Ages ago, when I was fortunate enough to live in the PNW, I made a post here regarding the conditions for P. Cyanescens growth versus temperature/rain, and created a chart depicting the average start/end of each season versus these variables using data from the "Official PNW active mushroom" threads.
Originally, it was for just one year - however, I later updated it to include previous years that had data, so the chart now has data from 2004 to 2009.
The jagged line obviously represents temperature for that time of the year. The blue dots at the top of each chart per year represent the average rainfall during that point in time - aka blue represents precipitation, else it was dry during that period. The red lines represent the start and end of the Psilocybe Cyanescens season based upon the points in the corresponding year's Official PNW active finds threads, where the active mushrooms began appearing often and where they started to wane. The temperature/precipitation data is based in Seattle, WA - which I chose as a middle ground between southern British Colombia and Oregon.
There are some variables therefore that can be noted. First, because it is based upon a fixed point of weather representing the average weather for an entire region, people may notice their own patches growing at earlier or later times than represented on the chart, or it may have been rainy in some places but not where the weather data is located.
Also, because some people may water their patches, the "season" may have started earlier than naturally for some years, during supposedly dry periods. However, I did attempt to set the start/end date for each season based upon when the threads became most/least active, and not when the first and last posts concerning active mushrooms were.
However, because the weather in the Pacific Northwest generally affects the whole region, I feel that these charts give a pretty accurate depiction of the conditions which start and end the PNW active mushroom season.
Now, I know this thread is about P. Azurescens - however, azures and cyans share many similarities when it comes to fruiting conditions. They generally pop up pretty much about the same time of year.
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What I've noticed from these charts is that the season generally starts when the temperatures start averaging around 55F throughout the day, usually when lows start dipping below 50F. Rain during this period of time also seems to be a catalyst, though as mentioned before some patches may show up sooner if they are heavily watered. The season usually seems to go until the temperature drops below freezing and doesn't come back up for a decent period of time. However, just because the temperature drops below freezing doesn't mean the season abruptly ends - as is the case in 2006 wherein a sharp drop followed by a sharp rise in temperature is noted - the season did not end with that, and indeed lasted all the way until the next drop. On the other hand, looking at data from 2009, the temperatures started dropping more slowly, and thus even though it rose back up to almost 50F after the freeze, the mushroom season did not continue.
Now, comparing that to my own mushroom hunting experiences, I've always said the best time to hunt for actives in the PNW is any time the temperature has dropped below 50F, and it's been rainy/wet/cloudy outside. I've had the best luck during those gray-skied days when the temperature on the bank's clock said 42F. Whenever those conditions arose, various mushroom species would pop up in the empty field next to my house and I would know then to hit up my cyanescens patch, because they were there  .
Some things to consider - the chart data shows that the average temperature needs to be below 55F, however in my experience it needs to be below 50F. Mycelium growing in shaded areas are probably likely to grow sooner because the shade locally dropping the temperature there a few degrees. Also, I don't know whether the cloud cover has anything to do with the mushrooms pinning or not. However, even here in the south I've noticed mushrooms tend to come out when it's cloudy as opposed to sunny - which leads me to believe that INDIRECT light helps to induce pinning of mushrooms in general, and this may be especially true in the PNW where a good portion of the season is covered in gray clouds. Also, it makes sense that the humidity needs to be high before the mushrooms will come out. Rain in itself, as I've also noted in the south, does not cause mushrooms to pop up. However, if the area has been humid for a reasonable period of time, mushrooms are likely to come out. (This usually comes with it being cloudy for a period of time, as well.)
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So, with this information, let's consider this on an indoor scale.
If one wanted to induce pinning of a colder-temperature wood-loving species such as P. Cyanescens or P. Azurescens, they would probably want to start by having the mycelium grow anywhere between 60-70F. Room temperature may be fine for this, but I would not go any higher than 75F for these species. As mycelium grows under the ground, it'd be best for this process to take place in the dark.
Once ready to induce pinning, one would have to increase humidity and drop the temperatures below about 50F, which I'd assume would be best to do in a clean refrigerator (wouldn't do it in one you store your food in.) Most refrigerators have adjustable temperature controls so if one desires, they could start the "season" at a temperature relatively close to 50F and drop the temperature as time goes on. However, this probably is not necessary. What would be necessary is the proper controlling of humidity. There are various methods of doing that, however I think the key here would be to make sure that there is always some condensation on the walls of the growing chamber. Also, one should add some light into the whole setup - but as mentioned before, INDIRECT light. I would take into consideration day and night cycles, but don't forget that areas like the PNW have slightly shorter day/night cycles than those closer to the equator.
Things like light, the length of the day/night cycles, and gradual lowering of temperatures may not play that big of a role. However, if I were doing this, I would want to try emulating nature as much as possible. The success rate for indoor cultivation of azurescens/cyanescens seems to be pretty low, and it may just be that the species are more specific to such triggers than species like cubensis - which seem happy to grow pretty much any time :p.
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ryan 
falcon 
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) and LOTS of rain!!! we had 2 frosts a few weeks apart before the fruiting as well. hope this helps.
PS
1 2 all )
Lou
felixhigh