BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, MAY 14, 2010 ALL TIMES ARE IN EASTERN STANDARD TIME LIGHT SHOWERS BRING 0.04 INCH OF RAIN Light showers overnight brought just 0.04 inch of rain. Only a trace of rain fell as very light drizzle between 8AM and 10AM EDT this morning. Some sunshine started to burn through the haze by about 3:00 PM EDT today. It is very hazy this afternoon with visibility reduced to 10 miles. The month of May is now just over 4 degrees above normal, after running 14 degrees above normal during the first week of the month. Today's observations: 7 A.M. Weather: Scattered stratus, overcast nimbostratus, thin fog Temperature: 48F, Dew point: 47F, Wind: S at 9 kts Sea-level pressure: 30.12 inches Hg, falling Visibility: 8 miles, thin fog 6-hour minimum temp: 48F 24-hour precip: 0.04 in. BHO SA 1155 20 SCT E25 OVC 8 199/48/47/1709/012/ THN FG/ 8/72/ 58014 MANUAL 6004/ ASOS 60004 MANUAL 70004 ASOS 70004 10053 20048 10 A.M. Weather: Overcast stratus, fog Temperature: 50F, Dew point: 49F, Wind: SSW at 10 kts Sea-level pressure: 30.09 inches Hg, falling Visibility: 3 miles, fog 3-hour precip: trace BHO SA 1455 E8 OVC 3F 191/50/49/95/2010/009/ 8/6// 56008 MANUAL 6000/ 1 P.M. Weather: Scattered stratus, broken stratocumulus, hazy Temperature: 58F, Dew point: 54F, Wind: SSW at 7 kts, Wind: Direction variable S to W Sea-level pressure: 30.003 inches Hg, falling Visibility: 10 miles, hazy 6-hour precip: trace 6-hour max. temp: 60F BHO SA 1755 10 SCT E30 BKN 10 170/58/54/2107/003/ HAZY WND 17V26/ 8/537 58021 MANUAL 6000/ 10060 20048 WEATHER SUMMARY FOR THURSDAY, MAY 13 TEMPERATURE (DEGREES F) MAX.....66 NORMAL.....66 MIN.....40 NORMAL.....46 MEAN....53 NORMAL.....56 DEPARTURE FROM 30-YEAR AVERAGE................-3 TOTAL DEPARTURE FOR THE MONTH................+57 [+4.2 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............12 DEPARTURE........+3 TOTAL HEATING UNITS FOR THE MONTH...........106 DEPARTURE.......-41 TOTAL HEATING UNITS FOR THE SEASON.........5588 DEPARTURE......-585 TOTAL HEATING UNITS LAST SEASON TO DATE....6003 DIFFERENCE.....-415 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............24 WNW AT 1:21 P.M. AEROVANE..............23 WSW AT 3:34 P.M. * ASOS..................24 NNW AT 1:21 P.M. DAVIS.................24 WNW AT 1:21 P.M. THE FASTEST MILE FOR YESTERDAY...........17 WSW AT 4:43 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE............18 WNW AT 1:21 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........18 W AT 2:40 P.M. AVERAGE WIND SPEED AND DIRECTION........10.1 WSW ASOS..................9.8 DAVIS.................9.5 WNW [282 DEG] * last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.04 DEPARTURE......-0.08 ASOS..............0.04 TOTAL PRECIPITATION FOR THE MONTH..........0.80 DEPARTURE......-0.82 ASOS..............0.79 TOTAL PRECIPITATION FOR THE YEAR..........31.16 DEPARTURE.....+11.59 ASOS.............31.24 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.......0.0 TOTAL SNOWFALL FOR THE MONTH................0.0 DEPARTURE......-0.1 TOTAL SNOWFALL FOR THE SEASON..............64.4 DEPARTURE......+4.3 PRELIMINARY CLIMATE SUMMARY FOR MAY 2010 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 5/1 81/58/70/+18/0.00/0.0/684/81 29 SE 5/2 87/56/72/+20/0.00/0.0/432/51 29 SSW 5/3 80/62/71/+18/T/0.0/170/20 41 W AERO 50 MPH W 5/4 81/52/67/+14/0.09/0/562/66 51 WNW AERO 58 MPH WNW TSTM 5/5 78/50/64/+11/0.00/0/845/99 28 S 5/6 76/54/65/+11/T/0/531/62 46 WNW AERO 48 MPH WNW 5/7 72/47/60/+6/0.00/0/798/93 28 W 5/8 63/45/54/0/0.63/0/034/04 39 WSW AERO 39 MPH WSW TSTM 5/9 53/37/45/-10/0.00/0/717/83 46 W AERO 50 MPH W 5/10 57/35/46/-9/0.00/0/831/96 31 WNW AERO 35 MPH WNW 5/11 57/34/46/-9/0.00/0/625/72 22 SSE 5/12 50/41/46/-10/T/0.0/000/00 22 S 5/13 66/40/53/-3/0.00/0.0/.../.. 24 WNW 5/14 our morning low temp: 48F; the normal low is now 46F NEW DAILY RECORDS FOR MAY 2010 5/1 - minimum temp. of 58F equals record high minimum for the date set in 2001 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MAY 14 HIGH 85F IN 1961 LOW 33F IN 1895 PRECIP 1.93 INCHES IN 2006 PEAK GUST 53 MPH S IN 2009 RECORDS FOR MAY 15 HIGH 93F IN 1900 LOW 36F IN 1947,1985 PRECIP 1.63 INCHES IN 1978 PEAK GUST 53e MPH NE IN 1978, W 2002 TODAY'S REPORT PREPARED BY: Stephanie Radner