Nestor Falls
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Nestor Falls clear sky chart from 2005-11-06 to 2024-02-05.

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	13% 10% 5% 8% 7% 4 5% 5% 5% 7% 31%	77796
	Night	12% 11% 5% 9% 8% 4 5% 5% 5% 6% 29%	81102
Transparency	Day	52% 7% 13% 20% 8% 1	77485
	Night	55% 6% 12% 18% 7% 1	80947
Seeing	Day	18% 14% 34% 23% 9% 2	15095
	Night	18% 11% 33% 27% 10% 1	25193

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	7% 12% 8% 14% 9% 6% 6% 6% 6% 5% 21%	2218
	11th to 20th	Day	5% 10% 6% 11% 13% 9% 9% 10% 6% 6% 15%	2220
	21st to end	Day	8% 16% 11% 17% 8% 4 6% 6% 5% 5% 13%	2796
February	1st to 10th	Day	7% 11% 6% 10% 8% 5% 9% 6% 8% 7% 22%	1656
	11th to 20th	Day	7% 10% 6% 8% 9% 6% 6% 6% 5% 6% 30%	1574
	21st to end	Day	7% 10% 6% 13% 8% 5% 6% 6% 6% 6% 27%	1332
March	1st to 10th	Day	9% 13% 5% 8% 6% 4 6% 6% 6% 6% 31%	1897
	11th to 20th	Day	9% 13% 5% 10% 8% 4 4 4 5% 6% 31%	1980
	21st to end	Day	14% 11% 5% 6% 7% 3 3 5% 5% 7% 34%	2200
April	1st to 10th	Day	15% 11% 3 6% 5% 3 4 5% 6% 7% 35%	2160
	11th to 20th	Day	14% 12% 4 6% 5% 3 4 5% 6% 7% 34%	2264
	21st to end	Day	16% 11% 3 7% 6% 3 5% 4 4 7% 34%	2348
May	1st to 10th	Day	17% 11% 3 6% 6% 3 3 4 5% 7% 36%	2520
	11th to 20th	Day	16% 9% 4 7% 6% 3 5% 5% 6% 7% 34%	2479
	21st to end	Day	19% 8% 3 5% 5% 3 4 4 5% 6% 39%	2825
June	1st to 10th	Day	14% 6% 4 6% 6% 4 5% 5% 7% 8% 37%	2700
	11th to 20th	Day	15% 6% 3 6% 6% 3 5% 5% 5% 7% 37%	2700
	21st to end	Day	16% 6% 3 7% 5% 3 5% 6% 7% 9% 32%	2700
July	1st to 10th	Day	8% 4 2 5% 5% 3 5% 6% 7% 9% 45%	2700
	11th to 20th	Day	13% 6% 2 5% 6% 3 4 6% 7% 9% 40%	2700
	21st to end	Day	11% 5% 3 5% 5% 3 5% 4 6% 9% 44%	2845
August	1st to 10th	Day	10% 6% 2 5% 5% 4 4 6% 6% 8% 43%	2437
	11th to 20th	Day	12% 5% 2 4 5% 3 5% 5% 5% 9% 44%	2301
	21st to end	Day	13% 7% 3 5% 4 3 5% 5% 6% 7% 43%	2552
September	1st to 10th	Day	14% 6% 3 5% 5% 3 4 5% 5% 8% 43%	2160
	11th to 20th	Day	16% 7% 3 6% 5% 3 5% 5% 6% 8% 37%	2114
	21st to end	Day	22% 7% 3 5% 5% 2 4 4 4 7% 36%	1908
October	1st to 10th	Day	19% 15% 4 8% 6% 2 4 4 5% 5% 28%	1800
	11th to 20th	Day	19% 16% 5% 8% 6% 3 4 4 5% 4 25%	1800
	21st to end	Day	22% 19% 5% 8% 6% 2 4 3 4 5% 21%	1818
November	1st to 10th	Day	16% 16% 9% 9% 7% 3 4 4 4 5% 22%	1487
	11th to 20th	Day	13% 17% 8% 18% 9% 4 4 3 4 4 16%	1520
	21st to end	Day	13% 16% 8% 13% 12% 5% 6% 3 4 4 17%	1520
December	1st to 10th	Day	9% 14% 7% 17% 13% 6% 8% 5% 4 5% 13%	1444
	11th to 20th	Day	10% 18% 8% 11% 9% 4 7% 5% 4 5% 19%	1679
	21st to end	Day	16% 15% 8% 12% 10% 4 5% 4 5% 4 16%	2442
January	1st to 10th	Night	5% 13% 8% 13% 12% 5% 7% 6% 6% 6% 20%	4737
	11th to 20th	Night	7% 10% 5% 12% 15% 10% 10% 8% 6% 4 13%	4750
	21st to end	Night	9% 19% 12% 14% 8% 4 5% 5% 5% 4 15%	4866
February	1st to 10th	Night	6% 11% 6% 10% 9% 5% 8% 8% 6% 7% 24%	2399
