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 2025-03-12.

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	15% 12% 5% 10% 5% 4 4 3 5% 6% 30%	108648
	Night	15% 15% 6% 13% 6% 4 4 3 4 5% 25%	110386
Transparency	Day	54% 4 12% 19% 10% 1	112240
	Night	61% 3 10% 16% 8% 1	114956
Seeing	Day	20% 9% 26% 27% 15% 4	15546
	Night	24% 10% 25% 27% 12% 2	25041

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	13% 22% 10% 29% 7% 4 3 2 2 2 6%	3388
	11th to 20th	Day	9% 23% 12% 28% 14% 4 3 1 2 1 3	3691
	21st to end	Day	14% 19% 10% 23% 8% 6% 5% 2 3 3 6%	4466
February	1st to 10th	Day	14% 20% 7% 16% 9% 5% 3 3 4 5% 14%	1800
	11th to 20th	Day	13% 16% 9% 18% 11% 6% 5% 3 3 3 13%	1758
	21st to end	Day	15% 17% 5% 14% 7% 4 5% 3 4 5% 20%	1650
March	1st to 10th	Day	17% 15% 5% 10% 6% 3 4 3 4 5% 28%	3405
	11th to 20th	Day	12% 16% 8% 11% 4 4 4 4 5% 6% 27%	3491
	21st to end	Day	15% 12% 5% 10% 6% 5% 5% 4 5% 6% 27%	3815
April	1st to 10th	Day	17% 14% 5% 8% 4 4 4 4 4 6% 30%	2180
	11th to 20th	Day	17% 10% 3 7% 4 3 4 3 5% 7% 35%	2442
	21st to end	Day	18% 9% 4 7% 4 3 3 4 5% 7% 36%	2470
May	1st to 10th	Day	16% 8% 3 6% 5% 4 4 3 5% 7% 37%	4108
	11th to 20th	Day	16% 8% 3 6% 4 4 4 3 5% 8% 38%	4112
	21st to end	Day	13% 6% 2 5% 3 3 3 3 5% 7% 48%	4837
June	1st to 10th	Day	12% 6% 3 6% 5% 4 5% 4 7% 8% 40%	2792
	11th to 20th	Day	11% 5% 2 5% 5% 5% 5% 4 6% 9% 44%	2850
	21st to end	Day	14% 6% 2 6% 4 4 4 4 6% 7% 44%	2850
July	1st to 10th	Day	11% 6% 2 6% 4 4 5% 4 7% 9% 41%	4760
	11th to 20th	Day	11% 5% 2 5% 4 4 4 4 6% 8% 49%	4488
	21st to end	Day	9% 5% 2 5% 4 4 4 5% 6% 9% 47%	4466
August	1st to 10th	Day	11% 6% 2 6% 4 5% 6% 4 7% 9% 40%	4104
	11th to 20th	Day	13% 6% 2 6% 5% 4 5% 4 6% 9% 39%	4044
	21st to end	Day	9% 5% 2 6% 4 4 5% 4 7% 8% 46%	4532
September	1st to 10th	Day	13% 5% 2 6% 5% 5% 4 4 6% 8% 40%	2208
	11th to 20th	Day	14% 5% 2 6% 4 3 4 4 6% 7% 46%	2090
	21st to end	Day	17% 8% 3 7% 4 5% 5% 3 5% 8% 35%	2090
October	1st to 10th	Day	19% 9% 2 6% 5% 4 4 4 5% 7% 34%	1954
	11th to 20th	Day	24% 14% 3 9% 5% 5% 4 4 5% 6% 21%	1900
	21st to end	Day	29% 16% 5% 8% 5% 4 4 3 5% 5% 18%	2000
November	1st to 10th	Day	19% 19% 4 9% 5% 4 4 3 5% 4 24%	1762
	11th to 20th	Day	19% 22% 5% 11% 5% 4 3 4 5% 5% 17%	1630
	21st to end	Day	20% 30% 8% 10% 4 4 3 3 2 4 11%	1600
December	1st to 10th	Day	17% 38% 11% 12% 5% 4 3 2 2 2 4	2600
	11th to 20th	Day	21% 23% 8% 21% 6% 3 3 2 2 3 7%	2839
	21st to end	Day	26% 23% 8% 12% 6% 4 3 2 3 4 8%	3476
January	1st to 10th	Night	13% 22% 11% 30% 6% 4 2 2 2 2 5%	6561
	11th to 20th	Night	12% 22% 10% 27% 13% 4 3 2 2 2 4	6206
	21st to end	Night	14% 18% 9% 22% 7% 7% 6% 3 3 3 8%	6490
February	1st to 10th	Night	14% 21% 6% 16% 11% 5% 3 3 3 4 13%	2600
	11th to 20th	Night	15% 17% 8% 16% 10% 6% 4 3 4 4 14%	2523
	21st to end	Night	15% 15% 6% 14% 7% 4 4 3 4 5% 21%	1980
