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I am looking for locations/places/countries that only have one season.

By seasons, I mean a large varying change in temperature and precipitation caused by the climate in the region. I am not looking for abnormal weather.

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    $\begingroup$ every location on Earth is subject to seasons. You'd have to go to Venus to avoid them. $\endgroup$ – farrenthorpe Dec 6 '14 at 5:16
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    $\begingroup$ or Mercury... or are you asking for places that the seasonal variation is minimal, like the equatorial tropics? $\endgroup$ – user889 Dec 6 '14 at 5:23
  • $\begingroup$ Cing didn't specify that the location which they are looking for were on the Earth, however. $\endgroup$ – Elberich Schneider Dec 6 '14 at 15:15
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    $\begingroup$ How do you define a season? $\endgroup$ – Peter Jansson Dec 7 '14 at 10:11
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    $\begingroup$ With some slight rewording, I think this Q raises some interesting questions. How do we measure seasonal variance? Where on the earth's surface has the smallest variance? Is 2 the least number of seasons? What about in the oceans? What about the subsurface? $\endgroup$ – kwinkunks Dec 7 '14 at 18:18
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Due to the obliquity of the Earth, no place would truly have a single season, which in this answer is taken as having consistent conditions, particularly in terms of temperature and precipitation.

An environment that would qualify as having minimal seasonality are in the equatorial tropics, which according to the article Climatic seasonality, resource bottlenecks, and abundance of rainforest birds: implications for global climate change (Williams and Middleton, 2008) due to the almost consistent insolation, as shown below:

enter image description here

Image source - the blue line represents the yearly trends across the year for equatorial regions.

Although, according to the article, the temperature remains fairly constant, precipitation can have alternating wet and dry periods, and can affected by other climatic factors (depending on location) such as El Niño, monsoons etc.

However, according to the Köppen climate classification system, the closest environment that would have minimal seasonality is classified as Af, which are warm moist rainforest, located in the areas shown below:

enter image description here

Image source

An example of a location in such an environment is the city of Andagoya, Colombia, South America, (latitude 5N, elevation 65m) which has the following annual temperature and precipitation:

enter image description here

Image source: Climate Classification and Climatic Regions of the World, which describes the classification Af as lying within the influence of the Intertropical Convergence Zone (ITCZ) and experiencing very little variation in temperature and precipitation throughout the year.

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    $\begingroup$ I once heard/read about an island near the coast of Brazil that has a really small variation in temperature between night, day, summer and winter. I can't remember the details though. $\endgroup$ – Gimelist Dec 16 '14 at 20:50
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The region on Earth that display the smallest contrast between seasons is that in the vicinity of the Equator, because of the smaller changes in solar irradiation. Therefore, equatorial areas do not experience cold and warm seasons. Instead, most equatorial areas usually have wet and dry seasons as they shift in and out of the Intertropical Convergence Zone (ITCZ), which is basically a band of clouds and heavy rain that encircles the Earth.

Taking this into account, a good starting point to discovering areas with the least seasonal contrast (i.e. one season) is to find places near the Equator where the ITCZ varies less.

The following is a figure showing the maximum northward and southward locations of the ITCZ during the year (taken from here but I added the equatorial line in red).

enter image description here

By looking at how the ITCZ changes, it looks the place you are seeking for is in northern Brazil.

This is just rough thoerization though. We can go further by looking at the actual data. As there is not a weather station at every location on Earth, our best hope is to use reanalysis data. This is basically data computed using all available weather station data to figure out atmospheric variables all around the world. One of the most reliable reanalyses is ERA-interim covering the period 1979-2018. This data can be accessed and queried at KNMI Climate Explorer.

Using the analysis tools there, I've computed standard deviation of the monthly precipitation over the whole Earth for each of the 40 years cover by the dataset. Then, I've averaged those 40 years to see where the precipitation has the least variation through the year (within that 1979-2018 period). I downloaded the data to better visualize and analyze it and it looks like this:

enter image description here

As was to be expected, the smaller variation happens in the drier places. This is because the total precipitation is small and thus the standard deviation will be small as well. For example, if in a dessert it rains only 10 mm in any month, the maximum possible precipitation variation will be 10 mm, despite still being a big contrast between seasons. But in a tropical forest it might rain 400 mm in the driest month and 420 mm in the wettest, a difference of 20 mm, yet still have a negligible seasonal contrast.

All that is to say that if we care about seasonal variability, it makes more sense if we show the standard deviation above then normalized by the total precipitation, which looks like this:

enter image description here

As we anticipated looking at the changes in the ITCZ, the most apparent equatorial area with minimal contrast between wet and rainy seasons is in northern Brazil/southern Colombia/northeastern Peru. But there are also some lesser areas in northern Congo in Africa and Indonesia in Asia.

climatemps.com have a nice map where you can click stations around the world and see climate stats. If you click stations there that are in the area encircled by the blue blob near northern Brazil in the above figure, you will indeed see several pretty flat temperature and precipitation curves. For instance for Iquitos, Peru:

enter image description here

To better compare with the example of Andagoya, Colombia provided in other answers, here is the same data but with the axis scaled to match the Andagoya figure:

enter image description here

So those areas of equatorial South America and Africa appear to indeed be some of the least varying places through the year on Earth.

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