Camp Kintail
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camp Kintail clear sky chart from 2005-11-06 to 2024-02-15.

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% 12% 5% 8% 6% 3 4 4 5% 6% 30%	78192
	Night	17% 15% 6% 10% 7% 3 4 4 4 5% 25%	80895
Transparency	Day	54% 4 12% 19% 9% 1	77901
	Night	63% 3 10% 15% 8% 1	80720
Seeing	Day	20% 9% 25% 27% 15% 5%	14139
	Night	24% 10% 25% 27% 12% 2	23646

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	18% 26% 11% 18% 8% 3 3 2 2 2 8%	2368
	11th to 20th	Day	11% 21% 12% 23% 17% 3 3 2 2 2 4	2593
	21st to end	Day	19% 21% 11% 16% 9% 4 4 3 3 3 7%	3124
February	1st to 10th	Day	15% 18% 7% 16% 11% 4 4 4 3 5% 13%	1710
	11th to 20th	Day	14% 14% 9% 17% 13% 4 6% 3 3 4 14%	1613
	21st to end	Day	16% 16% 6% 12% 8% 3 5% 4 4 4 21%	1480
March	1st to 10th	Day	14% 12% 7% 12% 8% 3 4 4 4 5% 26%	1895
	11th to 20th	Day	13% 12% 7% 10% 5% 3 5% 5% 5% 5% 30%	1980
	21st to end	Day	18% 10% 5% 7% 7% 2 5% 4 4 6% 32%	2178
April	1st to 10th	Day	18% 13% 5% 7% 5% 3 5% 5% 4 6% 30%	2064
	11th to 20th	Day	17% 9% 4 6% 5% 2 5% 4 5% 7% 35%	2312
	21st to end	Day	18% 9% 4 6% 5% 3 4 4 5% 7% 36%	2340
May	1st to 10th	Day	17% 7% 3 6% 6% 4 5% 4 5% 7% 36%	2340
	11th to 20th	Day	16% 7% 3 5% 5% 3 5% 3 5% 6% 43%	2318
	21st to end	Day	13% 6% 3 5% 4 2 4 4 5% 8% 45%	2725
June	1st to 10th	Day	12% 5% 3 5% 5% 3 5% 5% 7% 8% 41%	2645
	11th to 20th	Day	11% 5% 2 4 5% 4 5% 5% 6% 9% 44%	2700
	21st to end	Day	13% 5% 2 5% 4 3 4 5% 6% 7% 45%	2700
July	1st to 10th	Day	8% 4 2 4 3 3 4 5% 7% 10% 51%	2700
	11th to 20th	Day	10% 5% 2 4 4 3 5% 5% 5% 9% 46%	2554
	21st to end	Day	10% 5% 3 5% 4 3 5% 5% 6% 10% 46%	2547
August	1st to 10th	Day	9% 5% 3 4 5% 3 6% 5% 7% 10% 44%	2327
	11th to 20th	Day	11% 3 3 5% 6% 4 4 5% 6% 9% 44%	2303
	21st to end	Day	11% 6% 2 5% 5% 3 5% 5% 6% 8% 44%	2574
September	1st to 10th	Day	13% 5% 2 6% 5% 4 5% 5% 6% 9% 39%	2092
	11th to 20th	Day	15% 5% 2 5% 6% 2 4 5% 6% 8% 44%	1980
	21st to end	Day	17% 7% 3 6% 5% 4 5% 5% 5% 8% 35%	1980
October	1st to 10th	Day	20% 8% 3 5% 7% 3 4 5% 4 7% 33%	1852
	11th to 20th	Day	26% 13% 4 8% 7% 3 5% 4 5% 6% 19%	1800
	21st to end	Day	31% 15% 5% 7% 6% 3 4 3 4 4 17%	1895
November	1st to 10th	Day	19% 18% 4 8% 6% 4 4 4 4 5% 25%	1672
	11th to 20th	Day	19% 21% 6% 9% 6% 4 3 5% 5% 5% 17%	1549
	21st to end	Day	21% 26% 9% 10% 5% 4 3 4 3 4 12%	1520
December	1st to 10th	Day	18% 31% 14% 11% 5% 3 3 3 2 3 6%	1520
	11th to 20th	Day	19% 21% 9% 17% 9% 3 4 3 3 4 8%	1811
	21st to end	Day	27% 24% 10% 10% 6% 3 2 3 3 4 8%	2431
January	1st to 10th	Night	17% 25% 11% 20% 7% 3 3 2 2 3 6%	4585
	11th to 20th	Night	15% 21% 11% 20% 17% 3 3 2 2 2 5%	4372
	21st to end	Night	19% 20% 10% 17% 9% 3 5% 3 3 3 8%	4532
February	1st to 10th	Night	15% 19% 7% 15% 12% 4 4 4 3 4 13%	2470
	11th to 20th	Night	15% 15% 9% 15% 11% 4 4 4 4 4 15%	2323
