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Friday, May 1, 2026

May 1, 2026

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA FRIDAY, MAY 1, 2026 ALL TIMES ARE…

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BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA FRIDAY, MAY 1, 2026 ALL TIMES ARE IN EASTERN STANDARD TIME (EST) SUNRISE: 0439E SUNSET:  1844E PLENTY OF SUNSHINE TODAY UNDER PARTLY CLOUDY SKIES WITH A STEADY NORTHWESTERLY FLOW…. Today started with mostly cloudy skies and a chilly wind out of the northwest. Fortunately, we have had plenty of sunshine to warm things up and there has been a decrease in cloudiness making this a beautiful start to the month. Temperatures started in the upper 40’s today with an overnight low of 43F. Temperatures have increased nicely and almost hitting normal for this time of year, with a maximum of 61F so far for the day. Dew points were in the mid to upper 30’s throughout the day as well. Winds have been steady out of the northwest for much of the day. There has been a slight shift to the west-northwest by the early afternoon. The average speed for the day so far is around 12mph with gusts in the 18-21mph range. The peak gust so far is 28mph, which occurred at 8:20am this morning. Visibility has been a beautiful 70-80 miles today, with visibility increasing as the afternoon approached. Crisp blue skies and cooler air have helped. The maximum temperature so far today is 61F degrees, which is 2 degrees below the normal high of 63F. The minimum temperature since midnight is 43F degrees, which is 1 degree below the normal temperature of 44F. ————————————————————– PRELIMINARY STATS FOR APRIL 2026 TEMPERATURE, Deg. F Avg. Max. 57.5 [+1.2] Avg. Min. 37.7 [-0.2] Mean      47.6 [+0.5] 24-hour corrected mean: 46.8 Max. for month: 83F on the 14th Min. for month: 25F on the 8th HEATING DEGREE DAYS Total heating units:    518 [-022] Total for the season:  5836 [-051] Total for last season: 5398 COOLING DEGREE DAYS Total cooling units:      6 [+003] Total for the season:     6 [+003] Total for last season:    3 PRECIPITATION, Inches Total: 2.00 [-2.76] Greatest in 24 hrs: 0.54 on the 1st-2nd SNOWFALL, Inches Total: Trace [-2.8] Greatest in 24 hrs: Trace on the 7th, 19th, 20th WIND, mph Avg. uncorrected wind speed: 10.2 mph Avg. corrected wind speed:   10.8 mph Prevailing wind direction:   East-Northeast [16%] Peak gust and direction:     46 WNW on the 6th 46 SSW on the 14th SUNSHINE: Campbell-Stokes card minutes: 11814 of a possible 23250, or 51% Astronomical total minutes: 12264 of a possible 24131 or 51% ————————————————————– Today’s Observations: 7 A.M. Weather: Broken stratocumulus Temperature: 48F; Dew Point: 38F; Relative Humidity: 68% Wind: NW @ 10G21 kts Sea-level pressure: 1010.5 mb; 29.84 in. Hg: rising, then more rapidly Visibility: 70 miles 6-hr Max temp: 48F 6-hr Min temp: 43F 24-hr Precip: 0.12 inches 24-hr Snowfall: 0.0 inches Snow Depth: 0 inches BHO SA 1155 E50 BKN 70 105/48/38/3210G21/984/ 8/500 53011 70012 10048 20043 10 A.M. Weather: Broken stratocumulus Temperature: 54F; Dew Point: 36F; Relative Humidity: 49% Wind: NW @ 11G18 kts Sea-level pressure: 1010.6 mb; 29.84 in. Hg: rising, then falling Visibility: 70 miles 3-hr Precip: 0.00 inches 3-hr Snowfall: 0.0 inches BHO SA 1455 E50 BKN 70 106/54/36/3011G18/984/ 8/500 50001 1 P.M. Weather: Scattered stratocumulus Temperature: 60F; Dew Point: 36F; Relative Humidity: 41% Wind: WNW @ 10G18 kts Sea-level pressure: 1010.3 mb; 29.83 in. Hg: falling, then more slowly Visibility: 80 miles 6-hr Max temp: 61F 6-hr Min temp: 48F 6-hr Precip: 0.00 inches 6-hr Snowfall: 0.0 inches Snow Depth: 0 inches BHO SA 1755 50 SCT 80 103/60/36/2910G18/983/ 8/500 56003 10061 20048 ————————————————————– SUMMARY FOR THURSDAY, APRIL 30, 2026 TEMPERATURE (DEGREES F) MAX…….52   NORMAL…..63 MIN…….43   NORMAL…..43 MEAN……48   NORMAL…..53 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….-5 TOTAL DEPARTURE FOR THE MONTH………………………+23 [+0.6 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026) TOTAL HEATING UNITS FOR YESTERDAY…………….17  DEPARTURE……..+5 TOTAL HEATING UNITS FOR THE MONTH (MAR)………518  DEPARTURE…….-22 TOTAL HEATING UNITS FOR THE SEASON………….5836  DEPARTURE…….