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Sunday, November 16, 2025

November 16, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SUNDAY, NOVEMBER 16, 2025 ALL TIMES ARE…

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BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SUNDAY, NOVEMBER 16, 2025 ALL TIMES ARE IN EASTERN STANDARD TIME (EST) SUNRISE: 0637E SUNSET:  1621E FIRST MEASURABLE FROZEN PRECIP LAST EVENING FROM SLEET, MILD BUT BLUSTERY TODAY…. We had our first measurable frozen precipitation of the season last evening as sleet was mixed with the rain for the first hour and a half after the onset of the precipitation. 0.1″ of sleet was able to accumulate before changing to all rain just after 9pm. Rain continued into the very early morning hours of this morning with a total of 0.56″ of water measured in the gauge. Once the rain ended just after 4am this morning, clouds quickly broke allowing for some sunshine this morning. However, as day- time heating takes place along with increasing cold air advection, clouds have once again filled the sky by late this morning and into early this afternoon. Some showers have also developed from all the instability. Temperatures warmed into the low 50s by late this morning, but are starting to fall off a bit early this afternoon thanks to the cold air advection. Dew points values that held in the mid 40s all morning, are not dropping into the low 30s early this afternoon. The wind has also picked up quite a bit thanks to the above mentioned cold air advection. A westerly wind has increased from around 10mph this morning to 20-30mph by early this afternoon. Gusts have increased in frequency and intensity as we pushed into the late morning hours. Values have been regularly exceeding 40mph. The peak gust for the day so far is 48mph, which occurred after 12:30pm. Visibility has continued to improve as the day progressed. We started with about 25 miles and finished at around 70 miles by early this afternoon. The maximum temperature so far today is 52F degrees, which is 2 degrees above the normal high of 50F. The minimum temperature since midnight is 37F degrees, which is 3 degrees above the normal low of 34F. ————————————————————– Today’s Observations: 7 A.M. Weather: Broken altocumulus/altostratus, overcast cirrostratus, few breaks in overcast all quadrants Temperature: 45F; Dew Point: 45F; Relative Humidity: 99% Wind: W @ 14G21 kts Sea-level pressure: 986.1 mb; 29.12 in. Hg: falling, then rising Visibility: 25 miles, thin fog 6-hr Max temp: 46F 6-hr Min temp: 39F 24-hr Precip: 0.56 inches 24-hr Snowfall: 0.1 inches BHO SA 1155 E120 BKN 220 OVC 25 861/45/45/2714G21/912/ FEW BINOVC ALQDS THN F ALQDS TOTAL NEW SNW PAST 24 HRS 0.1 INS/ 8/077 53007 6014/ 70056 10046 20039 10 A.M. Weather: Scattered stratocumulus, scattered altocumulus, scattered cirrostratus, scattered cirrus, virga distant SW-NNW Temperature: 51F; Dew Point: 45F; Relative Humidity: 80% Wind: W @ 14G25 kts, peak wind W 31mph at 9:27 A.M. Sea-level pressure: 985.4 mb; 29.10 in. Hg: falling, then more slowly Visibility: 50 miles 3-hr Precip: 0.00 inches 3-hr Snowfall: 0.0 inches BHO SA 1455 25 SCT 120 SCT 220 SCT 250 SCT 50 854/51/45/2814G25/910/ VIRGA DSNT SW-NNW PK WND 2727/27/ 8/558 56007 1 P.M. Weather: Broken stratocumulus, broken altocumulus, virga distant NW-ENE and distant ESE-SE and distant SSW-WSW Temperature: 48F Dew Point: 32F; Relative Humidity: 52% Wind: WNW @ 26G40 kts, peak wind WNW 48mph at 12:38 P.M. Sea-level pressure: 985.7 mb; 29.11 in. Hg: rising, then steady Visibility: 70 miles 6-hr Max temp: 52F 6-hr Min temp: 45F 6-hr Precip: Trace 6-hr Snowfall: 0.0 inches BHO SA 1755 E45 BKN 100 BKN 70 857/48/32/2926G40/911/ VIRGA DSNT NW-ENE AND DSNT ESE-SE AND DSNT SSW-WSW PK WND 2942/38/ 8/560 51003 6000/ 10052 20045 ————————————————————– SUMMARY FOR SATURDAY, NOVEMBER 15, 2025 TEMPERATURE (DEGREES F) MAX…….44   NORMAL…..50 MIN…….28   NORMAL…..34 MEAN……36   NORMAL…..42 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-6 TOTAL DEPARTURE FOR THE MONTH………………………-12 [-1.0 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026) TOTAL HEATING UNITS FOR YESTERDAY…………….29  DEPARTURE……..+6 TOTAL HEATING UNITS FOR THE MONTH……………319  DEPARTURE…….+11 TOTAL HEATING UNITS FOR THE SEASON…………..730  DEPARTURE…….-90 TOTAL HEATING UNITS LAST SEASON TO DATE………619  DEPARTURE……+111 COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025) TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE………0 TOTAL COOLING UNITS FOR THE MONTH……………..0  DEPARTURE………0 TOTAL COOLING UNITS FOR THE SEASON…………..756  DEPARTURE…….