Aramesh
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Aramesh clear sky chart from 2005-11-06 to 2024-06-30.

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	10% 8% 3 8% 5% 5% 5% 4 6% 7% 38%	89612
	Night	9% 7% 3 7% 5% 5% 5% 4 6% 8% 41%	89481
Transparency	Day	42% 9% 11% 18% 15% 4	89386
	Night	39% 9% 13% 19% 15% 4	89311
Seeing	Day	18% 16% 25% 21% 14% 7%	14498
	Night	15% 13% 23% 28% 18% 3	24593

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	7% 8% 3 8% 4 4 4 3 7% 9% 43%	2836
	11th to 20th	Day	7% 8% 3 8% 5% 5% 5% 4 5% 5% 46%	2840
	21st to end	Day	9% 12% 5% 9% 4 4 4 3 4 6% 40%	3124
February	1st to 10th	Day	9% 8% 3 8% 5% 5% 6% 4 5% 6% 40%	1814
	11th to 20th	Day	9% 9% 3 8% 6% 5% 4 3 5% 7% 41%	1848
	21st to end	Day	9% 8% 4 7% 6% 5% 6% 4 7% 6% 39%	1570
March	1st to 10th	Day	14% 8% 3 7% 5% 4 4 4 5% 6% 39%	3333
	11th to 20th	Day	8% 8% 3 7% 4 3 4 3 5% 5% 50%	3480
	21st to end	Day	13% 9% 3 8% 5% 5% 5% 4 5% 6% 39%	3815
April	1st to 10th	Day	8% 8% 3 7% 4 5% 5% 4 6% 8% 43%	2090
	11th to 20th	Day	12% 8% 3 6% 4 5% 4 4 6% 6% 43%	2284
	21st to end	Day	11% 7% 3 7% 5% 5% 4 3 5% 6% 44%	2470
May	1st to 10th	Day	9% 7% 2 9% 6% 6% 6% 5% 8% 8% 34%	4082
	11th to 20th	Day	13% 8% 3 9% 6% 6% 6% 5% 7% 7% 31%	4081
	21st to end	Day	7% 6% 2 7% 5% 6% 6% 5% 8% 10% 37%	4476
June	1st to 10th	Day	9% 7% 2 9% 6% 8% 7% 6% 8% 9% 28%	2470
	11th to 20th	Day	7% 7% 3 8% 8% 6% 7% 6% 8% 9% 30%	2470
	21st to end	Day	8% 6% 2 7% 7% 6% 8% 6% 8% 10% 32%	2457
July	1st to 10th	Day	9% 8% 4 10% 8% 7% 8% 7% 8% 9% 22%	2340
	11th to 20th	Day	11% 7% 3 9% 7% 8% 9% 6% 7% 9% 24%	2340
	21st to end	Day	9% 6% 3 10% 9% 7% 8% 6% 8% 9% 25%	2547
August	1st to 10th	Day	10% 7% 3 11% 7% 8% 7% 6% 8% 10% 23%	2327
	11th to 20th	Day	11% 8% 2 10% 7% 8% 7% 5% 8% 8% 24%	2303
	21st to end	Day	11% 7% 3 9% 6% 7% 7% 5% 8% 9% 28%	2377
September	1st to 10th	Day	10% 8% 3 8% 7% 6% 6% 5% 7% 8% 33%	1980
	11th to 20th	Day	15% 8% 4 8% 4 5% 7% 3 5% 8% 31%	1980
	21st to end	Day	14% 7% 3 6% 5% 5% 5% 4 5% 6% 40%	1980
October	1st to 10th	Day	12% 6% 2 6% 4 4 3 3 5% 6% 47%	1967
	11th to 20th	Day	7% 6% 2 5% 5% 4 4 3 5% 6% 52%	1800
	21st to end	Day	10% 7% 2 4 3 3 4 3 4 6% 54%	1980
November	1st to 10th	Day	7% 6% 2 5% 3 4 4 4 4 5% 55%	1744
	11th to 20th	Day	8% 6% 2 5% 3 4 4 4 5% 7% 52%	1710
