# ERA5 vs ERA5-Land Temp differences

**URL:** <https://forum.ecmwf.int/t/era5-vs-era5-land-temp-differences/12643>\
**Category:** C3S - Datasets and Usage\
**Tags:** era5, era5-land\
**Created:** [15 April 2025 10:22 UTC](https://forum.ecmwf.int/t/era5-vs-era5-land-temp-differences/12643 "2025-04-15T10:22:53Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Mark\_Elliott1](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/m/c68b51/32.png) [@Mark\_Elliott1](https://forum.ecmwf.int/u/Mark_Elliott1)\
**Post date:** [15 April 2025 10:22 UTC](https://forum.ecmwf.int/t/era5-vs-era5-land-temp-differences/12643/1 "2025-04-15T10:22:53Z")

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Hi,

I’m comparing ERA5 vs ERA5-Land T2m temperatures and finding some (a lot) of significant differences,

In many cases as much as 5 deg K

Is there an explanation for such significant differences, I was expecting some but not to this extent.

e.g., at Lat 47, Lon 1.0 on 2024-12-27 16:00

 ![image](https://forum.ecmwf.int/uploads/default/original/2X/c/c107c8012617b515448e126ee13433f89952f85f.png)

Thanks

Mark

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**Author:** ![Mark\_Elliott1](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/m/c68b51/32.png) [@Mark\_Elliott1](https://forum.ecmwf.int/u/Mark_Elliott1)\
**Post date:** [30 April 2025 07:40 UTC](https://forum.ecmwf.int/t/era5-vs-era5-land-temp-differences/12643/2 "2025-04-30T07:40:29Z")

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Hi again,

I’m being chased by others about this issue, and I have no explanation to give.

How do I go about getting an answer? Do I need to raise a support ticket?

M

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**Author:** ![Phil\_Hayes](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/p/50afbb/32.png) [@Phil\_Hayes](https://forum.ecmwf.int/u/Phil_Hayes)\
**Post date:** [6 May 2025 17:04 UTC](https://forum.ecmwf.int/t/era5-vs-era5-land-temp-differences/12643/3 "2025-05-06T17:04:47Z")

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I found differences of =/- 5 deg Kelvin for points in France some time ago for T2m, I am surprised given both ERA5 and ERA5 Land have a common data source and wondered what might cause this.  
Phil

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**Author:** ![Berkay\_Akyapi](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/b/54ee81/32.png) [@Berkay\_Akyapi](https://forum.ecmwf.int/u/Berkay_Akyapi)\
**Post date:** [27 May 2025 07:35 UTC](https://forum.ecmwf.int/t/era5-vs-era5-land-temp-differences/12643/4 "2025-05-27T07:35:23Z")

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Hi Mark,

I was about to submit a similar question regarding the differences between ERA5 and ERA5-Land 2-meter temperatures. I am also seeing differences over 1°C in country-level daily averages after zonal statistics. Did you receive any response about this issue?

Thanks,  
Berkay

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**Author:** ![Mark\_Elliott1](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/m/c68b51/32.png) [@Mark\_Elliott1](https://forum.ecmwf.int/u/Mark_Elliott1)\
**Post date:** [27 May 2025 08:26 UTC](https://forum.ecmwf.int/t/era5-vs-era5-land-temp-differences/12643/5 "2025-05-27T08:26:35Z")

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Hi Berkay,

No response from ECMWF on the subject.

I’m regularly asked questions about it, but have no answer to give. I’m not sure how to go about getting an answer from ECMWF - a support ticket doesn’t seem right but what else to do?

Mark