+79 TOTAL COOLING UNITS LAST SEASON TO DATE………768  DEPARTURE…….-12 PEAK WIND GUST (MPH): Note: Instruments designated #1 = Main Tower, #2 = South Tower, F420C, Contacting, Merlin, and Richards are all on Main Tower. E=Estimated *=Last of multiple occurrences F420C (Official)………..26 SSE  @   11:59 P.M. VECTOR #1 (1-Sec)……….26 SSE  @   11:59 P.M. VECTOR #2 (1-Sec)……….26 SSE  @   11:59 P.M. DAVIS #1……………….25 S    @   10:26 P.M. DAVIS #2 ………………31 S    @   11:59 P.M. RMY #1 (Instantaneous)…..26 SSE  @   11:42 P.M. RMY #2 (Instantaneous)…..27 SSE  @   11:59 P.M. MERLIN………………….M RICHARDS (C5C) (Inst)……25 SSE  @   11:42 P.M. FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL………………18 SSE  @   11:43 P.M. MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..19 SSE  @   11:59 A.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..20 SSE  @   11:59 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 S    @   10:33 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 S    @   10:10 P.M. MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 SSE  @   11:43 P.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 SSE  @   11:59 P.M. MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………18 SSE  @   11:43 P.M. AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL………8.8 NW [212 total miles] VECTOR #1……………….9.5 VECTOR #2………………10.1 DAVIS #1………………..9.5 W DAVIS #2………………….M RMY #1………………….9.3 W RMY #2…………………10.0 W RICHARDS (C5C)…………..9.7 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.56 DEPARTURE…..+0.42 TOTAL PRECIPITATION FOR THE MONTH…………..1.61 DEPARTURE…..-0.56 TOTAL PRECIPITATION FOR THE YEAR (2025)…….43.92 DEPARTURE…..-2.41 SNOWFALL (INCHES) THROUGH THIS MORNING (EST): TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.1 DEPARTURE……0.0 TOTAL SNOWFALL FOR THE MONTH………………..0.1 DEPARTURE…..-0.5 TOTAL SNOWFALL FOR THE SEASON (2025-2026)…….0.1 DEPARTURE…..-1.2 ————————————————————– PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST PEAK GUST: F420C (Official) VEC1: Vector #1 1-second gust RMY:  R.M. Young #1 wind gust recording system (Instantaneous) TSTM: Thunderstorm day (thunder heard some time during day) ….: Data not yet available, records not finalized M:    Missing data 11/1  56/38/47/+0/0.00/0.0/619/100       50 W   VEC1 50 W   RMY 50 11/2  53/33/43/-4/0.00/0.0/617/100       23 WNW VEC1 23 WNW RMY 24 11/3  54/42/48/+2/0.16/0.0/012/02        41 WNW VEC1 41 W   RMY 46 11/4  54/42/48/+2/0.00/0.0/605/99        52 NW  VEC1 52 NW  RMY 54 11/5  56/39/48/+2/0.06/0.0/091/15        50 W   VEC1 47 W   RMY 52 11/6  50/34/42/-3/0.02/T/449/74          48 WNW VEC1 48 WNW RMY 49 11/7  52/31/42/-3/0.04/0.0/448/74        43 SSW VEC1 42 SSW RMY 47 11/8  60/45/53/+8/0.18/0.0/307/51        32 WNW VEC1 33 WNW RMY 33 11/9  61/46/54/+10/0.15/0.0/216/36       33 ESE VEC1 34 ESE RMY 35 11/10 54/36/45/+1/0.44/0.0/000/00        32 W   VEC1 31 W   RMY 31 11/11 37/30/34/-9/T/T/131/22             46 WNW VEC1 44 WNW RMY 47 11/12 44/30/37/-6/T/T/148/25             32 W   VEC1 32 W   RMY 33 11/13 47/32/40/-3/T/0.0/…/..           32 NW  VEC1 32 NW  RMY 34 11/14 46/32/39/-3/0.00/0.0/…/..        30 NNW VEC1 30 NNW RMY 30 11/15 44/28/36/-6/0.37/0.1/…/..        26 SSE VEC1 26 SSE RMY 26 11/16 The low since midnight is 37F, the daily normal low is 34F. ————————————————————– NOVEMBER DAILY RECORDS TO DATE NONE. ————————————————————– DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR NOVEMBER 16 HIGH 73 IN 1927 LOW 8 IN 1933 PRECIP 2.25 INCHES IN 1981 SNOWFALL 2.0 IN 1913 PEAK GUST 78 S IN 1989 RECORDS FOR NOVEMBER 17 HIGH 74 IN 1928 LOW 10 IN 1924 PRECIP 1.92 INCHES IN 1920 SNOWFALL 1.0 INS IN 1980 PEAK GUST 61 SSE IN 2006 TODAY’S REPORT PREPARED BY: Matt Douglas
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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
Part I — Data Use Policy
§ 01

Ownership and Proprietary Rights

All observational records, compiled datasets, metadata, database structures, and related materials provided by the Blue Hill Observatory & Science Center are the exclusive property of the Blue Hill Observatory & Science Center. The Observatory has maintained continuous weather observations at the summit of Great Blue Hill since 1885, and the entirety of that record — its compilation, structure, curation, and organization — constitutes a proprietary database protected under applicable United States law, including copyright law and common law database protections.

