| 09:55 EST | 
Clear | 8°C / 46°F | -2°C / 28°F | 50% | 1019 mb
(30.09 in) | SSW 11 kph
(SSW 6.9 mph) | - | 10SM |
| | KCEF 041455Z AUTO 25006KT 10SM CLR 08/M02 A3009
RMK AO2 SLP193 T00801015 51033 CHINO RWY05 |
| 08:55 EST |
Clear | 7°C / 45°F | -1°C / 30°F | 57% | 1018 mb
(30.06 in) | SSW 11 kph
(SSW 6.9 mph) | - | 10SM |
| | KCEF 041355Z AUTO 26006KT 10SM CLR 07/M01 A3006
RMK AO2 SLP183 T00721008 CHINO RWY05 |
| 07:55 EST |
Clear | 6°C / 43°F | -1°C / 30°F | 61% | 1017 mb
(30.03 in) | W 15 kph
(W 9.2 mph) | - | 10SM |
| | KCEF 041255Z AUTO 28008KT 10SM CLR 06/M01 A3003
RMK AO2 SLP171 T00611010 CHINO RWY05 |
| 06:55 EST | 
Clear | 5°C / 41°F | -1°C / 30°F | 66% | 1016 mb
(30 in) | NW 6 kph
(NW 3.5 mph) | - | 10SM |
| | KCEF 041155Z AUTO 30003KT 10SM R23/5500VP6000FT CLR 05/M01 A2999
RMK AO2 SLP160 70015 T00461009 10088 20046 52021 CHINO RWY05 |
| 05:55 EST |
Clear | 6°C / 43°F | 0°C / 32°F | 66% | 1015 mb
(29.97 in) | NNW 6 kph
(NNW 3.5 mph) | - | 10SM |
| | KCEF 041055Z AUTO 33003KT 10SM CLR 06/M00 A2997
RMK AO2 SLP153 T00611005 CHINO RWY05 |
| 04:55 EST | 
Partly Cloudy | 6°C / 43°F | 0°C / 32°F | 66% | 1014 mb
(29.94 in) | NW 9 kph
(NW 5.8 mph) | - | 10SM |
| | KCEF 040955Z AUTO 30005KT 10SM FEW042 06/M00 A2995
RMK AO2 SLP145 T00601003 CHINO RWY05 |
| 03:55 EST |
Clear | 6°C / 43°F | 0°C / 32°F | 66% | 1014 mb
(29.94 in) | W 7 kph
(W 4.6 mph) | - | 10SM |
| | KCEF 040855Z AUTO 27004KT 10SM CLR 06/M00 A2993
RMK AO2 SLP138 T00561003 51029 CHINO RWY05 |
| 01:55 EST | 
Mostly Cloudy | 7°C / 45°F | 1°C / 34°F | 66% | 1012 mb
(29.88 in) | W 15 kph
(W 9.2 mph) | - | 10SM |
| | KCEF 040655Z AUTO 28008KT 10SM BKN040 07/01 A2987
RMK AO2 SLP119 T00730010 CHINO RWY05 |
| 00:55 EST | 
Overcast | 9°C / 48°F | 1°C / 34°F | 58% | 1010 mb
(29.83 in) | WNW 22 kph
(WNW 13.8 mph) | - | 10SM |
| | KCEF 040555Z AUTO 29012KT 10SM OVC038 09/01 A2984
RMK AO2 SLP108 T00870011 10146 20081 51024 CHINO RWY05 |
