91023 ZIP Code
English Español
ZIP code 91023 covers Mount Wilson, California. It has no Census ZIP Code Tabulation Area, which is how the Census Bureau treats ZIP codes that are not residential neighbourhoods — PO box-only ranges, military addresses, and codes assigned to a single large organisation. There are no population or income figures for it because nobody is counted as living there.
- Time zone
- Pacific UTC-08:00observes daylight saving time
Where 91023 is
Mount Wilson, California — the point the Postal Service gives for this ZIP code. A ZIP code is a set of delivery routes rather than an area, so this marks its centre, not its boundary.
Climate
NOAA US Climate Normals 1991-2020, from the nearest weather station with a full year of records. The station and its distance are named above, because a station forty kilometres away describes somewhere else.
| Weather station | MT WILSON CBS, CA US0.7 km away |
|---|---|
| Rain in a year | 32 in |
Average high and low by month
| January | 56.2°F / 38.1°F7.73 in rain |
|---|---|
| February | 54.8°F / 36.6°F8.26 in rain |
| March | 59.2°F / 38.8°F5.11 in rain |
| April | 63.1°F / 41.7°F2.05 in rain |
| May | 69.6°F / 48.2°F1.05 in rain |
| June | 78.5°F / 57.5°F0.21 in rain |
| July | 84.5°F / 64.2°F0.21 in rain |
| August | 85.1°F / 63.9°F0.01 in rain |
| September | 80.9°F / 59°F0.32 in rain |
| October | 71.6°F / 51.3°F1.31 in rain |
| November | 62.9°F / 43.4°F1.88 in rain |
| December | 54.6°F / 37.4°F4.03 in rain |
Nearby ZIP codes
The closest ZIP codes by centre point, which is not the same as sharing a border.
| 91024 Sierra Madre, CA | 6.9 km away |
|---|---|
| 91003 Altadena, CA | 7.2 km away |
| 91025 Sierra Madre, CA | 7.3 km away |
| 91001 Altadena, CA | 7.8 km away |
| 91104 Pasadena, CA | 8.5 km away |
| 91107 Pasadena, CA | 8.6 km away |
| 91066 Arcadia, CA | 10.1 km away |
| 91077 Arcadia, CA | 10.1 km away |
Location, counties and time zone
County shares from Census 2020 ZCTA relationship files. Time zone from the USDOT National Transportation Atlas, which renders the boundaries written into 49 CFR Part 71.
| Time zone | Pacific (UTC-08:00 standard) |
|---|---|
| Daylight saving time | Observed |
| Latitude, longitude | 34.2264, -118.0662 |
Figures are published for this ZIP code or its Census tabulation area unless a section says otherwise. Estimates whose margin of error made them unreliable are omitted rather than shown. Sources: US Census Bureau, CDC, IRS.