The climate isn't "going crazy," but it really is starting to change its behavior. Warm Octobers in Moscow have become more noticeable in recent years - this isn't just a one-off anomaly, but part of a long-term warming trend that climatologists have been tracking for a while now. A single warm day doesn't mean much, but if these temperature spikes into the plus keep happening year after year - that's a signal that average seasonal temperatures are shifting upward.
What exactly to expect going forward, nobody can say for sure: there could be mild winters or compensatory cold snaps. But overall, the trend toward a warmer climate in central Russia over the past couple of decades is clear.