<p>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 <a href="https://en.wikipedia.org/wiki/Intertropical_Convergence_Zone" rel="nofollow noreferrer">Intertropical Convergence Zone (ITCZ)</a>, which is basically a band of clouds and heavy rain that encircles the Earth.</p>

<p>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.</p>

<p>The following is a figure showing the maximum northward and southward locations of the ITCZ during the year (taken from <a href="https://en.wikipedia.org/wiki/Intertropical_Convergence_Zone#/media/File:ITCZ_january-july.png" rel="nofollow noreferrer">here</a> but I added the equatorial line in red).</p>

<p><a href="https://i.sstatic.net/ftTKs.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/ftTKs.png" alt="enter image description here"></a></p>

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

<p>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 <a href="https://climexp.knmi.nl/selectfield_rea.cgi?id=d17099be003bf17970040ea12c50ad61" rel="nofollow noreferrer">KNMI Climate Explorer</a>.</p>

<p>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:</p>

<p><a href="https://i.sstatic.net/mKHdq.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/mKHdq.png" alt="enter image description here"></a></p>

<p>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.</p>

<p>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:</p>

<p><a href="https://i.sstatic.net/eqJkd.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/eqJkd.png" alt="enter image description here"></a></p>

<p>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.</p>

<p><a href="http://www.climatemps.com/" rel="nofollow noreferrer">climatemps.com</a> 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:</p>

<p><a href="https://i.sstatic.net/dsHZt.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/dsHZt.png" alt="enter image description here"></a></p>

<p>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:</p>

<p><a href="https://i.sstatic.net/M2DIH.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/M2DIH.png" alt="enter image description here"></a></p>

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

CC BY-SA 4.0
2019-01-18T21:16:23.263Z
2019-01-20T12:57:15.630Z
2019-01-20T12:57:15.630Z
Camilo Rada
<p>I am looking for locations/places/countries that only have one season.</p>

<p>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.</p>

CC BY-SA 3.0
2014-12-06T05:16:19.673Z
every location on Earth is subject to seasons.  You'd have to go to Venus to avoid them.
f.thorpe
CC BY-SA 3.0
2014-12-06T15:15:53.417Z
Cing didn't specify that the location which they are looking for  were on the Earth, however.
Elberich Schneider
CC BY-SA 3.0
2014-12-07T10:11:45.937Z
How do you define a season?
Peter Jansson
CC BY-SA 3.0
2014-12-07T18:18:50.283Z
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?
Matt Hall
<climate>
Are there locations on Earth that only have one season?
Cing Sian Dal
# Are there locations on Earth that only have one season?

(Asked by: username_0 on 2014-12-06)

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.

**Tags:** climate

> **Comments:**
> **username_1**: every location on Earth is subject to seasons.  You'd have to go to Venus to avoid them.  
> **username_2**: username_0 didn't specify that the location which they are looking for  were on the Earth, however.  
> **username_3**: How do you define a season?  
> **username_4**: 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?  

---

## 1 answers

### Answer by username_5 on 2019-01-18. Score: 4

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)](https://en.wikipedia.org/wiki/Intertropical_Convergence_Zone), 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](https://en.wikipedia.org/wiki/Intertropical_Convergence_Zone#/media/File:ITCZ_january-july.png) but I added the equatorial line in red).

[![enter image description here](https://i.sstatic.net/ftTKs.png)](https://i.sstatic.net/ftTKs.png)

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](https://climexp.knmi.nl/selectfield_rea.cgi?id=d17099be003bf17970040ea12c50ad61).

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](https://i.sstatic.net/mKHdq.png)](https://i.sstatic.net/mKHdq.png)

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](https://i.sstatic.net/eqJkd.png)](https://i.sstatic.net/eqJkd.png)

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](http://www.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](https://i.sstatic.net/dsHZt.png)](https://i.sstatic.net/dsHZt.png)

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](https://i.sstatic.net/M2DIH.png)](https://i.sstatic.net/M2DIH.png)

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


---

