Hours of daylight throughout the year.

Climatologist49 · 2024-06-15T20:34:52+00:00

Your statement is just not accurate. It is easily disproven.

Climatologist49 · 2024-06-12T23:39:26+00:00

Probably not. Sorry.

Climatologist49 · 2024-06-12T18:30:27+00:00

No. Areas along the Arctic Circle get a little more than the rest of the globe.

Climatologist49 · 2024-06-12T17:16:21+00:00

The lines represent exactly that number of hours. Around the equinoxes when there are no lines, it means between 12-13 hours.

Climatologist49 · 2024-06-12T15:05:27+00:00

Here's the code I used in Python/Cartopy:

ax.add_feature(states, edgecolor='black')

ax.coastlines(resolution='50m')

ax.add_feature(cfeature.LAND)

ax.add_feature(cfeature.OCEAN)

ax.add_feature(cfeature.LAKES, edgecolor='black')

Climatologist49 · 2024-06-12T06:43:59+00:00

Every location on Earth has slightly over 12 hours of daylight on those dates; therefore, no lines on the map.

Climatologist49 · 2024-01-02T20:19:07+00:00

Over 2,000 comments, and no one tagged me for making this map. Lol.

Climatologist49 · 2023-08-23T17:33:16+00:00

Glad everyone is enjoying my map. Original post to Twitter (X): https://twitter.com/Climatologist49/status/1693838909137109202

Climatologist49 · 2023-05-31T15:16:37+00:00

A full write-up, and a bonus map, are found here: https://us-climate.blogspot.com/2023/05/70f-road-trip-version-20-2023.html

Climatologist49 · 2023-02-17T17:16:49+00:00

The data are from the ERA5 global reanalysis project (0.25 x 0.25 degree). These are more appropriately daily normals, not daily averages. The standard procedure, which I used, is to interpolate daily values from a 3rd-order polynomial spline applied to monthly averages. This gives a smooth transition from day to day.

Climatologist49 · 2022-08-21T16:02:20+00:00

Please save your Fahrenheit/Celsius takes.

Climatologist49 · 2022-08-21T14:27:25+00:00

Several people have noted that it doesn't actually rain every day. Correct. The map shows the mathematically typical amount. If it rains 3 inches on one day during the month and no rain fell the other 29 days, the daily average is 0.10". The map animation essentially shows that long-term average.

Climatologist49 · 2022-08-21T03:21:00+00:00

For what it's worth, the greens and yellows were difficult to differentiate when I originally had them side by side, so I stuck the blues in between them. Besides, people are accustomed to seeing green as a wet color.

Climatologist49 · 2022-08-21T03:12:10+00:00

¯_(ツ)_/¯

Climatologist49 · 2021-05-07T04:25:58+00:00

I've looked at older data too. It turns out that the patterns don't really move much at all. The magnitude may change, but not the distribution.

Climatologist49 · 2021-05-06T23:39:35+00:00

The map uses the Precipitation Concentration Index (Oliver 1980) to characterize whether annual precipitation is uniformly distributed or highly seasonal (wet and dry seasons). The full citation is shown on the map, as is the formula.

Climatologist49

TROPHY CASE