Did Dumbledore consider the implications of leaving a baby on a doorstep overnight?

Question

Albus Dumbledore famously decided to leave Harry with his Muggle relatives. He left Harry on the doorstep of 4 Privet Drive with a letter rather than giving him to the Dursleys in person, probably to minimise the risk that the Dursleys would say they don't want him.

However, this process involved Harry lying on the doorstep overnight, for several long hours, before being discovered.

Harry Potter rolled over inside the blankets without waking up. One small hand closed on the letter beside him and he slept on, not knowing he was special, not knowing he was famous, not knowing he would be woken in a few hours' time by Mrs Dursley's scream as she opened the front door to put out the milk bottles...
_{(Philosopher's Stone, Chapter 1, The Boy Who Lived).}

Harry was out there as a one year-old baby for the whole damn night. Lily and James died on 31st October (Halloween) so Harry was deposited on the night of 1st November, when weather and overnight temperatures can be inclement, to say the least. It was a night when conditions were known to be poor.

"But I can promise a wet night tonight."
_{(Philosopher's Stone, Chapter 1, The Boy Who Lived).}

Dumbledore dumps the kid on the doorstep with his characteristic thoughtfulness and compassion.

"Good luck, Harry," he murmured. He turned on his heel and with a swish of his cloak he was gone.
_{(Philosopher's Stone, Chapter 1, The Boy Who Lived).}

Good one, Dumbledore.

Did Dumbledore give any consideration to the risk of hypothermia since it was bound to be hours before Harry was discovered? Is there any evidence that magic or something else was used to keep Harry warm?

Related: Why did Dumbledore leave Harry on the Dursleys' doorstep?

Answer 1

We know that Dumbledore is capable of casting a charm that dries (older) Harry's clothes and keeps them warm and dry for a considerable period. Presumably he's perfectly capable of casting that spell and maintaining it on a baby in a basket.

Dumbledore stepped back from the cave wall and pointed his wand at the rock. For a moment, an arched outline appeared there, blazing white as though there was a powerful light behind the crack.

‘You’ve d-done it!’ said Harry through chattering teeth, but before the words had left his lips the outline had gone, leaving the rock as bare and solid as ever. Dumbledore looked round.

‘Harry, I’m so sorry, I forgot,’ he said; he pointed his wand at Harry and at once Harry’s clothes were as warm and dry as if they had been hanging in front of a blazing fire.

_{^{Harry Potter and the Half-Blood Prince: CHAPTER TWENTY-SIX —   The Cave}}

Don't forget,

Dumbledore has big plans for Harry, keeping him alive until he can use him as a human sacrifice in his four-dimensional spat with his former pupil.

so he's hardly likely to allow him to die on a doorstep through mindless neglect

Answer 2

Even if the weather was gruesome, bad weather wouldn't necessarily be a problem for little Harry. In Nordic countries babies are often (intentionally) left outside in the cold; it's seen as good for the baby's constitution (source 1, source 2, source 3).

Even without magical protection against cold, Harry would be fine - he's wrapped in not one, but multiple blankets.

Protection against the rain is more relevant, but could be provided in several ways. The front door could be on the leeward side of the house - we know there's at least one upper floor, as otherwise there couldn't be a cupboard under the stairs. But more likely Harry was sheltered by a porch, which are prevalent in well-off suburbs in England. The location used for Privet Drive in the films definitely has a porch, though I don't remember if one is mentioned in the books.

While no mention is made whether Dumbledore cast a charm or not, it's quite possible that a charm wasn't even needed.

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Note that newborns are more vulnerable. Advice from Svante Norgren, paediatrician and director at the Astrid Lindgren Children’s Hospital in Stockholm:

He also offered advice to parents for babies less than two weeks old, that below zero the babies should not be placed outdoors to sleep:

We have had new-borns admitted to the ER with hypothermia.

As noted by the asker, Harry was already one year old on the night in question, so this shouldn't be an issue in this case - assuming the blankets Harry was swaddled in were appropriate for the season.