下面是完整代码:
```python
# Create a figure and an array of axes: 2 rows, 1 column with shared y axis
fig, ax = plt.subplots(2, 1, sharey=True)
# Plot Seattle precipitation data in the top axes
ax[0].plot(seattle_weather["MONTH"], seattle_weather["MLY-PRCP-NORMAL"], color="blue")
ax[0].plot(seattle_weather["MONTH"], seattle_weather["MLY-PRCP-25PCTL"], color="blue", linestyle="--")
ax[0].plot(seattle_weather["MONTH"], seattle_weather["MLY-PRCP-75PCTL"], color="blue", linestyle="--")
ax[0].set_title("Seattle")
# Plot Austin precipitation data in the bottom axes
ax[1].plot(austin_weather["MONTH"], austin_weather["MLY-PRCP-NORMAL"], color="red")
ax[1].plot(austin_weather["MONTH"], austin_weather["MLY-PRCP-25PCTL"], color="red", linestyle="--")
ax[1].plot(austin_weather["MONTH"], austin_weather["MLY-PRCP-75PCTL"], color="red", linestyle="--")
ax[1].set_title("Austin")
# Add x-axis labels and a shared y-axis label
fig.text(0.5, 0.04, "Month", ha="center")
fig.text(0.04, 0.5, "Precipitation (inches)", va="center", rotation="vertical")
plt.show()
```