-51 TOTAL HEATING UNITS LAST SEASON TO DATE……..5398  DEPARTURE……+438 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)………..18 ENE  @   10:14 P.M. VECTOR #1 (1-Sec)……….18 ENE  @   10:14 P.M. VECTOR #2 (1-Sec)……….18 NE   @   10:35 P.M. DAVIS #1………………..M DAVIS #2 ……………….M RMY #1 (Instantaneous)…..18 ENE  @   10:14 P.M. RMY #2 (Instantaneous)…..18 NE   @   10:35 P.M. MERLIN………………….M RICHARDS (C5C) (Inst)……17 WNW  @   10:14 P.M. FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL………………14 WNW  @   10:15 P.M. MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 NW   @   10:15 P.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 WNW  @   10:15 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…………….M MAXIMUM 2-MINUTE DAVIS #2 AVERAGE…………….M MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..15 WNW  @   10:15 P.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 NW   @   10:15 P.M. MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………15 WNW  @   10:15 P.M. AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL………2.8 W [67 total miles] VECTOR #1……………….5.0 VECTOR #2……………….5.1 DAVIS #1………………….M DAVIS #2………………….M RMY #1………………….4.9 WNW RMY #2………………….4.9 NW RICHARDS (C5C)…………..5.4 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.12 DEPARTURE…..-0.02 TOTAL PRECIPITATION FOR THE MONTH (APR)……..2.00 DEPARTURE…..-2.76 TOTAL PRECIPITATION FOR THE YEAR (2026)…….13.67 DEPARTURE…..-5.11 SNOWFALL (INCHES) THROUGH THIS MORNING (EST): TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……0.0 TOTAL SNOWFALL FOR THE MONTH (APR)…………TRACE DEPARTURE…..-2.8 TOTAL SNOWFALL FOR THE SEASON (2025-2026)……81.6 DEPARTURE….+11.9 ————————————————————– PRELIMINARY CLIMATE SUMMARY FOR APRIL 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 4/1  73/38/56/+15/0.16/0.0/061/08        35 NE  VEC1 34 ENE RMY 35 4/2  38/34/36/-5/0.45/0.0/000/00         31 E   VEC1 31 E   RMY 33 4/3  67/35/51/+9/0.04/0.0/270/35         31 SW  VEC1 31 SW  RMY 35 4/4  58/35/47/+5/0.01/0.0/093/12         39 ENE VEC1 38 ENE RMY 42 4/5  55/36/46/+3/0.16/0.0/008/01         35 NW  VEC1 36 NW  RMY 38 4/6  50/32/41/-2/0.00/0.0/708/91         46 WNW VEC1 46 WNW RMY 47 4/7  50/29/40/-4/0.10/T/336/43           39 WNW VEC1 39 WNW RMY 41 4/8  43/25/34/-10/0.00/0.0/753/96        30 NNW VEC1 31 NNW RMY 32 4/9  56/30/43/-1/0.00/0.0/755/96         35 S   VEC1 35 SSW RMY 35 4/10 67/33/50/+5/0.00/0.0/672/85         37 S   VEC1 36 SSW RMY 37 4/11 60/41/51/+6/0.00/0.0/690/87         37 NW  VEC1 37 NW  RMY 37 4/12 54/35/45/-1/0.02/0.0/549/69         28 S   VEC1 28 S   RMY 28 4/13 69/41/55/+9/T/0.0/168/21            40 SSW VEC1 41 SSW RMY 42 4/14 83/58/71/+24/0.15/0.0/617/77        46 SSW VEC1 46 SSW RMY 47 4/15 77/44/61/+14/T/0.0/626/78           25 NE  VEC1 25 NE  RMY 24 4/16 69/45/57/+10/0.37/0.0/347/43        45 NW  VEC1 44 NW  RMY 50 TSTM 4/17 62/47/55/+7/0.14/0.0/145/18         31 NE  VEC1 32 NNW RMY 31 4/18 48/41/45/-3/0.04/0.0/008/01         28 ENE VEC1 26 E   RMY 27 4/19 49/34/42/-7/0.14/T/000/00           40 NW  VEC1 39 NW  RMY 42 TSTM 4/20 50/31/41/-8/T/T/596/73              31 W   VEC1 30 W   RMY 32 4/21 50/31/41/-9/0.00/0.0/812/99         28 S   VEC1 29 S   RMY 28 4/22 44/34/39/-11/T/0.0/000/00           31 SSW VEC1 31 SSW RMY 32 4/23 65/40/53/+3/0.00/0.0/784/95         43 NW  VEC1 43 NW  RMY 49 4/24 56/35/46/-5/0.00/0.0/810/98         23 NNW VEC1 24 NNW RMY 23 4/25 51/36/44/-7/0.00/0.0/407/49         18 NE  VEC1 18 NE  RMY 19 4/26 57/41/49/-3/0.00/0.0/283/34         16 ENE VEC1 16 ENE RMY 16 4/27 63/44/54/+2/0.00/0.0/835/100        23 ENE VEC1 23 ENE RMY 23 4/28 56/41/49/-3/0.00/0.0/746/89         24 E   VEC1 25 E   RMY 24 4/29 53/42/48/-5/0.02/0.0/185/22         23 ENE VEC1 23 ENE RMY 24 4/30 52/43/48/-5/0.19/0.0/000/00         18 WNW VEC1 18 WNW RMY 18 5/1 The low since midnight is 43F, the daily normal low is 44F. ————————————————————– APRIL DAILY RECORDS TO DATE NONE. ————————————————————– DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR MAY 1 HIGH 87F IN 1899 LOW 29F IN 1978 PRECIP 2.53 INCHES IN 1921 SNOWFALL TRACE IN 1905,1917,1921,1995,2016 PEAK GUST 57 MPH NW IN 1974 RECORDS FOR MAY 2 HIGH 92F IN 2001 LOW 29F IN 1903 PRECIP 1.36 INCHES IN 2006 SNOWFALL TRACE IN 1920, 1941 PEAK GUST 58 MPH S IN 1983 TODAY’S REPORT PREPARED BY: Amanda Joly
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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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