SAINT HELENA, California, USA:
Climate, Global Warming, and Daylight Charts and Data

Scroll down to see the all the data on which the charts are based. Also see Explanation, background, and discussion.
Global Warming/Climate Change for SAINT HELENA, California, USA

One predicted temperature increase is
between 3°C and 5°C (5.4°F and 9.0°F).
See About the Global Warming Data for more information about this prediction.

climate chart for SAINT HELENA, CA
Daylight chart for {A['location']}, California, USA

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Explanation, Data Sources, Background and Discussion.

Data for SAINT HELENA, California, USA

NOAA Station Id: CA047643 Latitude: 38°30'26N Longitude: 122°28'26W Elevation: 225'

Sunrise and Sunset Data

The yellow section shows when the sun is up, and how this changes over the year. Use the time-of-day scales, on the left and right, and the month scale on the top and bottom, to tell approximately when sunrise and sunset occur. See Sunrise, Sunset, and Daylight for more info.

The sunrise and sunset times shown in the chart are approximate. They are accurate for the latitude, and show the precise amount of daylight, but the rise and set times may be offset (up or down in the chart) since I don't have an automated way of matching time zones to longitudes. The charts are made assuming that the location is in the middle of an evenly spaced time zone.

For precise times see US Naval Observatory. For SAINT HELENA, CA, use latitude 38°30'26N and longitude 122°28'26W in the form. You'll need to know the time zone of the location.

Climate (Average Weather) Data

StatisticUnitsJanFebMarAprMayJunJulAugSepOctNovDecAverage
Minimum Temperature°F37.840.341.844.24852.153.953.651.647.241.636.745.73
Maximum Temperature°F5862.566.37379.285.589.388.385.677.765.158.474.08
Heating Degree Days531381343216115215526116352541221.00
Cooling Degree Days0032372134210190134373067.17
Monthly Precipitationinches7.467.15.311.740.680.170.040.080.411.844.835.222.91

First and Last Frost Dates


First FrostLast Frost
10%50%90%10%50%90%
OCT 29NOV 27DEC 27JAN 16MAR 04APR 21
Explanation of frost dates.


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