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 2024-09-29.

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% 4 9% 5% 5% 5% 4 6% 7% 33%	101527
	Night	12% 12% 5% 10% 6% 5% 5% 4 5% 6% 30%	96870
Transparency	Day	49% 7% 14% 22% 8%	101266
	Night	53% 6% 13% 19% 7%	96749
Seeing	Day	18% 14% 34% 23% 9% 2	16117
	Night	18% 11% 33% 27% 10% 1	25961

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% 13% 7% 16% 7% 8% 6% 4 6% 5% 20%	2218
	11th to 20th	Day	5% 11% 6% 13% 12% 11% 10% 7% 7% 5% 14%	2220
	21st to end	Day	8% 17% 10% 19% 7% 6% 6% 5% 6% 4 13%	2796
February	1st to 10th	Day	7% 13% 6% 12% 7% 6% 9% 5% 8% 7% 21%	1710
	11th to 20th	Day	7% 12% 5% 11% 8% 7% 6% 5% 5% 6% 30%	1664
	21st to end	Day	7% 11% 5% 14% 7% 6% 6% 4 6% 6% 28%	1413
March	1st to 10th	Day	9% 12% 3 8% 6% 5% 5% 4 6% 7% 36%	3304
	11th to 20th	Day	6% 10% 5% 15% 9% 5% 4 3 5% 7% 29%	3480
	21st to end	Day	13% 15% 6% 8% 6% 4 3 3 4 5% 33%	3863
April	1st to 10th	Day	14% 12% 3 7% 5% 4 4 4 6% 7% 35%	2280
	11th to 20th	Day	14% 13% 3 7% 4 4 4 4 6% 7% 33%	2392
	21st to end	Day	16% 12% 3 8% 5% 4 5% 3 5% 7% 33%	2479
May	1st to 10th	Day	17% 11% 3 6% 4 4 4 4 5% 7% 34%	4428
	11th to 20th	Day	16% 9% 3 8% 6% 4 5% 3 6% 6% 33%	4399
	21st to end	Day	21% 10% 3 6% 4 3 3 3 5% 5% 38%	5015
June	1st to 10th	Day	13% 6% 3 7% 5% 5% 5% 4 7% 8% 37%	2850
	11th to 20th	Day	15% 6% 3 7% 6% 5% 5% 4 6% 7% 36%	2850
	21st to end	Day	16% 7% 2 7% 5% 5% 5% 5% 8% 9% 32%	2850
July	1st to 10th	Day	9% 5% 2 6% 5% 5% 6% 4 8% 10% 41%	4750
	11th to 20th	Day	10% 5% 1 4 4 3 4 4 6% 10% 48%	4750
	21st to end	Day	14% 6% 2 6% 4 4 5% 4 6% 8% 41%	4981
August	1st to 10th	Day	11% 7% 2 6% 4 5% 5% 5% 6% 8% 39%	4297
	11th to 20th	Day	12% 5% 2 5% 4 4 4 4 6% 9% 46%	4041
	21st to end	Day	15% 7% 2 6% 4 4 4 4 6% 8% 40%	4482
September	1st to 10th	Day	14% 6% 2 6% 4 4 4 4 5% 8% 43%	2280
	11th to 20th	Day	16% 7% 3 7% 4 4 5% 4 6% 8% 36%	2231
	21st to end	Day	21% 7% 3 7% 4 3 4 3 4 7% 37%	1994
October	1st to 10th	Day	19% 15% 4 9% 5% 4 4 3 5% 5% 28%	1800
	11th to 20th	Day	19% 17% 4 9% 5% 4 4 3 5% 4 25%	1800
	21st to end	Day	21% 20% 5% 10% 5% 4 4 2 4 5% 21%	1818
November	1st to 10th	Day	16% 18% 6% 11% 6% 5% 4 3 4 4 22%	1487
	11th to 20th	Day	13% 19% 7% 19% 8% 6% 3 2 4 3 16%	1520
	21st to end	Day	12% 17% 8% 16% 9% 6% 5% 3 4 4 16%	1520
December	1st to 10th	Day	9% 15% 6% 19% 11% 8% 7% 4 4 5% 13%	1444
	11th to 20th	Day	10% 20% 7% 12% 8% 6% 7% 3 4 5% 19%	1679
	21st to end	Day	16% 17% 7% 14% 8% 5% 5% 3 5% 4 16%	2442
January	1st to 10th	Night	5% 14% 6% 15% 10% 6% 6% 5% 6% 5% 20%	4737
	11th to 20th	Night	6% 11% 5% 14% 13% 13% 10% 5% 6% 4 13%	4750
	21st to end	Night	9% 20% 11% 15% 7% 5% 5% 3 5% 4 15%	4866
February	1st to 10th	Night	7% 12% 5% 11% 8% 7% 7% 6% 7% 6% 23%	2470
	11th to 20th	Night	8% 10% 4 10% 6% 6% 5% 5% 6% 6% 33%	2403
	21st to end	Night	6% 13% 6% 12% 8% 6% 7% 4 6% 7% 26%	2041
March	1st to 10th	Night	12% 12% 4 10% 5% 5% 5% 4 5% 7% 32%	3565
	11th to 20th	Night	7% 12% 4 10% 9% 8% 5% 4 6% 7% 30%	3479
	21st to end	Night	16% 16% 5% 8% 5% 4 3 3 4 5% 31%	3768
