This report describes the historical weather record at the Indira Gandhi International Airport (New Delhi, India) during 2015. This station has records back to March 1975.
New Delhi has a hot semi-arid steppe climate. The area within 25 mi of this station is covered by croplands (87%) and built-up areas (9%)
Daylight saving time (DST) was not observed at New Delhi during 2015.
2015 was not a leap year, so it has 365 days and no February 29th. The first leap year before 2015 was 2012 and the first after is 2016.
The summer and winter solstices and the spring and fall equinoxes mark the passing of the seasons. They fall on nearly the same day each year, with differences of a day or two depending on the year. In 2015 they occurred on:
|Spring Equinox||Friday, 20 March 2015.|
|Summer Solstice||Sunday, 21 June 2015.|
|Fall Equinox||Wednesday, 23 September 2015.|
|Winter Solstice||Tuesday, 22 December 2015.|
The hottest day of 2015 was May 26, with a high temperature of 115°F. For reference, on that day the average high temperature is 104°F and the high temperature exceeds 112°F only one day in ten. The hottest month of 2015 was May with an average daily high temperature of 107°F.
Relative to the average, the hottest day was December 30. The high temperature that day was 76°F, compared to the average of 65°F, a difference of 11°F. In relative terms the warmest month was February, with an average high temperature of 78°F, compared to an typical value of 75°F.
The longest warm spell was from August 23 to September 22, constituting 31 consecutive days with warmer than average high temperatures. The month of February had the largest fraction of warmer than average days with 86% days with higher than average high temperatures.
The coldest day of 2015 was December 25, with a low temperature of 39°F. For reference, on that day the average low temperature is 47°F and the low temperature drops below 42°F only one day in ten. The coldest month of 2015 was January with an average daily low temperature of 47°F.
Relative to the average, the coldest day was June 14. The low temperature that day was 72°F, compared to the average of 83°F, a difference of 12°F. In relative terms the coldest month was April, with an average low temperature of 72°F, compared to an typical value of 74°F.
The longest cold spell was from April 3 to April 20, constituting 18 consecutive days with cooler than average low temperatures. The month of April had the largest fraction of cooler than average days with 83% days with lower than average low temperatures.
The clearest month of 2015 was October, with 90% of days being more clear than cloudy. The longest spell of clear weather was from September 24 to October 27, constituting 34 consecutive days that were clearer than they were cloudy.
The cloudiest month of 2015 was August, with 58% of days being more cloudy than clear. The longest spell of cloudy weather was from August 4 to August 13, constituting 10 consecutive days that were cloudier than they were clear.
This station provides hourly reports of significant weather events at and around the station, but does not report the quantity of precipitation at the station itself. This is common for weather stations located outside of the United States, and for a small subset of stations in the United States that are located at lesser used and smaller airports.
This station reports when significant weather events (including precipitation) are visually observed at or near the station. Such events do not always correspond to measured quantities of liquid equivalent precipitation, such as when the event is near by not at the station, or in the case of solid precipitation that does not melt in the collection basin.
The day in 2015 with the most precipitation observations was March 1. There were 15 hourly weather reports that day (out of a maximum of 24) in which some form of precipitation was observated at or near the station. The month with the most precipitation observations was July, with 61 hourly present weather reports involving some form of precipitation.
As determined by the present weather reports, the longest dry spell was from November 6 to December 31, constituting 56 consecutive days with no observed precipitation. The month of December was completely without observed precipitation.
The month with the largest fraction of days with at least some observed precipitation was July, with 48% of days reporting some observed precipitation.
Either snow is exceptionally rare at this location or this station did not reliably report it during 2015.
Humidity is an important factor in determining how weather conditions feel to a person experiencing them. Hot and humid days feel even hotter than hot and dry days because the high level of water content in humid air discourages the evaporation of sweat from a person's skin.
When reading the graph below, keep in mind that the hottest part of the day tends to be the least humid, so the daily low (brown) traces are more relevant for understanding daytime comfort than the daily high (blue) traces, which typically occur during the night. Applying that observation, the least humid month of 2015 was May with an average daily low humidity of 15%, and the most humid month was January with an average daily low humidity of 60%.
But it is important to keep in mind that humidity does not tell the whole picture and the dew point is often a better measure of how comfortable a person will find a given set of weather conditions. Please see the next section for continued discussion of this point.
Dew point is the temperature below which water vapor will condense into liquid water. It is therefore also related to the rate of evaporation of liquid water. Since the evaporation of sweat is an important cooling mechanism for the human body, the dew point is an important measurement for understanding how dry, comfortable, or humid a given set of weather conditions will feel.
Generally speaking, dew points below 50°F will feel a bit dry to some people, but comfortable to people accustomed to dry conditions; dew points from 50°F to 68°F are fairly comfortable to most people, and dew points above 68°F are increasingly uncomfortable, becoming oppressive around 77°F.
To take some examples, and basing our categorization on the daily high dew point in 2015, January had 4 dry days, 27 comfortable days, and no humid days; April had no dry days, 24 comfortable days, and 6 humid days; July had no dry days, no comfortable days, and 31 humid days; and October had no dry days, 16 comfortable days, and 15 humid days.
The highest sustained wind speed was 23 mph, occurring on May 19; the highest daily mean wind speed was 11 mph (March 1); and the highest wind gust speed was 34 mph (May 19).
The windiest month was June, with an average wind speed of 7 mph. The least windy month was November, with an average wind speed of 3 mph.
Visibility is the maximum distance at which a given reference object or light can be clearly discerned. In the United States, visibilities that are greater than or equal to 10 miles are typically reported as 10 miles.
The day of 2015 with the lowest average visibility was January 8, with an average visibility of 0.2 mi. The month with the lowest average visibility was January, with an average visibility of 0.6 mi. With an average visibility of 2.2 mi, the month of September had the highest average visibility.
The cloud ceiling is the altitude of the lowest layer of clouds that are at categorized as broken (mostly cloudy) or overcast (cloudy). If no such cloud layer exists then the ceiling is unlimited and no value is reported.
The day of 2015 with the lowest average cloud ceiling was December 12, with an average cloud ceiling of 2001'. The month with the lowest average cloud ceiling was December, with an average cloud ceiling of 7334'. The month of November has the highest average cloud ceiling, with an average cloud ceiling of 10000'.