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

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Explanation, Data Sources, Background and Discussion.

Data for HARLOWTON, Montana, USA

NOAA Station Id: MT243939 Latitude: 46°25'59N Longitude: 109°49'50W Elevation: 4162'

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 HARLOWTON, MT, use latitude 46°25'59N and longitude 109°49'50W in the form. You'll need to know the time zone of the location.

Climate (Average Weather) Data

Minimum Temperature°F11.61520.728.436.744.448.247.138.33020.313.729.53
Maximum Temperature°F34.640.247.557.366.775.983.483.272.560.643.335.758.41
Heating Degree Days12991047957665413179791023066129961250658.75
Cooling Degree Days00001341051051700021.83
Monthly Precipitationinches0.450.390.731.32.222.711.741.611.150.770.520.491.17

First and Last Frost Dates

First FrostLast Frost
SEP 04SEP 14SEP 24MAY 14MAY 27JUN 10
Explanation of frost dates.

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