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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JULY 31, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

ABOVE SEASONABLE, WARM WEATHER ACCOMPANIED BY LIGHT WINDS ATOP GREAT 
BLUE HILL.... 

The wind has stayed light and variable since morning. Visibility 
was limited by either fog or haze most of the day, reaching 
40 miles by noontime. The maximum temperature so far today is 86F, 
5 degrees over the normal of 81F. The low since midnight is 63F, 
same as the daily normal. This July has been warmer than seasonable,
and could finish in the top ten warmest July's on record at Blue Hill. 

Today's Observations:

7 A.M.
Weather: Broken cirrostratus, few stratus fractus S-NNW
Temperature: 68F; Dew Point: 65F; Wind: W at 3 kts
Sea-level pressure: 30.14 ins. Hg, steady
Visibility: 20 miles, distant fog in all directions  
6-hr Max temp: 68F
6-hr Min temp: 63F
24-hr Precip: 0.00 ins. 
BHO SA 1155 E250 BKN 20 206/68/65/2703/014/ FEW STFA S-NNW DSNT FG ALQDS 
WND L/V/ 8/708 50000 10068 20063

10 A.M.
Weather: Scattered cirrostratus, few cumulus in all directions
Temperature: 79F; Dew Point: 65F; Wind: WSW at 3 kts,
Wind: Light and variable
Sea-level pressure: 30.14 ins. Hg, rising slightly
Visibility: 40 miles, distant haze
3-hr Precip: 0.00 ins.  
BHO SA 1455 250 SCT 40 208/79/65/2403/014/ FEW CU ALQDS DSNT HZ ALQDS WND 
L/V/ 8/208 51002 

1 P.M.
Weather: Scattered altocumulus, broken cirrostratus,
few cumulus in all directions
Temperature: 84F; Dew Point: 62F; Wind: S at 5 kts,
Wind: Light
Sea-level pressure: 30.13 ins. Hg, falling steadily 
Visibility: 40 miles, distant haze
6-hr Max temp: 86F
6-hr Min temp: 67F
6-hr precip: 0.00 ins.
BHO SA 1755 180 SCT E250 40 203/84/62/2205/013/ FEW CU ALQDS 
DSNT HZ ALQDS WND LGT/ 8/188 58005 10086 20067

SUMMARY FOR MONDAY, JULY 30, 2018 

TEMPERATURE (DEGREES F)
MAX.....82   NORMAL.....81
MIN.....64   NORMAL.....63
MEAN....73   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL.........................+1
TOTAL DEPARTURE FOR THE MONTH........................+85 [+2.6 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............8   DEPARTURE..........+1
TOTAL COOLING UNITS FOR THE MONTH.............286   DEPARTURE.........+71
TOTAL COOLING UNITS FOR THE SEASON............445   DEPARTURE........+101
TOTAL COOLING UNITS LAST SEASON TO DATE.......413   DEPARTURE.........+32

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................18 W  AT  4:13 A.M.
                   AERO.........................16 W  AT  4:13 A.M.
                   ASOS.........................19 W  AT  4:12 A.M.
                   DAVIS........................19 W  AT  4:12 A.M. RMY 17
FASTEST MILE FOR YESTERDAY......................13 W  AT  4:11 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................14 SW AT  5:21 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................15 W  AT  4:13 A.M.
AVERAGE WIND SPEED AND DIRECTION...............7.9 SW
                   ASOS........................8.5
                   DAVIS.......................8.1 SW [220 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.16
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........3.84  DEPARTURE......-0.04
                         ASOS..............3.85 
TOTAL PRECIPITATION FOR THE YEAR..........34.01  DEPARTURE......+3.34
                         ASOS.............35.58

PRELIMINARY CLIMATE SUMMARY FOR JULY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system 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
M:    Missing data

7/01 94/72/83/+13/0.00/667/73       21 ESE AERO 18 ESE RMY 19 
7/02 90/68/79/+9/0.00/858/94        21 S   AERO 21 S   RMY 22
7/03 94/69/82/+11/0.00/657/72       20 SSW AERO 18 SW  RMY 19 TSTM
7/04 89/73/81/+10/0.00/884/97       17 NE  AERO 15 NE  RMY 16
7/05 91/73/82/+11/0.00/865/95       29 SSW AERO 28 SSW RMY N/A
7/06 80/59/70/-1/0.56/018/02        37 NNW AERO 38 SW  RMY 40 TSTM
7/07 78/54/66/-5/0.00/900/99        22 N   AERO 18 N   RMY N/A 
7/08 83/57/70/-2/0.00/890/98        23 S   AERO 21 S   RMY 22  
7/09 88/60/74/+2/0.00/852/94        23 SW  AERO 23 SW  RMY 24 
7/10 91/63/77/+5/0.10/751/83        24 W   AERO 22 W   RMY N/A
7/11 73/62/68/-4/0.63/705/78        28 NE  AERO 25 NE  RMY 27 TSTM
7/12 77/56/67/-5/0.00/867/96        16 NW  AERO 15 NW  RMY N/A 
7/13 84/61/73/+1/0.00/568/63        23 SSE AERO 23 SSE RMY 24
7/14 80/61/71/-1/0.00/540/60        18 S   AERO 16 S   RMY 19
7/15 84/65/75/+3/T/521/58           16 S   AERO 15 S   RMY 14 
7/16 83/67/75/+3/0.00/682/76        23 S   AERO 23 S   RMY 23 
7/17 88/67/78/+6/1.34/430/48        31 SW  AERO 30 SW  RMY 32 TSTM 
7/18 81/63/72/0/0.02/769/86         21 NW  AERO 22 NW  RMY 23 
7/19 80/56/68/-4/0.00/.../..        21 S   AERO 17 SSE RMY 19 
7/20 83/62/73/1/0.00/.../..         21 SE  AERO 17 ESE RMY 19
7/21 76/59/68/-4/..../.../..        23 ENE AERO 20 ENE RMY N/A
7/22 76/63/69/-3/..../.../..        29 ESE AERO 28 ESE RMY N/A
7/23 82/71/77/+5/..../.../..        32 S   AERO 30 S   RMY 32 
7/24 85/72/79/+7/T/.../..           31 S   AERO 29 S   RMY 29 
7/25 82/71/77/+5/..../.../..        35 SSE AERO 32 SSE RMY N/A 
7/26 83/69/76/+5/..../.../..        41 SSW AERO 39 SSW RMY N/A TSTM
7/27 88/69/79/+7/..../.../..        25 S   AERO 23 SSW RMY 26
7/28 87/71/79/+7/..../.../..        28 S   AERO 26 S   RMY 29
7/29 82/67/75/+3/0.00/.../..        18 W   AERO 16 W   RMY 18
7/30 82/64/73/+1/0.00/.../..        18 W   AERO 16 W   RMY 17


7/31 Low temp since midnight is 63F; normal low is now 63F

DAILY RECORDS FOR JULY 2018

07/01/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 72F, 
          TIES PREVIOUS RECORD OF 72F SET IN 1968

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR JULY 31
HIGH 95F IN 1917
LOW 50F IN 1895,1918
PRECIP 1.34 INCHES IN 1892
PEAK GUST 43e MPH WNW IN 1953, 43 SW IN 1971

RECORDS FOR AUGUST 1
HIGH 97F IN 1917
LOW 49F IN 1891
PRECIP 3.61 INCHES IN 1927
PEAK GUST 41 MPH NNW IN 1985

TODAY'S REPORT PREPARED BY: Benjamin Turner