Suggestion:
Plot.plot({
fy: { axis: null },
marks: [
Plot.dot(weather, {
x: "date",
y: "precipitation",
fy: "weather",
stroke: "weather"
}),
Plot.text(
weather,
Plot.selectFirst({
fy: "weather",
text: "weather",
frameAnchor: "top-right"
})
)
]
})
then use dx and dy to give more breathing room