	21st to end	Night	17% 13% 8% 13% 8% 3 5% 4 4 5% 20%	1776
March	1st to 10th	Night	14% 12% 7% 11% 7% 3 4 4 4 6% 28%	2051
	11th to 20th	Night	15% 12% 6% 9% 6% 4 5% 4 4 5% 29%	1979
	21st to end	Night	19% 11% 5% 8% 6% 4 4 4 4 5% 31%	2178
April	1st to 10th	Night	22% 11% 4 6% 5% 3 3 4 5% 6% 30%	1910
	11th to 20th	Night	17% 9% 3 6% 6% 3 4 4 4 8% 37%	1597
	21st to end	Night	19% 10% 5% 6% 6% 4 4 4 4 6% 33%	1620
May	1st to 10th	Night	17% 8% 3 6% 5% 4 5% 5% 5% 7% 36%	1620
	11th to 20th	Night	16% 7% 3 5% 6% 3 4 4 5% 6% 41%	1575
	21st to end	Night	10% 5% 2 5% 5% 3 4 5% 6% 8% 47%	1550
June	1st to 10th	Night	14% 6% 3 6% 4 4 5% 4 5% 8% 42%	1311
	11th to 20th	Night	12% 7% 2 5% 5% 3 5% 4 7% 10% 41%	1260
	21st to end	Night	12% 5% 3 6% 4 3 6% 5% 5% 7% 43%	1260
July	1st to 10th	Night	7% 3 2 5% 5% 3 4 4 6% 8% 54%	1260
	11th to 20th	Night	11% 4 2 5% 4 3 4 6% 5% 9% 47%	1402
	21st to end	Night	9% 5% 3 6% 5% 3 4 4 6% 7% 48%	1771
August	1st to 10th	Night	10% 5% 2 5% 6% 3 4 5% 6% 8% 46%	1611
	11th to 20th	Night	9% 6% 2 4 4 2 4 6% 7% 7% 48%	1598
	21st to end	Night	11% 6% 3 6% 6% 3 5% 4 5% 8% 45%	1782
September	1st to 10th	Night	12% 6% 2 6% 6% 3 4 4 5% 7% 44%	1846
	11th to 20th	Night	13% 5% 2 5% 5% 3 3 4 5% 7% 48%	1980
	21st to end	Night	18% 6% 3 7% 6% 3 4 4 4 7% 37%	1980
October	1st to 10th	Night	20% 8% 3 6% 5% 3 3 4 4 7% 36%	2107
	11th to 20th	Night	28% 12% 4 8% 6% 4 4 4 5% 5% 21%	2160
	21st to end	Night	29% 15% 5% 8% 7% 3 4 3 4 4 18%	2456
November	1st to 10th	Night	20% 17% 4 7% 5% 3 4 4 4 6% 25%	2406
	11th to 20th	Night	20% 21% 6% 10% 6% 3 4 4 5% 5% 16%	2629
	21st to end	Night	24% 23% 9% 10% 6% 3 4 3 3 4 13%	2660
December	1st to 10th	Night	22% 27% 14% 11% 5% 2 3 2 2 3 8%	2660
	11th to 20th	Night	15% 24% 12% 15% 6% 3 4 3 3 3 11%	3382
	21st to end	Night	27% 24% 10% 11% 7% 3 4 3 3 3 7%	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	84% 2 9% 4 1	2369
	11th to 20th	Day	90% 3 3 2 2	2593
	21st to end	Day	86% 2 8% 4 1	3124
February	1st to 10th	Day	75% 4 8% 11% 2	1710
	11th to 20th	Day	75% 3 7% 11% 3	1622
	21st to end	Day	65% 5% 10% 12% 7%	1480
March	1st to 10th	Day	59% 4 13% 16% 7% 1	1898
	11th to 20th	Day	55% 4 12% 18% 9% 2	1980
	21st to end	Day	54% 5% 11% 20% 9% 1	2178
April	1st to 10th	Day	55% 5% 11% 20% 10%	2064
	11th to 20th	Day	47% 4 11% 22% 14% 2	2312
	21st to end	Day	47% 5% 14% 19% 12% 2	2340
May	1st to 10th	Day	47% 4 9% 24% 14% 1	2340
	11th to 20th	Day	43% 5% 10% 24% 15% 3	2322
	21st to end	Day	38% 4 15% 25% 16% 3	2725
June	1st to 10th	Day	40% 5% 12% 26% 15% 2	2645
	11th to 20th	Day	36% 6% 12% 27% 17% 1	2700
	21st to end	Day	38% 5% 14% 26% 16% 1	2700
July	1st to 10th	Day	28% 6% 15% 27% 20% 3	2626
	11th to 20th	Day	33% 6% 15% 30% 14% 2	2476
	21st to end	Day	34% 6% 15% 29% 15% 2	2405
August	1st to 10th	Day	35% 6% 18% 29% 11% 2	2314
