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 2024-12-24.

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	14% 11% 4 8% 5% 4 4 3 5% 7% 36%	101687
	Night	16% 13% 5% 9% 5% 4 4 3 4 6% 31%	98502
Transparency	Day	47% 7% 12% 21% 12% 1	105271
	Night	53% 5% 11% 18% 11% 1	103059
Seeing	Day	18% 14% 28% 25% 12% 3	15964
	Night	21% 12% 26% 26% 12% 1	25876

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% 27% 10% 14% 7% 4 3 2 3 3 10%	2527
	11th to 20th	Day	13% 20% 9% 18% 14% 10% 3 2 2 2 6%	2530
	21st to end	Day	22% 24% 8% 17% 6% 4 3 2 3 3 8%	2783
February	1st to 10th	Day	14% 17% 6% 15% 11% 6% 4 2 4 3 17%	1761
	11th to 20th	Day	15% 15% 6% 17% 8% 4 3 3 4 4 22%	1848
	21st to end	Day	15% 15% 5% 13% 6% 4 5% 4 4 6% 22%	1570
March	1st to 10th	Day	15% 13% 5% 9% 5% 4 4 3 5% 6% 30%	3120
	11th to 20th	Day	12% 9% 7% 10% 5% 5% 4 3 5% 7% 33%	3344
	21st to end	Day	20% 11% 7% 10% 5% 4 4 3 4 5% 27%	4022
April	1st to 10th	Day	19% 12% 3 6% 5% 3 5% 4 5% 6% 31%	2280
	11th to 20th	Day	17% 10% 3 5% 4 3 4 4 5% 6% 38%	2278
	21st to end	Day	17% 9% 3 7% 4 3 4 3 6% 7% 36%	2470
May	1st to 10th	Day	16% 6% 3 6% 5% 4 4 3 6% 8% 38%	4082
	11th to 20th	Day	13% 7% 2 5% 4 3 3 4 6% 9% 43%	4128
	21st to end	Day	11% 6% 2 5% 4 4 4 3 6% 9% 48%	4824
June	1st to 10th	Day	10% 5% 2 6% 4 4 4 3 6% 7% 48%	2660
	11th to 20th	Day	9% 5% 2 5% 4 4 5% 4 5% 9% 49%	2660
	21st to end	Day	11% 6% 2 5% 4 4 4 3 6% 7% 46%	2660
July	1st to 10th	Day	13% 7% 3 6% 4 4 4 4 6% 9% 41%	4440
	11th to 20th	Day	7% 4 1 4 3 4 3 4 5% 9% 55%	4440
	21st to end	Day	7% 5% 2 6% 4 5% 4 4 6% 8% 50%	4813
August	1st to 10th	Day	11% 5% 2 5% 4 3 4 3 5% 9% 47%	4177
	11th to 20th	Day	11% 5% 2 4 3 4 4 3 5% 7% 51%	4016
	21st to end	Day	8% 6% 3 6% 4 4 4 4 5% 9% 49%	4180
September	1st to 10th	Day	11% 7% 2 5% 4 4 5% 3 5% 8% 47%	2271
	11th to 20th	Day	12% 5% 2 4 3 4 4 3 6% 8% 49%	2090
	21st to end	Day	13% 6% 2 7% 5% 5% 4 3 6% 8% 41%	2090
October	1st to 10th	Day	18% 7% 2 6% 4 4 4 2 4 5% 44%	2090
	11th to 20th	Day	24% 11% 2 8% 5% 4 4 4 6% 6% 26%	1853
	21st to end	Day	27% 11% 3 8% 5% 5% 5% 4 5% 5% 23%	1881
November	1st to 10th	Day	15% 15% 3 6% 4 4 4 4 4 6% 35%	1762
	11th to 20th	Day	17% 25% 4 9% 5% 4 5% 3 4 5% 20%	1800
	21st to end	Day	24% 20% 7% 9% 4 4 3 3 3 4 19%	1800
December	1st to 10th	Day	16% 30% 9% 11% 5% 3 3 2 3 4 13%	1632
	11th to 20th	Day	15% 25% 13% 13% 5% 3 4 3 4 3 11%	1998
	21st to end	Day	22% 24% 8% 14% 5% 3 3 2 4 4 10%	2807
January	1st to 10th	Night	16% 26% 12% 15% 6% 4 3 3 3 3 9%	4428
	11th to 20th	Night	16% 22% 11% 17% 10% 8% 2 1 2 2 8%	4440
	21st to end	Night	24% 22% 9% 16% 6% 4 3 2 2 3 8%	4884
February	1st to 10th	Night	14% 19% 6% 17% 9% 4 3 2 3 3 18%	2413
	11th to 20th	Night	14% 17% 8% 15% 7% 4 3 3 4 4 21%	2218
	21st to end	Night	19% 14% 4 13% 7% 4 3 3 4 5% 24%	1884
