BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, JULY 25, 2013 ALL TIMES ARE IN EASTERN STANDARD TIME CLOUDY AND MUCH COOLER The temperature fell to 57F at the summit this morning, the lowest temperature observed so far this month. Cloudy skies have held temperatures below 65F through early this afternoon, with the high temperature for the day so far being 64F at midnight. A rain shower between 6:30 and 7:30 this morning left 0.02 inches of rain. Another shower began around 12:10 this afternoon and had left 0.03 inches of rain by the 1:00 P.M. EST observation. Winds have been steady out of the NE with a few gusts over 20 mph. Visibility has been limited at times by rain and low clouds, but the drier air allowed visibility to climb up to 65 miles to the NW this morning. Despite today's cooler temperatures, July continues to be a very warm month with only 3 days thus far having below average temperatures, though that number will grow to 4 today. The month remains in a tie for the third greatest amount of 90 degree days in a month. BHO Greatest Number of 90-Degree Days per Month, (1885-2013) 1) 14 in July 1952 2) 13 in August 2002 3) 10 in August 1944 10 in July 1949 10 in July 1963 10 in July 2010 10 in July 2013 (through 7/24) 8) 9 in July 1911 9 in August 1928 10) 8 in August 1949 8 in July 1963 8 in July 1988 Today's Observations: 7 A.M. Weather: Light rain, broken stratocumulus, overcast altostratus, few stratus fractus Temperature: 57F; Dew Point: 54F; Wind: NE at 10G18 kts, Wind: Direction variable N-E Sea-level pressure: 30.05 ins. Hg, rising Visibility: 30 miles, except 20 miles SSW-SW and NE, 65 miles NW, light rain 24-hr precip: 0.02 inch 6-hr precip: 0.02 inch 6-hr min. temp: 57F BHO SA 1155 E30 BKN 85 OVC 30R- 176/57/54/0410G18/005/ FEW STFRA VSBY SSW-SW AND NE 20 NW 65 WND 01V08/ 8/87/ 52014 ASOS 70001 MANUAL 70002 ASOS 60001 MANUAL 60002 10060 20057 10 A.M. Weather: Broken stratocumulus, overcast altostratus, rain shower WSW-SW Temperature: 60F; Dew Point: 55F; Wind: NE at 9 kts Sea-level pressure: 30.09 ins. Hg, rising then rising more slowly Visibility: 50 miles, except 65 miles NW 3-hr. precip: Trace BHO SA 1455 E30 BKN 85 OVC 50 188/60/55/0409/009/ SHRA WSW-SW VSBY NW 65 WND 01V08/ 8/57/ 51012 MANUAL 6000/ 1 P.M. Weather: Light rain, broken stratus fractus, overcast stratocumulus, rain began 12:10 P.M. EST Temperature: 60F; Dew Point: 58F; Wind: NNE at 10G16 kts, Wind: Direction variable N-E Sea-level pressure: 30.09 ins. Hg, rising then falling Visibility: 10 miles, except 20 miles WSW-NW, light rain 6-hr precip: 0.03 inch 6-hr max. temp: 62F BHO SA 1755 15 SCT E25 OVC 10R- 189/60/58/0310G16/009/ R-B10 VSBY WSW-NW 20 WND 01V08/ 8/5// 50001 MANUAL 60003 ASOS 60003 10062 20057 WEATHER SUMMARY FOR WEDNESDAY, JULY 24, 2013 TEMPERATURE (DEGREES F) MAX.....84 NORMAL.....81 MIN.....64 NORMAL.....63 MEAN....74 NORMAL.....72 DEPARTURE FROM 30-YEAR NORMAL......................+2 TOTAL DEPARTURE FOR THE MONTH....................+133 [+5.3 DEGREES/DAY] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY................23 N AT 10:59 P.M. AERO.....................23 N AT 9:21 P.M. ASOS.....................23 N AT 9:21 P.M. DAVIS....................21 N AT 9:20 P.M. RMY 23 FASTEST MILE FOR YESTERDAY..................15 N AT 10:42 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE...............16 N AT 11:36 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..............N/A AVERAGE WIND SPEED AND DIRECTION...........8.3 WNW ASOS....................8.1 DAVIS...................7.0 WNW [294 deg.] * last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.02 DEPARTURE............-0.11 ASOS..............0.01 TOTAL PRECIPITATION FOR THE MONTH..........1.85 DEPARTURE............-1.14 ASOS..............1.84 TOTAL PRECIPITATION FOR THE YEAR..........34.05 DEPARTURE............+4.09 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/+1/0.04/617/68 18 NE AERO 20 MPH NE RMY 20 TSTM 7/9 72/63/68/-4/0.01/054/06 14 ENE AERO 14 MPH ENE RMY 14 7/10 84/65/75/+3/T/335/37 32 S AERO 36 MPH S RMY 35 7/11 79/69/74/+2/0.62/009/01 23 W AERO 23 MPH W RMY N/A TSTM 7/12 70/62/66/-6/0.00/162/18 29 NE AERO 29 MPH NE RMY 30 7/13 75/62/69/-3/0.08/009/01 21 ENE AERO 20 MPH ENE RMY N/A 7/14 89/71/80/+8/0.00/477/53 16 W AERO 16 MPH W RMY 16 7/15 91/72/82/+10/0.00/665/74 17 NW AERO 16 MPH NW RMY 18 7/16 91/71/81/+9/0.00/843/94 18 NNW AERO 16 MPH NNW RMY 16 7/17 93/74/84/+12/0.00/841/94 22 SW AERO 23 MPH SW RMY 25 7/18 90/75/83/+11/0.00/724/81 20 S AERO 21 MPH S RMY 22 7/19 95/76/86/+14/0.00/723/81 36 WSW AERO 38 MPH WSW RMY 38 7/20 93/72/82/+10/0.00/570/64 29 W AERO 30 MPH W RMY 31 TSTM 7/21 82/68/75/+3/0.00/.../.. 16 NE AERO 16 MPH NE RMY 17 7/22 80/67/74/+2/T/.../.. 17 NE AERO 17 MPH NE RMY 19 TSTM 7/23 82/68/75/+3/0.82/.../.. 35 WSW AERO 36 MPH WSW RMY 39 TSTM 7/24 84/64/74/+2/0.00/.../.. 23 N AERO 23 MPH N RMY 23 7/25 morning low temp: 57F; the normal low is now 63F DAILY RECORDS FOR JULY 2013 7/14 - TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 71F; ties previous record of 71F set in 1997 7/15 - NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 72F; surpasses previous record of 70F set in 1901, 1934, 1995 7/16 - TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 71F; ties previous record of 71F set in 1901, 1958, 1968 7/17 - TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 74F; ties previous record of 74F set in 1900 7/18 - NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 75F; surpasses previous record of 73F set in 1900, 1999 7/19 - NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 76F; surpasses previous record of 72F set in 1949, 1991, 2005 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JULY 25 HIGH 94F IN 1963,1987 LOW 51F IN 1901,1953 PRECIP 2.25 INCHES IN 1990 PEAK GUST 88 MPH NW IN 1972 RECORDS FOR JULY 26 HIGH 97F IN 1963 LOW 47F IN 1920 PRE 2.05 INS IN 1899 WIND 74e MPH NNW IN 1940 TODAY'S REPORT PREPARED BY: Jonathan O'Brien, Mark Medlinskas, and Kevin Pecora