	11th to 20th	Day	36% 6% 19% 26% 12% 1	2303
	21st to end	Day	38% 5% 14% 28% 14% 1	2574
September	1st to 10th	Day	40% 7% 16% 25% 11% 2	2092
	11th to 20th	Day	38% 5% 15% 31% 11% 1	1980
	21st to end	Day	46% 5% 16% 24% 9% 1	1980
October	1st to 10th	Day	49% 4 12% 22% 11% 1	1852
	11th to 20th	Day	65% 4 12% 14% 5% 1	1800
	21st to end	Day	70% 4 10% 13% 3	1895
November	1st to 10th	Day	63% 3 9% 18% 6% 1	1672
	11th to 20th	Day	69% 4 12% 9% 6% 1	1549
	21st to end	Day	78% 3 8% 9% 1	1520
December	1st to 10th	Day	86% 2 6% 5% 1	1520
	11th to 20th	Day	82% 4 8% 6% 1	1810
	21st to end	Day	83% 2 11% 4	2431
January	1st to 10th	Night	86% 2 7% 4	4585
	11th to 20th	Night	89% 2 5% 3 1	4372
	21st to end	Night	83% 2 9% 4 1	4532
February	1st to 10th	Night	78% 3 8% 11% 1	2470
	11th to 20th	Night	73% 3 9% 12% 2	2325
	21st to end	Night	67% 3 10% 13% 7%	1776
March	1st to 10th	Night	57% 4 10% 19% 8% 1	2061
	11th to 20th	Night	56% 4 9% 19% 10% 2	1980
	21st to end	Night	56% 3 9% 18% 11% 2	2178
April	1st to 10th	Night	55% 4 8% 20% 12% 1	1910
	11th to 20th	Night	48% 4 9% 20% 17% 2	1597
	21st to end	Night	53% 3 9% 18% 15% 3	1620
May	1st to 10th	Night	47% 4 9% 22% 15% 2	1620
	11th to 20th	Night	45% 4 8% 21% 18% 4	1576
	21st to end	Night	35% 5% 14% 26% 16% 4	1551
June	1st to 10th	Night	42% 3 10% 26% 17% 2	1311
	11th to 20th	Night	38% 4 13% 24% 18% 3	1260
	21st to end	Night	39% 3 13% 26% 17% 2	1260
July	1st to 10th	Night	28% 5% 11% 28% 25% 3	1225
	11th to 20th	Night	33% 6% 12% 29% 18% 2	1357
	21st to end	Night	37% 5% 16% 25% 16% 2	1672
August	1st to 10th	Night	36% 5% 13% 33% 13% 1	1600
	11th to 20th	Night	32% 6% 15% 29% 16% 2	1598
	21st to end	Night	37% 5% 13% 29% 13% 2	1782
September	1st to 10th	Night	39% 5% 12% 26% 16% 2	1846
	11th to 20th	Night	36% 3 15% 29% 16% 1	1980
	21st to end	Night	47% 4 14% 24% 11% 1	1980
October	1st to 10th	Night	50% 4 10% 22% 13% 1	2107
	11th to 20th	Night	66% 4 10% 14% 5%	2160
	21st to end	Night	70% 2 11% 11% 5%	2456
November	1st to 10th	Night	60% 5% 11% 18% 6%	2406
	11th to 20th	Night	70% 3 11% 11% 4 1	2629
	21st to end	Night	77% 2 11% 7% 1	2660
December	1st to 10th	Night	84% 2 7% 5% 2	2660
	11th to 20th	Night	80% 3 10% 5% 1	3382
	21st to end	Night	85% 2 10% 3	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	26% 19% 32% 16% 7% 1	225
	11th to 20th	Day	23% 16% 40% 14% 6%	270
	21st to end	Day	28% 12% 34% 23% 3	297
February	1st to 10th	Day	23% 20% 39% 14% 4	270
	11th to 20th	Day	19% 17% 47% 15% 2	252
	21st to end	Day	26% 26% 33% 13% 2	198
March	1st to 10th	Day	25% 13% 39% 17% 6% 1	338
	11th to 20th	Day	21% 12% 29% 27% 9% 1	420
	21st to end	Day	27% 9% 30% 25% 7% 1	462
April	1st to 10th	Day	21% 14% 33% 23% 9%	420
	11th to 20th	Day	24% 10% 28% 22% 10% 6%	412
	21st to end	Day	23% 7% 31% 27% 10% 2	420
May	1st to 10th	Day	19% 9% 25% 30% 14% 3	423
