BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, OCTOBER 5, 2013 ALL TIMES ARE IN EASTERN STANDARD TIME RAIN SHOWERS FRIDAY AND EARLY THIS MORNING MOSTLY CLOUDY WITH A FEW SUNNY BREAKS TODAY... Rain showers on Friday brought 0.26 inch of precipitation, and a light shower early this more left an additional 0.01 inch. This was the first precipitation of the month. The sky has been mostly cloudy all day with low and middle clouds lingering throughout the day. There have been only a few brief periods of sunshine by mid-afternoon. The last two days have also been remarkable for very light wind speeds. A total of only 101 miles of wind were recorded on Friday, which is an (uncorrected) daily average of 4.2 mph. The corrected mean wind speed for Friday was 5.2 mph. The peak gust on Friday of 18 mph NW occurred very early in the day. Later in the day, there were nine straight hours with average speeds of only 1 or 2 mph. The peak wind gust so far today has been only 9 mph, recorded several times. Today's Observations: 7 A.M. Weather: Broken stratocumulus (2 layers), broken altocumulus, few lower stratocumulus all quadrants, patchy ground fog all quadrants, rain shower distant SE, hazy Temperature: 57F; Dew Point: 55F; Wind: NE at 5 kts. Sea-level pressure: 30.11 ins. Hg, rising Visibility: 12 miles, hazy 6-hour min. temp: 56F 6-hour rainfall: 0.01 inch 24-hour rainfall: 0.27 inch BHO SA 1155 E35 BKN 60 BKN 75 BKN 12 198/57/55/0505/011/ FEW LWR SC ALQDS PTCHY GF ALQDS RW DSNT SE HAZY WND LGT/ 8/57/ 51007 6001/ 70027 10058 20056 10 A.M. Weather: Broken stratocumulus, overcast stratocumulus, few lower stratocumulus, breaks in overcast distant W-WNW, hazy Temperature: 62F; Dew Point: 57F; Wind: Estimated at ESE at 3 kts, Wind: Light and variable Sea-level pressure: 30.13 ins. Hg, rising Visibility: 25 miles, ESE-E 35 miles, hazy BHO SA 1455 E35 BKN 60 OVC 25 204/62/57/E1103/013/ FEW LWR SC ALQDS BINOVC DSNT W-WNW VSBY ESE-SE 35 HAZY WND LGT AND VRB/ 8/5// 50006 1 P.M. Weather: Scattered stratocumulus, broken stratocumulus (2 layers), few cumulus distant E-SE, few lower stratocumulus all quadrants, hazy Temperature: 65F; Dew Point: 56F; Wind: E at 5 kts, Wind: Light and variable Sea-level pressure: 30.10 ins. Hg, falling Visibility: 30 miles, hazy 6-hr max temp: 66F 6-hr min temp: 57F BHO SA 1755 30 SCT E45 BKN 60 BKN 30 193/65/56/0905/010/ FEW CU DSNT E-SE FEW LWR SC ALQDS WND LGT AND VRB HAZY/ 8/57/ 58011 10066 20057 WEATHER SUMMARY FOR FRIDAY, OCTOBER 4, 2013 TEMPERATURE (DEGREES F) MAX.....67 NORMAL.....65 MIN.....56 NORMAL.....47 MEAN....62 NORMAL.....56 DEPARTURE FROM 30-YEAR NORMAL......................+6 TOTAL DEPARTURE FOR THE MONTH.....................+33 [+8.1 DEGREES/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY..............0 DEPARTURE..........0 TOTAL COOLING UNITS FOR THE MONTH..............4 DEPARTURE.........+2 TOTAL COOLING UNITS FOR THE SEASON...........700 DEPARTURE.......+101 TOTAL COOLING UNITS LAST SEASON TO DATE......765 DIFFERENCE.......-65 HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............3 DEPARTURE.........-6 TOTAL HEATING UNITS FOR THE MONTH..............5 DEPARTURE........-31 TOTAL HEATING UNITS FOR THE SEASON...........151 DEPARTURE........-27 TOTAL HEATING UNITS LAST SEASON TO DATE......121 DIFFERENCE.......+30 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..................18 NW AT 12:20 A.M. * AERO.......................20 NW AT 12:13 A.M. * ASOS.......................20 WNW AT 12:20 A.M. DAVIS......................19 W AT 12:04 A.M. RMY N/A FASTEST MILE FOR YESTERDAY....................14 NW AT 12:06 A.M. * MAXIMUM 2-MINUTE ASOS AVERAGE.................15 WNW AT 12:06 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE................14 WNW AT 12:06 A.M. AVERAGE WIND SPEED AND DIRECTION.............5.2 NW ASOS......................3.5 DAVIS.....................4.3 NW [326 degrees] * last of several occurrences. PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.27 DEPARTURE.............+0.12 ASOS..............0.27 TOTAL PRECIPITATION FOR THE MONTH..........0.27 DEPARTURE.............-0.33 ASOS..............0.27 TOTAL PRECIPITATION FOR THE YEAR..........41.92 DEPARTURE.............+2.51 ASOS..............N/A* *ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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 10/1 75/50/63/+6/0.00/676/96 16 WNW AERO 16 MPH WNW RMY 18 10/2 78/56/67/+10/0.00/666/95 29 W AERO 30 MPH W RMY 29 10/3 77/56/67/+11/0.00/.../.. 20 WNW AERO 20 MPH WNW RMY N/A 10/4 67/56/62/+6/0.26/.../.. 18 NW AERO 20 MPH NW RMY N/A 10/5 the morning low temp: 56F; the normal low is now 47F DAILY RECORDS FOR OCTOBER 2013 None so far. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR OCTOBER 5 HIGH 86F IN 2007 LOW 29F IN 1965 PRECIP 3.17 INCHES IN 1962 PEAK GUST 64e MPH S IN 1979 RECORDS FOR OCTOBER 6 HIGH 83F IN 1990, 2007 LOW 26F IN 1965 PRECIP 3.78 INCHES IN 1962 PEAK GUST 60e MPH S IN 1942 TODAY'S REPORT PREPARED BY: Mike Iacono If you do not wish to receive this Daily Discussion and Climate Summary from the Blue Hill Observatory, please send an email to sitemaster@bluehill.org.