	21st to end	Day	8% 6% 2 6% 4 5% 3 4 6% 6% 49%	1710
December	1st to 10th	Day	9% 8% 3 8% 5% 5% 6% 4 7% 6% 37%	1710
	11th to 20th	Day	8% 6% 2 5% 3 4 5% 5% 8% 8% 45%	2153
	21st to end	Day	11% 7% 3 7% 4 5% 6% 4 5% 6% 41%	3124
January	1st to 10th	Night	9% 8% 3 8% 6% 5% 5% 4 6% 7% 39%	4109
	11th to 20th	Night	5% 6% 3 7% 5% 5% 5% 6% 7% 7% 44%	4120
	21st to end	Night	8% 12% 4 10% 6% 4 5% 3 4 5% 38%	4532
February	1st to 10th	Night	6% 8% 3 8% 5% 5% 6% 4 8% 6% 42%	2361
	11th to 20th	Night	10% 10% 3 9% 5% 5% 4 4 5% 6% 39%	2218
	21st to end	Night	8% 8% 4 7% 6% 5% 5% 6% 6% 7% 37%	1884
March	1st to 10th	Night	14% 12% 4 9% 6% 5% 6% 4 6% 5% 30%	3519
	11th to 20th	Night	7% 7% 2 6% 4 5% 4 4 6% 8% 47%	3480
	21st to end	Night	11% 7% 3 7% 6% 4 5% 4 6% 7% 41%	3817
April	1st to 10th	Night	8% 8% 2 6% 5% 4 5% 4 6% 7% 46%	2090
	11th to 20th	Night	7% 7% 2 8% 5% 5% 4 3 5% 7% 47%	1858
	21st to end	Night	9% 5% 2 5% 4 5% 4 4 6% 7% 49%	1710
May	1st to 10th	Night	7% 6% 2 7% 5% 6% 6% 5% 8% 11% 36%	2813
	11th to 20th	Night	9% 7% 3 9% 6% 6% 5% 5% 7% 8% 34%	2812
	21st to end	Night	5% 5% 2 6% 5% 6% 6% 4 8% 11% 43%	3079
June	1st to 10th	Night	6% 5% 3 7% 6% 5% 6% 5% 10% 13% 36%	1710
	11th to 20th	Night	4 5% 2 5% 5% 5% 6% 5% 7% 12% 43%	1710
	21st to end	Night	6% 4 2 5% 4 5% 5% 5% 9% 11% 42%	1701
July	1st to 10th	Night	7% 7% 3 7% 5% 7% 5% 5% 9% 11% 35%	1620
	11th to 20th	Night	7% 5% 2 6% 6% 5% 7% 7% 8% 14% 33%	1620
	21st to end	Night	5% 5% 2 9% 6% 6% 6% 6% 9% 11% 35%	1771
August	1st to 10th	Night	7% 4 2 7% 5% 7% 7% 6% 8% 11% 37%	1611
	11th to 20th	Night	8% 6% 2 7% 6% 6% 7% 5% 9% 9% 36%	1598
	21st to end	Night	9% 6% 3 7% 5% 5% 5% 5% 7% 9% 38%	1956
September	1st to 10th	Night	9% 7% 3 8% 6% 5% 5% 4 8% 9% 38%	1980
	11th to 20th	Night	12% 9% 3 8% 5% 4 4 4 6% 8% 38%	1980
	21st to end	Night	13% 5% 2 6% 4 4 3 3 5% 7% 48%	1980
October	1st to 10th	Night	13% 7% 2 6% 3 4 3 3 4 6% 48%	1993
	11th to 20th	Night	9% 8% 2 7% 3 4 5% 4 5% 5% 49%	2160
	21st to end	Night	8% 7% 2 5% 3 3 4 3 5% 5% 54%	2376
November	1st to 10th	Night	9% 7% 2 6% 4 4 5% 3 6% 6% 49%	2329
	11th to 20th	Night	9% 7% 2 6% 4 3 3 3 5% 7% 49%	2470
	21st to end	Night	8% 6% 3 5% 4 5% 4 5% 6% 6% 47%	2470
December	1st to 10th	Night	8% 9% 3 9% 6% 5% 5% 5% 7% 7% 36%	2470
	11th to 20th	Night	9% 10% 3 8% 4 4 4 4 6% 6% 43%	3042
