Patna, India climate
Cwa Monsoon-influenced humid subtropical
Patna has a seasonal tropical climate (Monsoon-influenced humid subtropical, Köppen Cwa). The hottest month is June with an average daily high near 37°C, while the coldest is January averaging around 9°C at night. Precipitation totals about 1296 mm a year and is strongly seasonal — September alone averages 375 mm while March barely receives 5 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsPatna climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 22 | 27 | 33 | 37 | 38 | 37 | 34 | 33 | 33 | 32 | 29 | 24 |
| Avg temp (°C) | 15 | 20 | 25 | 30 | 32 | 32 | 30 | 30 | 29 | 27 | 22 | 17 |
| Avg low (°C) | 9 | 12 | 17 | 22 | 25 | 27 | 27 | 26 | 26 | 22 | 15 | 10 |
| Precipitation (mm) | 13 | 21 | 5 | 16 | 15 | 196 | 335 | 259 | 375 | 25 | 28 | 9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 22 | 27 | 33 | 37 | 38 | 37 |
| Avg temp (°C) | 15 | 20 | 25 | 30 | 32 | 32 |
| Avg low (°C) | 9 | 12 | 17 | 22 | 25 | 27 |
| Precipitation (mm) | 13 | 21 | 5 | 16 | 15 | 196 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 34 | 33 | 33 | 32 | 29 | 24 |
| Avg temp (°C) | 30 | 30 | 29 | 27 | 22 | 17 |
| Avg low (°C) | 27 | 26 | 26 | 22 | 15 | 10 |
| Precipitation (mm) | 335 | 259 | 375 | 25 | 28 | 9 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 2 | 2 | 2 | 2 | 3 | 7 | 14 | 14 | 10 | 3 | 0.7 | 0.5 |
| Days with high ≥ 32°C (days) | — | 0.7 | 12 | 20 | 21 | 20 | 17 | 17 | 16 | 12 | 1 | 0.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 2 | 2 | 2 | 2 | 3 | 7 |
| Days with high ≥ 32°C (days) | — | 0.7 | 12 | 20 | 21 | 20 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 14 | 14 | 10 | 3 | 0.7 | 0.5 |
| Days with high ≥ 32°C (days) | 17 | 17 | 16 | 12 | 1 | 0.0 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 32 | 26 | 26 | 33 | 44 | 67 | 82 | 79 | 65 | 31 | 17 | 24 |
| Clear days (≤ 30% cloud) | 17 | 19 | 22 | 17 | 11 | 3 | 0.4 | 0.7 | 5 | 19 | 25 | 21 |
| Partly cloudy days (30–70%) | 11 | 6 | 6 | 10 | 14 | 10 | 7 | 8 | 9 | 7 | 3 | 8 |
| Cloudy days (≥ 70%) | 3 | 3 | 3 | 4 | 6 | 16 | 24 | 22 | 16 | 5 | 2 | 2 |
| Relative humidity (%) | 49 | 40 | 29 | 24 | 32 | 49 | 76 | 83 | 85 | 73 | 61 | 54 |
| Wind speed (mph) | 3.6 | 4.0 | 4.7 | 4.9 | 5.4 | 6.3 | 6.0 | 4.9 | 4.4 | 2.7 | 2.7 | 3.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 32 | 26 | 26 | 33 | 44 | 67 |
| Clear days (≤ 30% cloud) | 17 | 19 | 22 | 17 | 11 | 3 |
| Partly cloudy days (30–70%) | 11 | 6 | 6 | 10 | 14 | 10 |
| Cloudy days (≥ 70%) | 3 | 3 | 3 | 4 | 6 | 16 |
| Relative humidity (%) | 49 | 40 | 29 | 24 | 32 | 49 |
| Wind speed (mph) | 3.6 | 4.0 | 4.7 | 4.9 | 5.4 | 6.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 82 | 79 | 65 | 31 | 17 | 24 |
| Clear days (≤ 30% cloud) | 0.4 | 0.7 | 5 | 19 | 25 | 21 |
| Partly cloudy days (30–70%) | 7 | 8 | 9 | 7 | 3 | 8 |
| Cloudy days (≥ 70%) | 24 | 22 | 16 | 5 | 2 | 2 |
| Relative humidity (%) | 76 | 83 | 85 | 73 | 61 | 54 |
| Wind speed (mph) | 6.0 | 4.9 | 4.4 | 2.7 | 2.7 | 3.0 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 23 years of daily observations at Patna, a weather station, about 4 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.