BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, APRIL 6, 2010 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
NEW RECORD HIGH MINIMUM TEMPERATURE OF 53F FOR
APRIL 5, SURPASSES THE PREVIOUS RECORD OF 52F IN 1981
 
APRIL TEMPERATURES CONTINUE TO RUN FAR ABOVE NORMAL
DOUBLE-DIGIT DAILY DEPARTURE FOR FIRST 5 DAYS OF THE MONTH
 
The low of 54 so far today would set a new high minimum 
temperature for April 6, surpassing the previous record 
of 52 in 1912. The day's mean of 63 yesterday averaged 20
degrees warmer than normal.  This leaves the remarkably 
warm first 5 days of April running some 16 degrees above 
the 30-year average. 
 
Temperatures more typical of late May or June will continue 
through Thursday.
 
Today's observations:
 
7 A.M.
Weather: Few thin cirrus, patches of dense cirrus,
few altocumulus
Temperature: 60F, Dew point: 43F, Wind: W at 7 kts
Sea-level pressure: 29.94 inches Hg, rising
Visibility: 50 miles
6-hour minimum temp: 54F
BHO SA 1155 250 –SCT 50 140/60/43/2807/994/ FEW AC
SSW-WNW PTCHS DENS CI NNW-NE AND ESE-S 8/042 51007
10060 20054  
 
10 A.M.
Weather: Light rain shower, rain began 9:20 EST,
overcast altocumulus, ceiling higher north,
thin smoke later north thru east  
Temperature: 62F, Dew point: 49F, Wind: Calm
Sea-level pressure: 29.95 inches Hg, rising
Visibility: 35 miles, light rain shower
3-hour rainfall: Trace
BHO SA 1455 E90 OVC 35RW- 141/62/49/0000/995/ CIG HIER N
THN K LYR N-E RB20/ 8/07/ 53001 MANUAL 6000/
 
1 P.M.
Weather: Overcast altostratus and altocumulus, ceiling
lower and dark west thru northwest, occasional breaks
in overcast southeast thru south, altocumulus castellanus
southeast thru south, thin smoke layer north-northwest
thru northeast 
Temperature: 65F, Dew point: 46F, Wind: E at 4 kts,
Sea-level pressure: 29.88 inches Hg, falling
Visibility: 30 miles, west-northwest 70 miles
6-hour maximum temp: 66F
6-hour rainfall: Trace
BHO SA 1755 70 SCT E90 OVC 30 119/65/46/0904/988/
CIG LWR/DRK W-NW OCNL BINOVC SE-S ACC SE-S THN K LYR NNW-NE
RWUW-N VSBY WNW-NW 20/ 8/08/ 58022 MANUAL 6000/ 10066 20060     
 
WEATHER SUMMARY FOR MONDAY, APRIL 5
 
TEMPERATURE (DEGREES F)
MAX.....72     NORMAL.....52
MIN.....53     NORMAL.....34
MEAN....63     NORMAL.....43
 
DEPARTURE FROM 30-YEAR AVERAGE.............+20
TOTAL DEPARTURE FOR THE MONTH..............+82 (+16.2 DEGREES/DAY)
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............2    DEPARTURE.......-20
TOTAL HEATING UNITS FOR THE MONTH............33    DEPARTURE.......-82
TOTAL HEATING UNITS FOR THE SEASON.........5129    DEPARTURE......-450
TOTAL HEATING UNITS LAST SEASON TO DATE....5514    DIFFERENCE.....-385
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............37 SSE AT   2:51 P.M.
                   AEROVANE..............40 SSE AT   3:04 P.M. * 
                   ASOS..................37 S   AT   2:51 P.M.    
                   DAVIS.................37 S   AT   3:04 P.M.   
THE FASTEST MILE FOR YESTERDAY...........29 SSE AT   3:05 P.M. *  
MAXIMUM 2-MINUTE ASOS AVERAGE............29 S   AT   2:52 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE...........29 S   AT   2:52 P.M.     
AVERAGE WIND SPEED AND DIRECTION.........14.0 S 
                   ASOS..................13.7
                   DAVIS.................13.4 SSW [196 DEG]
* last of several occurrences
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH.........trace  DEPARTURE......-0.75
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE YEAR..........27.91  DEPARTURE.....+13.53
                         ASOS.............28.10
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE......-0.1
TOTAL SNOWFALL FOR THE MONTH................0.0  DEPARTURE......-0.6
TOTAL SNOWFALL FOR THE SEASON..............64.4  DEPARTURE......+6.9
 
PRELIMINARY CLIMATE SUMMARY FOR APRIL 2010 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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
 
4/1  59/43/51/+10/T/0/359/47        24 NNW   AERO 30 MPH NNW
4/2  67/46/57/+15/0.00/0/.../..     21 SSE
4/3  75/45/60/+18/0.00/0/.../..     26 SSE
4/4  76/45/61/+19/0.00/0/.../..     27 W     AERO 29 MPH W 
4/5  72/53/63/+20/0.00/0/.../..     37 SSE   AERO 40 MPH SSE
 
4/6  our morning low temp: 54F; the normal low is now 34F
 
NEW DAILY RECORDS FOR APRIL 2010
4/4 - new record high maximum temperature of 76F;
surpasses 71F in 1950.
4/5 - new record high minimum temperature of 53F;
surpasses 52F in 1981
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR APRIL 6
HIGH 82 IN 1921
LOW 16 IN 1982
PRE 1.72 INS IN 1886
SNOW 12.3 INS IN 1982
WIND 71e MPH WNW IN 1940
 
RECORDS FOR APRIL 7
HIGH 86 IN 1929
LOW 13 IN 1982
PRECIP 1.72 IN. IN 1924
SNOWFALL 4.5 IN. IN 1967, 1996
PEAK GUST 65 MPH WNW IN 1982
 
TODAY'S REPORT PREPARED BY: Sean Fankhauser/Robert Skilling