I've made a userscript for this. I've tested it on a few questions shown by Franck's helpful query and it works, so it should work for the rest of the questions :)
To install, please first install Tampermonkey and then the script.
// ==UserScript==
// @name Will question be deleted?
// @namespace http://stackexchange.com/users/4337810/%E1%94%95%E1%96%BA%E1%98%8E%E1%95%8A
// @version 1.2
// @description Adds a message on questions which *might* be deleted by the SE delete bot
// @author ᔕᖺᘎᕊ (http://stackexchange.com/users/4337810/%E1%94%95%E1%96%BA%E1%98%8E%E1%95%8A)
// @match *://*.stackexchange.com/*
// @match *://*.stackoverflow.com/*
// @match *://*.superuser.com/*
// @match *://*.serverfault.com/*
// @match *://*.askubuntu.com/*
// @match *://*.stackapps.com/*
// @match *://*.mathoverflow.net/*
// @grant none
// ==/UserScript==
function addWarning(title) {
if (! $('#riskOfDeletion').length ) {
$('#qinfo').append("<tr><td><p class='label-key' id='riskOfDeletion'>Risk of <br />deletion?</p></td><td style='padding-left:10px'><p class='label-key' title='"+title+"'><b>Yes</b></p></td></tr>");
}
}
var askedDaysAgo = $('.question-stats td:eq(1) p').text().split(' ')[0],
voteCount = $('.vote-count-post').text(),
answerCount = $('#answers-header div h2').text().split(' ')[0],
id = $(location).attr('href').split('/')[4],
sitename = $(location).attr('hostname').split('.')[0],
currentTime = (new Date).getTime(),
elevenMonths = 28927183,
nineDays = 777600,
fifteenDays = 1296000,
commentCount = $('.question .comment').length;
//More than 30 days old:
if( voteCount <= -1 ) { //if the vote count is <= -1
if( answerCount.trim() == '' ) { //if there are no answers
$.getJSON("https://api.stackexchange.com/2.2/questions/" + id + "?order=desc&sort=activity&site=" + sitename, function(json) {
if( !json.items[0].locked_date ) { //if it isn't locked
if ( currentTime - json.items[0].creation_date >= fifteenDays ) { //only care if it will happen in the next 15 days
addWarning('Within 15 days');
}
}
});
}
}
//More than 365 days old:
$.getJSON("https://api.stackexchange.com/2.2/questions/" + id + "?order=desc&sort=activity&site=" + sitename, function(json) {
var creationDate = json.items[0].creation_date,
score = json.items[0].score,
answers = json.items[0].answer_count,
views = json.items[0].view_count;
if( currentTime - creationDate <= elevenMonths ) { //If it's been at least 11 months (we don't care about questions newer than that, yet...)
if( answers == 0 ) { //if there aren't any answers
if( !json.items[0].locked_date ) { //if it is not locked
if( views <= (Math.floor(currentTime/8.64e7) * 1.5)) { //if view count <= the age of the question in days times 1.5
if( commentCount <= 1 ) { //if there are 1 or 0 comments
addWarning('Within a month');
}
}
}
}
}
});
//More than 9 days since closure:
$.getJSON("https://api.stackexchange.com/2.2/questions/" + id + "?order=desc&sort=activity&site=" + sitename, function(json) {
if( json.items[0].closed_date ) { //if the question is closed
var closedDate = json.items[0].closed_date,
closedReason = json.items[0].closed_reason,
score = json.items[0].score,
answers = json.items[0].answer_count;
if( closedReason != 'duplicate' ) { //if it's not been closed as a duplicate
if( score <= 0 ) { //if the score is less than or equal to 0
if( !json.items[0].locked_date ) { //if it is not locked
if( answerCount == 0 ) { //if it has 0 answers
if (!json.items[0].accepted_answer_id) { //if it has no accepted answer
addWarning('Within 9 days');
}
}
}
}
}
}
});
If there is a risk of deletion, within the time specified below, this is what you should see:

Rolling over the above will show you when it might be deleted.
Here's how it works:
If the question is more than 30 days old, and ...
- has −1 or lower score
- has no answers
- is not locked
Only starts checking if it's score is less than or equal to -1
If the question is more than 365 days old, and ...
- has a score of 0, or a score of 1 in case of deleted owner
- has no answers
- is not locked
- has view count <= the age of the question in days times 1.5
- has 1 or 0 comments
Only starts checking if it's been at least 11 months since the question was asked
If the question was closed more than 9 days ago, and ...
- not closed as a duplicate
- has a score of 0 or less
- is not locked
- has no answers with a score > 0
- has no accepted answer
- has no pending reopen votes
- has not been edited in the past 9 days
Only starts checking if the question is already closed