	11th to 20th	Night	9% 10% 4 8% 7% 4 6% 6% 7% 6% 34%	2273
	21st to end	Night	7% 12% 7% 11% 8% 5% 7% 5% 6% 7% 26%	1924
March	1st to 10th	Night	9% 13% 5% 10% 7% 3 5% 5% 5% 7% 30%	2064
	11th to 20th	Night	10% 11% 4 7% 5% 4 5% 4 5% 6% 38%	1979
	21st to end	Night	14% 9% 5% 7% 6% 4 4 4 5% 7% 35%	2156
April	1st to 10th	Night	16% 11% 4 6% 7% 3 4 5% 5% 5% 35%	1800
	11th to 20th	Night	15% 12% 4 6% 4 3 4 3 5% 6% 37%	1644
	21st to end	Night	15% 10% 4 8% 6% 4 6% 4 5% 5% 33%	1611
May	1st to 10th	Night	18% 8% 3 6% 6% 3 4 4 6% 7% 36%	1440
	11th to 20th	Night	18% 6% 3 3 6% 3 4 4 6% 8% 38%	1416
	21st to end	Night	17% 6% 2 5% 4 3 4 4 5% 7% 44%	1448
June	1st to 10th	Night	16% 4 3 5% 5% 3 5% 5% 6% 8% 40%	1260
	11th to 20th	Night	13% 6% 4 5% 4 3 4 6% 5% 6% 44%	1260
	21st to end	Night	14% 4 3 5% 4 3 5% 5% 6% 9% 43%	1260
July	1st to 10th	Night	8% 3 2 3 4 3 4 3 6% 9% 55%	1260
	11th to 20th	Night	9% 4 1 4 4 3 5% 6% 7% 10% 46%	1260
	21st to end	Night	7% 3 2 4 3 3 4 4 5% 8% 57%	1473
August	1st to 10th	Night	8% 4 1 4 5% 3 4 4 5% 8% 54%	1498
	11th to 20th	Night	11% 6% 3 4 4 3 4 5% 5% 8% 47%	1600
	21st to end	Night	14% 5% 1 4 3 2 4 4 5% 7% 50%	1804
September	1st to 10th	Night	12% 6% 2 6% 6% 3 4 4 4 7% 47%	1800
	11th to 20th	Night	16% 6% 3 5% 5% 2 4 3 5% 7% 43%	1844
	21st to end	Night	19% 8% 3 6% 4 2 4 4 5% 7% 38%	2034
October	1st to 10th	Night	16% 12% 4 6% 6% 3 5% 5% 5% 6% 32%	2160
	11th to 20th	Night	19% 15% 4 7% 5% 3 4 3 3 6% 30%	2160
	21st to end	Night	20% 15% 5% 9% 7% 3 4 5% 4 5% 23%	2536
November	1st to 10th	Night	15% 17% 8% 10% 7% 3 4 3 4 5% 23%	2591
	11th to 20th	Night	14% 16% 7% 16% 11% 3 5% 4 4 4 17%	2660
	21st to end	Night	13% 16% 7% 12% 11% 4 5% 4 4 5% 18%	2660
December	1st to 10th	Night	8% 13% 7% 16% 14% 7% 7% 5% 3 5% 14%	2732
	11th to 20th	Night	11% 14% 7% 13% 11% 5% 7% 6% 6% 5% 16%	3518
	21st to end	Night	16% 15% 8% 12% 13% 4 5% 5% 4 4 13%	5225

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	64% 6% 9% 15% 6%	2219
	11th to 20th	Day	67% 6% 11% 14% 3	2220
	21st to end	Day	71% 6% 9% 10% 4	2796
February	1st to 10th	Day	58% 6% 12% 14% 9% 1	1656
	11th to 20th	Day	54% 5% 11% 20% 9% 1	1583
	21st to end	Day	56% 5% 11% 17% 10% 1	1332
March	1st to 10th	Day	53% 6% 14% 17% 9% 1	1899
	11th to 20th	Day	54% 6% 13% 17% 10% 1	1980
	21st to end	Day	51% 6% 12% 20% 9% 2	2200
April	1st to 10th	Day	49% 6% 9% 21% 14% 1	2160
	11th to 20th	Day	49% 6% 12% 19% 14% 1	2264
	21st to end	Day	51% 5% 10% 22% 11% 1	2348
May	1st to 10th	Day	49% 6% 10% 22% 12% 1	2520
	11th to 20th	Day	48% 7% 12% 20% 12% 2	2483
	21st to end	Day	46% 6% 12% 20% 14% 1	2825
June	1st to 10th	Day	43% 8% 16% 21% 11% 1	2700
	11th to 20th	Day	45% 8% 13% 22% 12%	2700
	21st to end	Day	45% 10% 17% 22% 6%	2700
July	1st to 10th	Day	32% 9% 16% 31% 11%	2626
	11th to 20th	Day	38% 8% 16% 28% 10%	2619
	21st to end	Day	37% 8% 16% 30% 7% 1	2687
