Mt Hamilton Weather
LO FriendsDavisCopDavis120VaisaAPFDavis40DavisCroAverage
Temp Out38.740.339.239.740.339.64 F
Dew Temp3739.73239.739.437.56 F
Humidity949897.251009797.25 %
Wind Speed7148.7141311.3 mph
Wind Dir293205233.0248211Az=237
Pressure25.5925.6425.6625.5925.99+0.11 inHg
Precip 01 0 Dew/Driz
Time PST13:01:5313:01:5513:01:5613:01:5313:01:5513:01:54
KAIT inch Rain & Dew 04-21-2026 13:01:53 Raining! rainint= 5% outdew= 44% indew= 0%
120 inch Rain & Dew 04-21-2026 13:01:51 Raining! rainint= 0% outdew= 46% indew= 0%
40 inch Rain & Dew 04-21-2026 13:01:53 Raining! rainint= 5% outdew= 59% indew= 0%
Crossley Rain & Dew 04-21-2026 13:01:55 Raining! rainint= 4% outdew= 59% indew= 0%
Particles um0.30.50.71.02.03.05.010.0Time
Out per 0.24 liter73735511531251534581289012211912:54:21
In per 0.24 liter29880 12:32:29

Estimated combined 0.3+0.5um particles weight as of 04-21-2026 12:54:21 is 94 ug/m3
Estimated PM2.5 Air Quality Index is 14888 Hazardous , TSP is 42367 Urgent

120 Dome Floor Air Particles 04-21-2026 12:32:29 0.3 um=298 0.5 um=80
Outside Air Particles by APF04-21-2026_12:54:21_0.3um=7066_0.5um=5282_0.7um=5091_1.0um=4939_2.0um=4391_3.0um=2770_5.0um=1171_10.0um=19_sc=22272992_fl=0.6_st=23_er=0_RH=98%_T=43.88F

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 136 feet above MH & estimated cloud temp is 38 F