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Historical Weather For 1990 in New Delhi, India

Location

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%)

Calendar

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.

Temperature

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.

Temperature

The daily low (blue) and high (red) temperature during 1990 with the area between them shaded gray and superimposed over the corresponding averages (thick lines), and with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile). The bar at the top of the graph is red where both the daily high and low are above average, blue where they are both below average, and white otherwise.

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.

Hourly Temperature Bands

The full year of hourly temperature reports with the days of the year on the horizontal and the hours of the day on the vertical. The hourly temperature measurement is color coded into meaningful temperature bands: frigid is purple (below 15°F), freezing is blue (15°F to 32°F), cold is dark green (32°F to 50°F), cool is light green (50°F to 65°F), comfortable is yellow (65°F to 75°F), warm is light red (75°F to 85°F), hot is medium red (85°F to 100°F), sweltering is dark red (above 100°F), and missing data is pink.
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Clouds

This station did not reliably report the cloud coverage during

1990 but there is enough reported data to warrant the inclusion of the following graphs.

Cloud Coverage

The fraction of time spent in each of the five sky cover categories over the course of 1990 on a daily basis. From top (most blue) to bottom (most gray), the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside of the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data. The bar at the top of the graph is gray if the sky was cloudy or mostly cloudy for more than half the day, blue if it is clear or mostly clear for more than half the day, and blue-gray otherwise.

Hourly Cloud Coverage

The full year of hourly cloud coverage reports with the days of the year on the horizontal and the hours of the day on the vertical. The sky cover is color coded: from most blue to most gray, the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside of the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data.

Precipitation

This station did not reliably report precipitation observations or quantitative liquid-equivalent precipitation measurements during 1990.

Snow

Either snow is exceptionally rare at this location or this station did not reliably report it during 1990.

Humidity

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.

Humidity

The daily low (brown) and high (blue) relative humidity during 1990 with the area between them shaded gray and superimposed over the corresponding averages (thick lines), and with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

Dew 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.

Dew Point

The daily low (blue) and high (red) dew point during 1990 with the area between them shaded gray and superimposed over the corresponding averages (thick lines), and with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

Wind

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.

Wind Speed

The daily low and high wind speed (light gray area) and the maximum daily wind gust speed (tiny blue dashes).

Other Measurements

This station did not reliably report the visibility during 1990.

Cloud Ceiling

This station did not reliably report the cloud ceiling during 1990.