	21st to end	Night	12% 8% 4 7% 5% 5% 6% 5% 7% 8% 32%	4532

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	35% 5% 8% 23% 24% 6%	2837
	11th to 20th	Day	38% 6% 11% 15% 23% 8%	2840
	21st to end	Day	46% 4 8% 17% 22% 4	3124
February	1st to 10th	Day	43% 5% 12% 19% 16% 5%	1814
	11th to 20th	Day	43% 6% 12% 16% 18% 5%	1858
	21st to end	Day	43% 7% 9% 16% 18% 7%	1570
March	1st to 10th	Day	43% 6% 10% 16% 17% 8%	3333
	11th to 20th	Day	36% 6% 8% 15% 24% 11%	3480
	21st to end	Day	45% 8% 9% 22% 13% 5%	3815
April	1st to 10th	Day	37% 7% 12% 21% 18% 4	2090
	11th to 20th	Day	40% 7% 11% 17% 20% 6%	2284
	21st to end	Day	39% 7% 12% 25% 14% 2	2470
May	1st to 10th	Day	43% 12% 13% 20% 11% 1	4120
	11th to 20th	Day	49% 11% 11% 20% 9% 1	4085
	21st to end	Day	37% 12% 16% 19% 15% 1	4489
June	1st to 10th	Day	47% 13% 17% 16% 6% 1	2470
	11th to 20th	Day	43% 13% 17% 15% 11% 1	2470
	21st to end	Day	44% 11% 15% 16% 11% 2	2457
July	1st to 10th	Day	51% 15% 14% 13% 7% 1	2275
	11th to 20th	Day	51% 15% 16% 10% 7% 1	2271
	21st to end	Day	49% 15% 16% 13% 6% 1	2405
August	1st to 10th	Day	53% 14% 14% 15% 4	2314
	11th to 20th	Day	52% 15% 13% 13% 7% 1	2303
	21st to end	Day	49% 13% 14% 15% 7% 3	2377
September	1st to 10th	Day	44% 12% 12% 17% 12% 3	1980
	11th to 20th	Day	50% 8% 9% 16% 15% 2	1980
	21st to end	Day	43% 8% 11% 19% 14% 5%	1980
October	1st to 10th	Day	38% 7% 9% 18% 22% 6%	1967
	11th to 20th	Day	33% 6% 10% 22% 21% 9%	1800
	21st to end	Day	32% 6% 7% 24% 23% 9%	1980
November	1st to 10th	Day	30% 6% 10% 18% 27% 10%	1744
	11th to 20th	Day	32% 5% 9% 20% 26% 8%	1710
	21st to end	Day	35% 6% 8% 23% 21% 7%	1710
December	1st to 10th	Day	45% 9% 9% 18% 15% 5%	1710
	11th to 20th	Day	34% 7% 11% 19% 21% 8%	2150
	21st to end	Day	41% 5% 10% 23% 17% 4	3124
January	1st to 10th	Night	39% 5% 13% 21% 16% 7%	4109
	11th to 20th	Night	35% 7% 13% 14% 24% 8%	4120
	21st to end	Night	48% 5% 8% 14% 20% 5%	4532
February	1st to 10th	Night	39% 6% 13% 19% 18% 5%	2361
	11th to 20th	Night	45% 5% 10% 20% 16% 5%	2219
	21st to end	Night	43% 8% 12% 16% 15% 6%	1884
March	1st to 10th	Night	53% 8% 10% 12% 13% 4	3519
	11th to 20th	Night	33% 8% 9% 23% 18% 9%	3480
	21st to end	Night	41% 7% 11% 23% 12% 5%	3817
April	1st to 10th	Night	36% 8% 15% 22% 17% 3	2090
	11th to 20th	Night	35% 7% 11% 22% 20% 4	1858
	21st to end	Night	33% 9% 14% 28% 15% 1	1710
