效果图：

主要步骤：

1. 数据准备：随机数组

2. 图像绘制：绘制间断的时间序列

详细代码：着急的直接拖到最后有完整代码

步骤一：导入库包及图片存储路径并设置中文字体为宋体，西文为新罗马（没有的库包要先下好奥）

###############################################################################
# 导入库包并设置字体
import numpy as np
import matplotlib.pyplot as plt# 设置西文字体为新罗马字体，中文为宋体，字号为12
from matplotlib import rcParams
config = {"font.family": 'serif',"font.size": 12,"mathtext.fontset": 'stix',"font.serif": ['SimSun'],}
rcParams.update(config)
rcParams['axes.unicode_minus']=False
datapath = r'H:/00.csdn/01data/'
figpath = r'H:/00.csdn/02fig/'
shppath = r'H:/00.csdn/04shp/cn_shp/Province_9/Province_9.shp'

步骤二：随便生成数组，注意：x比y的个数少（月数-1）个，原因是有（n-1）个衔接（虚线那里）

###############################################################################
nday1 = 31
nday2 = 30
nday3 = 31
nday4 = 31
# 读入自己的数据
x = range(0, nday1 + nday2 + nday3 + nday4 - 3, 1)
y11 = np.random.randint(-10, 5, (nday1))
y12 = y11 - 0.5
y21 = np.random.randint(10, 15, (nday2))
y22 = y21 + 0.5
y31 = np.random.randint(20, 30, (nday3))
y32 = y31 + 0.5
y41 = np.random.randint(15, 25, (nday4))
y42 = y41 - 0.5

步骤三：绘制图像，主要是控制起始点x位置及x与y的个数匹配，并计算对应个点的真实日期

###############################################################################
# 画图
fig = plt.figure(figsize=(15, 8))
ax = fig.add_axes([0.1, 0.6, 0.6, 0.4])ax.plot(x[0:nday1], y11, 'k-', label='OBS')
ax.plot(x[0:nday1], y12, 'k--', label='WRF')
ax.plot(x[nday1-1:nday1+nday2-1], y21, 'k-',)
ax.plot(x[nday1-1:nday1+nday2-1], y22, 'k--',)
ax.plot(x[nday1+nday2-2:nday1+nday2+nday3-2], y31, 'k-',)
ax.plot(x[nday1+nday2-2:nday1+nday2+nday3-2], y32, 'k--',)
ax.plot(x[nday1+nday2+nday3-3:], y41, 'k-',)
ax.plot(x[nday1+nday2+nday3-3:], y42, 'k--',)ax.set(xlim=(0, 118), xticks=[0, 4, 9, 14, 19, 24, 30, 34, 39, 44, 49, 54, 59, 64, 69, 74, 79, 84, 89, 94, 99, 104, 109, 114, 118], xticklabels=[1, 5, 10, 15, 20, 25, 1, 5, 10, 15, 20, 25, 1, 5, 10, 15, 20, 25, 1, 5, 10, 15, 20, 25, 30],ylim=(-11, 31), yticks=range(-10, 31, 5),yticklabels=range(-10, 31, 5),ylabel='Temperature(℃)',)
ax.text(x=0.01, y=1.03, s='T2m_2016_weining(OBS/CTL)', transform=ax.transAxes, fontsize=12)
ax.text(x=0.45, y=-0.21, s='Time(mm/dd)', transform=ax.transAxes, fontsize=12)
ax.text(x=0.00, y=-0.13, s='Jan/', transform=ax.transAxes, fontsize=12)
ax.text(x=0.26, y=-0.13, s='Apr/', transform=ax.transAxes, fontsize=12)
ax.text(x=0.5, y=-0.13, s='Jun/', transform=ax.transAxes, fontsize=12)
ax.text(x=0.76, y=-0.13, s='Oct/', transform=ax.transAxes, fontsize=12)plt.axvline(x=30, color='k', linestyle='--')
plt.axvline(x=59, color='k', linestyle='--')
plt.axvline(x=89, color='k', linestyle='--')ax.legend(frameon=False, fontsize=12)

