BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JUNE 1, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME
 
MAY BECOMES WARMEST ON RECORD AT 61.5F (24 HR CORR MEAN)
JUNE BEGINS WITH RECORD LOW MAXIMUM TEMPERATURE
MAY ENDS WITH SIGNIFICANT RAINFALL OF ABOUT 0.8 INCH
INTERMITTENT LIGHT RAIN AND DRIZZLE TODAY
NE WINDS CONTINUE GUSTING TO 25 TO 30 MPH
 
May just edges out 1991 as warmest May on record.
See listing below...
 
The record low maximum temperature of 51F set on June 1, 2004,
will probably be surpassed today as our maximum through early
this afternoon is only 48F. The last times that the temperature
remained in the 40s in June were highs of 48F on June 7, 1982
and 47F on June 9, 1956. 
 
Rainfall which began yesterday can down heavily at mid-afternoon
accumulating close to 0.3 inch in one hour (3-4PM EDT) included
a brief thunderstorm. The total by midnight (ASOS, manual not yet
available) was 0.84 inch.  An additional 0.14 inch accumulated by
7 A.M. ob time this morning. 
 
BHO Warmest Mays, deg F (1885-2015)
 
1) 61.5 in 2015
2) 61.4 in 1991
3) 61.0 in 1944
4) 60.9 in 2010
5) 59.4 in 1911
   59.4 in 1959
 
Today's Observations:

7 A.M.
Weather: Obscurement with fog and light drizzle occurring
Temperature: 47F; Dew Point: 47F; Wind: NE at 12G19 kts,
Sea-level pressure: 30.24 ins. Hg, rising
Visibility: 1/16 mile, fog and light drizzle
6-hr Max temp: 47F
6-hr Min temp: 46F
24-hr precip: 0.93 inches
BHO SA 1155 W3 X 1/16VL-F 242/47/47/0512G19/024/
VSBY 1/6V1/8 WND 02V09/ 8//// 53007 ASOS 60010
MANUAL 6/XXX ASOS 70095 MANUAL 70093 10047 20046
 
10 A.M.
Weather: Obscured light drizzle and fog
Temperature: 46F; Dew Point: 46F; Wind: NE a 13G19 kts
Sea-level pressure: 30.24 ins. Hg, steady
Visibility: 1/8 mile, light drizzle and fog  
3-hr precip: 0.05 inches
BHO SA 1455 W3 X 1/8L-F 242/47/47/0513G19/024/ STRA DRFTG
OVR SMT VSBY BRFLY 1 SW GST TO 23 KTS PST HR/ 8//// 53000 MANUAL
6/005 ASOS 60005
 
1 P.M.
Weather: Overcast stratus, very light drizzle 
Temperature: 46F; Dew Point: 46F;  Wind: NE at 15G27 kts;
Wind: Peak wind NE at 27 KTS at 48 past the hour
Sea-level pressure 30.24 ins. Hg, falling very slightly
Visibility: 3/4 miles, except 1/8 NE, 1 mile ESE-W, very light
6-hr Max temp: 48F
6-hr Min temp: 46F
6-hr precip: 0.14 inches
BHO SA 1755 E5 OVC 3/4L-F 241/46/46/0415G27/024/ VSBY NE 1/8
VSBY 1 ESE-W PCPN VRY PK WND 0427/48/ 8/6// 58001 MANUAL 6014/
ASOS 60015 10048 20046
 
SUMMARY FOR SUNDAY, MAY 31, 2015
  
TEMPERATURE (DEGREES F)
MAX.....78   NORMAL.....71
MIN.....46   NORMAL.....52
MEAN....62   NORMAL.....61

DEPARTURE FROM 30-YEAR NORMAL........................+1
TOTAL DEPARTURE FOR THE MONTH......................+160 [+5.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............3  DEPARTURE...........-2
TOTAL HEATING UNITS FOR THE MONTH.............133  DEPARTURE.........-135
TOTAL HEATING UNITS FOR THE SEASON...........6404  DEPARTURE.........+101
TOTAL HEATING UNITS LAST SEASON TO DATE......6394  DIFFERENCE.........+10

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............0   DEPARTURE..........-1
TOTAL COOLING UNITS FOR THE MONTH.............49   DEPARTURE.........+27
TOTAL COOLING UNITS FOR THE SEASON............49   DEPARTURE.........+25
TOTAL COOLING UNITS LAST SEASON TO DATE.......13   DIFFERENCE........+36

