Amqui
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Amqui clear sky chart from 2005-11-06 to 2024-11-02.

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	16% 11% 4 9% 6% 6% 5% 4 5% 6% 27%	101722
	Night	15% 11% 4 10% 7% 6% 5% 4 5% 6% 26%	97331
Transparency	Day	59% 3 11% 18% 8% 1	101464
	Night	61% 3 11% 17% 7% 1	97210
Seeing	Day	25% 13% 27% 22% 10% 3	16105
	Night	24% 11% 25% 29% 10% 1	23876

By Month

Percentage Cloud Cover NE (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	12% 14% 6% 15% 13% 14% 7% 4 4 3 8%	2207
	11th to 20th	Day	10% 10% 5% 15% 19% 12% 7% 5% 5% 4 8%	2334
	21st to end	Day	5% 8% 4 14% 8% 10% 9% 6% 8% 7% 21%	2772
February	1st to 10th	Day	7% 14% 4 9% 10% 10% 10% 6% 7% 5% 19%	1662
	11th to 20th	Day	9% 16% 6% 13% 9% 8% 7% 6% 5% 4 17%	1663
	21st to end	Day	8% 13% 5% 12% 9% 9% 7% 3 5% 8% 21%	1523
March	1st to 10th	Day	13% 12% 5% 10% 7% 7% 7% 5% 5% 7% 22%	3197
	11th to 20th	Day	18% 20% 5% 9% 6% 5% 6% 4 4 5% 17%	3480
	21st to end	Day	19% 16% 6% 10% 6% 5% 3 3 4 5% 25%	3816
April	1st to 10th	Day	18% 14% 5% 9% 6% 6% 5% 4 4 6% 24%	2304
	11th to 20th	Day	14% 13% 3 9% 6% 4 4 3 5% 6% 31%	2442
	21st to end	Day	20% 13% 4 9% 5% 4 3 3 4 5% 29%	2470
May	1st to 10th	Day	18% 15% 4 10% 6% 4 4 4 4 5% 24%	4127
	11th to 20th	Day	17% 10% 3 8% 5% 5% 5% 4 6% 6% 30%	4569
	21st to end	Day	19% 9% 4 9% 5% 5% 4 4 5% 7% 29%	5185
June	1st to 10th	Day	22% 10% 3 7% 6% 5% 4 3 4 6% 30%	2850
	11th to 20th	Day	20% 7% 2 6% 5% 4 4 4 6% 7% 33%	2850
	21st to end	Day	22% 9% 4 7% 5% 6% 5% 4 7% 7% 25%	2850
July	1st to 10th	Day	15% 8% 3 9% 6% 6% 5% 4 6% 7% 31%	4760
	11th to 20th	Day	14% 7% 3 7% 5% 6% 6% 5% 6% 8% 33%	4760
	21st to end	Day	12% 6% 2 6% 4 6% 6% 5% 7% 9% 38%	4956
August	1st to 10th	Day	14% 7% 3 8% 5% 5% 5% 5% 6% 8% 34%	4176
	11th to 20th	Day	16% 8% 3 9% 6% 6% 6% 5% 6% 8% 27%	4045
	21st to end	Day	16% 7% 3 7% 5% 4 5% 4 6% 8% 36%	4532
September	1st to 10th	Day	18% 7% 3 7% 5% 4 4 4 5% 6% 36%	2308
	11th to 20th	Day	19% 7% 2 5% 4 4 3 3 4 6% 43%	2090
	21st to end	Day	17% 10% 3 7% 4 5% 4 3 5% 7% 34%	2090
October	1st to 10th	Day	17% 10% 3 8% 6% 4 3 4 5% 5% 34%	1956
	11th to 20th	Day	22% 12% 4 9% 4 5% 4 4 6% 6% 26%	1879
	21st to end	Day	22% 17% 5% 8% 5% 4 4 4 4 5% 23%	1881
November	1st to 10th	Day	16% 16% 5% 11% 6% 6% 4 4 5% 5% 22%	1576
	11th to 20th	Day	17% 15% 6% 14% 6% 6% 5% 2 5% 6% 18%	1520
	21st to end	Day	17% 16% 5% 15% 11% 5% 4 4 4 5% 14%	1463
