Rain slopes for moth richness at a fixed catch size had intervals that included zero in four UK samples in 1993-2015

We tested rain slopes for expected richness in a draw of ten moths from light-trap catches. Four models used 5,896 nights in England and Scotland in 1993-2003 and 2004-2015. Models controlled trap weeks, temperature, wind, radiation, moon illumination and rain seven days before and after. All four primary rain intervals included zero after four-test correction. Slopes ranged from -0.148 to +0.013 expected taxa per unit of log2(1 + rain/mm). Current-minus-displaced rain intervals also included zero. Later Scotland gave a negative interval with a five-moth measure or added catch control, but these choices changed the measure, selection or target. No common rain response was established. Catch-size selection, missing records, few Scottish sites and shared monitoring methods limit inference. The study tests observation bias in biodiversity measurements. It does not test pollution or a causal climate effect. Code, aggregate results, source hashes, checks and a figure are included. External records stay outside the bundle.