March	1st to 10th	Night	17% 10% 5% 9% 5% 4 3 3 4 6% 34%	3733
	11th to 20th	Night	9% 9% 3 9% 5% 4 4 3 5% 7% 42%	3615
	21st to end	Night	19% 12% 6% 11% 5% 4 3 3 5% 5% 27%	3639
April	1st to 10th	Night	15% 11% 3 6% 5% 4 5% 5% 5% 6% 35%	1900
	11th to 20th	Night	20% 10% 3 6% 4 3 4 4 5% 6% 36%	1851
	21st to end	Night	17% 8% 3 6% 4 4 3 4 6% 7% 38%	1710
May	1st to 10th	Night	15% 9% 3 8% 5% 4 4 4 5% 8% 35%	2813
	11th to 20th	Night	19% 6% 2 6% 4 3 4 3 5% 7% 40%	2765
	21st to end	Night	16% 7% 2 6% 4 5% 4 3 6% 7% 42%	2743
June	1st to 10th	Night	11% 4 2 5% 5% 4 4 5% 6% 8% 46%	1520
	11th to 20th	Night	9% 6% 2 6% 5% 5% 4 5% 6% 8% 44%	1520
	21st to end	Night	11% 5% 2 6% 5% 4 5% 4 6% 9% 44%	1520
July	1st to 10th	Night	10% 6% 3 7% 5% 4 5% 4 6% 9% 41%	2530
	11th to 20th	Night	7% 3 1 4 4 4 4 4 5% 7% 56%	2530
	21st to end	Night	7% 5% 2 7% 5% 4 5% 4 6% 9% 46%	2750
August	1st to 10th	Night	9% 4 2 6% 4 5% 4 4 6% 8% 48%	2754
	11th to 20th	Night	11% 5% 2 5% 3 4 4 3 5% 6% 51%	2810
	21st to end	Night	9% 6% 2 7% 5% 5% 4 3 6% 7% 47%	3476
September	1st to 10th	Night	11% 5% 2 6% 4 4 5% 3 4 7% 50%	1900
	11th to 20th	Night	12% 3 2 3 4 4 4 4 5% 7% 52%	2080
	21st to end	Night	13% 7% 3 8% 5% 4 3 3 5% 7% 41%	2090
October	1st to 10th	Night	18% 5% 3 6% 4 3 4 3 4 6% 45%	2090
	11th to 20th	Night	23% 10% 3 7% 5% 3 3 3 4 5% 34%	2326
	21st to end	Night	28% 11% 3 6% 5% 3 4 2 4 5% 30%	2717
November	1st to 10th	Night	18% 13% 4 7% 4 4 4 3 3 6% 34%	2536
	11th to 20th	Night	18% 21% 6% 9% 4 4 4 2 5% 5% 22%	2600
	21st to end	Night	20% 22% 6% 9% 5% 4 3 2 4 5% 21%	2600
December	1st to 10th	Night	18% 30% 7% 11% 4 3 3 3 3 4 13%	2765
	11th to 20th	Night	17% 25% 10% 13% 5% 3 4 3 4 4 12%	3419
	21st to end	Night	26% 24% 7% 10% 4 4 4 3 3 4 11%	4933

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	79% 7% 7% 6% 1	2528
	11th to 20th	Day	86% 4 7% 2 1	2530
	21st to end	Day	81% 6% 6% 5% 1	2783
February	1st to 10th	Day	72% 6% 8% 10% 3	1761
	11th to 20th	Day	66% 5% 9% 13% 6%	1858
	21st to end	Day	62% 7% 12% 12% 5%	1570
March	1st to 10th	Day	52% 9% 13% 18% 8%	3120
	11th to 20th	Day	49% 8% 14% 21% 8% 1	3344
	21st to end	Day	59% 7% 9% 19% 6% 1	4022
April	1st to 10th	Day	52% 8% 9% 20% 11%	2280
	11th to 20th	Day	45% 7% 10% 22% 14% 3	2278
	21st to end	Day	46% 7% 13% 19% 14% 2	2470
May	1st to 10th	Day	41% 9% 12% 23% 14% 1	4120
	11th to 20th	Day	36% 9% 15% 25% 14% 2	4132
	21st to end	Day	31% 9% 13% 23% 22% 2	4837
June	1st to 10th	Day	33% 8% 11% 28% 18% 2	2660
	11th to 20th	Day	31% 8% 13% 26% 20% 2	2660
	21st to end	Day	35% 8% 15% 22% 18% 2	2660
July	1st to 10th	Day	40% 5% 14% 24% 14% 3	4371
	11th to 20th	Day	25% 6% 15% 34% 19% 1	4365
	21st to end	Day	31% 7% 16% 21% 21% 3	4662
August	1st to 10th	Day	34% 6% 13% 31% 15% 1	4162
	11th to 20th	Day	31% 7% 13% 32% 15% 1	4055
