Mt Hamilton Weather
LO FriendsDavisCopDavis120VaisaAPFDavis40DavisCroAverage
Temp Out56.258.3 58.258.957.9 F
Dew Temp20.625.9 32.531.727.67 F
Humidity2529 383632 %
Wind Speed001.1000.2 mph
Wind Dir196224198.0360224Az=220
Pressure25.7725.79 25.7426.06--25.55 inHg
Precip 0 0 No Precip
Time PST13:16:5513:16:56M5 OUT13:16:5813:16:5013:17:09
KAIT inch Rain & Dew 01-21-2026 13:17:11 No Rain rainint= 1% outdew= 1% indew= 0%
120 inch Rain & Dew 01-21-2026 13:17:11 No Rain rainint= 0% outdew= 1% indew= 0%
40 inch Rain & Dew 01-21-2026 13:16:54 No Rain rainint= 0% outdew= 0% indew= 0%
Crossley Rain & Dew 01-21-2026 13:17:09 No Rain rainint= 0% outdew= 0% indew= 0%
Particles um0.30.50.71.02.03.05.010.0Time
Out per 0.24 liter ------
In per 0.24 liter797119 13:05:16

Estimated combined 0.3+0.5um particles weight as of 01-21-2026 23:52:10 is 5 ug/m3
Estimated PM2.5 Air Quality Index is 19 Good , TSP is 33 Normal

120 Dome Floor Air Particles 01-21-2026 13:05:16 0.3 um=797 0.5 um=119
Outside Air Particles by APF

Out Particle Warning 0.24/L 0.3:21400 0.5:1750 0.7:650 1.0:400 2.0:130 3.0:60 5.0:18 10.0:2
Out Particle Closure 0.24/L 0.3:30600 0.5:2500 0.7:2000 1.0:1200 2.0:400 3.0:180 5.0:60 10.0:3
In Particle Warning 0.24/L 0.3:12000 0.5:980 In Particle Closure 0.24/L 0.3:17000 0.5:1400
Davis40 precip = rain rate * 0.01"/Hr Davis120 precip = 120" teles dew sensor 0=dry 100=wet closure~>15
Avg pressure = deviation 0.01 X in Hg from MH normal - VaisaAPF precip 0=norain 1=rain
If clouds visible overhead: estimated cloud base is at 7363 feet above MH & estimated cloud temp is -15 F