I’ve done alot of contracting for the MOD and USAF on bases in the UK.
To put it bluntly, dont use the above methods if high security is needed; all can be bypassed.
Certainly do not opt for face recognition, for finger print recognition. These have major flaws still (google).
MOD have used retina scanning (modified from open source) in conjunction with 12 digit passcode.
I’ll talk about a few limitations of the other two for you specifically.
You mentioned weather proof, now if you chose face recognition problems would be created by wearing a hat/helmet/hood in the rain for example; likewise fingerprints to not take well to rain or dirt.
Average time for retaina from start to access is 10 – 20secs with access code allowing start of retina scan, depending on user database and access right rules etc.