Climate and Average Weather Year Round in Pātan Nepal

In Pātan, the wet season is warm, muggy, and partly cloudy and the dry season is comfortable and mostly clear. Over the course of the year, the temperature typically varies from 37°F to 84°F and is rarely below 33°F or above 89°F.

Based on the tourism score, the best times of year to visit Pātan for warm-weather activities are from early April to early June and from late September to late October.

The warm season lasts for 6.1 months, from April 3 to October 8, with an average daily high temperature above 80°F. The hottest month of the year in Pātan is June, with an average high of 83°F and low of 68°F.

The cool season lasts for 2.1 months, from December 8 to February 11, with an average daily high temperature below 68°F. The coldest month of the year in Pātan is January, with an average low of 38°F and high of 65°F.

In Pātan, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.

The clearer part of the year in Pātan begins around September 19 and lasts for 9.0 months, ending around June 20.

The clearest month of the year in Pātan is November, during which on average the sky is clear, mostly clear, or partly cloudy 91% of the time.

The cloudier part of the year begins around June 20 and lasts for 3.0 months, ending around September 19.

The cloudiest month of the year in Pātan is August, during which on average the sky is overcast or mostly cloudy 80% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Pātan varies very significantly throughout the year.

The wetter season lasts 3.9 months, from May 29 to September 25, with a greater than 32% chance of a given day being a wet day. The month with the most wet days in Pātan is July, with an average of 19.0 days with at least 0.04 inches of precipitation.

The drier season lasts 8.1 months, from September 25 to May 29. The month with the fewest wet days in Pātan is November, with an average of 0.4 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Pātan is July, with an average of 19.0 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 63% on July 17.

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Pātan experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 6.7 months, from April 7 to October 30, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Pātan is July, with an average rainfall of 7.4 inches.

The rainless period of the year lasts for 5.2 months, from October 30 to April 7. The month with the least rain in Pātan is November, with an average rainfall of 0.1 inches.

The length of the day in Pātan varies over the course of the year. In 2024, the shortest day is December 21, with 10 hours, 23 minutes of daylight; the longest day is June 21, with 13 hours, 54 minutes of daylight.

The earliest sunrise is at 5:07 AM on June 10, and the latest sunrise is 1 hour, 48 minutes later at 6:55 AM on January 12. The earliest sunset is at 5:08 PM on December 1, and the latest sunset is 1 hour, 55 minutes later at 7:03 PM on July 1.

Daylight saving time (DST) is not observed in Pātan during 2024.

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

Pātan experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.5 months, from May 25 to October 7, during which time the comfort level is muggy, oppressive, or miserable at least 25% of the time. The month with the most muggy days in Pātan is August, with 30.1 days that are muggy or worse.

The least muggy day of the year is February 14, when muggy conditions are essentially unheard of.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Pātan experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.1 months, from February 15 to July 18, with average wind speeds of more than 5.0 miles per hour. The windiest month of the year in Pātan is April, with an average hourly wind speed of 6.2 miles per hour.

The calmer time of year lasts for 6.9 months, from July 18 to February 15. The calmest month of the year in Pātan is December, with an average hourly wind speed of 3.8 miles per hour.

The predominant average hourly wind direction in Pātan varies throughout the year.

The wind is most often from the west for 4.1 weeks, from March 23 to April 21, with a peak percentage of 36% on March 25. The wind is most often from the south for 5.7 months, from April 21 to October 12, with a peak percentage of 71% on July 11. The wind is most often from the north for 5.4 months, from October 12 to March 23, with a peak percentage of 49% on January 1.

To characterize how pleasant the weather is in Pātan throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best times of year to visit Pātan for general outdoor tourist activities are from early April to early June and from late September to late October, with a peak score in the second week of May.

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Pātan for hot-weather activities is from mid May to late June, with a peak score in the first week of June.

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

While it does not do so every year, freezing temperatures are seen in Pātan over some winters. The day least likely to be in the growing season is January 11, with a 70% chance.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms in Pātan should appear around January 25, only rarely appearing before January 20 or after January 31.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences significant seasonal variation over the course of the year.

The brighter period of the year lasts for 2.6 months, from March 27 to June 13, with an average daily incident shortwave energy per square meter above 6.9 kWh. The brightest month of the year in Pātan is May, with an average of 7.5 kWh.

The darker period of the year lasts for 2.6 months, from November 11 to January 30, with an average daily incident shortwave energy per square meter below 4.8 kWh. The darkest month of the year in Pātan is December, with an average of 4.2 kWh.

For the purposes of this report, the geographical coordinates of Pātan are 27.677 deg latitude, 85.314 deg longitude, and 4,377 ft elevation.

The topography within 2 miles of Pātan contains significant variations in elevation, with a maximum elevation change of 531 feet and an average elevation above sea level of 4,300 feet. Within 10 miles contains significant variations in elevation (6,263 feet). Within 50 miles also contains extreme variations in elevation (23,389 feet).

The area within 2 miles of Pātan is covered by artificial surfaces (54%) and cropland (45%), within 10 miles by cropland (40%) and trees (37%), and within 50 miles by trees (50%) and cropland (31%).