March	1st to 10th	Night	13% 13% 5% 9% 5% 4 3 3 4 7% 33%	3654
	11th to 20th	Night	11% 14% 6% 9% 5% 4 4 3 5% 6% 32%	3497
	21st to end	Night	16% 10% 6% 12% 5% 5% 4 3 4 5% 31%	3817
April	1st to 10th	Night	21% 13% 4 7% 5% 3 4 3 5% 6% 30%	2015
	11th to 20th	Night	18% 10% 2 6% 5% 4 4 3 4 7% 36%	1687
	21st to end	Night	18% 11% 4 8% 5% 4 4 3 5% 6% 32%	1710
May	1st to 10th	Night	15% 8% 3 7% 4 5% 4 3 5% 7% 39%	2833
	11th to 20th	Night	15% 9% 3 7% 5% 4 4 3 5% 6% 39%	2767
	21st to end	Night	11% 5% 1 6% 4 3 4 4 6% 7% 48%	2738
June	1st to 10th	Night	14% 7% 3 7% 4 5% 4 3 5% 8% 40%	1383
	11th to 20th	Night	11% 7% 2 6% 5% 4 4 4 7% 10% 39%	1330
	21st to end	Night	12% 5% 3 6% 4 4 5% 4 5% 7% 42%	1330
July	1st to 10th	Night	7% 6% 3 8% 5% 4 4 3 5% 8% 47%	2210
	11th to 20th	Night	12% 4 1 5% 3 4 3 4 5% 8% 51%	2477
	21st to end	Night	7% 7% 2 6% 4 4 5% 3 7% 8% 47%	3087
August	1st to 10th	Night	11% 6% 2 7% 5% 4 4 4 6% 6% 44%	2825
	11th to 20th	Night	12% 8% 2 6% 4 4 4 4 6% 7% 43%	2785
	21st to end	Night	10% 5% 3 6% 4 4 4 3 5% 8% 48%	3124
September	1st to 10th	Night	12% 6% 2 7% 5% 4 4 3 5% 7% 45%	1949
	11th to 20th	Night	12% 5% 2 6% 4 3 4 2 5% 7% 50%	2090
	21st to end	Night	18% 7% 3 8% 4 4 5% 3 4 7% 37%	2090
October	1st to 10th	Night	19% 8% 3 7% 4 4 3 3 4 7% 37%	2225
	11th to 20th	Night	27% 12% 4 9% 5% 5% 4 2 5% 5% 23%	2280
	21st to end	Night	27% 15% 4 10% 5% 4 4 3 5% 5% 19%	2593
November	1st to 10th	Night	20% 18% 4 8% 4 4 4 3 4 6% 25%	2536
	11th to 20th	Night	20% 23% 5% 11% 5% 4 4 3 5% 5% 16%	2768
	21st to end	Night	23% 26% 7% 11% 5% 4 3 2 3 3 12%	2800
December	1st to 10th	Night	17% 30% 11% 16% 6% 4 4 2 2 2 6%	4580
	11th to 20th	Night	14% 29% 10% 18% 5% 4 3 2 2 2 9%	5344
	21st to end	Night	23% 23% 9% 14% 7% 4 4 2 3 4 8%	7502

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	87% 2 6% 4 1	3389
	11th to 20th	Day	92% 2 3 2 1	3722
	21st to end	Day	86% 2 8% 3 1	4466
February	1st to 10th	Day	74% 4 9% 12% 2	1800
	11th to 20th	Day	75% 4 7% 11% 4	1767
	21st to end	Day	66% 5% 11% 12% 6%	1650
March	1st to 10th	Day	59% 3 14% 18% 6%	3408
	11th to 20th	Day	55% 5% 14% 17% 7% 1	3491
	21st to end	Day	54% 6% 12% 17% 10% 1	3815
April	1st to 10th	Day	54% 5% 11% 20% 10%	2180
	11th to 20th	Day	47% 4 11% 23% 14% 2	2442
	21st to end	Day	47% 5% 13% 19% 13% 2	2470
May	1st to 10th	Day	45% 5% 12% 19% 16% 2	4120
	11th to 20th	Day	45% 4 18% 22% 9% 1	4116
	21st to end	Day	36% 4 13% 21% 20% 6%	4837
June	1st to 10th	Day	40% 5% 12% 26% 15% 2	2792
	11th to 20th	Day	36% 6% 12% 27% 18% 1	2850
	21st to end	Day	39% 5% 14% 26% 16% 1	2850
July	1st to 10th	Day	37% 5% 17% 22% 16% 2	4686
	11th to 20th	Day	31% 5% 13% 37% 13% 1	4410
	21st to end	Day	32% 6% 15% 27% 18% 2	4324
August	1st to 10th	Day	38% 6% 15% 25% 15% 1	4091
	11th to 20th	Day	40% 5% 17% 26% 10% 1	4083
