BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, JULY 16, 2013 ALL TIMES ARE IN EASTERN STANDARD TIME TEMPERATURE REACHES 90F FOR 2ND DAY IN A ROW; HUMIDITY NOT AS BAD TODAY For the second consecutive day, the temperature has reached 90F on the summit. Today marks the 10th 90+ degree day so far this year at Blue Hill. Temperatures today are running very close to those of yesterday, a day which finished 10 degrees above the 30-year normal. The dew point temperature has fallen back into the upper 60s today, providing some slight relief from the 70+ degree dew points and very high humidity over the past few days. Winds continue to be rather low, and will likely average below 10 mph for the third day in a row. Today's Observations: 7 A.M. Weather: Clear, thin smoke layer distant all quadrants, hazy Temperature: 76F; Dew Point: 68F; Wind: NNW at 9 kts. Sea-level pressure: 30.16 ins. Hg, rising Visibility: 35 miles, hazy 6-hr min. temp: 71F BHO SA 1155 CLR 35 213/76/68/3309/016/ SKC THN K LYR DSNT ALQDS HAZY/ 8/000 53010 10076 20071 10 A.M. Weather: Clear, lone cumulus NNE, thin smoke layer distant all quadrants, hazy Temperature: 85F; Dew Point: 71F; Wind: Estimated NW at 2 kts, Wind: Light and variable Sea-level pressure: 30.16 ins. Hg, steady Visibility: 30 miles, hazy BHO SA 1455 CLR 30 213/85/71/E3202/016/ LONE CU NNE THN K LYR DSNT ALQDS HAZY WND LGT AND VRB/ 8/100 54000 1 P.M. Weather: Scattered cumulus, scattered altocumulus, few moderate cumulus and cumulus fractus all quadrants, altocumulus cumulogenitus distant S, thin smoke layer distant all quadrants, hazy Temperature: 89F; Dew Point: 67F; Wind: NW at 9 kts, Wind: Direction variable WNW-N Sea-level pressure: 30.14 ins. Hg, falling Visibility: 30 miles, hazy 6-hr max. temp: 90F BHO SA 1755 50 SCT 80 SCT 30 205/89/67/3209/014/ FEW MDT CU AND CUFRA ALQDS ACCG DSNT S THN K LYR DSNT ALQDS HAZY WND 29V35/ 8/260 58008 10090 20076 WEATHER SUMMARY FOR MONDAY, JULY 15, 2013 TEMPERATURE (DEGREES F) MAX.....91 NORMAL.....81 MIN.....72 NORMAL.....63 MEAN....82 NORMAL.....72 DEPARTURE FROM 30-YEAR NORMAL....................+10 TOTAL DEPARTURE FOR THE MONTH....................+67 [+4.3 DEGREES/DAY] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY................17 NW AT 1:17 P.M. AERO.....................16 NW AT 12:11 P.M. ASOS.....................17 NW AT 1:27 P.M. DAVIS....................16 NNW AT 12:11 P.M. RMY 18 FASTEST MILE FOR YESTERDAY..................11 NW AT 1:25 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...............13 NW AT 1:27 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..............12 NW AT 12:12 P.M. AVERAGE WIND SPEED AND DIRECTION...........6.7 NW ASOS....................6.4 DAVIS...................6.0 WNW [290 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE............-0.14 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........1.01 DEPARTURE............-0.79 ASOS..............1.00 TOTAL PRECIPITATION FOR THE YEAR..........33.21 DEPARTURE............+4.44 ASOS..............N/A* *ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals PRELIMINARY CLIMATE SUMMARY FOR JULY 2013 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust RMY: RMY = R.M. Young wind gust recording system added 8/9/2011 TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 7/1 82/69/76/+6/0.05/247/27 29 S AERO 31 MPH SSW RMY 32 7/2 82/61/72/+2/T/100/11 23 SSW AERO 23 MPH SSW RMY 25 7/3 87/62/75/+4/T/556/61 28 SW AERO 30 MPH SW RMY 30 7/4 90/71/81/+10/0.00/811/89 25 WSW AERO 26 MPH SW RMY 28 7/5 92/73/83/+12/0.00/874/96 24 W AERO 25 MPH WSW RMY 25 7/6 90/73/82/+11/0.00/836/92 25 WNW AERO 25 MPH WNW RMY 26 7/7 91/72/82/+11/0.21/508/56 38 SSW AERO 43 MPH SSW RMY 44 TSTM 7/8 82/64/73/+1/0.04/.../.. 18 NE AERO 20 MPH NE RMY 20 TSTM 7/9 72/63/68/-4/0.01/.../.. 14 ENE AERO 14 MPH ENE RMY 14 7/10 84/65/75/+3/T/.../.. 32 S AERO 36 MPH S RMY 35 7/11 79/69/74/+2/0.62/.../.. 23 W AERO 23 MPH W RMY N/A TSTM 7/12 70/62/66/-6/0.00/.../.. 29 NE AERO 29 MPH NE RMY 30 7/13 75/62/69/-3/0.08/.../.. 21 ENE AERO 20 MPH ENE RMY N/A 7/14 89/71/80/+8/0.00/.../.. 16 W AERO 16 MPH W RMY 16 7/15 91/72/82/+10/0.00/.../.. 17 NW AERO 16 MPH NW RMY 18 7/16 morning low temp: 71F; the normal low is now 63F DAILY RECORDS FOR JULY 2013 None so far. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JULY 16 HIGH 94F IN 1968, 1980, 1983, 1999 LOW 50F IN 1889, 1903 PRECIP 0.89 INS IN 1919 WIND 48e MPH SW 1944 RECORDS FOR JULY 17 HIGH 96F IN 1999 LOW 47F IN 1892 PRECIP 1.39 INS IN 1989 WIND 46 MPH WNW IN 1971 TODAY'S REPORT PREPARED BY: Sean Fankhauser