BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, APRIL 29, 2008  
ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED
 
RAINFALL TOTAL REACHES 1.54 INCHES BY 2 P.M. TODAY
 
The rain that began at mid-morning yesterday continued
throughout the afternoon and during last night, and it had
totaled 1.25 inches by 8 a.m. today EDT.  An additional
0.29 inch was measured for the 6 hours ending 2 p.m.
 
Temperatures reached nearly 60 degrees at mid-morning 
before a wind shift from southeast to west on a cold 
frontal passage sent the thermometer down to the upper
40's early this afternoon with some light rain still 
continuing behind the front. 
 
Today's observations:
 
8 A.M. EDT
Weather: Obscurement with heavy fog, light rain occurring  
Temperature: 55F, Dew point: 55F,  Wind: SE at 6 kts  
Sea-level pressure: 29.61 inches Hg, falling 
Visibility: 1/16 mile
6-hour min temp: 55F 
24-hour rainfall: 1.25 ins. 
BHO SA 1155 W2 X 1/16R-F 027/55/55/1406/961/ 8//// 
57018 ASOS 60048 MANUAL 6XXX/ ASOS 70130 MANUAL 70125
10056 20055
 
2 P.M. EDT
Weather: Low overcast stratus fractus, light rain occurring,
briefly partial obscured stratus drifting over summit past hour
Temperature: 49F, Dew point: 48F,  Wind: WNW at 14G22 kts  
Sea-level pressure: 29.55 inches Hg, rising
Visibility: 5 miles, 10 miles N-E briefly 1 variable 2 miles 
with stratus drifting over summit past hour
6-hour max temp: 59F 
6-hour rainfall: 0.29 in. 
BHO SA 1755 E3 OVC 5R-F 006/49/48/2914G22/955/ CDNS VRBL BRFLY 1V2F 
STRA DRFTG OVR SMT VSBY N-E BRFLY 10 R- OCNL MDT PST HR/ 8/7// 55004 
ASOS 60030 MANUAL 6029/ 10059 20049
 
WEATHER SUMMARY FOR MONDAY, APRIL 28
 
TEMPERATURE (DEGREES F)
MAX.....57    NORMAL.....60
MIN.....39    NORMAL.....41
MEAN....48    NORMAL.....51
DEPARTURE FROM 30-YEAR NORMAL............-3  
TOTAL DEPARTURE FOR THE MONTH...........+97 [+3.3 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............17  DEPARTURE........+4
TOTAL HEATING UNITS FOR THE MONTH...........439  DEPARTURE.......-94 
TOTAL HEATING UNITS FOR THE SEASON.........5576  DEPARTURE......-422
TOTAL HEATING UNITS LAST SEASON TO DATE....5588  DIFFERENCE......-12
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............39 SE AT  11:28 P.M.* 
                   AEROVANE.............39 SE AT  11:28 P.M 
                   ASOS.................38 E  AT  12:44 P.M. 
                   DAVIS................38 E  AT  12:45 P.M.   
FASTEST MILE FOR YESTERDAY..............25 SE AT  11:32 P.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE...........25 E  AT  12:45 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE..........27 E  AT  12:45 P.M.  
                   AVERAGE............14.4 E 
                   ASOS...............13.1        
                   DAVIS..............14.1 ESE [110 deg]   
* last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....1.25   DEPARTURE......+1.14  
                         ASOS..............1.30
TOTAL PRECIPITATION FOR THE MONTH..........2.79   DEPARTURE......-1.27
                         ASOS..............2.98 
TOTAL PRECIPITATION FOR THE YEAR..........20.39   DEPARTURE......+1.56
                         ASOS.............22.86 #
# Includes erroneous ASOS precipitation data on 2/13/08.
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M.........0.0    DEPARTURE......-0.1
TOTAL SNOWFALL FOR APRIL...................0.0    DEPARTURE......-2.9
TOTAL SNOWFALL FOR THE SEASON.............66.5    DEPARTURE......+6.6
 
PRELIMINARY CLIMATE SUMMARY FOR APRIL 2008 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available, records not finalized
 
4/1  59/50/55/+14/0.20/0/000/00    54 S    Aero 58 MPH SSW
4/2  47/31/39/-3/0/0/745/97        52 W    Aero 51 MPH W
4/3  52/27/40/-2/0/0/648/84        37 SSW 
4/4  43/34/39/-3/0.71/0/000/00     35 E
4/5  51/37/44/+1/0.06/0/093/12     21 W
4/6  40/36/38/-5/0.09/0/000/00     36 NE 
4/7  39/34/37/-6/0/0/172/22        35 NE    Aero 36 MPH NE
4/8  47/30/39/-5/0/0/627/80        22 NE
4/9  59/33/47/+3/0/0/150/19        29 S    
4/10 71/44/58/+14/T/0/624/79       34 W
4/11 54/40/47/+2/0.03/096/13       24 SE 
4/12 70/43/57/+12/0.43/0/342/43    40 WNW   Aero 42 WNW
4/13 47/34/41/-4/T/0/104/13        30 NW 
4/14 53/30/42/-4/0/0/625/78        29 NW  
4/15 57/33/45/-1/0/0/803/100       23 SSE 
4/16 64/39/52/+6/0/0/806/100       24 SSE
4/17 64/14/53/+6/0/0/810/100       23 NE
4/18 70/42/56/+9/0/0/723/89        23 NW
4/19 70/46/58/+11/0/0/799/98       22 NE 
4/20 67/42/55/+7/0/0/760/93        25 ESE
4/21 61/41/51/+3/0/0/615/75        17 E
4/22 74/45/60/+11/0/0/789/96       23 S
4/23 83/50/67/+18/0/0/784/95       25 SW 
4/24 72/53/63/+14/0/0/802/97       38 WNW   Aero 39 WNW   
4/25 71/46/59/+9/0/0/557/67        25 E
4/26 55/42/49/-1/T/0/716/86        27 ENE 
4/27 49/40/45/-5/0.02/0/000/00     16 ESE 
4/28 57/39/48/-3/../0/008/01       39 SE    Aero 39 SE
 
4/29 morning low temp. 55F; our normal low is now 41F
 
NEW DAILY RECORDS FOR APRIL 2008
None to date.
 
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 IN 1923
SNOWFALL 1.0 IN. IN 1987
PEAK GUST 54 MPH WSW IN 1981
 
RECORDS FOR APRIL 30
HIGH 86 IN 1942
LOW 30 IN 1931
PRECIP 1.41 IN 1991
SNOWFALL 0.3 IN. IN 1909
PEAK GUST 64e MPH NW IN 1978
 
TODAY'S REPORT PREPARED By: Robert Skilling