April	1st to 10th	Night	15% 11% 4 7% 5% 4 4 4 5% 5% 36%	1900
	11th to 20th	Night	15% 12% 5% 7% 4 4 3 2 5% 6% 36%	1736
	21st to end	Night	15% 11% 4 8% 5% 5% 5% 4 5% 5% 33%	1700
May	1st to 10th	Night	19% 9% 3 5% 4 4 4 3 5% 7% 37%	2523
	11th to 20th	Night	16% 7% 3 6% 5% 4 5% 4 7% 7% 37%	2506
	21st to end	Night	22% 7% 2 6% 3 3 4 3 5% 6% 39%	2569
June	1st to 10th	Night	15% 5% 2 6% 4 4 5% 4 5% 8% 40%	1330
	11th to 20th	Night	14% 6% 4 5% 4 4 4 5% 5% 6% 43%	1330
	21st to end	Night	15% 5% 2 6% 3 3 4 4 6% 9% 43%	1330
July	1st to 10th	Night	10% 4 1 4 4 4 4 4 7% 10% 48%	2220
	11th to 20th	Night	7% 4 1 4 3 3 4 5% 7% 11% 52%	2220
	21st to end	Night	9% 5% 2 6% 4 3 4 3 5% 8% 52%	2583
August	1st to 10th	Night	9% 5% 2 6% 5% 4 6% 4 6% 9% 45%	2639
	11th to 20th	Night	11% 6% 2 5% 3 3 3 3 6% 9% 49%	2798
	21st to end	Night	14% 6% 2 5% 3 4 4 3 5% 8% 46%	3183
September	1st to 10th	Night	12% 6% 2 7% 5% 3 4 3 4 7% 48%	1900
	11th to 20th	Night	16% 7% 2 6% 4 4 4 2 5% 7% 44%	1947
	21st to end	Night	19% 8% 3 7% 3 3 4 4 5% 6% 39%	2135
October	1st to 10th	Night	16% 13% 4 7% 5% 4 5% 4 5% 6% 32%	2160
	11th to 20th	Night	18% 16% 4 9% 4 4 3 3 4 6% 30%	2160
	21st to end	Night	20% 16% 4 10% 6% 4 4 4 5% 5% 23%	2536
November	1st to 10th	Night	15% 19% 7% 11% 5% 4 4 2 4 5% 23%	2591
	11th to 20th	Night	13% 17% 6% 18% 8% 4 4 3 4 4 17%	2660
	21st to end	Night	13% 17% 7% 14% 10% 6% 4 3 4 5% 18%	2660
December	1st to 10th	Night	8% 14% 6% 19% 12% 9% 6% 4 3 5% 14%	2732
	11th to 20th	Night	10% 15% 6% 15% 9% 7% 6% 5% 6% 5% 16%	3518
	21st to end	Night	16% 16% 7% 15% 10% 5% 5% 4 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	60% 5% 11% 14% 8% 1	1710
	11th to 20th	Day	53% 6% 11% 20% 8% 1	1673
	21st to end	Day	54% 6% 12% 16% 11% 1	1413
March	1st to 10th	Day	46% 6% 14% 18% 16%	3306
	11th to 20th	Day	54% 6% 13% 19% 8%	3480
	21st to end	Day	53% 6% 8% 22% 10% 1	3863
April	1st to 10th	Day	48% 5% 9% 22% 15% 1	2280
	11th to 20th	Day	49% 6% 12% 20% 13% 1	2392
	21st to end	Day	51% 5% 10% 23% 10% 1	2479
May	1st to 10th	Day	46% 7% 12% 23% 10% 1	4440
	11th to 20th	Day	48% 8% 13% 18% 12% 1	4403
	21st to end	Day	48% 5% 10% 25% 11% 1	5015
June	1st to 10th	Day	43% 8% 16% 21% 12% 1	2850
	11th to 20th	Day	45% 8% 13% 22% 11%	2850
	21st to end	Day	46% 9% 17% 21% 7%	2850
July	1st to 10th	Day	35% 9% 21% 28% 7%	4676
	11th to 20th	Day	29% 7% 20% 36% 7%	4669
	21st to end	Day	41% 7% 15% 32% 5%	4823
August	1st to 10th	Day	40% 7% 16% 24% 12% 1	4282
	11th to 20th	Day	34% 7% 26% 27% 5%	4080
	21st to end	Day	41% 6% 21% 27% 5%	4481
September	1st to 10th	Day	38% 8% 15% 30% 8%	2280
	11th to 20th	Day	45% 8% 20% 22% 4	2231
	21st to end	Day	48% 6% 14% 27% 5%	1994
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	57% 7% 12% 14% 8% 1	2470
	11th to 20th	Night	50% 6% 14% 20% 9% 1	2404
	21st to end	Night	56% 6% 12% 17% 8%	2041
March	1st to 10th	Night	49% 6% 13% 19% 13% 1	3576
	11th to 20th	Night	51% 8% 15% 18% 8% 1	3480
	21st to end	Night	55% 5% 8% 18% 12% 1	3768
April	1st to 10th	Night	47% 6% 9% 19% 17% 1	1900
	11th to 20th	Night	49% 4 9% 21% 15% 2	1736
	21st to end	Night	51% 6% 9% 20% 12% 1	1700
