HELENA AP, Montana, 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 HELENA AP, Montana, 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 HELENA AP, MT
Daylight chart for {A['location']}, Montana, USA

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Explanation, Data Sources, Background and Discussion.

Data for HELENA AP, Montana, USA

NOAA Station Id: MT244055 Latitude: 46°36'20N Longitude: 111°57'49W Elevation: 3828'

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 HELENA AP, MT, use latitude 46°36'20N and longitude 111°57'49W in the form. You'll need to know the time zone of the location.

Climate (Average Weather) Data

Minimum Temperature°F9.915.623.531.239.847.552.350.841.231.220.311.331.22
Maximum Temperature°F30.537.346.856.965.97583.482.57158.441.531.556.73
Heating Degree Days13971093932634384157425628363110181348664.58
Cooling Degree Days00003391221001300023.08
Monthly Precipitationinches0.520.380.630.911.781.821.341.291.050.660.480.460.94

First and Last Frost Dates

First FrostLast Frost
SEP 06SEP 18SEP 29MAY 03MAY 19JUN 04
Explanation of frost dates.

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