	11th to 20th	Day	19% 4 24% 28% 19% 6%	447
	21st to end	Day	16% 3 21% 30% 22% 7%	485
June	1st to 10th	Day	12% 3 23% 37% 21% 3	575
	11th to 20th	Day	13% 5% 22% 36% 20% 5%	630
	21st to end	Day	16% 3 19% 39% 18% 4	630
July	1st to 10th	Day	8% 3 17% 35% 27% 10%	621
	11th to 20th	Day	14% 4 21% 33% 21% 7%	614
	21st to end	Day	10% 2 17% 38% 24% 8%	488
August	1st to 10th	Day	10% 2 18% 35% 23% 12%	446
	11th to 20th	Day	15% 2 12% 34% 26% 12%	439
	21st to end	Day	14% 4 18% 32% 25% 7%	495
September	1st to 10th	Day	15% 4 22% 30% 22% 8%	450
	11th to 20th	Day	13% 4 17% 27% 28% 11%	450
	21st to end	Day	20% 7% 24% 22% 20% 8%	450
October	1st to 10th	Day	22% 9% 23% 23% 17% 5%	450
	11th to 20th	Day	31% 14% 27% 22% 6%	450
	21st to end	Day	34% 14% 29% 16% 6% 1	410
November	1st to 10th	Day	25% 18% 28% 19% 9% 1	270
	11th to 20th	Day	30% 19% 29% 15% 5% 1	194
	21st to end	Day	33% 18% 32% 14% 2	180
December	1st to 10th	Day	39% 16% 28% 14% 2 1	180
	11th to 20th	Day	32% 24% 27% 13% 3 1	180
	21st to end	Day	33% 20% 36% 9% 2	198
January	1st to 10th	Night	27% 17% 34% 15% 6% 1	950
	11th to 20th	Night	29% 17% 29% 20% 4	908
	21st to end	Night	24% 13% 32% 25% 6%	836
February	1st to 10th	Night	27% 15% 30% 24% 4	760
	11th to 20th	Night	25% 14% 33% 23% 6% 1	722
	21st to end	Night	25% 14% 36% 21% 4	592
March	1st to 10th	Night	20% 11% 36% 24% 8%	720
	11th to 20th	Night	21% 12% 33% 27% 7% 1	720
	21st to end	Night	24% 8% 27% 30% 10% 1	792
April	1st to 10th	Night	27% 10% 26% 30% 6% 1	706
	11th to 20th	Night	23% 8% 28% 28% 12% 2	533
	21st to end	Night	23% 8% 24% 31% 12% 1	540
May	1st to 10th	Night	19% 5% 25% 35% 14% 2	540
	11th to 20th	Night	21% 3 20% 38% 16% 2	514
	21st to end	Night	12% 3 21% 40% 23% 2	389
June	1st to 10th	Night	19% 2 19% 40% 19% 1	360
	11th to 20th	Night	15% 3 21% 39% 21% 1	360
	21st to end	Night	13% 4 18% 40% 24% 1	360
July	1st to 10th	Night	8% 4 11% 48% 26% 3	350
	11th to 20th	Night	11% 3 14% 40% 26% 6%	483
	21st to end	Night	10% 3 13% 46% 25% 2	591
August	1st to 10th	Night	13% 2 12% 37% 31% 5%	537
	11th to 20th	Night	12% 3 13% 35% 32% 5%	534
	21st to end	Night	14% 4 16% 34% 28% 4	594
September	1st to 10th	Night	15% 5% 19% 35% 19% 8%	701
	11th to 20th	Night	15% 3 16% 35% 25% 5%	720
	21st to end	Night	20% 9% 19% 29% 18% 5%	720
October	1st to 10th	Night	24% 8% 23% 26% 17% 2	720
	11th to 20th	Night	34% 10% 23% 25% 8% 1	720
	21st to end	Night	37% 12% 26% 21% 4	792
November	1st to 10th	Night	31% 11% 24% 25% 9%	740
	11th to 20th	Night	33% 18% 27% 16% 6% 1	760
	21st to end	Night	37% 14% 27% 18% 4	760
December	1st to 10th	Night	40% 16% 25% 15% 4	760
	11th to 20th	Night	28% 21% 33% 15% 3 1	817
	21st to end	Night	37% 13% 33% 15% 2	1045

Page generated at 2024-02-12 06:35:35. Version ac07

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