May	1st to 10th	Night	39% 14% 15% 23% 8% 1	2840
	11th to 20th	Night	43% 13% 17% 21% 7%	2813
	21st to end	Night	30% 14% 20% 26% 10%	3087
June	1st to 10th	Night	35% 17% 20% 20% 7% 1	1710
	11th to 20th	Night	30% 14% 25% 22% 8% 1	1710
	21st to end	Night	31% 14% 21% 20% 12% 2	1701
July	1st to 10th	Night	39% 15% 19% 18% 8% 1	1575
	11th to 20th	Night	36% 17% 24% 14% 7% 2	1566
	21st to end	Night	36% 17% 22% 18% 7% 1	1672
August	1st to 10th	Night	37% 17% 22% 18% 6%	1600
	11th to 20th	Night	40% 16% 17% 16% 9%	1598
	21st to end	Night	41% 14% 18% 19% 7% 1	1956
September	1st to 10th	Night	40% 13% 13% 20% 11% 2	1980
	11th to 20th	Night	44% 11% 12% 18% 14% 1	1980
	21st to end	Night	37% 8% 12% 23% 16% 4	1980
October	1st to 10th	Night	37% 8% 11% 19% 22% 3	1993
	11th to 20th	Night	37% 6% 10% 23% 19% 5%	2160
	21st to end	Night	32% 6% 8% 22% 25% 8%	2376
November	1st to 10th	Night	35% 6% 10% 20% 21% 8%	2329
	11th to 20th	Night	34% 6% 8% 20% 23% 9%	2470
	21st to end	Night	36% 6% 9% 23% 21% 6%	2470
December	1st to 10th	Night	44% 9% 12% 17% 13% 5%	2470
	11th to 20th	Night	40% 6% 9% 17% 21% 7%	3044
	21st to end	Night	46% 6% 10% 18% 17% 3	4532

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	28% 29% 32% 10% 1	270
	11th to 20th	Day	31% 28% 27% 13% 1	270
	21st to end	Day	25% 38% 29% 7% 2	297
February	1st to 10th	Day	27% 29% 32% 10% 2	270
	11th to 20th	Day	42% 30% 21% 6% 1	270
	21st to end	Day	37% 32% 25% 5% 1	225
March	1st to 10th	Day	25% 24% 31% 14% 6% 1	392
	11th to 20th	Day	24% 30% 26% 15% 5% 1	460
	21st to end	Day	25% 25% 30% 15% 5%	506
April	1st to 10th	Day	23% 23% 28% 18% 8% 1	460
	11th to 20th	Day	23% 22% 25% 19% 9% 2	452
	21st to end	Day	20% 17% 30% 18% 12% 3	460
May	1st to 10th	Day	16% 22% 26% 22% 9% 5%	463
	11th to 20th	Day	17% 13% 27% 24% 12% 7%	487
	21st to end	Day	14% 10% 22% 27% 18% 10%	529
June	1st to 10th	Day	12% 9% 27% 25% 18% 9%	490
	11th to 20th	Day	8% 9% 24% 24% 22% 12%	490
	21st to end	Day	9% 8% 33% 21% 18% 12%	486
July	1st to 10th	Day	9% 5% 16% 27% 26% 17%	445
	11th to 20th	Day	8% 4 16% 28% 23% 21%	444
	21st to end	Day	7% 3 14% 27% 31% 18%	488
August	1st to 10th	Day	15% 5% 20% 22% 19% 19%	446
	11th to 20th	Day	11% 4 15% 29% 23% 17%	439
	21st to end	Day	12% 2 19% 26% 24% 18%	495
September	1st to 10th	Day	8% 4 18% 29% 28% 13%	450