	21st to end	Day	35% 5% 15% 31% 14% 1	4531
September	1st to 10th	Day	39% 6% 16% 26% 11% 2	2208
	11th to 20th	Day	36% 4 14% 31% 14% 1	2090
	21st to end	Day	46% 5% 15% 23% 9% 1	2090
October	1st to 10th	Day	43% 5% 13% 27% 12% 1	3240
	11th to 20th	Day	50% 4 12% 24% 9%	3140
	21st to end	Day	61% 4 13% 17% 4	3276
November	1st to 10th	Day	63% 3 9% 18% 6% 1	1762
	11th to 20th	Day	69% 4 12% 9% 6%	1630
	21st to end	Day	79% 3 8% 8% 1	1600
December	1st to 10th	Day	89% 3 4 3 1	2600
	11th to 20th	Day	85% 3 6% 6% 1	2838
	21st to end	Day	83% 2 9% 6% 1	3476
January	1st to 10th	Night	88% 2 6% 4	6561
	11th to 20th	Night	90% 2 4 2 1	6250
	21st to end	Night	82% 2 9% 5% 2	6490
February	1st to 10th	Night	77% 3 8% 11% 1	2600
	11th to 20th	Night	74% 3 9% 11% 2	2525
	21st to end	Night	65% 3 11% 14% 6%	1980
March	1st to 10th	Night	52% 4 14% 23% 7%	3664
	11th to 20th	Night	51% 4 14% 20% 9% 1	3498
	21st to end	Night	54% 4 12% 20% 9% 1	3817
April	1st to 10th	Night	55% 3 8% 20% 12% 1	2015
	11th to 20th	Night	49% 4 9% 20% 17% 2	1687
	21st to end	Night	53% 4 9% 17% 15% 3	1710
May	1st to 10th	Night	44% 3 12% 20% 16% 4	2840
	11th to 20th	Night	46% 4 12% 21% 14% 2	2768
	21st to end	Night	35% 4 13% 23% 21% 4	2739
June	1st to 10th	Night	43% 3 10% 25% 17% 2	1383
	11th to 20th	Night	39% 4 13% 24% 18% 3	1330
	21st to end	Night	40% 3 13% 26% 17% 2	1330
July	1st to 10th	Night	36% 4 12% 25% 17% 6%	2175
	11th to 20th	Night	31% 5% 12% 33% 17% 1	2432
	21st to end	Night	34% 6% 14% 24% 20% 2	2988
August	1st to 10th	Night	39% 5% 11% 30% 15% 1	2814
	11th to 20th	Night	37% 6% 15% 25% 16% 1	2812
	21st to end	Night	35% 6% 11% 34% 13% 1	3124
September	1st to 10th	Night	39% 5% 12% 26% 16% 2	1949
	11th to 20th	Night	34% 3 15% 29% 18% 1	2090
	21st to end	Night	47% 4 13% 23% 11%	2090
October	1st to 10th	Night	40% 4 11% 26% 18% 1	3719
	11th to 20th	Night	55% 3 14% 19% 9%	3779
	21st to end	Night	55% 3 15% 20% 7%	4267
November	1st to 10th	Night	60% 5% 10% 18% 6%	2536
	11th to 20th	Night	70% 3 11% 11% 5% 1	2768
	21st to end	Night	78% 2 11% 8% 1	2800
December	1st to 10th	Night	87% 3 6% 3 1	4580
	11th to 20th	Night	84% 3 7% 6% 1	5344
	21st to end	Night	82% 2 9% 5% 1	7502

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	24% 20% 33% 15% 6% 1	250
	11th to 20th	Day	22% 19% 39% 14% 6%	300
	21st to end	Day	27% 14% 34% 22% 3	330
February	1st to 10th	Day	23% 22% 38% 14% 3	300
	11th to 20th	Day	19% 20% 45% 13% 2	300
	21st to end	Day	25% 22% 34% 16% 3	249
March	1st to 10th	Day	23% 13% 40% 18% 5% 1	410
	11th to 20th	Day	21% 13% 29% 27% 8% 1	464
	21st to end	Day	26% 11% 30% 25% 7% 1	506
April	1st to 10th	Day	20% 15% 33% 23% 9%	460
	11th to 20th	Day	25% 11% 28% 22% 10% 5%	452
	21st to end	Day	22% 7% 31% 27% 10% 2	460
May	1st to 10th	Day	18% 10% 25% 30% 14% 3	463
