BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JUNE 2, 2009   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
MIDDLE AND DENSE HIGH CLOUDS TODAY
WITH WARMER TEMPS. THAN YESTERDAY
 
Cloudy skies yielded just a few drops of
rain early this afternoon around 1 p.m. EDT
Temperatures started out at a near normal
low of 53F this morning and the reading was
12 degrees warmer than 24 hours ago and then
were rising into the 70's this afternoon.   
 
THE MAY 2009 STATS
Temps. Deg. F
Av. Max. 67.5
Av. Min. 48.8
Mean     58.2 [+1.2]
24-hour corr. mean: 57.8
Max. temp: 89, 21st
Min. temp: 41, 11th
Total heating units: 225 [-46]
Total this season:  6121 [-176] 
Total cooling units:  21 [ 0  ]
Total this season:    39 [+14 ]
Av. vapor pressure: 11.4 mbs.
Precipitation [inches]
Total for the month: 3.89 [+0.10]
Greatest in 24 hours: 1.35 [5-6th]
[trace of hail, 24th]
Number of days measurable precip: 15
Total number of days with precip: 19
Total for 2009 to date: 18.50 [-3.24]
Wind [miles per hour]
Av. speed: 11.6
Av. speed (corr.) 12.1
Prevailing: S @ 15%
Peak gust: 53 S on 14th,
and W on 10th
Fastest mile: 38 W on 10th
Sunshine data: astronomical, 12708/27136 mins. or 47%
Uncorrected (card minutes) 12264 (204.4 hours)/26226,
also 47%
 
Today's observations:
 
7 A.M.  
Weather: Broken altocumulus and altocumulus castellanus,
overcast cirrus, cirrostratus, dark altocumulus bases
to the southwest, break in overcast north, overcast
partly thin overhead thru northwest to northeast   
Temperature: 63F, Dew point: 53F, Wind: SW at 13 kts,
Wind: Direction variable south to west-southwest,
Wind: Gust to 22 kts past hour 
Sea-level pressure: 29.94 inches Hg, rising
Visibility: 25 miles, hazy 
6-hour minimum temp: 53F  
24-hour rainfall: 0.00 inch
BHO SA 1155 E85 BKN 250 OVC 25 140/63/53/2313/994/
ACC VCNTY STN-SW DRK BASES SW BINOVC N
OVC PTLY THN OVHD-NW-NE HAZY WND 18V25
GST TO 22 KTS PST HR/ 8/087 53003 10063 20053 
 
10 A.M.  
Weather: Scattered altocumulus, altocumulus castellanus,
and altocumulus of a chaotic sky with overcast of dense
cirrostratus, sun visible, break in overcast in the
distant northwest thru north  
Temperature: 68F, Dew point: 54F, Wind: SW at 8 kts,
Sea-level pressure: 29.96 inches Hg, rising slightly
Visibility: 25 miles, hazy  
BHO SA 1455 100 SCT 130 SCT E200 OVC 25 144/68/54/2308/996/
FEW ACC OVHD AC CHAOTIC ALQDS SUN VSB BINOVC DSNT NW-N HAZY/
8/097 51004
 
1 P.M.  
Weather: Scattered altocumulus and altocumulus of a
chaotic sky, scattered dense cirrus, thin overcast
of cirrus with cumulus forming distant WNW-NNE, and
sky clearing of middle and high clouds WNW-NE,
dark sky in the east through south, rain ended 12:05 p.m.     
Temperature: 71F, Dew point: 53F, Wind: SW at 8 kts,
Wind: Direction variability S to W
Sea-level pressure: 29.96 inches Hg, steady
Visibility: 25 miles hazy, E-S 15 miles  
6-hour maximum temp: 72F
6-hour precipitation: Trace
BHO SA 1755 80 SCT 95 SCT 200 SCT 250 –OVC 25 144/71/53/2308/996/
CU FRMG DSNT WNW-NE AC/AC CHAOTIC E-S DENS CI ALQDS
LGE BINOVC/CLRG SKY XTDNG WNW-NE DRK E-S VSBY E-S 15
WND 18V26 HAZY ALQDS RE05/ 8/192 58000 MANUAL 6000/
10072 20063
 