August	1st to 10th	Day	37% 9% 19% 26% 9% 1	2422
	11th to 20th	Day	36% 9% 19% 29% 6%	2301
	21st to end	Day	39% 8% 16% 28% 9%	2552
September	1st to 10th	Day	39% 8% 14% 29% 9%	2160
	11th to 20th	Day	46% 8% 20% 22% 4	2114
	21st to end	Day	49% 6% 15% 26% 4	1908
October	1st to 10th	Day	57% 7% 14% 18% 4	1800
	11th to 20th	Day	61% 4 11% 18% 5%	1800
	21st to end	Day	67% 6% 11% 14% 2	1818
November	1st to 10th	Day	66% 6% 11% 12% 4 1	1487
	11th to 20th	Day	72% 4 10% 9% 4	1520
	21st to end	Day	71% 5% 12% 9% 2	1520
December	1st to 10th	Day	74% 7% 7% 9% 3	1444
	11th to 20th	Day	68% 4 11% 15% 2	1680
	21st to end	Day	69% 5% 8% 14% 4	2442
January	1st to 10th	Night	64% 6% 11% 16% 3	4737
	11th to 20th	Night	71% 6% 9% 12% 3	4750
	21st to end	Night	72% 4 11% 10% 3	4866
February	1st to 10th	Night	56% 7% 13% 15% 9% 1	2399
	11th to 20th	Night	49% 6% 15% 20% 10% 1	2274
	21st to end	Night	56% 6% 12% 17% 8% 1	1924
March	1st to 10th	Night	54% 6% 11% 17% 11% 1	2075
	11th to 20th	Night	47% 6% 12% 22% 14% 1	1980
	21st to end	Night	50% 6% 12% 18% 13% 2	2156
April	1st to 10th	Night	48% 6% 9% 18% 16% 2	1800
	11th to 20th	Night	49% 4 10% 21% 15% 2	1644
	21st to end	Night	51% 7% 9% 20% 12% 1	1611
May	1st to 10th	Night	47% 5% 10% 24% 13% 1	1440
	11th to 20th	Night	43% 7% 12% 21% 15% 2	1417
	21st to end	Night	41% 7% 11% 23% 15% 2	1449
June	1st to 10th	Night	41% 8% 17% 22% 13%	1260
	11th to 20th	Night	39% 8% 11% 26% 16% 1	1260
	21st to end	Night	37% 9% 19% 25% 9% 1	1260
July	1st to 10th	Night	25% 9% 18% 33% 14% 1	1225
	11th to 20th	Night	30% 10% 16% 31% 13%	1218
	21st to end	Night	26% 8% 16% 36% 13% 1	1391
August	1st to 10th	Night	29% 6% 18% 34% 13% 1	1489
	11th to 20th	Night	34% 8% 18% 30% 10%	1600
	21st to end	Night	33% 7% 17% 32% 10%	1804
September	1st to 10th	Night	37% 7% 16% 29% 11%	1800
	11th to 20th	Night	40% 7% 19% 26% 8%	1844
	21st to end	Night	47% 7% 14% 28% 4	2034
October	1st to 10th	Night	52% 7% 12% 22% 6%	2160
	11th to 20th	Night	56% 6% 12% 21% 4	2160
	21st to end	Night	62% 7% 13% 15% 3	2536
November	1st to 10th	Night	64% 6% 11% 13% 4 1	2591
	11th to 20th	Night	71% 6% 9% 10% 4	2660
	21st to end	Night	68% 7% 13% 9% 3	2660
December	1st to 10th	Night	73% 6% 10% 9% 2	2732
	11th to 20th	Night	68% 6% 10% 12% 4	3516
	21st to end	Night	74% 5% 7% 10% 4	5225

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	13% 19% 37% 23% 8%	270
	11th to 20th	Day	15% 12% 42% 25% 5%	270
	21st to end	Day	16% 9% 41% 24% 8% 1	297
February	1st to 10th	Day	16% 13% 45% 19% 7%	252
	11th to 20th	Day	13% 22% 38% 18% 6% 4	240
	21st to end	Day	17% 19% 43% 16% 4 1	198
March	1st to 10th	Day	14% 15% 40% 20% 10% 1	240
	11th to 20th	Day	15% 22% 31% 20% 10% 2	240
	21st to end	Day	16% 18% 38% 21% 7% 1	286
April	1st to 10th	Day	22% 15% 32% 23% 7%	420
	11th to 20th	Day	23% 16% 30% 24% 6% 1	542
