BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JULY 1, 2009   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
THE JUNE 2009 STATS
Temperature deg. F
Av. Max. 68.4
Av. Min. 54.8
Mean     61.6 [-4.1]
24-hr. corr. mean 60.6
Max. temp: 79 on 7th/26th
Min. temp: 41 on 1st
HDD units: 117 [+43]
HDD Season: 6238 [-133]
CDD units: 22 [-71]
CDD Season: 61 [-57]
Precipitation: 5.14 ins. [+1.21]
No.days measurable: 19
Total no. of days (with traces): 24
Wind: 9.1 MPH (corrected 9.8 MPH)
Prevailing direction: N @ 14%
Directions of N,NNE,NE @ 34%
Fastest mile: 29 MPH NNE on 21st
Peak gust; 44 MPH N on 21st
Sunshine: 27% of possible or 118.1 hrs. (sun card)
Long term June average: 55%
 
THE JUNE 2009 RANKINGS....
 
The list of high rankings for June is very impressive, though the 
only new record is lowest wind speed for June. The corrected mean 
temperature for June (60.6) was the 10th coldest on record. Note that 
due to the cloudiness, the average maximum temperature was third 
coldest on record (with -6.2 departure), but the average minimum 
temperature was only a half degree below the 110-year mean for June.
 
Lowest June Bright Sunshine (1886-2009), percent:
 
1) 25% in 1903
2) 27% in 2009
3) 36% in 1998
4) 37% in 1959
5) 39% in 1948
   39% in 2006
 
Lowest June Bright Sunshine (1886-2009), hours:
 
1) 108.7 in 1903
2) 118.1 in 2009
3) 157.9 in 1998
4) 161.2 in 1959
5) 171.8 in 1948
 
Lowest Monthly Bright Sunshine (1886-2009), percent:
 
1) 21% in Apr 1901
2) 24% in Oct 1913
3) 25% in Jun 1903
4) 27% in Dec 1972
   27% in Jun 2009
 
Coldest June Average Maximum Temp (1885-2009), deg F:
 
1) 66.1 in 1903
2) 66.7 in 1916
3) 68.4 in 2009
4) 69.3 in 1982
5) 69.4 in 1897
 
Lowest June Monthly Maximum Temp (1885-2009), deg F:
 
1) 78 in 1916
2) 79 in 2009
3) 81 in 1886
4) 82 in 1936
   82 in 1972
   82 in 1982
   82 in 1985
 
Most June Days Measurable Precipitation (1886-2009), days:
 
1) 20 in 1916
2) 19 in 2009
3) 18 in 1922
   18 in 1945
 
Lowest June Wind Speed (1885-2009), mph:
 
1) 9.8 in 2009
2) 10.3 in 1895
3) 10.6 in 2005
   10.6 in 2008
5) 10.8 in 2003
 
Lowest Monthly Wind Speed (1885-2009), mph:
 
1) 9.5 in Aug 1996
   9.5 in Aug 2008
3) 9.8 in Jun 2009
4) 10.0 in Aug 1899
 
The June prevailing wind direction of N has never before happened 
in the years that are tabulated (1951-2009).  A prevailing direction 
of NE was observed in June 1954 and 1982.  The last month to have a 
prevailing wind direction of N was January 1998.  Only five months 
in this period of record (1951-2009) had a N prevailing direction, 
and these occurred in January, March, October, November and December. 

 
Today's observations:
 
7 A.M.  
Weather: Obscured with heavy fog
Temperature: 58F, Dew point: 58F, Wind: NE at 10 kts
Sea-level pressure: 29.81 inches Hg, rising
Visibility: 1/16 mile, zero past hour   
6-hour minimum temp: 57F
24-hour rainfall: 0.03 inch
BHO SA 1155 W2 X 1/16F 096/58/58/0410/981/
VSBY 0 PST HR/ 8//// 53013 MANUAL 70003
ASOS 70002 10059 20057
 
10 A.M.  
Weather: Obscurement with fog, rain shower past hour 
Temperature: 58F, Dew point: 58F, Wind: NNE at 12 kts
Sea-level pressure: 29.82 inches Hg, rising
Visibility: zero variable to 1/16
3-hourly rainfall: 0.01
BHO SA 1455 W1 X 0VF 099/58/58/0312/982/ VSBY 0V1/16 WND 36V06
RB50E54/ 8//// MANUAL 6001/ ASOS 60001
 
1 P.M.  
Weather: Obscurement with heavy fog, thunderstorm and
light rain occurring, occasional lightning in cloud
all quadrants  
Temperature: 58F, Dew point: 58F, Wind: N at 11 kts,
Sea-level pressure: 29.85 inches Hg, rising
Visibility: zero 
6-hourly max. temp. 60F
6-hourly rainfall: 0.05 inch
BHO SA 1755 W1 X0TR-F 107/58/58/0111/985/
TB1659 OVHD ALQDS MOVG N OCNL LTGICCC OVHD-ALQDS/
8////53008 ASOS 60004 MANUAL 6005/ 10060 20058
 
WEATHER SUMMARY FOR TUESDAY, JUNE 30
 
TEMPERATURE (DEGREES F)
MAX.....66    NORMAL.....79
MIN.....57    NORMAL.....59
MEAN....62    NORMAL.....69
 
DEPARTURE FROM 30-YEAR NORMAL...........-7
TOTAL DEPARTURE FOR THE MONTH.........-116 [-4.1 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............3  DEPARTURE.......+2
TOTAL HEATING UNITS FOR THE MONTH...........117  DEPARTURE......+43
TOTAL HEATING UNITS FOR THE SEASON.........6238  DEPARTURE.....-133
TOTAL HEATING UNITS LAST SEASON TO DATE....5942  DIFFERENCE....+296
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............23 NE  AT  3:06 P.M.  
                   AEROVANE..............20 NE  AT  3:06 P.M.   
                   ASOS..................22 NE  AT  3:06 P.M.   
                   DAVIS.................21 NE  AT  3:05 P.M. 
FASTEST MILE FOR YESTERDAY...............15 NE  AT  4:51 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE............16 NE  AT  3:07 P.M.      
MAXIMUM 2-MINUTE DAVIS AVERAGE...........16 NE  AT  3:07 P.M.    
AVERAGE WIND SPEED AND DIRECTION........8.3 N    
                   ASOS.................7.9
                   DAVIS................8.4 NE [040 DEG]
* last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.03  DEPARTURE....+0.02
                         ASOS..............0.02
TOTAL PRECIPITATION FOR  JUNE..............5.14  DEPARTURE....+1.21
                         ASOS..............5.10 
TOTAL PRECIPITATION FOR THE YEAR..........23.64  DEPARTURE....-2.03
                         ASOS.............24.65 
 
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  77/53/65/+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      TSTM
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 66/57/62/-7/0.03/119/13       23 NE
 
7/1  morning low temp: 57F; our 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 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
 
RECORDS FOR JULY 2
HIGH 95F IN 1963
LOW 47F IN 1988
PRECIP 1.42 INS IN 1986
PEAK GUST 45 MPH SW IN 1999
 
TODAY'S REPORT PREPARED BY: Robert Skilling / Mike Iacono