BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JUNE 30, 2009   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
LOW STRATUS CLOUDS AND FOG RETURN EARLY TODAY
COOL TEMPERATURES WELL BELOW THE NORMS AGAIN
MEASURABLE PRECIPITATION ON 18 DAYS THIS MONTH
 
This final day of June seems to be turning
out just like so many other days this month,
overcast and cool with northeast winds. No
sunshine was observed through noon today. If we
get no sunshine today the month will wind up
with between 26 and 27% of the possible bright sunshine. 
Normal for June is 55% and the gloomiest June in 1903 
had just 25% of the possible sunshine. Second
place has been June, 1998, with 36%. So, this
month is now in line to take over 2nd place, not
an enviable distinction for most of us.    
Temperatures have only made it up to the mid-60's
at best today after a morning low of 57F. No
precipitation has been observed through noon, but
there has been measurable rainfall on 11 out of
12 days ending with yesterday.  A total of 18 days
have had measurable precipitation for June. The
monthly total of just over 5 inches is a little
over one inch above the average.
 
Today's observations:
 
7 A.M.  
Weather: Obscured with heavy fog
Temperature: 59F, Dew point: 59F, Wind: N at 3 kts
Sea-level pressure: 29.64 inches Hg, rising
Visibility: Zero  
6-hour minimum temp: 57F
24-hour rainfall: 0.15 inch
BHO SA 1155 W1 X 0F 038/59/59/0103/964/ 8////
52019 MANUAL 70015 ASOS 70016 10061 20057
 
10 A.M.  
Weather: Partial obscurement with fog, overcast
with stratus, 1/10 sky obscured, sky showing
some brightening   
Temperature: 63F, Dew point: 60F, Wind: NE at 6 kts
Sea-level pressure: 29.67 inches Hg, rising
Visibility: 2 miles
BHO SA 1455 –X E5 OVC 2F 046/63/60/0506/967/
F1 SKY BRGHTNG/ 8/6// 51008
 
1 P.M.  
Weather: Low overcast stratus, brightening sky 
Temperature: 63F, Dew point: 60F, Wind: NE at 8 kts,
Wind: Direction variability N to ENE
Sea-level pressure: 29.69 inches Hg, rising
Visibility: 5 miles, SW 8 N 3 
6-hourly max. temp. 64F
BHO SA 1755 E3 OVC 5F 054/63/60/0508/969/
BRGHT SKY VSBY N 3 SW 8 WND 01V07/ 8/6//
51008 10064 20059
 
WEATHER SUMMARY FOR MONDAY, JUNE 29
 
TEMPERATURE (DEGREES F)
MAX.....74    NORMAL.....79
MIN.....59    NORMAL.....59
MEAN....67    NORMAL.....69
 
DEPARTURE FROM 30-YEAR NORMAL...........-2
TOTAL DEPARTURE FOR THE MONTH.........-109 [-4.0 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............0  DEPARTURE.......-1
TOTAL HEATING UNITS FOR THE MONTH...........114  DEPARTURE......+41
TOTAL HEATING UNITS FOR THE SEASON.........6235  DEPARTURE.....-135
TOTAL HEATING UNITS LAST SEASON TO DATE....5942  DIFFERENCE....+293
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............20 N   AT 11:01 P.M. * 
                   AEROVANE..............16 NNW AT 10:27 P.M. *  
                   ASOS..................17 WNW AT 12:06 A.M.  
                   DAVIS.................20 WNW AT 12:07 A.M. 
FASTEST MILE FOR YESTERDAY...............12 NW  at 12:32 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE............12 NW  AT 11:57 P.M.     
MAXIMUM 2-MINUTE DAVIS AVERAGE...........15 WNW AT 12:35 A.M.    
AVERAGE WIND SPEED AND DIRECTION........7.3 SSE  
                   ASOS.................7.1
                   DAVIS................6.7 SSW [200 DEG]
* last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.15  DEPARTURE....+0.02
                         ASOS..............0.16
TOTAL PRECIPITATION FOR  JUNE..............5.11  DEPARTURE....+1.31
                         ASOS..............5.08 
TOTAL PRECIPITATION FOR THE YEAR..........23.61  DEPARTURE....-1.93
                         ASOS.............24.63 
 
PRELIMINARY CLIMATE SUMMARY FOR JUNE 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
6/1  69/41/55/-7/0/706/78          29 SSW    AERO 25 MPH SSW
6/2  76/53/65/+3/T/525/58          28 S      AERO 24 MPH S
6/3  69/54/62/0/T/254/28           23 SSW    
6/4  73/53/63/0/0/327/36           22 SSE    
6/5  64/51/58/-5/0.05/000/00       21 NE
6/6  73/51/62/-1/0.01/428/47       25 SSE
6/7  79/56/68/+4/0/583/64          28 W      AERO 24 MPH W
6/8  73/57/65/+1/0/529/58          18 ENE
6/9  59/51/55/-9/0.10/000/00       27 E
6/10 59/52/56/-8/0.00/000/00       21 NE    
6/11 57/52/55/-10/0.17/000/00      23 NNE    AERO 21 MPH NE
6/12 70/53/62/-3/0.43/119/13       30 SSE    AERO 29 MPH SSE
6/13 75/59/67/+2/T/796/87          23 NNE
6/14 63/54/59/-6/0.34/101/11       20 E
6/15 60/52/56/-10/0.06/027/03      20 NE
6/16 64/51/58/-8/T/568/62          22 NNE  
6/17 74/50/62/-4/0/807/88          28 S      AERO 24 MPH S
6/18 65/52/59/-7/0.44/000/00       35 ESE
6/19 70/61/66/-1/0.47/000/00       33 SE     AERO 31 MPH SE
6/20 76/60/68/+1/0/266/29          21 NNE
6/21 61/57/59/-8/0.55/000/00       44 N      AERO 42 MPH N
6/22 60/58/59/-8/1.26/000/00       42 NNE    AERO 39 MPH NNE 
6/23 64/57/61/-7/0.33/000/00       38 N      AERO 33 MPH N
6/24 62/55/59/-9/0.12/000/00       27 N     
6/25 74/58/66/-2/0.02/156/17       21 SSW  
6/26 79/62/71/+3/0.03/339/37       30 WSW
6/27 78/59/69/0/0.20/513/56        23 N
6/28 64/58/61/-8/0.03/000/00       21 N
6/29 74/59/67/-2/0.50/220/24       20 N
 
6/30 our morning low temp: 57F; the normal low is now 60F
 
NEW DAILY RECORDS FOR JUNE 2009 TO DATE...
NONE
 
DAILY EXTREMES
 
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JUNE 30
HIGH 94F IN 1964
LOW 47F IN 1919
PRECIP 3.04 INS IN 1921
PEAK GUST 51 MPH WNW IN 1957
 
RECORDS FOR JULY 1
HIGH 98F IN 1964
LOW 44F IN 1988 [RECORD FOR MONTH]
PRECIP 4.46 INS IN 1915 [RECORD FOR MONTH]
PEAK GUST 52 MPH WNW IN 1974
 
TODAY'S REPORT PREPARED BY: Robert Skilling