/675/82         42 S      Davis 45 MPH S 
4/24 73/50/62/+13/0/0/586/71         39 W      Aero  41 MPH W
4/25 58/43/51/+1/0.23/0/083/10       27 WNW 
4/26 62/39/51/+1/0/0/.../..          30 SSE    Aero  28 SSE
4/27 48/42/45/-5/1.09/0/.../..       25 E
4/28 68/43/56/+5/.../0/.../..        17 S  
 

NEW DAILY RECORDS FOR APRIL SO FAR....
 
4/15 - NEW RECORD HIGH PEAK WIND GUST FOR THIS DATE OF 66 MPH E; the previous
record was 59 mph estimated from the S in 1946 and measured from the S in 1980.
NEW RECORD DAILY RAINFALL OF 1.75 INS.; previous record 1.29 ins. in 1990.
 
4/16 - NEW RECORD HIGH PEAK WIND GUST OF 73 MPH E; the previous record for this
date was 63 mph SSE in 1996.       
 
4/23 - EQUALED RECORD HIGH MAXIMUM TEMPERATURE OF 85 DEGREES set in 1908.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR APRIL 29
HIGH 85 IN 1974
LOW  26 IN 1909
PRECIP 1.65 INCHES IN 1923
SNOWFALL 1.0 INCHS IN 1987
PEAK GUST 54 MPH WSW IN 1981
 
RECORDS FOR APRIL 30
HIGH 86 IN 1942
LOW 30 IN 1931
PRECIP 1.41 INCHES IN 1991
SNOWFALL 0.3 INCHES IN 1909
PEAK GUST 64e MPH NW IN 1978

TODAY'S REPORT By: Andrew Hoell