This report describes the historical weather record at the Indira Gandhi International Airport (New Delhi, India) during 2012. 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 2012.
2012 was a leap year and thus has 366 days rather than the normal 365. Leap years occur every fourth year and the extra day is always February 29th. In 2012 February 29th falls on a Wednesday.
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 2012 they occurred on:
|Spring Equinox||Tuesday, 20 March 2012.|
|Summer Solstice||Wednesday, 20 June 2012.|
|Fall Equinox||Saturday, 22 September 2012.|
|Winter Solstice||Friday, 21 December 2012.|
The hottest day of 2012 was May 30, with a high temperature of 113°F. For reference, on that day the average high temperature is 103°F and the high temperature exceeds 111°F only one day in ten. The hottest month of 2012 was June with an average daily high temperature of 107°F.
Relative to the average, the hottest day was December 31. The high temperature that day was 84°F, compared to the average of 66°F, a difference of 18°F. In relative terms the warmest month was June, with an average high temperature of 107°F, compared to an typical value of 101°F.
The longest warm spell was from May 19 to June 6, constituting 19 consecutive days with warmer than average high temperatures. The month of June had the largest fraction of warmer than average days with 87% days with higher than average high temperatures.
The coldest day of 2012 was February 9, with a low temperature of 37°F. For reference, on that day the average low temperature is 52°F and the low temperature drops below 45°F only one day in ten. The coldest month of 2012 was January with an average daily low temperature of 46°F.
Relative to the average, the coldest day was February 9. The low temperature that day was 37°F, compared to the average of 52°F, a difference of 14°F. In relative terms the coldest month was February, with an average low temperature of 50°F, compared to an typical value of 53°F.
The longest cold spell was from October 22 to November 13, constituting 23 consecutive days with cooler than average low temperatures. The month of November had the largest fraction of cooler than average days with 93% days with lower than average low temperatures.
The clearest month of 2012 was October, with 97% of days being more clear than cloudy. The longest spell of clear weather was from October 4 to November 11, constituting 39 consecutive days that were clearer than they were cloudy.
The cloudiest month of 2012 was August, with 90% of days being more cloudy than clear. The longest spell of cloudy weather was from July 25 to August 12, constituting 19 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 2012 with the most precipitation observations was April 11. There were 12 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 August, with 81 hourly present weather reports involving some form of precipitation.
As determined by the present weather reports, the longest dry spell was from September 19 to November 29, constituting 72 consecutive days with no observed precipitation. The month October was completely without observed precipitation.
The month with the largest fraction of days with at least some observed precipitation was August, with 68% of days reporting some observed precipitation.
Either snow is exceptionally rare at this location or this station did not reliably report it during 2012.
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 2012 was May with an average daily low humidity of 13%, and the most humid month was August with an average daily low humidity of 67%.
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 2012, January had 18 dry days, 13 comfortable days, and no humid days; April had no dry days, 30 comfortable days, and no humid days; July had no dry days, 1 comfortable day, and 30 humid days; and October had no dry days, 28 comfortable days, and 3 humid days.
The highest sustained wind speed was 25 mph, occurring on April 10; the highest daily mean wind speed was 13 mph (September 6); and the highest wind gust speed was 34 mph (April 13).
The windiest month was June, with an average wind speed of 9 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 2012 with the lowest average visibility was January 2, with an average visibility of 0.2 mi. The month with the lowest average visibility was November, with an average visibility of 0.9 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 2012 with the lowest average cloud ceiling was January 3, with an average cloud ceiling of 49'. The month with the lowest average cloud ceiling was December, with an average cloud ceiling of 4905'. The month of March has the highest average cloud ceiling, with an average cloud ceiling of 9843'.