	11th to 20th	Day	16% 6% 17% 24% 27% 10%	450
	21st to end	Day	18% 6% 19% 30% 23% 5%	450
October	1st to 10th	Day	19% 10% 19% 26% 18% 8%	450
	11th to 20th	Day	14% 16% 26% 24% 18% 2	450
	21st to end	Day	17% 15% 24% 29% 11% 3	495
November	1st to 10th	Day	17% 15% 32% 24% 11% 2	342
	11th to 20th	Day	20% 23% 35% 16% 6%	270
	21st to end	Day	16% 25% 36% 16% 7% 1	270
December	1st to 10th	Day	24% 30% 31% 11% 3	270
	11th to 20th	Day	20% 23% 37% 14% 6%	270
	21st to end	Day	23% 24% 37% 11% 5% 1	297
January	1st to 10th	Night	19% 24% 30% 21% 5%	760
	11th to 20th	Night	19% 23% 32% 21% 5%	760
	21st to end	Night	17% 25% 33% 23% 3	836
February	1st to 10th	Night	17% 20% 33% 26% 4	760
	11th to 20th	Night	23% 25% 32% 18% 1	743
	21st to end	Night	22% 28% 30% 18% 2	628
March	1st to 10th	Night	18% 23% 32% 23% 4	760
	11th to 20th	Night	18% 22% 31% 21% 7% 1	760
	21st to end	Night	19% 21% 31% 22% 7%	836
April	1st to 10th	Night	18% 21% 30% 23% 7% 1	760
	11th to 20th	Night	16% 16% 30% 26% 11% 2	625
	21st to end	Night	12% 14% 28% 34% 12% 1	570
May	1st to 10th	Night	13% 12% 28% 29% 17% 1	570
	11th to 20th	Night	12% 8% 22% 35% 21% 3	561
	21st to end	Night	9% 5% 16% 31% 32% 6%	617
June	1st to 10th	Night	6% 4 18% 37% 29% 6%	570
	11th to 20th	Night	6% 2 18% 28% 34% 11%	570
	21st to end	Night	7% 3 14% 33% 36% 7%	567
July	1st to 10th	Night	9% 3 9% 28% 44% 7%	525
	11th to 20th	Night	8% 3 8% 27% 41% 13%	522
	21st to end	Night	5% 2 6% 29% 45% 12%	591
August	1st to 10th	Night	9% 2 7% 31% 42% 9%	537
	11th to 20th	Night	9% 2 11% 30% 40% 9%	534
	21st to end	Night	11% 3 9% 27% 40% 11%	623
September	1st to 10th	Night	11% 4 12% 29% 37% 8%	720
	11th to 20th	Night	16% 4 13% 29% 32% 6%	720
	21st to end	Night	16% 6% 17% 31% 27% 4	720
October	1st to 10th	Night	17% 9% 18% 23% 25% 8%	720
	11th to 20th	Night	14% 12% 25% 30% 17% 2	720
	21st to end	Night	13% 14% 23% 34% 13% 3	792
November	1st to 10th	Night	16% 10% 19% 34% 18% 3	740
	11th to 20th	Night	18% 15% 22% 33% 11% 2	760
	21st to end	Night	17% 16% 22% 32% 12% 1	760
December	1st to 10th	Night	19% 19% 27% 28% 7%	760
	11th to 20th	Night	17% 15% 30% 30% 7% 1	760
	21st to end	Night	20% 19% 30% 27% 5%	836

Page generated at 2024-06-26 22:18:44. Version ac07

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