Vivekananda Monastery
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Vivekananda Monastery clear sky chart from 2005-11-06 to 2024-01-16.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	15% 10% 4 7% 6% 3 4 4 5% 7% 35%	74868
	Night	17% 12% 5% 8% 6% 3 4 4 4 6% 31%	74970
Transparency	Day	49% 7% 12% 20% 11% 1	74569
	Night	55% 6% 11% 17% 10% 1	74790
Seeing	Day	18% 14% 27% 26% 12% 3	14648
	Night	22% 12% 26% 26% 12% 2	24634

By Month

Percentage Cloud Cover SE (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	15% 18% 9% 15% 10% 3 5% 3 4 4 14%	1517
	11th to 20th	Day	16% 19% 10% 15% 10% 5% 4 3 3 4 11%	1485
	21st to end	Day	15% 23% 9% 15% 10% 4 5% 4 3 3 11%	1584
February	1st to 10th	Day	15% 16% 8% 13% 14% 5% 4 3 4 3 15%	1669
	11th to 20th	Day	15% 13% 8% 15% 10% 4 4 3 4 4 21%	1748
	21st to end	Day	16% 14% 7% 12% 7% 3 4 5% 4 6% 21%	1480
March	1st to 10th	Day	13% 11% 6% 9% 7% 4 5% 5% 5% 6% 28%	1800
	11th to 20th	Day	12% 10% 5% 7% 6% 3 4 4 6% 7% 36%	1900
	21st to end	Day	18% 11% 5% 8% 6% 2 5% 4 4 7% 30%	2289
April	1st to 10th	Day	20% 10% 4 6% 6% 3 4 5% 5% 7% 30%	2160
	11th to 20th	Day	17% 10% 3 5% 4 2 4 5% 5% 7% 38%	2156
	21st to end	Day	18% 8% 3 6% 5% 3 4 4 6% 7% 35%	2340
May	1st to 10th	Day	16% 6% 3 7% 6% 3 5% 5% 6% 8% 35%	2340
	11th to 20th	Day	16% 7% 3 5% 5% 3 3 4 5% 8% 40%	2320
	21st to end	Day	11% 5% 2 5% 5% 3 5% 4 5% 9% 45%	2725
June	1st to 10th	Day	10% 5% 2 5% 5% 3 4 4 6% 7% 49%	2520
	11th to 20th	Day	9% 5% 2 4 4 3 6% 4 5% 9% 50%	2520
	21st to end	Day	12% 6% 2 4 4 3 4 4 6% 8% 47%	2520
July	1st to 10th	Day	7% 4 2 4 4 2 4 4 6% 10% 55%	2520
	11th to 20th	Day	9% 4 2 4 3 3 4 5% 6% 9% 51%	2520
	21st to end	Day	8% 4 1 4 5% 3 4 5% 6% 8% 52%	2743
August	1st to 10th	Day	9% 3 2 5% 5% 2 4 5% 6% 10% 48%	2373
	11th to 20th	Day	10% 4 2 4 5% 3 4 5% 6% 8% 50%	2289
	21st to end	Day	10% 5% 2 4 4 3 3 5% 5% 8% 51%	2376
September	1st to 10th	Day	12% 7% 3 4 5% 3 4 5% 5% 8% 45%	2152
	11th to 20th	Day	13% 5% 3 3 4 3 4 4 5% 9% 48%	1980
	21st to end	Day	13% 5% 2 6% 6% 3 5% 4 6% 8% 41%	1980
October	1st to 10th	Day	19% 6% 2 5% 5% 3 4 4 4 5% 43%	1980
	11th to 20th	Day	25% 11% 2 7% 6% 3 4 5% 6% 6% 25%	1756
	21st to end	Day	28% 11% 3 7% 6% 4 4 5% 4 5% 22%	1782
November	1st to 10th	Day	15% 14% 3 5% 5% 3 4 5% 4 6% 36%	1672
	11th to 20th	Day	18% 23% 5% 7% 5% 4 5% 4 4 5% 20%	1710
	21st to end	Day	24% 19% 7% 8% 5% 2 4 3 3 5% 20%	1710
December	1st to 10th	Day	16% 27% 12% 10% 5% 3 3 3 3 4 14%	1551
	11th to 20th	Day	15% 23% 14% 12% 7% 3 3 5% 3 4 12%	1918
	21st to end	Day	22% 23% 9% 12% 7% 3 3 3 4 4 10%	2783
January	1st to 10th	Night	18% 18% 10% 14% 10% 3 4 4 3 4 12%	2648
	11th to 20th	Night	18% 18% 11% 13% 9% 4 4 2 3 4 14%	2603
	21st to end	Night	16% 19% 12% 15% 10% 4 4 3 3 4 10%	2772
February	1st to 10th	Night	15% 18% 8% 16% 11% 4 3 3 3 3 15%	2285
	11th to 20th	Night	15% 16% 9% 13% 9% 4 4 3 4 4 20%	2098
