Mt Hamilton Weather
LO FriendsDavisCopDavis120VaisaAPFDavis40DavisCroAverage
Temp Out51.75351.0851.553.352.11 F
Dew Temp21.731.529.331.831.229.1 F
Humidity314443474341.6 %
Wind Speed864.3445.3 mph
Wind Dir31212319.05313Az=336
Pressure25.7625.7925.8125.7426.06+0.26 inHg
Precip 00 0 No Precip
Time PST20:44:4620:44:4920:44:4820:44:4520:44:4820:44:48
KAIT inch Rain & Dew 01-21-2026 20:44:46 No Rain rainint= 1% outdew= 1% indew= 0%
120 inch Rain & Dew 01-21-2026 20:44:49 No Rain rainint= 0% outdew= 1% indew= 0%
40 inch Rain & Dew 01-21-2026 20:44:45 No Rain rainint= 1% outdew= 0% indew= 0%
Crossley Rain & Dew 01-21-2026 20:44:48 No Rain rainint= 0% outdew= 0% indew= 0%
Particles um0.30.50.71.02.03.05.010.0Time
Out per 0.24 liter140615261331610020:42:30
In per 0.24 liter1288278 20:37:45

Estimated combined 0.3+0.5um particles weight as of 01-21-2026 20:42:30 is 6 ug/m3
Estimated PM2.5 Air Quality Index is 52 Moderate , TSP is 65 Normal

120 Dome Floor Air Particles 01-21-2026 20:37:45 0.3 um=1288 0.5 um=278
Outside Air Particles by APF01-21-2026_20:42:30_0.3um=2246_0.5um=243_0.7um=98_1.0um=53_2.0um=27_3.0um=3_5.0um=0_10.0um=0_sc=14526462_fl=1.0_st=23_er=0_RH=42%_T=50.9F

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 4886 feet above MH & estimated cloud temp is 4 F