This report describes the historical weather record at the Indira Gandhi International Airport (New Delhi, India) during 1990. 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 1990.
1990 was not a leap year, so it has 365 days and no February 29th. The first leap year before 1990 was 1988 and the first after was 1992.
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 1990 they occurred on:
|Spring Equinox||Tuesday, 20 March 1990.|
|Summer Solstice||Thursday, 21 June 1990.|
|Fall Equinox||Sunday, 23 September 1990.|
|Winter Solstice||Saturday, 22 December 1990.|
The hottest day of 1990 was January 21, with a high temperature of 72°F. For reference, on that day the average high temperature is 68°F and the high temperature exceeds 75°F only one day in ten. The hottest month of 1990 was January with an average daily high temperature of 65°F.
Relative to the average, the hottest day was January 21. The high temperature that day was 72°F, compared to the average of 68°F, a difference of 4°F. In relative terms the warmest month was January, with an average high temperature of 65°F, compared to an typical value of 67°F.
The month of January had the largest fraction of warmer than average days with 10% days with higher than average high temperatures.
The coldest day of 1990 was March 9, with a low temperature of -1°F. For reference, on that day the average low temperature is 60°F and the low temperature drops below 54°F only one day in ten. The coldest month of 1990 was March with an average daily low temperature of 33°F.
Relative to the average, the coldest day was March 9. The low temperature that day was -1°F, compared to the average of 60°F, a difference of 61°F. In relative terms the coldest month was March, with an average low temperature of 33°F, compared to an typical value of 62°F.
The month of February had the largest fraction of cooler than average days with 7% days with lower than average low temperatures.
This station did not reliably report the cloud coverage during1990 but there is enough reported data to warrant the inclusion of the following graphs.
Either snow is exceptionally rare at this location or this station did not reliably report it during 1990.
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 1990 was January with an average daily low humidity of 93%, and the most humid month was April with an average daily low humidity of 100%.
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 1990, January had 1 dry day, 3 comfortable days, and no humid days; April had no dry days, no comfortable days, and no humid days; July had no dry days, no comfortable days, and no humid days; and October had no dry days, no comfortable days, and no humid days.
The highest sustained wind speed was 6 mph, occurring on March 11; the highest daily mean wind speed was 6 mph (March 11);
The windiest month was March, with an average wind speed of 3 mph. The least windy month was February, with an average wind speed of 1 mph.
This station did not reliably report the visibility during 1990.
This station did not reliably report the cloud ceiling during 1990.