	21st to end	Night	20% 13% 5% 12% 7% 4 3 3 4 5% 24%	1776
March	1st to 10th	Night	17% 10% 5% 8% 6% 3 3 4 5% 6% 32%	2160
	11th to 20th	Night	13% 9% 3 7% 6% 3 4 3 4 7% 40%	2059
	21st to end	Night	20% 9% 4 8% 4 3 3 4 5% 6% 33%	2083
April	1st to 10th	Night	15% 10% 4 6% 6% 3 5% 6% 5% 6% 35%	1800
	11th to 20th	Night	20% 9% 3 5% 5% 2 4 5% 5% 6% 37%	1753
	21st to end	Night	17% 7% 3 5% 5% 3 3 5% 5% 7% 38%	1620
May	1st to 10th	Night	16% 8% 3 8% 6% 4 5% 5% 5% 7% 33%	1620
	11th to 20th	Night	20% 5% 2 5% 4 3 4 4 6% 8% 39%	1571
	21st to end	Night	11% 6% 3 6% 5% 3 5% 5% 7% 8% 41%	1551
June	1st to 10th	Night	11% 4 2 4 6% 3 4 6% 5% 8% 46%	1440
	11th to 20th	Night	10% 6% 2 5% 5% 3 4 5% 5% 9% 45%	1440
	21st to end	Night	11% 4 3 5% 5% 3 5% 5% 6% 9% 45%	1440
July	1st to 10th	Night	8% 3 3 5% 5% 2 4 4 6% 9% 51%	1440
	11th to 20th	Night	8% 3 2 4 5% 3 5% 5% 6% 8% 52%	1440
	21st to end	Night	7% 3 2 4 6% 3 5% 6% 6% 10% 48%	1575
August	1st to 10th	Night	8% 3 2 4 5% 3 5% 5% 7% 8% 50%	1565
	11th to 20th	Night	10% 4 2 5% 4 3 5% 5% 7% 7% 50%	1609
	21st to end	Night	9% 5% 2 5% 5% 3 4 4 5% 6% 52%	1980
September	1st to 10th	Night	11% 5% 2 5% 5% 3 5% 5% 4 7% 48%	1800
	11th to 20th	Night	13% 3 2 3 4 3 4 5% 5% 7% 52%	1970
	21st to end	Night	13% 6% 3 7% 6% 3 4 3 6% 7% 42%	1980
October	1st to 10th	Night	19% 5% 3 5% 4 2 4 4 4 6% 43%	1980
	11th to 20th	Night	24% 10% 3 7% 5% 3 3 3 3 5% 33%	2203
	21st to end	Night	30% 11% 4 5% 5% 2 3 3 4 4 29%	2574
November	1st to 10th	Night	18% 12% 5% 6% 5% 3 4 4 4 6% 34%	2406
	11th to 20th	Night	19% 20% 7% 8% 4 3 4 3 4 5% 23%	2470
	21st to end	Night	20% 19% 7% 8% 5% 3 3 3 4 5% 22%	2470
December	1st to 10th	Night	19% 26% 10% 9% 5% 3 3 3 3 4 13%	2626
	11th to 20th	Night	17% 23% 11% 12% 5% 3 4 3 4 5% 13%	3279
	21st to end	Night	27% 23% 7% 9% 5% 3 4 4 3 4 11%	4884

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	75% 6% 8% 9% 2	1518
	11th to 20th	Day	79% 6% 10% 4 1	1485
	21st to end	Day	81% 5% 6% 6% 3	1584
February	1st to 10th	Day	74% 6% 8% 10% 2	1669
	11th to 20th	Day	68% 5% 9% 12% 6%	1758
	21st to end	Day	64% 8% 11% 12% 6%	1480
March	1st to 10th	Day	56% 7% 13% 16% 8%	1800
	11th to 20th	Day	47% 7% 13% 20% 11% 2	1900
	21st to end	Day	54% 6% 11% 21% 6% 1	2289
April	1st to 10th	Day	52% 8% 9% 20% 11%	2160
	11th to 20th	Day	45% 7% 10% 21% 14% 3	2156
	21st to end	Day	47% 7% 13% 18% 14% 2	2340
May	1st to 10th	Day	45% 8% 13% 22% 10% 1	2340
	11th to 20th	Day	43% 7% 11% 23% 14% 2	2324
	21st to end	Day	36% 7% 15% 26% 14% 2	2725
June	1st to 10th	Day	33% 8% 11% 28% 18% 2	2520
	11th to 20th	Day	31% 8% 13% 25% 21% 2	2520
	21st to end	Day	34% 8% 15% 22% 18% 2	2520
July	1st to 10th	Day	25% 6% 14% 32% 18% 4	2451
	11th to 20th	Day	28% 8% 13% 30% 19% 2	2445
	21st to end	Day	29% 8% 14% 27% 19% 3	2591
August	1st to 10th	Day	29% 8% 15% 31% 14% 2	2358