	21st to end	Day	32% 6% 14% 28% 19% 2	4179
September	1st to 10th	Day	36% 7% 14% 26% 15% 3	2271
	11th to 20th	Day	32% 6% 13% 31% 17% 2	2090
	21st to end	Day	40% 6% 14% 25% 16%	2090
October	1st to 10th	Day	30% 4 8% 40% 17% 1	3480
	11th to 20th	Day	43% 6% 11% 23% 17%	3056
	21st to end	Day	53% 4 12% 21% 8% 1	3081
November	1st to 10th	Day	49% 7% 13% 19% 12% 1	1762
	11th to 20th	Day	68% 4 9% 13% 4 1	1800
	21st to end	Day	69% 6% 11% 11% 4	1800
December	1st to 10th	Day	77% 5% 9% 7% 2	1632
	11th to 20th	Day	75% 8% 9% 7% 1	1995
	21st to end	Day	80% 4 7% 8% 1	2807
January	1st to 10th	Night	79% 5% 9% 6% 1	4428
	11th to 20th	Night	85% 3 6% 4 1	4440
	21st to end	Night	84% 4 7% 4 1	4884
February	1st to 10th	Night	72% 5% 8% 10% 5%	2413
	11th to 20th	Night	67% 5% 7% 15% 6%	2219
	21st to end	Night	63% 6% 10% 13% 7% 1	1884
March	1st to 10th	Night	51% 7% 12% 23% 7%	3733
	11th to 20th	Night	41% 7% 14% 23% 12% 3	3615
	21st to end	Night	59% 6% 9% 17% 7% 1	3639
April	1st to 10th	Night	47% 8% 12% 19% 13% 1	1900
	11th to 20th	Night	48% 5% 8% 17% 18% 3	1851
	21st to end	Night	43% 8% 13% 18% 15% 3	1710
May	1st to 10th	Night	46% 7% 12% 20% 14% 1	2840
	11th to 20th	Night	43% 6% 10% 22% 16% 3	2766
	21st to end	Night	40% 8% 10% 18% 22% 2	2751
June	1st to 10th	Night	34% 8% 12% 28% 17% 3	1520
	11th to 20th	Night	36% 7% 11% 25% 18% 3	1520
	21st to end	Night	36% 6% 16% 23% 16% 3	1520
July	1st to 10th	Night	40% 5% 13% 23% 12% 7%	2490
	11th to 20th	Night	27% 5% 14% 26% 26% 2	2482
	21st to end	Night	33% 7% 14% 18% 26% 2	2662
August	1st to 10th	Night	33% 6% 14% 29% 18% 1	2745
	11th to 20th	Night	32% 6% 9% 32% 19% 1	2837
	21st to end	Night	36% 5% 10% 27% 20% 2	3476
September	1st to 10th	Night	34% 6% 14% 25% 18% 3	1900
	11th to 20th	Night	31% 5% 11% 31% 20% 2	2080
	21st to end	Night	43% 6% 12% 24% 15% 1	2090
October	1st to 10th	Night	31% 4 9% 34% 21% 1	3480
	11th to 20th	Night	42% 4 12% 22% 20%	3862
	21st to end	Night	48% 3 9% 25% 14%	4467
November	1st to 10th	Night	53% 5% 10% 19% 12% 1	2536
	11th to 20th	Night	64% 5% 10% 14% 6% 1	2600
	21st to end	Night	66% 5% 12% 14% 2	2600
December	1st to 10th	Night	77% 5% 7% 8% 3	2765
	11th to 20th	Night	75% 6% 11% 7% 2	3421
	21st to end	Night	77% 6% 10% 6% 1	4933

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	25% 20% 36% 14% 4	270
	21st to end	Day	29% 18% 36% 16% 2	297
February	1st to 10th	Day	23% 29% 28% 16% 3 1	270
	11th to 20th	Day	23% 29% 33% 13% 1	270
	21st to end	Day	24% 31% 34% 10% 1	225
March	1st to 10th	Day	17% 30% 37% 13% 2	270
	11th to 20th	Day	21% 22% 31% 19% 7% 1	376
	21st to end	Day	26% 19% 29% 19% 6% 1	506
April	1st to 10th	Day	25% 18% 35% 18% 5%	460
	11th to 20th	Day	22% 23% 30% 17% 6% 3	452
	21st to end	Day	22% 18% 31% 20% 8% 1	460
May	1st to 10th	Day	20% 17% 31% 24% 6% 2	463