May	1st to 10th	Night	45% 5% 9% 25% 15% 1	2530
	11th to 20th	Night	43% 8% 14% 22% 12% 1	2507
	21st to end	Night	45% 7% 12% 23% 11% 1	2570
June	1st to 10th	Night	41% 8% 16% 22% 13% 1	1330
	11th to 20th	Night	39% 8% 11% 26% 15% 1	1330
	21st to end	Night	38% 8% 18% 26% 9% 1	1330
July	1st to 10th	Night	29% 11% 24% 26% 9% 1	2185
	11th to 20th	Night	25% 7% 19% 38% 10%	2178
	21st to end	Night	31% 7% 15% 38% 8% 1	2501
August	1st to 10th	Night	36% 5% 17% 32% 9% 1	2630
	11th to 20th	Night	32% 7% 23% 33% 6%	2825
	21st to end	Night	38% 6% 21% 28% 7%	3183
September	1st to 10th	Night	37% 6% 16% 30% 11%	1900
	11th to 20th	Night	40% 7% 19% 26% 7%	1947
	21st to end	Night	45% 6% 14% 29% 5%	2135
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% 44% 20% 5% 1	270
	11th to 20th	Day	13% 23% 36% 19% 7% 3	270
	21st to end	Day	17% 21% 41% 15% 4 1	225
March	1st to 10th	Day	15% 17% 39% 20% 9% 1	270
	11th to 20th	Day	14% 22% 33% 20% 9% 1	270
	21st to end	Day	16% 18% 39% 21% 6% 1	321
April	1st to 10th	Day	22% 16% 32% 24% 7%	460
	11th to 20th	Day	24% 18% 29% 23% 5% 1	590
	21st to end	Day	20% 15% 34% 22% 8% 1	650
May	1st to 10th	Day	23% 16% 37% 17% 5% 2	653
	11th to 20th	Day	19% 17% 34% 19% 9% 2	675
	21st to end	Day	22% 14% 34% 23% 6% 1	734
June	1st to 10th	Day	17% 15% 34% 22% 8% 3	680
	11th to 20th	Day	17% 17% 37% 19% 8% 2	680
	21st to end	Day	17% 11% 34% 25% 10% 3	680
July	1st to 10th	Day	11% 11% 31% 27% 15% 5%	671
	11th to 20th	Day	15% 11% 29% 28% 13% 5%	668
	21st to end	Day	11% 11% 32% 26% 15% 5%	739
August	1st to 10th	Day	12% 9% 33% 30% 14% 3	676
	11th to 20th	Day	13% 7% 30% 28% 15% 6%	665
	21st to end	Day	18% 9% 31% 27% 13% 2	724
September	1st to 10th	Day	15% 11% 33% 29% 10% 1	490
	11th to 20th	Day	20% 15% 34% 23% 8% 1	441
	21st to end	Day	27% 16% 31% 20% 6%	294
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	13% 11% 36% 31% 8% 1	950
	11th to 20th	Night	14% 13% 35% 25% 11% 2	929
	21st to end	Night	12% 12% 40% 23% 11% 3	785
March	1st to 10th	Night	14% 15% 35% 25% 10% 1	670
	11th to 20th	Night	14% 13% 39% 25% 7% 1	570
	21st to end	Night	20% 10% 32% 23% 12% 3	627
April	1st to 10th	Night	20% 11% 31% 28% 8% 1	570
	11th to 20th	Night	22% 11% 31% 25% 9%	563
	21st to end	Night	20% 12% 29% 29% 11%	570
May	1st to 10th	Night	23% 10% 30% 29% 6% 1	570
	11th to 20th	Night	20% 11% 35% 22% 10% 2	561
	21st to end	Night	20% 8% 29% 32% 10%	617
June	1st to 10th	Night	17% 9% 30% 30% 13% 1	570
	11th to 20th	Night	18% 9% 31% 29% 12% 1	570
	21st to end	Night	17% 5% 25% 34% 18% 1	570
July	1st to 10th	Night	9% 5% 27% 38% 20% 1	555
	11th to 20th	Night	12% 8% 25% 36% 18% 1	552
	21st to end	Night	9% 5% 25% 37% 22% 3	624
August	1st to 10th	Night	9% 6% 28% 39% 18% 2	567
	11th to 20th	Night	13% 4 23% 35% 21% 4	564
	21st to end	Night	17% 6% 27% 31% 19% 1	627
September	1st to 10th	Night	15% 6% 31% 32% 15% 1	570
	11th to 20th	Night	19% 10% 28% 30% 12% 1	570
	21st to end	Night	22% 13% 29% 24% 12% 1	623
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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