	11th to 20th	Day	31% 9% 16% 28% 15% 2	2289
	21st to end	Day	30% 7% 14% 26% 19% 3	2376
September	1st to 10th	Day	37% 7% 14% 25% 14% 3	2152
	11th to 20th	Day	33% 6% 13% 32% 14% 2	1980
	21st to end	Day	39% 6% 14% 26% 15% 1	1980
October	1st to 10th	Day	45% 6% 8% 28% 13% 1	1980
	11th to 20th	Day	58% 7% 12% 16% 7%	1756
	21st to end	Day	63% 6% 11% 13% 6% 1	1782
November	1st to 10th	Day	49% 7% 12% 19% 12% 1	1672
	11th to 20th	Day	67% 4 10% 14% 4 1	1710
	21st to end	Day	68% 6% 11% 11% 4	1710
December	1st to 10th	Day	77% 5% 9% 7% 3	1551
	11th to 20th	Day	75% 8% 9% 7% 1	1915
	21st to end	Day	80% 4 7% 8% 1	2783
January	1st to 10th	Night	77% 3 9% 8% 2	2648
	11th to 20th	Night	77% 5% 10% 6% 2	2603
	21st to end	Night	80% 4 8% 6% 2	2772
February	1st to 10th	Night	75% 5% 7% 9% 3	2285
	11th to 20th	Night	68% 5% 8% 13% 5%	2099
	21st to end	Night	64% 5% 10% 13% 7% 1	1776
March	1st to 10th	Night	53% 6% 13% 20% 8% 1	2160
	11th to 20th	Night	46% 5% 13% 22% 12% 3	2059
	21st to end	Night	53% 5% 10% 22% 9% 1	2083
April	1st to 10th	Night	47% 8% 12% 19% 13% 1	1800
	11th to 20th	Night	48% 5% 8% 17% 18% 4	1753
	21st to end	Night	43% 8% 13% 17% 15% 3	1620
May	1st to 10th	Night	49% 6% 11% 20% 11% 1	1620
	11th to 20th	Night	44% 5% 11% 20% 16% 3	1572
	21st to end	Night	39% 8% 13% 23% 15% 2	1552
June	1st to 10th	Night	34% 7% 11% 28% 17% 3	1440
	11th to 20th	Night	35% 7% 11% 25% 18% 3	1440
	21st to end	Night	35% 6% 16% 24% 15% 3	1440
July	1st to 10th	Night	29% 5% 14% 28% 19% 5%	1400
	11th to 20th	Night	29% 6% 14% 27% 21% 3	1392
	21st to end	Night	30% 8% 14% 24% 20% 4	1487
August	1st to 10th	Night	29% 8% 16% 28% 17% 2	1556
	11th to 20th	Night	31% 8% 13% 30% 16% 2	1609
	21st to end	Night	32% 7% 11% 27% 21% 3	1980
September	1st to 10th	Night	36% 6% 13% 25% 17% 3	1800
	11th to 20th	Night	32% 6% 11% 32% 17% 2	1970
	21st to end	Night	42% 6% 12% 25% 14% 1	1980
October	1st to 10th	Night	43% 5% 9% 26% 16% 2	1980
	11th to 20th	Night	54% 5% 11% 19% 10% 1	2203
	21st to end	Night	60% 5% 12% 16% 7% 1	2574
November	1st to 10th	Night	52% 5% 11% 19% 12% 1	2406
	11th to 20th	Night	64% 5% 11% 14% 6% 1	2470
	21st to end	Night	65% 6% 13% 15% 2	2470
December	1st to 10th	Night	77% 4 7% 8% 3	2626
	11th to 20th	Night	75% 6% 11% 7% 2	3281
	21st to end	Night	77% 6% 10% 6% 1	4884

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	23% 24% 27% 20% 4 1	270
	11th to 20th	Day	26% 19% 37% 14% 4	257
	21st to end	Day	27% 19% 37% 16% 2	264
February	1st to 10th	Day	26% 29% 29% 15% 1	240
	11th to 20th	Day	24% 28% 35% 11% 2	240
	21st to end	Day	25% 33% 32% 8% 2	198
March	1st to 10th	Day	18% 32% 36% 12% 3	240
	11th to 20th	Day	21% 19% 31% 20% 8% 1	340
	21st to end	Day	26% 18% 29% 19% 6% 1	462
April	1st to 10th	Day	25% 15% 35% 19% 5%	420
	11th to 20th	Day	23% 22% 28% 18% 6% 3	412
	21st to end	Day	22% 17% 30% 20% 9% 1	420