December	1st to 10th	Day	17% 13% 5% 17% 13% 7% 5% 4 5% 5% 10%	1330
	11th to 20th	Day	15% 15% 6% 16% 10% 7% 5% 4 4 4 14%	1668
	21st to end	Day	14% 16% 5% 16% 11% 6% 5% 3 4 4 17%	2431
January	1st to 10th	Night	8% 14% 6% 16% 15% 14% 6% 5% 6% 5% 6%	4748
	11th to 20th	Night	11% 14% 5% 14% 14% 9% 6% 4 5% 5% 13%	4629
	21st to end	Night	5% 11% 5% 13% 8% 7% 8% 6% 6% 6% 24%	4884
February	1st to 10th	Night	7% 14% 6% 10% 9% 9% 7% 5% 7% 6% 20%	2517
	11th to 20th	Night	11% 14% 5% 11% 8% 8% 7% 6% 6% 5% 19%	2403
	21st to end	Night	9% 13% 4 10% 7% 10% 6% 4 6% 6% 24%	1927
March	1st to 10th	Night	11% 12% 4 8% 7% 6% 8% 4 4 5% 30%	3643
	11th to 20th	Night	20% 19% 5% 11% 7% 4 5% 3 4 4 19%	3479
	21st to end	Night	21% 15% 4 9% 8% 5% 4 3 3 4 24%	3816
April	1st to 10th	Night	18% 14% 4 9% 6% 5% 5% 4 4 5% 26%	1873
	11th to 20th	Night	19% 10% 3 6% 4 4 4 4 6% 6% 34%	1688
	21st to end	Night	21% 11% 3 6% 3 3 3 4 6% 5% 35%	1710
May	1st to 10th	Night	16% 12% 3 8% 5% 4 5% 4 6% 7% 29%	2813
	11th to 20th	Night	17% 8% 3 8% 5% 5% 5% 5% 6% 7% 31%	2362
	21st to end	Night	14% 8% 4 9% 5% 6% 6% 5% 8% 9% 27%	2401
June	1st to 10th	Night	20% 9% 3 8% 5% 5% 4 4 6% 6% 32%	1330
	11th to 20th	Night	18% 7% 2 5% 4 3 5% 4 7% 7% 37%	1330
	21st to end	Night	21% 7% 3 9% 5% 5% 5% 4 4 5% 30%	1330
July	1st to 10th	Night	13% 7% 3 7% 5% 5% 5% 5% 7% 7% 36%	2210
	11th to 20th	Night	13% 6% 2 8% 5% 5% 4 4 6% 9% 36%	2210
	21st to end	Night	11% 6% 2 5% 4 4 4 4 6% 8% 45%	2598
August	1st to 10th	Night	15% 6% 3 8% 5% 5% 5% 4 7% 8% 33%	2721
	11th to 20th	Night	12% 8% 3 9% 5% 6% 6% 5% 7% 8% 31%	2782
	21st to end	Night	16% 6% 3 6% 4 4 5% 3 5% 6% 42%	3124
September	1st to 10th	Night	17% 7% 2 6% 4 5% 5% 3 5% 7% 41%	1869
	11th to 20th	Night	16% 7% 2 6% 5% 5% 5% 3 5% 6% 41%	2090
	21st to end	Night	16% 6% 3 5% 4 5% 4 3 4 5% 44%	2090
October	1st to 10th	Night	19% 7% 2 7% 4 4 4 3 4 6% 39%	2223
	11th to 20th	Night	21% 11% 3 7% 5% 5% 5% 4 5% 6% 28%	2299
	21st to end	Night	20% 13% 3 8% 4 5% 4 4 6% 7% 26%	2717
November	1st to 10th	Night	19% 12% 4 9% 5% 5% 5% 4 5% 6% 26%	2524
	11th to 20th	Night	17% 15% 4 12% 5% 5% 6% 4 4 6% 22%	2660
	21st to end	Night	17% 15% 5% 15% 8% 7% 5% 4 6% 4 15%	2714
December	1st to 10th	Night	18% 16% 5% 13% 9% 7% 7% 5% 5% 3 11%	2850
	11th to 20th	Night	19% 14% 4 13% 12% 9% 6% 4 4 4 11%	3531
	21st to end	Night	14% 13% 5% 13% 12% 8% 5% 4 5% 6% 15%	5236

