BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, JUNE 18, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME SUNSHINE WITH INCREASING HIGH CLOUDINESS TODAY TEMPERATURES AVERAGING WARMER THAN NORMAL Completely sunny skies this morning gave way to increasing amounts of middle and high cloudiness by this afternoon. Temperatures will again average warmer than normal for the 3rd day in a row but the cool weather of last week has cooled the monthly average to slightly below normal. Less than one quarter inch of rain has fallen since June 4th. Today's observations: 7 A.M. Weather: Clear, few cirrus distant S-NW Temperature: 65F, Dew point: 51F, Wind: N at 11G18 kts Sea-level pressure: 30.01 inches Hg, rising Visibility: 55 miles 6-hour min temp. 60F 24-hour precip: trace BHO SA 1155 CLR 55 163/65/51/0111G18/001/ FEW CI DSNT S-NW WND 34V06 WND GRDLY VEERING/ 8/001 51019 10069 20060 10 A.M. Weather: Thin scattered cirrus, cirrocumulus Temperature: 71F, Dew point: 47F, Wind: ENE at 09 kts Wind: Direction variability NNE-E Sea-level pressure: 30.06 inches Hg, rising Visibility: 60 miles, 70 miles NW BHO SA 1455 300 –SCT 60 179/71/47/0609/006/ FEW SML CU DSNT SSW-SW AC/FEW ACSL DSNT NW-NNE FEW CC LWR CI NNW-NE VSBY NW 70 WND 02V09/ 8/141 51016 1 P.M. Weather: High partly thin overcast, halo Temperature: 76F, Dew point: 51F, Wind: W at 08 kts Wind: Direction variability WSW-WNW Sea-level pressure: 30.03 inches Hg, falling Visibility: 60 miles, 70 miles NW 6-hour max. temp. 77 deg. BHO SA 1755 220 SCT E250 OVC 50 169/76/51/2608/003/ FEW AC NE-E DENSE CI ALQDS OVC PTLY THN HALO K LYR ALF N-SE WND 24V30/ 8/042 58010 10077 20065 WEATHER SUMMARY FOR SUNDAY, JUNE 17 TEMPERATURE (DEGREES F) MAX.....85 NORMAL.....76 MIN.....58 NORMAL.....56 MEAN....72 NORMAL.....66 DEPARTURE FROM 30-YEAR NORMAL............+6 TOTAL DEPARTURE FOR THE MONTH...........-16 (-1.1 DEGREES/DAY) HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............0 DEPARTURE.........-2 TOTAL HEATING UNITS FOR THE MONTH...........70 DEPARTURE........+13 TOTAL HEATING UNITS FOR THE SEASON........5901 DEPARTURE.......-452 TOTAL HEATING UNITS LAST SEASON TO DATE...5790 DIFFERENCE......+111 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............31 W AT 2:09 P.M. AEROVANE.............30 W AT 2:09 P.M. ASOS.................N/A # DAVIS................33 WSW AT 2:09 P.M. FASTEST MILE FOR YESTERDAY..............23 W AT 2:42 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE...........N/A # MAXIMUM 2-MINUTE DAVIS AVERAGE..........25 W AT 2:10 P.M. AVERAGE WIND SPEED AND DIRECTION....... 10.5 W ASOS.................N/A # DAVIS................11.2 WSW [240 deg] * last of several occurrences... # ASOS WINDS SWITCHED OFF BY NWS 6/6, IT IS NOT KNOWN WHEN THAT DATA WILL RESUME PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....trace DEPARTURE.....-0.14 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........1.97 DEPARTURE.....-0.28 ASOS..............1.97 TOTAL PRECIPITATION FOR THE YEAR..........26.13 DEPARTURE.....+2.14 ASOS.............25.61 PRELIMINARY CLIMATE SUMMARY FOR JUNE 2007......CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available 6/1 87/56/72/+10/0.12/660/73 45 NNW Aero 44 MPH TSTM AM/PM 6/2 87/64/76/+14/0.01/290/32 23 SSE TSTM PM 6/3 68/50/59/-3/0.14/000/000 24 NNE TSTM AM (no rain) 6/4 63/50/57/-6/1.52/000/00 35 NE TSTM 10:15-10:50 A.M. 6/5 78/57/68/+5/0.01/455/50 38 S 6/6 70/49/60/-3/0/637/70 35 W 6/7 69/44/57/-7/0/528/58 23 W 6/8 78/58/68/+4/0/748/82 20 WSW 6/9 63/54/59/-5/0.02/000/00 18 ENE 6/10 70/50/60/-4/0/831/91 22 ENE 6/11 77/62/70/+5/0.04/594/65 29 NE 6/12 70/56/63/-2/0.09/192/21 29 NNE 6/13 56/50/53/-12/0.01/000/00 42 NNE Aero 40 MPH NNE 6/14 59/49/54/-11/0/036/04 34 NNE 6/15 69/46/58/-8/0/.../.. 21 NNE 6/16 80/55/68/+2/0/.../.. 25 SW 6/17 85/58/72/+6/T/632/69 31 W 6/18 morning low temp. 60 deg.; normal now 57 deg. NEW DAILY RECORDS FOR JUNE: 6/4 - NEW RECORD DAILY RAINFALL OF 1.52 INS; THE PREVIOUS RECORD WAS 1.29 INS. IN 1898. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JUNE 18 HIGH 93F IN 1929,1994 LOW 39F IN 1920 PRECIP 3.36 INCHES 1998 PEAK GUST 48e MPH W IN 1943 RECORDS FOR JUNE 19 HIGH 92F IN 1923 LOW 40F IN 1920 PRECIP 3.92 INS 1922 PEAK GUST 66e MPH NW IN 1940 TODAY'S REPORT PREPARED By: Robert Skilling