Calendar Heatmap
Reading Habit Tracker
Daily reading minutes calendar showing consistency and reading streaks.
Output
Python
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.colors import LinearSegmentedColormap
import matplotlib.patches as mpatches
np.random.seed(654)
# Generate reading minutes
days = 365
reading = np.random.choice([0, 0, 15, 30, 45, 60, 90], size=days, p=[0.2, 0.1, 0.2, 0.2, 0.15, 0.1, 0.05])
read_levels = np.digitize(reading, bins=[0, 1, 15, 30, 45, 60]) - 1
weeks = 53
data = np.zeros((7, weeks))
for i, val in enumerate(read_levels):
week = i // 7
day = i % 7
if week < weeks:
data[day, week] = val
# Warm amber/orange gradient
colors = ['#ffffff', '#fef3c7', '#fcd34d', '#f59e0b', '#d97706', '#92400e']
cmap = LinearSegmentedColormap.from_list('reading', colors, N=256)
fig, ax = plt.subplots(figsize=(16, 4), facecolor='#ffffff')
ax.set_facecolor('#ffffff')
im = ax.imshow(data, cmap=cmap, aspect='auto', vmin=0, vmax=5)
ax.set_yticks(range(7))
ax.set_yticklabels(['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'], fontsize=9, color='#374151')
ax.set_xticks(range(0, 52, 4))
ax.set_xticklabels(['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec', ''],
fontsize=9, color='#374151')
ax.set_title('Daily Reading Time - Book Tracker', fontsize=16, color='#111827', fontweight='bold', pad=15)
for i in range(8):
ax.axhline(y=i-0.5, color='#e5e7eb', linewidth=0.5)
for i in range(weeks+1):
ax.axvline(x=i-0.5, color='#e5e7eb', linewidth=0.5)
ax.tick_params(colors='#374151', length=0)
for spine in ax.spines.values():
spine.set_visible(False)
legend_elements = [mpatches.Patch(facecolor=c, label=l, edgecolor='#d1d5db')
for c, l in zip(colors, ['None', '<15m', '15-30m', '30-45m', '45-60m', '60m+'])]
ax.legend(handles=legend_elements, loc='upper left', bbox_to_anchor=(0, -0.15), ncol=6,
fontsize=8, facecolor='white', edgecolor='#d1d5db', labelcolor='#374151')
read_days = int(np.sum(reading > 0))
total_hours = int(np.sum(reading)) // 60
ax.annotate(f'{read_days} reading days | {total_hours} hours total', xy=(0.98, 1.1), xycoords='axes fraction',
fontsize=10, color='#d97706', ha='right', fontweight='bold')
plt.tight_layout()
plt.subplots_adjust(bottom=0.25)
plt.show()
Library
Matplotlib
Category
Time Series
More Calendar Heatmap examples
☕