I think for me it was a week in Keswick about 5 years ago. Normally I love the lakes but the entire week was just a continuous cloudburst. We arrived in torrential rain and it continued in much the same vein every day. We trudged into Keswick a couple of times and did some touring round by car but the Lake District is for walking and when it's bucketing down it's not much fun. We still did some walking but got soaked every day. We left a day early in the end - we haven't been back to the lakes since.