	11th to 20th	Day	16% 11% 30% 29% 11% 3	508
	21st to end	Day	12% 8% 30% 31% 16% 4	734
June	1st to 10th	Day	12% 8% 31% 33% 13% 3	680
	11th to 20th	Day	12% 8% 26% 37% 14% 3	680
	21st to end	Day	12% 9% 31% 32% 14% 2	680
July	1st to 10th	Day	9% 6% 22% 33% 24% 7%	671
	11th to 20th	Day	10% 6% 25% 38% 16% 5%	668
	21st to end	Day	7% 5% 25% 39% 19% 5%	739
August	1st to 10th	Day	10% 5% 21% 30% 24% 10%	534
	11th to 20th	Day	11% 5% 23% 31% 22% 8%	479
	21st to end	Day	12% 5% 19% 34% 23% 6%	539
September	1st to 10th	Day	13% 7% 22% 31% 21% 6%	490
	11th to 20th	Day	9% 6% 19% 30% 28% 9%	490
	21st to end	Day	17% 14% 18% 26% 18% 7%	490
October	1st to 10th	Day	20% 14% 22% 26% 17% 2	490
	11th to 20th	Day	27% 19% 26% 23% 4	367
	21st to end	Day	33% 17% 33% 13% 3 1	330
November	1st to 10th	Day	26% 18% 29% 20% 6%	300
	11th to 20th	Day	31% 25% 29% 14% 2	300
	21st to end	Day	33% 17% 38% 10% 2	300
December	1st to 10th	Day	30% 26% 25% 15% 4	300
	11th to 20th	Day	25% 29% 31% 12% 2	300
	21st to end	Day	28% 26% 31% 12% 2	306
January	1st to 10th	Night	25% 21% 31% 18% 5%	950
	11th to 20th	Night	28% 18% 31% 20% 3 1	950
	21st to end	Night	24% 15% 34% 23% 4	1045
February	1st to 10th	Night	23% 18% 34% 20% 5%	811
	11th to 20th	Night	22% 19% 31% 23% 4	743
	21st to end	Night	27% 18% 33% 19% 3	628
March	1st to 10th	Night	22% 16% 31% 24% 6% 1	760
	11th to 20th	Night	18% 15% 34% 26% 7% 1	760
	21st to end	Night	23% 12% 29% 28% 7% 1	735
April	1st to 10th	Night	17% 16% 33% 26% 7% 1	570
	11th to 20th	Night	25% 12% 28% 26% 7% 1	563
	21st to end	Night	18% 13% 28% 29% 10% 1	570
May	1st to 10th	Night	19% 7% 29% 34% 10% 2	570
	11th to 20th	Night	20% 7% 24% 34% 14% 1	561
	21st to end	Night	14% 5% 24% 32% 24% 2	617
June	1st to 10th	Night	12% 4 24% 40% 19% 1	570
	11th to 20th	Night	11% 4 29% 34% 21% 1	570
	21st to end	Night	13% 5% 21% 35% 24% 3	570
July	1st to 10th	Night	9% 3 15% 37% 33% 4	555
	11th to 20th	Night	8% 3 17% 40% 28% 4	552
	21st to end	Night	9% 2 15% 42% 29% 3	624
August	1st to 10th	Night	9% 2 13% 41% 30% 5%	567
	11th to 20th	Night	12% 4 12% 39% 27% 7%	564
	21st to end	Night	10% 5% 17% 37% 29% 4	627
September	1st to 10th	Night	13% 5% 17% 37% 25% 4	570
	11th to 20th	Night	12% 5% 17% 32% 30% 5%	750
	21st to end	Night	16% 9% 23% 27% 19% 5%	760
October	1st to 10th	Night	20% 7% 22% 31% 18% 1	760
	11th to 20th	Night	28% 14% 25% 23% 9% 1	760
	21st to end	Night	35% 13% 26% 21% 5%	836
November	1st to 10th	Night	26% 16% 27% 22% 9% 1	780
	11th to 20th	Night	31% 20% 28% 17% 4	800
	21st to end	Night	33% 15% 31% 18% 4	800
December	1st to 10th	Night	31% 20% 29% 16% 4	965
	11th to 20th	Night	30% 19% 32% 16% 3	1000
	21st to end	Night	35% 19% 31% 14% 1	1063

Page generated at 2024-12-21 04:13:54. Version ac07

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