All rights not expressly granted in this Policy are reserved by the Observatory. No access to or use of Observatory data shall be construed as a waiver of any rights or as a license to use data beyond the scope expressly stated herein.

§ 02

Governing Law and Jurisdiction

This Policy shall be governed by and construed in accordance with the laws of the Commonwealth of Massachusetts, without regard to its conflict of law provisions. For interactions with international users, this Policy shall apply to the maximum extent permitted by applicable local law.

Any dispute arising from or related to this Policy shall be subject to the exclusive jurisdiction of the state and federal courts located in Norfolk County, Massachusetts. By accessing Observatory data, all users consent to personal jurisdiction in Massachusetts and waive any objection to the venue or inconvenience of such forum.

§ 03

Permitted Uses

Observatory data are made available for the following limited, non-commercial purposes only:

  • Personal study and analysis
  • Educational classroom use
  • Student projects
  • Non-commercial academic research
  • Publication of analyses, figures, models, or conclusions derived from the data, subject to the attribution requirements of Section 4

All other uses require prior written authorization from the Observatory.

§ 04

Attribution Requirement

Any use of Observatory data in any published, presented, or publicly distributed work must include the following verbatim acknowledgment:

“Data provided by the Blue Hill Observatory & Science Center, Milton, Massachusetts. Continuous weather observations since 1885.”

Failure to include proper attribution is a material violation of this Policy.

§ 05

Prohibited Uses

Unless explicitly authorized in writing, Users may not:

  • Resell, license, sublicense, or commercially exploit Observatory data in any form
  • Redistribute the dataset in whole or in part to any third party
  • Publish the dataset for download by third parties
  • Host, mirror, or archive the dataset on any external website, repository, or storage service
  • Upload the dataset to any public or institutional data repository
  • Provide the data through APIs, automated services, or subscription platforms
  • Incorporate the data into any commercial product, software, application, or service
  • Use the data for AI or machine learning systems intended for commercial use or external distribution
  • Use the data to create derivative datasets that enable reconstruction of the underlying observations
§ 06

Commercial Licensing

Organizations seeking to use Observatory data for commercial purposes must obtain a license prior to any such use. Licensing inquiries: data@bluehill.org.

§ 07

Automated Access

Automated scraping, bulk harvesting, or systematic downloading of Observatory data is strictly prohibited without prior written authorization.

§ 08

Enforcement and Remedies

Violation of this Policy may result in immediate revocation of data access, pursuit of legal remedies available under United States law, and referral to applicable authorities. The Observatory reserves all rights to seek injunctive relief, damages, and attorneys’ fees in connection with any unauthorized use of its data.

Part II — Privacy Policy
§ 09–10

Scope & Information Collected

This section governs the collection, use, storage, and disclosure of personal information from visitors to the Blue Hill Observatory website and users of its data services. The Observatory may collect contact information (name, email, organization) when voluntarily submitted, usage data including IP addresses and pages visited, and data download records.

§ 11–12

How We Use Information & Retention

Information is used solely for: responding to inquiries and licensing requests; monitoring and enforcing compliance with this Policy; improving website performance; and communicating Observatory news to opted-in users. The Observatory does not sell, rent, or share personal information with third parties for marketing purposes. Data access records may be retained indefinitely for compliance and enforcement purposes.

§ 13

International Users and Data Transfers

The Observatory is located in the United States. International users acknowledge their information will be processed in the United States under U.S. law. Users requiring specific data processing agreements under non-US law must contact data@bluehill.org before accessing data.

§ 14–16

Cookies, Security & Children’s Privacy

The Observatory website may use cookies for analytics and functionality. By continuing to use the site, users consent to cookie use. The Observatory implements reasonable measures to protect personal information but cannot guarantee absolute security. Observatory data services are not directed at children under 13.

Part III — General Provisions
§ 17–20

Modifications, Severability, Entire Agreement & Contact

The Observatory reserves the right to modify this Policy at any time. Updated versions will be posted at bluehill.org. Continued use of Observatory data following any modification constitutes acceptance of the revised Policy. This Policy constitutes the entire agreement between the User and the Observatory. Questions and licensing inquiries: Blue Hill Observatory & Science Center, Milton, Massachusetts — data@bluehill.org

By accessing, downloading, or using any Blue Hill Observatory data or services, you acknowledge that you have read, understood, and agree to be bound by this Policy.
Effective January 1, 2025 · Blue Hill Observatory & Science Center · Milton, Massachusetts
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