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..................40  NE   AT  4:20 P.M.            
                   ASOS.......................44  NE   AT  4:19 P.M.             
                   DAVIS......................41  ENE  AT  4:09 P.M. RMY 43
FASTEST MILE FOR YESTERDAY....................28  NE   AT  3:01 P.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE.................30  NE   AT  3:01 P.M.            
MAXIMUM 2-MINUTE DAVIS AVERAGE................28  NE   AT  2:50 P.M.      
AVERAGE WIND SPEED AND DIRECTION..............16.3   
                   ASOS.......................16.6   
                   DAVIS......................15.0 S [190 deg.] 
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.93  DEPARTURE.....N/A
                         ASOS...............0.95
TOTAL PRECIPITATION FOR THE MONTH...........N/A   DEPARTURE.....N/A
                         ASOS...............N/A
TOTAL PRECIPITATION FOR THE YEAR........... N/A   DEPARTURE.... N/A
                         ASOS...............N/A ***
*** ASOS annual totals not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY GUST
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized

5/1  52/37/45/-8/0.00/0.0/354/42               21 NE  RMY 20
5/2  63/35/49/-4/0.00/0.0/668/79               20 S   RMY 20
5/3  74/44/59/+6/0.00/0.0/509/60               22 S   RMY 22
5/4  83/47/65/+11/0.00/0.0/783/92              39 SSW RMY 45
5/5  77/56/67/+13/0.03/0.0/222/26              29 SW  RMY N/A
5/6  74/54/64/+10/0.00/0.0/574/67              24 SSW RMY 25
5/7  84/52/68/+13/0.00/0.0/824/96              29 S   RMY 32
5/8  74/44/59/+4/0.00/0.0/809/94               27 NNE RMY 26
5/9  77/44/61/+6/0.00/0.0/509/59               30 S   RMY 32
5/10 88/60/74/+19/0.00/0.0/692/80              28 SSW RMY 30
5/11 84/48/66/+10/0.00/0.0/529/61              30 NE  RMY 31
5/12 84/47/66/+10/0.24/0.0/287/33              33 WNW RMY 37
5/13 67/47/57/+1/0.00/0.0/820/94               31 WNW RMY N/A
5/14 70/44/57/+0/0.00/0.0/848/97               22 NW  RMY 22
5/15 73/51/62/+5/0.00/0.0/491/56               20 WSW RMY 21
5/16 68/53/61/+4/T/0.0/053/06                  23 S   RMY 24
5/17 79/50/65/+8/T/0.0/783/89                  21 NE  RMY N/A
5/18 62/48/55/-3/..../0.0/538/61               25 NE  RMY N/A
5/19 63/50/57/-1/0.36/0.0/000/00               24 S   RMY 26
5/20 66/46/56/-2/0.00/0.0/.../..               32 WNW RMY 37
5/21 66/43/55/-4/..../0.0/.../..               24 S   RMY 24
5/22 73/49/61/+2/T/0.0/.../..                  32 NW  RMY 36
5/23 64/40/52/-7/0.00/0.0/.../..               28 WNW RMY 32
5/24 81/50/66/+7/0.00/0.0/.../..               28 SSW RMY 31
5/25 80/56/68/+8/0.00/0.0/.../..               29 SSW RMY 31
5/26 83/61/72/+12/0.00/0.0/.../..              30 SSW RMY N/A
5/27 82/62/72/+12/T/0.0/.../..                 36 SSW RMY 41
5/28 83/61/72/+11/0.00/0.0/.../..              30 SSW RMY 34
5/29 77/55/68/+7/0.00/0.0/.../..               18 ENE RMY 19
5/30 85/55/70/+9/0.00/0.0/.../..               37 SSW RMY 42
5/31 78/46/62/+1/..../../.../..                40 NE  RMY 43 
 
6/1 low since midnight is 46F; normal low is now 53F

DAILY RECORDS FOR MAY 2015

NONE
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JUNE 1
HIGH 90F IN 1937,2013
LOW 36F IN 1945 [Record for month]
PRECIP 2.28 INS IN 1992
PEAK GUST 51e MPH SE IN 1952
 
RECORDS FOR JUNE 2
HIGH 91F IN 1895
LOW 41F IN 1907, 1929
PRECIP 2.36 INS IN 1982
SNOWFALL TRACE IN 1907 (IP)
PEAK GUST 63 MPH NW IN 2000
 
TODAY'S REPORT PREPARED BY: Robert Skilling