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	85% 1 7% 6% 1	2208
	11th to 20th	Day	81% 2 5% 8% 3	2334
	21st to end	Day	62% 3 7% 18% 10%	2772
February	1st to 10th	Day	66% 3 9% 15% 6% 1	1662
	11th to 20th	Day	71% 3 8% 13% 4	1671
	21st to end	Day	66% 2 6% 19% 7% 1	1523
March	1st to 10th	Day	63% 2 11% 18% 6% 1	3201
	11th to 20th	Day	72% 3 6% 14% 5% 1	3480
	21st to end	Day	65% 1 7% 18% 8% 2	3816
April	1st to 10th	Day	64% 1 8% 16% 9% 2	2304
	11th to 20th	Day	55% 2 8% 23% 11% 1	2442
	21st to end	Day	59% 2 7% 19% 12% 2	2470
May	1st to 10th	Day	64% 1 7% 18% 9% 1	4141
	11th to 20th	Day	56% 2 12% 19% 10% 1	4573
	21st to end	Day	57% 2 7% 22% 11% 1	5185
June	1st to 10th	Day	57% 3 8% 18% 11% 2	2850
	11th to 20th	Day	49% 4 13% 19% 13% 2	2850
	21st to end	Day	57% 4 12% 17% 9%	2850
July	1st to 10th	Day	52% 4 13% 22% 9%	4685
	11th to 20th	Day	48% 6% 17% 22% 6%	4679
	21st to end	Day	41% 6% 20% 25% 8%	4798
August	1st to 10th	Day	48% 5% 18% 22% 6%	4162
	11th to 20th	Day	52% 7% 20% 16% 5%	4084
	21st to end	Day	46% 5% 17% 22% 10%	4532
September	1st to 10th	Day	49% 3 14% 24% 9%	2308
	11th to 20th	Day	45% 3 15% 27% 9%	2090
	21st to end	Day	51% 3 11% 25% 9%	2090
October	1st to 10th	Day	52% 3 15% 19% 9% 1	1956
	11th to 20th	Day	61% 3 15% 16% 5%	1879
	21st to end	Day	65% 3 9% 17% 5%	1881
November	1st to 10th	Day	67% 2 11% 14% 6%	1576
	11th to 20th	Day	71% 3 10% 12% 3	1520
	21st to end	Day	77% 2 10% 9% 2	1463
December	1st to 10th	Day	80% 3 10% 6% 2	1330
	11th to 20th	Day	77% 2 6% 11% 4	1668
	21st to end	Day	76% 2 8% 8% 6%	2431
January	1st to 10th	Night	83% 2 7% 7% 1	4748
	11th to 20th	Night	77% 2 5% 10% 6%	4629
	21st to end	Night	61% 2 8% 17% 11% 1	4884
February	1st to 10th	Night	64% 4 7% 16% 8% 1	2517
	11th to 20th	Night	67% 3 10% 13% 6%	2406
	21st to end	Night	62% 3 9% 18% 8% 1	1927
March	1st to 10th	Night	59% 1 12% 19% 9%	3652
	11th to 20th	Night	72% 2 7% 13% 5% 1	3480
	21st to end	Night	67% 1 7% 15% 8% 1	3816
April	1st to 10th	Night	63% 2 7% 14% 13% 2	1873
	11th to 20th	Night	52% 2 8% 22% 15% 1	1688
	21st to end	Night	52% 2 8% 23% 15% 1	1710
May	1st to 10th	Night	55% 1 14% 16% 13% 1	2819
	11th to 20th	Night	53% 2 12% 24% 9%	2363
	21st to end	Night	53% 4 9% 25% 8% 1	2402
June	1st to 10th	Night	52% 3 11% 21% 11% 1	1330
	11th to 20th	Night	44% 5% 13% 22% 15% 1	1330
	21st to end	Night	56% 4 11% 18% 11%	1330
July	1st to 10th	Night	46% 6% 14% 26% 8%	2175
	11th to 20th	Night	45% 6% 22% 22% 5%	2168
	21st to end	Night	37% 7% 23% 22% 11%	2515
August	1st to 10th	Night	48% 6% 19% 21% 5%	2711
	11th to 20th	Night	49% 9% 22% 15% 5%	2809
	21st to end	Night	43% 6% 14% 24% 13%	3124
September	1st to 10th	Night	46% 2 13% 29% 10%	1869
	11th to 20th	Night	46% 3 16% 25% 10%	2090
	21st to end	Night	44% 4 12% 25% 14% 1	2090
October	1st to 10th	Night	48% 3 14% 25% 9% 1	2223
	11th to 20th	Night	58% 3 13% 20% 5%	2299
	21st to end	Night	60% 3 14% 17% 5% 1	2717
November	1st to 10th	Night	62% 2 14% 15% 6%	2524
	11th to 20th	Night	68% 3 11% 14% 5%	2660
	21st to end	Night	75% 4 9% 8% 3 1	2714
December	1st to 10th	Night	80% 2 8% 8% 2	2850
	11th to 20th	Night	80% 2 5% 9% 3	3532
	21st to end	Night	74% 1 10% 10% 5% 1	5236

