First and last freeze/frost dates for Princeton, NJ ,United StatesFirst and last freeze/frost dates for:
Detailed station data* follows:
Flemington 1 Ne, NJ (Hunterdon county):
|Spring 32°||May 15||May 10||May 6||May 3||Apr 30||Apr 27||Apr 24||Apr 20||Apr 15|
|Spring 28°||Apr 30||Apr 25||Apr 21||Apr 18||Apr 15||Apr 12||Apr 9||Apr 5||Mar 31|
|Spring 24°||Apr 12||Apr 8||Apr 5||Apr 2||Mar 31||Mar 28||Mar 26||Mar 23||Mar 18|
|Fall 32°||Sep 30||Oct 4||Oct 8||Oct 10||Oct 13||Oct 15||Oct 18||Oct 21||Oct 26|
|Fall 28°||Oct 11||Oct 17||Oct 21||Oct 24||Oct 27||Oct 30||Nov 2||Nov 6||Nov 11|
|Fall 24°||Oct 24||Oct 30||Nov 2||Nov 5||Nov 8||Nov 11||Nov 15||Nov 18||Nov 24|
Lambertville, NJ (Hunterdon county):
|Spring 32°||May 8||May 4||May 1||Apr 29||Apr 26||Apr 24||Apr 22||Apr 19||Apr 14|
|Spring 28°||Apr 28||Apr 23||Apr 19||Apr 15||Apr 12||Apr 9||Apr 6||Apr 2||Mar 28|
|Spring 24°||Apr 16||Apr 11||Apr 7||Apr 3||Mar 31||Mar 28||Mar 25||Mar 21||Mar 15|
|Fall 32°||Sep 28||Oct 4||Oct 8||Oct 11||Oct 14||Oct 18||Oct 21||Oct 25||Oct 30|
|Fall 28°||Oct 10||Oct 15||Oct 19||Oct 22||Oct 25||Oct 28||Oct 31||Nov 3||Nov 8|
|Fall 24°||Oct 23||Oct 29||Nov 2||Nov 6||Nov 10||Nov 14||Nov 18||Nov 23||Dec 1|
Long Valley, NJ (Morris county):
|Spring 32°||May 20||May 15||May 11||May 8||May 5||May 2||Apr 29||Apr 25||Apr 20|
|Spring 28°||May 1||Apr 27||Apr 24||Apr 21||Apr 19||Apr 16||Apr 13||Apr 10||Apr 6|
|Spring 24°||Apr 18||Apr 14||Apr 10||Apr 7||Apr 5||Apr 2||Mar 30||Mar 27||Mar 22|
|Fall 32°||Sep 22||Sep 27||Oct 1||Oct 4||Oct 7||Oct 10||Oct 13||Oct 16||Oct 21|
|Fall 28°||Oct 5||Oct 10||Oct 14||Oct 17||Oct 20||Oct 24||Oct 27||Oct 31||Nov 4|
|Fall 24°||Oct 19||Oct 25||Oct 29||Oct 31||Nov 4||Nov 7||Nov 10||Nov 14||Nov 20|
* This station data is available courtesy the National Climatic Data Center.
For each weather station, you will see a temperature along with tables of data organized into percentage columns. The percentage column tells you the probability that you will experience that row's temperature on or near that date. Here are two examples to help you determine your probable last frost and first freeze dates.
Example 1 (Last Frost). In the Spring 32° row, if you have "Apr 15" under the 50% column, that means you have a 50% chance of seeing frost on or before April 15th.
Example 2 (First Freeze). In the Fall 24° row, if you have "Dec 1" under the 90% column, that means you have a 90% chance of seeing 24 degrees on or after December 1st.
Empty cells indicate you have a less than 10% chance of ever seeing that temperature.