BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, MAY 10, 2009 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.  
Weather: Scattered stratocumulus
Temperature: 56F, Dew point: 43F, Wind: W at 26G38 kt
Sea-level pressure: 29.60 inches Hg, rising
Visibility: 50 miles
6-hour minimum temp: 54F
24-hour precipitation: 0.13 inches
BHO SA 1155 30 SCT 50 025/56/43/2726G38/960/
PK WND 2738/1146/ 8/400 51031 70013 10058 20054
 
10 A.M.  
Weather: Scattered stratocumulus; scattered cirrus
Temperature: 59F, Dew point: 43F, Wind: W at 28G38 kt
Sea-level pressure: 29.66 inches Hg, rising
Visibility: 50 miles
BHO SA 1455 30 SCT 200 SCT 50 045/59/43/2728G38/966/
PK WND 2738/1441/ 8/408 51020
 
1 P.M.  
Weather: Scattered stratocumulus
Temperature: 64F, Dew point: 38F, Wind: W at 22G34 kt
Sea-level pressure: 29.68 inches Hg, rising
Visibility: 50 miles
6-hour maximum temp: 64F  
BHO SA 1755 30 SCT 50 051/64/38/2722G34/968/
PK WND 2740/1712/ 8/400 50006 10064 20056
 
WEATHER SUMMARY FOR SATURDAY, MAY 9
 
TEMPERATURE (DEGREES F)
MAX.....71    NORMAL.....65
MIN.....55    NORMAL.....45
MEAN....63    NORMAL.....55
 
DEPARTURE FROM 30-YEAR NORMAL...........+8
TOTAL DEPARTURE FOR THE MONTH..........+38 [+4.0 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............2  DEPARTURE.......-9
TOTAL HEATING UNITS FOR THE MONTH............67  DEPARTURE......-41
TOTAL HEATING UNITS FOR THE SEASON.........5963  DEPARTURE.....-171
TOTAL HEATING UNITS LAST SEASON TO DATE....5723  DIFFERENCE....+240
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............31 W   AT  10:03 P.M.
                   AEROVANE.............27 W   AT  10:03 P.M.
                   ASOS.................29 SSW AT   6:45 P.M.
                   DAVIS................30 W   AT  10:03 P.M.
FASTEST MILE FOR YESTERDAY..............26 S   AT   6:47 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...........22 SSW AT   6:45 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..........23 S   AT   6:45 P.M.
AVERAGE WIND SPEED AND DIRECTION......11.8 S
                   ASOS...............12.1
                   DAVIS..............11.7 SSW [193 DEG]
* last of several occurrences
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.13  DEPARTURE....+0.01
                         ASOS..............0.13
TOTAL PRECIPITATION FOR THE MONTH..........2.15  DEPARTURE....+1.02
                         ASOS..............2.14 
TOTAL PRECIPITATION FOR THE YEAR..........16.76  DEPARTURE....-2.32
                         ASOS.............17.82 
 
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 MAY 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/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/000/00          37 SSW   AERO 37 MPH SSW
5/2 68/52/60/+8/0.05/263/31       32 WNW
5/3 64/48/56/+3/T/068/08          25 S
5/4 64/48/56/+3/0.01/009/01       17 SSW
5/5 52/44/48/-5/.../000/00        43 NNE   AERO 40 MPH NNE
5/6 63/43/53/-1/.../189/22        24 SSE  
5/7 68/49/59/+5/.../009/01        29 S    
5/8 75/52/64/+10/.../.../..       28 S
5/9 71/55/63/+8/.../.../..        31 W
 
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 10
HIGH 93F IN 1896
LOW 29F IN 1900
PRE 1.85 INS IN 1998
SNOW 2.8 INS 1977 (7.8 INS TOTAL 5/9-5/10 1977)
PEAK GUST 64 MPH S IN 1990
 
RECORDS FOR MAY 11
HIGH 90F IN 1993
LOW 28F IN 1900
PRE 1.28 INS IN 1957
SNOW 1.0 INS IN 1907 (LATEST MEASURABLE SNOW ON RECORD)
PEAK GUST 75e MPH NW IN 1945
 
TODAY'S REPORT PREPARED BY: Andrew Hoell