Mt Hamilton Weather
LO FriendsDavisCopDavis120VaisaAPFDavis40DavisCroAverage
Temp Out53.653.751.6252.55553.28 F
Dew Temp25.632.730.9233.333.331.16 F
Humidity344545484443.2 %
Wind Speed15199.2131414.0 mph
Wind Dir335353351.0360309Az=342
Pressure25.8625.8925.9225.8526.17+0.37 inHg
Precip 00 0 No Precip
Time PST21:06:4021:06:3821:06:4021:06:4021:06:4021:06:40
KAIT inch Rain & Dew 02-01-2026 21:06:40 No Rain rainint= 1% outdew= 1% indew= 0%
120 inch Rain & Dew 02-01-2026 21:06:41 No Rain rainint= 0% outdew= 1% indew= 0%
40 inch Rain & Dew 02-01-2026 21:06:40 No Rain rainint= 1% outdew= 0% indew= 0%
Crossley Rain & Dew 02-01-2026 21:06:40 No Rain rainint= 0% outdew= 0% indew= 0%
Particles um0.30.50.71.02.03.05.010.0Time
Out per 0.24 liter20543581971354642021:00:12
In per 0.24 liter1238219 21:04:49

Estimated combined 0.3+0.5um particles weight as of 02-01-2026 21:00:12 is 9 ug/m3
Estimated PM2.5 Air Quality Index is 149 Unhealthy for Sensitive Groups , TSP is 216 Above Secondary Standard

120 Dome Floor Air Particles 02-01-2026 21:04:49 0.3 um=1238 0.5 um=219
Outside Air Particles by APF02-01-2026_21:00:12_0.3um=2954_0.5um=515_0.7um=284_1.0um=195_2.0um=67_3.0um=6_5.0um=3_10.0um=0_sc=15477757_fl=0.9_st=23_er=0_RH=46%_T=49.64F

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 4772 feet above MH & estimated cloud temp is 6 F