This report describes the historical weather record at the Indira Gandhi International Airport (New Delhi, India) during the last 12 months. 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 the last 12 months.
2017 is not a leap year, so it has 365 days and no February 29th. The first leap year before 2017 was 2016 and the first after will be 2020.
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 2017 they occurred on:
|Spring Equinox||Monday, 20 March 2017.|
|Summer Solstice||Wednesday, 21 June 2017.|
|Fall Equinox||Friday, 22 September 2017.|
|Winter Solstice||Thursday, 21 December 2017.|
The hottest day of the last 12 months was May 18, with a high temperature of 117Â°F. For reference, on that day the average high temperature is 104Â°F and the high temperature exceeds 111Â°F only one day in ten. The hottest month of the last 12 months was May with an average daily high temperature of 105Â°F.
Relative to the average, the hottest day was November 29. The high temperature that day was 95Â°F, compared to the average of 78Â°F, a difference of 17Â°F. In relative terms the warmest month was April, with an average high temperature of 104Â°F, compared to an typical value of 98Â°F.
The longest warm spell was from October 11 to October 31, constituting 21 consecutive days with warmer than average high temperatures. The month of April had the largest fraction of warmer than average days with 93% days with higher than average high temperatures.
The coldest day of the last 12 months was January 11, with a low temperature of 39Â°F. For reference, on that day the average low temperature is 46Â°F and the low temperature drops below 40Â°F only one day in ten. The coldest month of the last 12 months was January with an average daily low temperature of 49Â°F.
Relative to the average, the coldest day was March 13. The low temperature that day was 50Â°F, compared to the average of 61Â°F, a difference of 11Â°F. In relative terms the coldest month was March, with an average low temperature of 57Â°F, compared to an typical value of 62Â°F.
The longest cold spell was from October 28 to November 13, constituting 17 consecutive days with cooler than average low temperatures. The month of November had the largest fraction of cooler than average days with 73% days with lower than average low temperatures.
The clearest month of the last 12 months was October, with 87% of days being more clear than cloudy. The longest spell of clear weather was from October 7 to November 11, constituting 36 consecutive days that were clearer than they were cloudy.
The cloudiest month of the last 12 months was July, with 52% of days being more cloudy than clear. The longest spell of cloudy weather was from July 27 to August 3, constituting 8 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 the last 12 months with the most precipitation observations was July 30. There were 14 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 98 hourly present weather reports involving some form of precipitation.
As determined by the present weather reports, the longest dry spell was from October 5 to January 7, constituting 95 consecutive days with no observed precipitation. The months of November, December, and February were completely without observed precipitation.
The month with the largest fraction of days with at least some observed precipitation was July, with 65% of days reporting some observed precipitation.
Either snow is exceptionally rare at this location or this station did not reliably report it during the last 12 months.
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 the last 12 months was April with an average daily low humidity of 12%, and the most humid month was July with an average daily low humidity of 61%.
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 50Â°F will feel a bit dry to some people, but comfortable to people accustomed to dry conditions; dew points from 50Â°F to 68Â°F are fairly comfortable to most people, and dew points above 68Â°F are increasingly uncomfortable, becoming oppressive around 77Â°F.
To take some examples, and basing our categorization on the daily high dew point in the last 12 months, April had 1 dry day, 28 comfortable days, and 1 humid day; July had no dry days, no comfortable days, and 31 humid days; October had no dry days, 20 comfortable days, and 11 humid days; and January had 9 dry days, 22 comfortable days, and no humid days.
The highest sustained wind speed was 34 mph, occurring on June 17; the highest daily mean wind speed was 11 mph (March 22); and the highest wind gust speed was 46 mph (June 17).
The windiest month was June, with an average wind speed of 8 mph. The least windy month was October, with an average wind speed of 4 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 the last 12 months with the lowest average visibility was November 6, 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 2.4 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 the last 12 months with the lowest average cloud ceiling was May 4, with an average cloud ceiling of 4801'. The month with the lowest average cloud ceiling was August, with an average cloud ceiling of 9252'. The month of November has the highest average cloud ceiling, with an average cloud ceiling of 10000'.