May	1st to 10th	Day	21% 17% 29% 24% 7% 2	423
	11th to 20th	Day	17% 12% 29% 28% 10% 4	466
	21st to end	Day	12% 7% 30% 30% 17% 4	679
June	1st to 10th	Day	12% 6% 31% 34% 14% 3	630
	11th to 20th	Day	13% 8% 24% 38% 14% 3	630
	21st to end	Day	12% 8% 31% 33% 14% 3	630
July	1st to 10th	Day	8% 5% 21% 34% 25% 7%	621
	11th to 20th	Day	10% 5% 25% 39% 16% 5%	618
	21st to end	Day	7% 5% 25% 40% 18% 5%	684
August	1st to 10th	Day	9% 4 21% 30% 25% 10%	492
	11th to 20th	Day	10% 5% 22% 32% 23% 8%	439
	21st to end	Day	12% 5% 20% 34% 22% 7%	495
September	1st to 10th	Day	15% 7% 21% 32% 20% 5%	450
	11th to 20th	Day	10% 7% 20% 31% 26% 8%	450
	21st to end	Day	16% 15% 17% 26% 19% 7%	450
October	1st to 10th	Day	21% 13% 22% 25% 17% 2	450
	11th to 20th	Day	29% 20% 26% 22% 4	334
	21st to end	Day	34% 16% 34% 11% 3 1	297
November	1st to 10th	Day	24% 18% 29% 21% 7%	270
	11th to 20th	Day	30% 25% 29% 14% 2	270
	21st to end	Day	33% 17% 38% 10% 2	270
December	1st to 10th	Day	30% 26% 26% 14% 4	270
	11th to 20th	Day	24% 29% 31% 13% 3	270
	21st to end	Day	28% 27% 32% 11% 2	297
January	1st to 10th	Night	25% 21% 31% 18% 5%	950
	11th to 20th	Night	28% 18% 31% 20% 3 1	930
	21st to end	Night	22% 16% 35% 23% 4	990
February	1st to 10th	Night	24% 18% 34% 19% 4	768
	11th to 20th	Night	23% 19% 31% 22% 4	703
	21st to end	Night	28% 17% 32% 19% 3	592
March	1st to 10th	Night	22% 16% 30% 25% 7% 1	720
	11th to 20th	Night	19% 14% 33% 27% 7% 1	720
	21st to end	Night	23% 12% 29% 29% 7% 1	697
April	1st to 10th	Night	17% 16% 32% 26% 8% 1	540
	11th to 20th	Night	24% 11% 29% 27% 8% 1	533
	21st to end	Night	19% 12% 27% 31% 10% 1	540
May	1st to 10th	Night	20% 6% 28% 34% 10% 2	540
	11th to 20th	Night	21% 7% 23% 34% 14% 1	531
	21st to end	Night	14% 4 23% 32% 25% 2	584
June	1st to 10th	Night	12% 3 23% 41% 20% 1	540
	11th to 20th	Night	11% 4 28% 34% 22% 1	540
	21st to end	Night	13% 4 20% 36% 25% 3	540
July	1st to 10th	Night	9% 2 14% 36% 34% 4	525
	11th to 20th	Night	8% 2 17% 41% 28% 4	522
	21st to end	Night	9% 2 16% 42% 29% 3	591
August	1st to 10th	Night	9% 2 12% 42% 30% 5%	537
	11th to 20th	Night	12% 4 11% 39% 28% 7%	534
	21st to end	Night	10% 5% 17% 37% 28% 4	594
September	1st to 10th	Night	13% 5% 16% 37% 24% 5%	540
	11th to 20th	Night	13% 6% 17% 31% 29% 5%	710
	21st to end	Night	17% 9% 22% 26% 20% 5%	720
October	1st to 10th	Night	21% 7% 21% 30% 19% 1	720
	11th to 20th	Night	29% 14% 25% 22% 8% 1	720
	21st to end	Night	36% 13% 25% 20% 5% 1	792
November	1st to 10th	Night	26% 16% 26% 22% 10% 1	740
	11th to 20th	Night	30% 20% 27% 18% 4	760
	21st to end	Night	32% 15% 31% 19% 4	760
December	1st to 10th	Night	31% 20% 29% 16% 4	916
	11th to 20th	Night	29% 18% 33% 17% 3	950
	21st to end	Night	35% 19% 30% 14% 1	1045

Page generated at 2024-01-13 19:28:31. Version ac07

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