Regarding the weather, I hate it but I won't try to convince you you will also. Maybe you'll like it, or just not care. I don't know nor do I care.
When you say I won't be welcome... Do you mean "racially abused in the street" not welcome, or "the Visa office won't like you" or just "won't get invited to any parties or BBQs"?
A little bit of all of it, the sentiment getting progressively larger for each of your examples. Some people post anecdotes about getting racially abused in the streets. I've personally never had it happen, but I don't doubt those that say it has happened to them.
The Government ('Visa office' in yor example) is progressively reducing benefits/taking away perks for the various classes of foreigners. I've only been here three years, but I've seen:
On Foreigners / non-PR:
-My EP tier (PEP) become 4x hard to qualify for by salary and lose 40% of its validity. The P1s and P2s have lost benefits related to dependents. The lower tier ones have been changed so many times (benefits related to dependents lost, requirements toughened) that I can't keep track.
-Rental restrictions on renting HDB to foreigners have been tightened. The Max lease before the landlord must renew permission from the government has been shortened to 18 months. Each individual building now has a 'quota' on the number of foreigners allowed to rent in it. Note that SGren don't really rent, especially HDB, thus it's a huge artificial constraint on rental supply for foreigners.
-ABSD (stamp duty) on property
purchases by foreigners has skyrocketed unless you're one of a very few nationalities (British isn't one of them). Plenty of posts on this.
- Just getting one is getting progressively more difficult. As alluded too, very well qualified foreigners developing countries who have time invested and a legitimate desire to stay are being turned down unless they have certain non-published but obvious racial characteristics. (British caucasian isn't one of them) Even well qualified from what you'd assume are 'desirable' countries are getting turned down. Basically the local ethnic majority wants more like itself.
- Even if you get PR, can't buy used subsidized housing anymore for the first three years. Due to the dual-market (more on this later) that adds a significant cost to living. True, some foreigners abused this, but not all. It's mostly to please ignorant angry voters.
- IF you are a PR and get your subsidized used housing, you can't ever sublet it, even if you're posted overseas for work.
- Additional (but not as large as foreigners above) ABSD on private property purchases
I'm sure theres dozens of other things I'm missing, but this is just off the top of my head in the past 2-3 years.
For the last part on BBQs and parties, yes, in most cases only expect to get invited to the parties of fellow foreigners, or *occasionally* overseas educated locals. If you get invited by a "local", expect to often find out you're wrong and that person isn't actually local, but a PR (or recent new citizen) themselves. Let embarrassment ensue (yes this has happened to me more than a few times