Weather Guide for Astronomers in the Mercer County
(Princeton and Trenton), New Jersey USA, Region
Weather forecasts, images and information
for skywatchers in central New Jersey and the Delaware Valley
A public service of Princeton Online and EYE ON THE SKY® News Service
sponsored by AstroCruises astronomy cruises.
Current conditions and seven-day forecast from Weather Underground.
Attilla Danko's Clear Sky Clock.
This current longwave infrared image from NOAA's GOES-12 weather satellite is relayed by Research Applications Program of the National Center for Atmospheric Research . NOAA updates these images every 30 minutes, and the date and UTC time (EST + 5 hours or EDT + 4 hours) of image are printed in the upper left corner. If you're seeing an outdated cached image, use your browser's REFRESH button.
Contents of This Page:
- NOAA GOES-12 satellite images (longwave infrared light, visible light and total atmospheric precipitable water vapor), updated every 30 minutes; this page includes thumbnails of these images with links to larger GIF and JPG files.
- NOAA GOES-12 latest weather satellite image in longwave infrared light
- NOAA GOES-12 latest weather satellite image in visible light
- NOAA GOES-12 latest weather satellite image of total atmospheric precipitable water vapor
- Weather Underground version of local (1 km) satellite
- WCAU-TV (Channel 10 in Philadelphia) Doppler radar. WCAU describes its radar as "one of the most powerful live television radars in the world, and Doppler 10,000 is the first real-time radar owned by a television station in the Tri-State (Pennsylvania/Delaware/New Jersey) area."
- WNBC-TV (Channel 4 in New York) Doppler 4,000.
Intellicast (Weather Services International)
NOAA (U. S. National Oceanic and Atmospheric Administration) Climatic Data for Trenton
"Daily Minimum Temperature" based on 1941-1970 data and "Cloudiness" based on 1941-1980 data from NOAA's Comparative Climatic Data for the United States through 1980.
| Month | Daily Min. Temp. °F | Clear Days | Partly Cloudy Days | Cloudy Days |
|---|
| January | 25° | 8 | 8 | 15 |
|---|
| February | 26° | 8 | 8 | 12 |
|---|
| March | 33° | 8 | 9 | 14 |
|---|
| April | 43° | 8 | 9 | 13 |
|---|
| May | 52° | 7 | 11 | 13 |
|---|
| June | 62° | 7 | 11 | 12 |
|---|
| July | 67° | 8 | 12 | 11 |
|---|
| August | 65° | 8 | 12 | 11 |
|---|
| September | 58° | 10 | 9 | 11 |
|---|
| October | 48° | 12 | 8 | 11 |
|---|
| November | 39° | 8 | 9 | 13 |
|---|
| December | 28° | 8 | 9 | 14 |
|---|
| Annual | 46° | 100 (27%) | 115 (32%) | 150 (41%) |
|---|
USA Today also has a page with Trenton data from the National Climate Center
NWS Official Sky Condition Definitions in Zone and Local Forecasts
These are the NOAA National Weather Service (NWS) official definitions of terms used to define the expected predominant or average sky condition in Zone and Local Forecasts (from the Weather Service Operations Manual):
- CLEAR
- 0/10 to 1/10 opaque clouds
- MOSTLY CLEAR
- A few clouds and 1/10 to 3/10 opaque clouds
- PARTLY CLOUDY
- 3/10 to 6/10 opaque clouds
- MOSTLY CLOUDY or CONSIDERABLE CLOUDINESS
- 7/10 to 8/10 opaque clouds
- CLOUDY
- 9/10 to 10/10 opaque clouds
- FAIR
- Less than 4/10 opaque clouds, no precipitation, and no extreme conditions of visibility, wind or temperature (generally pleasant weather conditions).
NWS Official Sky Condition Definitions in Aviation Forecasts
These are the NOAA National Weather Service official definitions of terms used to define the expected predominant or average sky condition in Aviation Forecasts (from the Federal Meteorological Handbook No. 1):
- SKC or CLR (Clear)
- 0/8 of the celestial dome hidden by clouds and/or obscurations.
- FEW (Few)
- 1/8 to 2/8 of the celestial dome hidden by clouds and/or obscurations.
- SCT (Scattered)
- 3/8 to 4/8 of the celestial dome hidden by clouds and/or obscurations.
- BKN (Broken)
- 5/8 to 7/8 of the celestial dome hidden by clouds and/or obscurations.
- OVC (Overcast)
- 8/8 of the celestial dome hidden by clouds and/or obscurations.
Go to |
AstroCruisers Astronomy Club |
Peyton Hall Observatory |
Local Astronomy Links |
Back to Top |
Our thanks to Dr. David Robinson, N. J. State Climatologist, for his assistance with this page.
The address of this page is http://www.eyeonthesky.com/ttnwx.html
Copyright 1998-2003 Eye on the Sky News Service. All rights reserved.
Last Updated 17 June 2003.
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