	11th to 20th	Day	20% 4 23% 28% 20% 6%	487
	21st to end	Day	16% 4 22% 30% 22% 7%	529
June	1st to 10th	Day	13% 4 24% 36% 21% 3	622
	11th to 20th	Day	13% 5% 24% 36% 19% 4	680
	21st to end	Day	17% 4 21% 38% 17% 4	680
July	1st to 10th	Day	9% 3 17% 35% 26% 9%	671
	11th to 20th	Day	14% 4 21% 33% 21% 8%	663
	21st to end	Day	11% 2 16% 37% 26% 9%	532
August	1st to 10th	Day	10% 2 19% 35% 22% 12%	486
	11th to 20th	Day	16% 2 13% 32% 25% 12%	479
	21st to end	Day	13% 4 17% 33% 26% 6%	539
September	1st to 10th	Day	15% 5% 22% 29% 21% 8%	490
	11th to 20th	Day	12% 3 16% 26% 29% 13%	490
	21st to end	Day	20% 7% 23% 23% 20% 8%	490
October	1st to 10th	Day	21% 9% 24% 24% 17% 5%	490
	11th to 20th	Day	29% 13% 26% 23% 7% 1	490
	21st to end	Day	33% 14% 29% 17% 6% 1	449
November	1st to 10th	Day	26% 18% 28% 19% 8% 1	300
	11th to 20th	Day	31% 19% 29% 15% 5% 1	215
	21st to end	Day	36% 18% 31% 14% 2	200
December	1st to 10th	Day	40% 17% 27% 14% 2 1	200
	11th to 20th	Day	34% 24% 27% 13% 3 1	200
	21st to end	Day	35% 19% 35% 10% 2	220
January	1st to 10th	Night	26% 18% 34% 15% 6% 1	1000
	11th to 20th	Night	29% 18% 29% 20% 4	955
	21st to end	Night	24% 14% 32% 24% 6%	880
February	1st to 10th	Night	26% 15% 31% 24% 3	800
	11th to 20th	Night	25% 15% 33% 22% 5% 1	783
	21st to end	Night	23% 14% 38% 21% 4	660
March	1st to 10th	Night	20% 12% 37% 23% 8%	800
	11th to 20th	Night	20% 13% 33% 26% 7% 1	767
	21st to end	Night	24% 8% 27% 30% 9% 1	836
April	1st to 10th	Night	27% 10% 27% 30% 6% 1	745
	11th to 20th	Night	23% 8% 28% 28% 12% 2	563
	21st to end	Night	23% 8% 24% 32% 12% 1	570
May	1st to 10th	Night	18% 5% 25% 36% 14% 2	570
	11th to 20th	Night	20% 4 21% 37% 16% 1	542
	21st to end	Night	12% 3 21% 39% 22% 2	411
June	1st to 10th	Night	19% 3 19% 39% 19% 1	380
	11th to 20th	Night	15% 3 21% 39% 21% 1	380
	21st to end	Night	13% 4 19% 39% 23% 1	380
July	1st to 10th	Night	9% 4 11% 48% 25% 3	370
	11th to 20th	Night	11% 3 14% 40% 26% 6%	511
	21st to end	Night	10% 4 13% 44% 27% 2	624
August	1st to 10th	Night	13% 2 12% 38% 29% 5%	567
	11th to 20th	Night	12% 3 13% 35% 31% 5%	564
	21st to end	Night	14% 4 16% 34% 28% 4	627
September	1st to 10th	Night	15% 5% 20% 33% 20% 8%	740
	11th to 20th	Night	14% 3 16% 34% 27% 6%	760
	21st to end	Night	20% 8% 19% 30% 18% 5%	760
October	1st to 10th	Night	23% 8% 24% 26% 17% 2	760
	11th to 20th	Night	33% 10% 23% 25% 8% 1	760
	21st to end	Night	35% 12% 27% 22% 4	836
November	1st to 10th	Night	31% 12% 24% 24% 8%	780
	11th to 20th	Night	34% 18% 27% 16% 6% 1	800
	21st to end	Night	38% 14% 27% 18% 3	800
December	1st to 10th	Night	39% 17% 25% 16% 3	800
	11th to 20th	Night	29% 20% 33% 15% 3 1	860
	21st to end	Night	36% 13% 32% 16% 3	1100

Page generated at 2025-03-09 08:08:43. Version ac07

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