步骤四：保存图像

###############################################################################
# 存图
plt.savefig(figpath+'214 断裂时间序列', dpi=600, bbox_inches = 'tight')
plt.show()

完整代码在这里：

###############################################################################
# 导入库包并设置字体
import numpy as np
import matplotlib.pyplot as plt# 设置西文字体为新罗马字体，中文为宋体，字号为12
from matplotlib import rcParams
config = {"font.family": 'serif',"font.size": 12,"mathtext.fontset": 'stix',"font.serif": ['SimSun'],}
rcParams.update(config)
rcParams['axes.unicode_minus']=False
datapath = r'H:/00.csdn/01data/'
figpath = r'H:/00.csdn/02fig/'
shppath = r'H:/00.csdn/04shp/cn_shp/Province_9/Province_9.shp'
###############################################################################
nday1 = 31
nday2 = 30
nday3 = 31
nday4 = 31
# 读入自己的数据
x = range(0, nday1 + nday2 + nday3 + nday4 - 3, 1)
y11 = np.random.randint(-10, 5, (nday1))
y12 = y11 - 0.5
y21 = np.random.randint(10, 15, (nday2))
y22 = y21 + 0.5
y31 = np.random.randint(20, 30, (nday3))
y32 = y31 + 0.5
y41 = np.random.randint(15, 25, (nday4))
y42 = y41 - 0.5
###############################################################################
# 画图
fig = plt.figure(figsize=(15, 8))
ax = fig.add_axes([0.1, 0.6, 0.6, 0.4])ax.plot(x[0:nday1], y11, 'k-', label='OBS')
ax.plot(x[0:nday1], y12, 'k--', label='WRF')
ax.plot(x[nday1-1:nday1+nday2-1], y21, 'k-',)
ax.plot(x[nday1-1:nday1+nday2-1], y22, 'k--',)
ax.plot(x[nday1+nday2-2:nday1+nday2+nday3-2], y31, 'k-',)
ax.plot(x[nday1+nday2-2:nday1+nday2+nday3-2], y32, 'k--',)
ax.plot(x[nday1+nday2+nday3-3:], y41, 'k-',)
ax.plot(x[nday1+nday2+nday3-3:], y42, 'k--',)ax.set(xlim=(0, 118), xticks=[0, 4, 9, 14, 19, 24, 30, 34, 39, 44, 49, 54, 59, 64, 69, 74, 79, 84, 89, 94, 99, 104, 109, 114, 118], xticklabels=[1, 5, 10, 15, 20, 25, 1, 5, 10, 15, 20, 25, 1, 5, 10, 15, 20, 25, 1, 5, 10, 15, 20, 25, 30],ylim=(-11, 31), yticks=range(-10, 31, 5),yticklabels=range(-10, 31, 5),ylabel='Temperature(℃)',)
ax.text(x=0.01, y=1.03, s='T2m_2016_weining(OBS/CTL)', transform=ax.transAxes, fontsize=12)
ax.text(x=0.45, y=-0.21, s='Time(mm/dd)', transform=ax.transAxes, fontsize=12)
ax.text(x=0.00, y=-0.13, s='Jan/', transform=ax.transAxes, fontsize=12)
ax.text(x=0.26, y=-0.13, s='Apr/', transform=ax.transAxes, fontsize=12)
ax.text(x=0.5, y=-0.13, s='Jun/', transform=ax.transAxes, fontsize=12)
ax.text(x=0.76, y=-0.13, s='Oct/', transform=ax.transAxes, fontsize=12)plt.axvline(x=30, color='k', linestyle='--')
plt.axvline(x=59, color='k', linestyle='--')
plt.axvline(x=89, color='k', linestyle='--')ax.legend(frameon=False, fontsize=12)
###############################################################################
# 存图
plt.savefig(figpath+'214 断裂时间序列', dpi=600, bbox_inches = 'tight')
plt.show()