BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, JULY 2, 2010 ALL TIMES ARE IN EASTERN STANDARD TIME STARTING JULY ON A COOL NOTE ONE LAST COOL, DRY DAY BEFORE WARMTH RETURNS THIS WEEKEND With fewer clouds today, the afternoon temperature has been able to warm a little more compared to yesterday. The high for today through 1PM EST is 77F, with a morning low of 54F. For the third day in a row temperatures are running on the cool side. With dew point temperatures in the 45-50 degree range, the air feels quite comfortable. The past three days of cool, comfortable conditions will be coming to an end this weekend as temperatures warm into the 80s and moisture increases. Visibility has been spectacular again today. It has been around 75 miles all day! The average temperature for the month of June tied for the 8th warmest. June also marked the sixth consecutive month of above average temperatures. JUNE SUMMARY Mean temperature: 68.8 (3.1 degrees above average) 67.8 (corrected to 24 hours) Average maximum temperature: 78.6F Average minimum temperature: 58.9F Maximum temperature: 91F on June 28 Minimum temperature: 49F on June 9 Heating Degree Days June: 37 (37 below average) Season: 5,678 (693 below average) Cooling Degree Days June: 157 (64 above average) Season: 211 (93 above average) Precipitation: 2.68 inches (1.25 below normal) Prevailing wind: 10.4 (uncorr) mph South (17%) 10.9 (corr) Peak Gust: 63 mph SSW on June 20 Sunshine: 14,356 min. (astronomical) 52% Sunshine: 13,800 min. (card minutes) 52% Warmest June corrected mean temperature (degrees F) 1. 68.7 1999 2. 68.5 2001 3. 68.3 1925 68.3 1930 5. 68.2 1994 6. 68.0 1943 7. 67.9 1976 8. 67.8 2008 67.8 2010 10. 67.7 1949 Today's observations: 7 A.M. Weather: Clear, few cumulus distant east thru east-southeast, few altocumulus lenticularus distant west-northwest, few high thin cirrus north-northeast thru south-southeast Temperature: 62F, Dew point: 49F; Wind: NW at 8 kts, Sea-level pressure: 30.18 inches Hg, rising Visibility: 75 miles 6-hour minimum temp: 54F BHO SA 1155 CLR 75 221/62/49/3108/018/ FEW CU DSNT E-ESE FEW ACSL DSNT WNW FEW HI THN CI NNE-SSE/ 8/141 53017 10062 20054 10 A.M. Weather: Scattered cumulus, scattered cirrus, few moderate cumulus, cirrus northwest thru north-northeast, mostly clear sky distant north-northeast thru east-southeast Temperature: 70F, Dew point: 46F; Wind: NW at 9 kts, Wind: Variable W to N Sea-level pressure: 30.18 inches Hg, falling slightly Visibility: 75 miles BHO SA 1455 55 SCT 250 SCT 75 220/70/46/3209/018/ FEW MDT CU CI NW-NNE MSTLY CLR SKY DSNT NNE-ESE WND 27V36/ 8/201 58001 1 P.M. Weather: Scattered cumulus/stratocumulus, scattered cirrus, few moderate cumulus, mostly clear sky north-northeast thru east-southeast Temperature: 75F, Dew point: 47F; Wind: NW at 07G15 kts, Wind: Variable WSW to NNE Sea-level pressure: 30.16 inches Hg, falling Visibility: 75 miles 6-hourly temp: 77F BHO SA 1755 60 SCT 250 SCT 75 214/75/47/3207G15/016/ FEW MDT CU MSTLY CLR SKY NNE-ESE WND 24V03/ 8/201 58006 10077 20062 WEATHER SUMMARY FOR THURSDAY, JULY 1 TEMPERATURE (DEGREES F) MAX.....74 NORMAL.....79 MIN.....53 NORMAL.....60 MEAN....64 NORMAL.....70 DEPARTURE FROM 30-YEAR AVERAGE................-6 TOTAL DEPARTURE FOR THE MONTH.................-6 [-5.8 DEGREES/DAY] HEATING DEGREE DAYS (Through June 30) TOTAL HEATING UNITS FOR YESTERDAY.............0 DEPARTURE........-1 TOTAL HEATING UNITS FOR THE MONTH............37 DEPARTURE.......-37 TOTAL HEATING UNITS FOR THE SEASON.........5678 DEPARTURE......-693 TOTAL HEATING UNITS LAST SEASON TO DATE....6238 DIFFERENCE.....-560 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............30 W AT 3:12 P.M. * AEROVANE..............30 W AT 1:04 P.M. * ASOS..................30 WNW AT 3:13 P.M. DAVIS.................31 W AT 1:06 P.M. THE FASTEST MILE FOR YESTERDAY...........22 W AT 2:58 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE............21 WNW AT 3:14 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........23 W AT 3:14 P.M. AVERAGE WIND SPEED AND DIRECTION........13.1 W ASOS.................12.4 DAVIS................12.6 W [273 DEG] * last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M... 0.00 DEPARTURE........-0.13 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........0.00 DEPARTURE........-0.13 ASOS..............0.00 TOTAL PRECIPITATION FOR THE YEAR..........36.09 DEPARTURE.......+10.29 ASOS.............35.82 ** ** ASOS missing rainfall due to system failure on 6/24-25 PRELIMINARY CLIMATE SUMMARY FOR JULY 2010 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/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 7/1 74/53/64/-6/0.00/.../.. 30 W AERO 30 MPH W 7/2 our morning low temp: 54F; the normal low is now 60F NEW DAILY RECORDS FOR JULY 2010 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JULY 2 HIGH 95F IN 1963 LOW 47F IN 1988 PRECIP 1.42 INS IN 1986 PEAK GUST 45 MPH SW IN 1999 RECORDS FOR JULY 3 HIGH 99F IN 1911 LOW 47F IN 1914 PRECIP 1.36 IN 1985 PEAK GUST 52 MPH NW IN 1963 TODAY'S REPORT PREPARED BY: Sean Fankhauser