	21st to end	Day	20% 16% 33% 23% 8% 1	600
May	1st to 10th	Day	23% 15% 37% 18% 5% 2	603
	11th to 20th	Day	20% 16% 33% 19% 10% 2	625
	21st to end	Day	22% 13% 33% 24% 6% 1	679
June	1st to 10th	Day	17% 14% 34% 23% 8% 3	630
	11th to 20th	Day	16% 17% 37% 20% 8% 2	630
	21st to end	Day	16% 10% 34% 26% 11% 4	630
July	1st to 10th	Day	10% 12% 32% 27% 14% 4	621
	11th to 20th	Day	16% 12% 30% 27% 12% 4	618
	21st to end	Day	11% 11% 32% 26% 15% 6%	684
August	1st to 10th	Day	11% 8% 32% 31% 15% 3	626
	11th to 20th	Day	13% 7% 31% 28% 15% 6%	615
	21st to end	Day	17% 9% 29% 29% 13% 2	671
September	1st to 10th	Day	16% 11% 32% 28% 11% 1	450
	11th to 20th	Day	21% 15% 33% 23% 8% 1	404
	21st to end	Day	28% 16% 30% 19% 6%	270
October	1st to 10th	Day	23% 14% 34% 20% 8%	270
	11th to 20th	Day	22% 20% 35% 19% 3	270
	21st to end	Day	33% 20% 28% 15% 3 1	297
November	1st to 10th	Day	21% 19% 38% 18% 4	270
	11th to 20th	Day	24% 20% 36% 16% 3	270
	21st to end	Day	26% 22% 41% 8% 3	270
December	1st to 10th	Day	20% 13% 37% 24% 4 2	270
	11th to 20th	Day	22% 21% 36% 18% 3	270
	21st to end	Day	20% 12% 41% 19% 7% 1	297
January	1st to 10th	Night	14% 14% 37% 23% 10% 1	950
	11th to 20th	Night	17% 11% 38% 26% 7% 1	950
	21st to end	Night	16% 13% 38% 27% 7% 1	1045
February	1st to 10th	Night	12% 11% 36% 32% 7% 1	923
	11th to 20th	Night	14% 13% 35% 25% 10% 3	879
	21st to end	Night	12% 11% 40% 23% 11% 3	740
March	1st to 10th	Night	14% 15% 35% 25% 10% 1	635
	11th to 20th	Night	14% 12% 39% 25% 8% 1	540
	21st to end	Night	20% 10% 31% 23% 13% 3	594
April	1st to 10th	Night	21% 12% 30% 28% 9% 1	540
	11th to 20th	Night	22% 10% 31% 26% 10%	533
	21st to end	Night	20% 11% 29% 30% 11%	540
May	1st to 10th	Night	23% 10% 30% 30% 7% 1	540
	11th to 20th	Night	20% 10% 35% 22% 11% 2	531
	21st to end	Night	20% 8% 30% 32% 10%	584
June	1st to 10th	Night	18% 8% 30% 30% 13% 1	540
	11th to 20th	Night	18% 8% 31% 29% 13% 1	540
	21st to end	Night	16% 6% 25% 34% 19% 1	540
July	1st to 10th	Night	8% 5% 28% 38% 19% 1	525
	11th to 20th	Night	12% 8% 26% 36% 17% 1	522
	21st to end	Night	9% 4 26% 36% 22% 3	591
August	1st to 10th	Night	9% 6% 28% 38% 18% 2	537
	11th to 20th	Night	13% 5% 24% 34% 20% 4	534
	21st to end	Night	17% 5% 27% 31% 19% 1	594
September	1st to 10th	Night	15% 6% 31% 32% 15% 1	540
	11th to 20th	Night	19% 9% 28% 30% 12% 1	540
	21st to end	Night	23% 12% 30% 23% 11% 1	594
October	1st to 10th	Night	24% 13% 32% 27% 4 1	720
	11th to 20th	Night	28% 12% 29% 24% 7%	720
	21st to end	Night	29% 12% 33% 20% 5%	862
November	1st to 10th	Night	24% 13% 34% 23% 5% 1	925
	11th to 20th	Night	23% 12% 34% 24% 5% 1	950
	21st to end	Night	22% 18% 38% 18% 4	950
December	1st to 10th	Night	16% 13% 37% 25% 8% 1	950
	11th to 20th	Night	18% 14% 38% 23% 6% 1	950
	21st to end	Night	21% 12% 34% 25% 7% 1	1045

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