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	25% 19% 29% 21% 4 2	180
	11th to 20th	Day	23% 22% 31% 14% 8% 1	180
	21st to end	Day	14% 22% 32% 23% 6% 4	198
February	1st to 10th	Day	23% 16% 31% 20% 7% 2	322
	11th to 20th	Day	18% 23% 34% 19% 6% 1	366
	21st to end	Day	21% 20% 32% 18% 8% 1	360
March	1st to 10th	Day	21% 17% 32% 22% 7% 1	460
	11th to 20th	Day	27% 16% 25% 21% 9% 1	460
	21st to end	Day	28% 16% 26% 18% 9% 3	506
April	1st to 10th	Day	29% 19% 25% 17% 8% 1	460
	11th to 20th	Day	27% 13% 32% 19% 8% 2	452
	21st to end	Day	33% 13% 24% 22% 6% 2	460
May	1st to 10th	Day	34% 12% 27% 20% 6% 2	471
	11th to 20th	Day	27% 11% 25% 23% 11% 2	674
	21st to end	Day	31% 16% 24% 19% 9% 2	735
June	1st to 10th	Day	29% 12% 24% 24% 10% 2	680
	11th to 20th	Day	25% 12% 25% 22% 13% 3	680
	21st to end	Day	25% 8% 26% 27% 10% 3	680
July	1st to 10th	Day	21% 6% 29% 27% 13% 4	670
	11th to 20th	Day	17% 8% 29% 30% 13% 3	668
	21st to end	Day	18% 8% 27% 31% 13% 3	622
August	1st to 10th	Day	19% 9% 29% 26% 13% 4	486
	11th to 20th	Day	18% 8% 29% 29% 14% 3	479
	21st to end	Day	23% 9% 27% 22% 14% 5%	539
September	1st to 10th	Day	23% 12% 28% 21% 11% 5%	490
	11th to 20th	Day	24% 9% 29% 22% 11% 5%	490
	21st to end	Day	26% 13% 25% 18% 13% 4	490
October	1st to 10th	Day	22% 12% 28% 21% 13% 4	419
	11th to 20th	Day	36% 10% 21% 20% 9% 4	390
	21st to end	Day	34% 17% 21% 18% 10% 1	429
November	1st to 10th	Day	31% 14% 28% 19% 6% 2	368
	11th to 20th	Day	28% 15% 29% 20% 9% 1	370
	21st to end	Day	32% 21% 23% 18% 5% 1	313
December	1st to 10th	Day	23% 13% 36% 15% 8% 5%	180
	11th to 20th	Day	24% 28% 28% 16% 4	180
	21st to end	Day	27% 23% 31% 14% 6%	198
January	1st to 10th	Night	22% 12% 31% 28% 6% 1	850
	11th to 20th	Night	23% 15% 29% 27% 5%	812
	21st to end	Night	16% 16% 30% 28% 10% 1	836
February	1st to 10th	Night	17% 15% 30% 28% 8% 1	760
	11th to 20th	Night	23% 12% 33% 23% 9%	743
	21st to end	Night	18% 11% 33% 28% 9% 1	628
March	1st to 10th	Night	21% 10% 30% 30% 7% 1	760
	11th to 20th	Night	26% 13% 28% 22% 10% 1	760
	21st to end	Night	24% 11% 25% 28% 10% 1	836
April	1st to 10th	Night	28% 14% 25% 25% 7%	683
	11th to 20th	Night	26% 10% 24% 29% 9% 1	564
	21st to end	Night	28% 12% 25% 25% 8% 1	570
May	1st to 10th	Night	28% 9% 24% 31% 8% 1	570
	11th to 20th	Night	23% 8% 26% 30% 12% 1	483
	21st to end	Night	21% 8% 28% 33% 10%	411
June	1st to 10th	Night	22% 6% 19% 41% 11% 1	380
	11th to 20th	Night	21% 4 23% 35% 16% 1	380
	21st to end	Night	22% 5% 25% 34% 12% 1	380
July	1st to 10th	Night	20% 4 24% 36% 15% 1	370
	11th to 20th	Night	18% 3 21% 42% 16%	368
	21st to end	Night	17% 6% 17% 39% 21% 1	416
August	1st to 10th	Night	17% 3 20% 39% 20% 1	502
	11th to 20th	Night	19% 4 16% 39% 21% 1	562
	21st to end	Night	19% 4 20% 37% 18% 3	627
September	1st to 10th	Night	22% 5% 27% 33% 11% 2	620
	11th to 20th	Night	21% 7% 21% 34% 16% 2	760
	21st to end	Night	21% 7% 26% 32% 13% 1	760
October	1st to 10th	Night	23% 11% 24% 29% 12% 1	760
	11th to 20th	Night	29% 8% 24% 25% 12% 1	760
	21st to end	Night	29% 14% 23% 24% 8% 1	836
November	1st to 10th	Night	31% 12% 23% 26% 7% 1	794
	11th to 20th	Night	29% 15% 26% 23% 6% 1	850
	21st to end	Night	29% 13% 26% 24% 7% 1	850
December	1st to 10th	Night	29% 12% 27% 24% 7% 1	850
	11th to 20th	Night	28% 18% 25% 22% 7%	850
	21st to end	Night	27% 17% 24% 24% 7% 2	935

Page generated at 2024-10-30 01:22:53. Version ac07

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