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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JULY 30, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

HIGH CLOUDS INCREASE BUT DRY AND PLEASANT WEATHER CONTINUES

Today has been similar to yesterday, with dry weather and temperatures
slightly above normal. The morning low of 64F and the high so far of 82F
are both one degree warmer than normal. Humidity has been tolerable again
today, with the dew point falling below 60F. A blanket of cirrostratus
clouds invaded the sky from late morning into the afternoon, dimming but
not blocking the Sun. Winds have been very light again today, only around
5 mph with the direction variable. Visibility has been fairly good today,
running at 60-70 miles.

Today's Observations:

7 A.M.
Weather: Thin broken cirrus, few patches of dense cirrus
Temperature: 68F; Dew Point: 59F; Wind: WNW at 7 kts
Sea-level pressure: 30.16 ins. Hg, rising
Visibility: 70 miles
6-hr Max temp: 68F
6-hr Min temp: 64F
24-hr Precip: 0.00 ins. 
BHO SA 1155 E250 –BKN 70 214/68/59/3007/016/ FEW PTCHS DNS CI/ 
8/001 52007 10068 20064

10 A.M.
Weather: Broken cirrus (partly thin), few cumulus north and distant E-SSE,
few cumulus and moderate cumulus distant W-NW, few dense cirrus
Temperature: 77F; Dew Point: 60F; Wind: estimated S at 3 kts,
Wind: Light and variable
Sea-level pressure: 30.17 ins. Hg, rising slightly
Visibility: 60 miles, light distant haze
3-hr Precip: 0.00 ins.  
BHO SA 1455 E250 BKN 60 216/77/60/E1803/017/ FEW CU N AND DSNT E-SSE 
FEW CU AND MDT CU DSNT W-NW FEW DNS CI CI LYR PRTLY THN 
LGT DSNT HZ WND L/V// 8/402 53002

1 P.M.
Weather: Overcast cirrostratus, few cumulus all quadrants
Temperature: 81F; Dew Point: 57F; Wind: estimated S at 6 kts,
Wind: Light and variable
Sea-level pressure: 30.15 ins. Hg, rising then falling 
Visibility: 60 miles, light distant haze
6-hr Max temp: 82F
6-hr Min temp: 68F
6-hr precip: 0.00 ins.
BHO SA 1755 E200 OVC 60 209/81/57/E1806/015/ FEW CU ALQDS 
LGT DSNT HZ WND L/V/ 8/107 58007 10082 20068

SUMMARY FOR SUNDAY, JULY 29, 2018 

TEMPERATURE (DEGREES F)
MAX.....82   NORMAL.....81
MIN.....67   NORMAL.....63
MEAN....75   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL.........................+3
TOTAL DEPARTURE FOR THE MONTH........................+84 [+2.7 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............10   DEPARTURE..........+3
TOTAL COOLING UNITS FOR THE MONTH.............278   DEPARTURE.........+70
TOTAL COOLING UNITS FOR THE SEASON............437   DEPARTURE........+100
TOTAL COOLING UNITS LAST SEASON TO DATE.......412   DEPARTURE.........+25

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................18 W AT  4:45 P.M.*
                   AERO.........................16 W AT  4:45 P.M.*
                   ASOS.........................19 W AT  3:21 P.M.
                   DAVIS........................19 W AT  3:20 P.M. RMY 18
FASTEST MILE FOR YESTERDAY......................13 W AT 10:10 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................15 W AT  4:26 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..................16 W AT  4:26 P.M.
AVERAGE WIND SPEED AND DIRECTION...............8.7 W
                   ASOS........................9.2
                   DAVIS.......................9.3 WNW [292 deg.]
*Last of several occurrences

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......+0.12
                         ASOS..............3.85 
TOTAL PRECIPITATION FOR THE YEAR..........34.01  DEPARTURE......+3.50
                         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 Low temp since midnight is 64F; 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 30
HIGH 99F IN 1949
LOW 51F IN 1956
PRECIP 1.84 INS IN 1976
PEAK GUST 70e MPH SW 1944

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

TODAY'S REPORT PREPARED BY: Jonathan O'Brien