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National Weather Service (NWS) Heat Index Risks:

  • Less than 80 degrees--Comfortable by most standards
  • 80 to 90 degrees--Caution: fatigue with prolonged exposure and activity, use caution
  • 90 to 104 degrees--Extreme Caution: sunstroke, heat cramps, heat exhaustion possible
  • 105 to 129 degrees--Danger: sunstroke, heat cramps, heat exhaustion likely
  • Over 130 degrees--Extreme Danger: will result in heatstroke or sunstroke quickly.

Somerville, NJ and Sacramento, CA examples:
July Average
(F)
Record
Hi
Humid
New Jersey 85° 105° 54%
Sacramento 94° 114° 30%

Other examples:
Where When Temp RH ReelFeel
Somerville 6 AM July 18, '13 72° 97%
Somerville 5 PM July 18, '13 96° 46% 105°
Bridgewater 3 PM July 25, '16 95° 57% 112°
Sacramento 5 PM July 28, '15 106° 12%
Bridgewater 4 PM sept 10, '16 93° 51% 100°
See Friendly Forecast Weather Archive

Others: Nov, Dec 5 Note: Andover, NJ was a better match for Martinsville, than the AccuWeather default for 24 hr hist which was Trenton.

Sacramento High Temp
Record normal 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
June 115 87 98 105 102 101 105 103
July 114 93 107 104 105 99 105 111 107 110 108
Aug 111 91 102 99 105 107 108

Somerville NJ

Sample at my place:
Aug. 2013 upstairs
  AC on: Humidity - 35%; Temp - 75° inside
  Outside Air:  Humidity - 40%; Temp - 72° inside 11PM  65° outside 
                Humidity - 43%; Temp - 66° inside 8:30AM 63° outside
Ten Year New Jersey summary

Humidity July 2011

July 20, July 18 Source: YouTube from NOAA

ReelFeel California vs New Jersey
The ReelFeel® index in Sacramento is similar to that in New Jersey in the afternoon, but the lower temperature and humidity at night in Sacramento result in a 10-15° cooler ReelFeel at other times.
The Heat Index during the day in Sacramento is lower than the actual temperature because it is computed based on a normal (20-40%) humidity and Sacramento humidity is lower.

Somerville New Jersey 24 Hours from 6pm Jun. 9, 2008
Time Temp (° F) RealFeel (° F) Rel. Hum. Wind Dir. Wind Speed Press. (in) Precip. (in) Vis. (Miles) Weather
6am 72 78 90 N 4 29.88 0 3 l/fog
7am 77 91 81 CLM 1 29.9 0 5 haze
8am 84 103 69 CLM 1 29.9 0 5 haze
9am 87 105 64 SSE 4 29.89 0 5 haze
10am 90 112 57 CLM 1 29.88 0 7 sunny
11am 92 105 46 N 5 29.88 0 9 sunny
Noon 92 102 46 S 6 29.87 0 9 m/sunny
1pm 93 106 49 N 5 29.85 0 8 m/sunny
2pm 95 109 42 CLM 1 29.84 0 9 sunny
3pm 94 106 43 CLM 1 29.82 0 8 sunny
4pm 93 102 47
5pm 92 98 51 S 5 29.78 0 7 sunny
6pm 91 93 46 N 4 29.82 0 10 sunny
7pm 84 92 62 CLM 1 29.83 0 9 clear
8pm 81 90 71 CLM 1 29.84 0 9 clear
9pm 77 86 81 CLM 1 29.85 0 7 clear
10pm 75 85 90 CLM 1 29.86 0 6 clear
11pm 75 84 87 CLM 1 29.86 0 5 clear
Mid 73 82 93 CLM 1 29.87 0 4 clear
1am 72 80 93 CLM 1 29.87 0 4 clear
2am 71 78 93 CLM 1 29.88 0 3 l/fog
3am 70 76 93 CLM 1 29.87 0 4 clear
4am 69 74 92 CLM 1 29.86 0 3 l/fog
5am 69 75 92 CLM 1 29.88 0 3 l/fog
Source: AccuWeather


Return to Temp Indexes

last updated 18 July 2011