WEATHER SUMMARY FOR MONDAY, JUNE 1
 
TEMPERATURE (DEGREES F)
MAX.....69    NORMAL.....72
MIN.....41    NORMAL.....52
MEAN....55    NORMAL.....62
 
DEPARTURE FROM 30-YEAR NORMAL...........-7
TOTAL DEPARTURE FOR THE MONTH...........-7
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............10  DEPARTURE.......+5
TOTAL HEATING UNITS FOR THE MONTH............10  DEPARTURE.......+5
TOTAL HEATING UNITS FOR THE SEASON.........6131  DEPARTURE.....-171
TOTAL HEATING UNITS LAST SEASON TO DATE....5901  DIFFERENCE....+230
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............29 SSW AT  7:03 P.M. 
                   AEROVANE..............25 SSW AT  7:03 P.M. *
                   ASOS..................28 SSW AT  7:03 P.M.     
                   DAVIS.................29 SSW AT  7:03 P.M.   
FASTEST MILE FOR YESTERDAY...............20 S   AT 11:57 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE............20 S   AT 11:58 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE...........21 SSW AT 9-10  P.M. **    
AVERAGE WIND SPEED AND DIRECTION........12.4 W
                   ASOS.................11.7
                   DAVIS................12.3 WSW [240 DEG]
*  last of several occurrences...
** Davis fastest 2 min. wind minute past the hour N/A,
   also was last of several occurrences..
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE....-0.13
                         ASOS..............0.00
TOTAL PRECIPITATION FOR  JUNE..............0.00  DEPARTURE....-0.13
                         ASOS..............0.00 
TOTAL PRECIPITATION FOR THE YEAR..........18.50  DEPARTURE....-3.37
                         ASOS.............19.55 
 
PRELIMINARY CLIMATE SUMMARY FOR MAY-JUNE 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/-5/0.95/000/00       43 NNE   AERO 40 MPH NNE
5/6  63/43/53/-1/0.40/189/22       24 SSE  
5/7  68/49/59/+5/0.60/009/01       29 S    
5/8  75/52/64/+10/0/690/80         28 S
5/9  71/55/63/+8/0.14/104/12       31 W     TSTM
5/10 65/46/56/+1/0/840/97          53 W     AERO 50 MPH W
5/11 63/41/52/-3/0/781/90          24 WNW
5/12 63/45/54/-2/0/696/80          22 ENE
5/13 70/45/58/+2/0/732/84          31 SSE   AERO 29 MPH SSE
5/14 62/47/55/-2/0.10/166/19       53 S     AERO 52 MPH S
5/15 76/54/65/+8/0/474/54          38 S     AERO 38 MPH S
5/16 68/54/61/+4/T/457/52          35 S     AERO 35 MPH S
5/17 61/49/55/-2/0.09/009/01       35 WNW   AERO 33 MPH WNW
5/18 53/42/48/-10/0.04/168/19      27 NE   
5/19 70/42/56/-2/0/813/92          28 S 
5/20 82/49/66/+8/0/771/87          31 SSW
5/21 89/59/74/+15/0/870/98         37 S     AERO 34 MPH S
5/22 87/59/73/+14/0/739/83         31 N
5/23 65/50/58/-1/T/428/48          28 NE
5/24 80/50/65/+5/1.07/536/60       25 WNW   TSTM TRACE DIME SIZE HAIL
5/25 76/51/64/+4/0/868/97          32 N 
5/26 58/46/52/-8/0/601/67          28 NNE
5/27 52/43/48/-13/0.16/000/00      23 E    
5/28 48/45/47/-14/0.03/000/00      28 NE    AERO 25 MPH NNE
5/29 63/48/56/-5/0.06/000/00       17 NE
5/30 76/59/68/+7/0.16/713/79       32 WSW  
5/31 77/46/62/0/0.03/714/79        42 W     AERO 42 MPH W TSTM
 
6/1  69/41/55/-7/0/706/78          29 SSW
 
6/2  our morning low temp: 53F; the normal low is now 52F
 
NEW DAILY RECORDS FOR MAY 2009...
5/14: RECORD PEAK WIND GUST 53 MPH S;
      surpasses previous record of 50 MPH SW in 1976
 
DAILY EXTREMES
 
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JUNE 2
HIGH 91F IN 1895
LOW 41F IN 1907, 1929
PRECIP 2.36 INS IN 1982
PEAK GUST 63 MPH NW IN 2000
 
RECORDS FOR JUNE 3
HIGH 98F IN 1919
LOW 38F IN 1929
PRECIP 2.40 INS 2006
PEAK GUST 47 MPH NW IN 1998
 
TODAY'S REPORT PREPARED BY: Robert Skilling