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 2026-07-16.

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	14% 12% 5% 10% 5% 4 4 3 5% 6% 31%	137838
	Night	15% 15% 6% 13% 6% 4 4 3 4 5% 25%	134888
Transparency	Day	53% 4 12% 20% 10% 1	141387
	Night	61% 3 10% 16% 9% 1	139426
Seeing	Day	19% 9% 26% 26% 15% 4	17415
	Night	23% 11% 25% 27% 12% 2	26683

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	15% 23% 10% 26% 6% 4 3 2 2 2 6%	4394
	11th to 20th	Day	9% 24% 13% 27% 14% 5% 2 1 1 1 3	4807
	21st to end	Day	11% 16% 9% 23% 11% 9% 6% 2 3 3 5%	5780
February	1st to 10th	Day	13% 20% 7% 16% 9% 5% 4 3 4 5% 14%	1890
	11th to 20th	Day	13% 16% 9% 18% 11% 6% 5% 3 3 3 14%	1848
	21st to end	Day	15% 17% 5% 14% 7% 4 5% 3 4 5% 20%	1730
March	1st to 10th	Day	15% 13% 6% 13% 8% 3 4 3 4 5% 27%	4849
	11th to 20th	Day	12% 15% 6% 10% 4 4 4 4 6% 7% 27%	5090
	21st to end	Day	18% 14% 7% 11% 5% 4 4 3 4 5% 25%	5586
April	1st to 10th	Day	17% 14% 5% 9% 4 4 4 4 4 6% 30%	2410
	11th to 20th	Day	18% 10% 3 6% 4 3 4 3 5% 7% 36%	2702
	21st to end	Day	17% 9% 4 7% 5% 3 4 4 5% 7% 36%	2730
May	1st to 10th	Day	14% 8% 3 7% 5% 4 4 4 6% 8% 38%	7642
	11th to 20th	Day	14% 8% 3 7% 4 4 4 4 5% 8% 39%	7685
	21st to end	Day	17% 8% 2 5% 3 3 3 3 4 6% 45%	9060
June	1st to 10th	Day	12% 6% 2 6% 5% 4 4 4 7% 8% 41%	3086
	11th to 20th	Day	11% 5% 2 5% 5% 5% 5% 4 6% 9% 43%	3150
	21st to end	Day	13% 6% 2 6% 4 4 4 4 6% 8% 43%	3150
July	1st to 10th	Day	11% 7% 2 6% 4 4 4 4 6% 9% 42%	6969
	11th to 20th	Day	11% 5% 2 5% 3 3 4 3 5% 8% 51%	6495
	21st to end	Day	8% 5% 2 5% 3 4 4 4 6% 9% 51%	6424
August	1st to 10th	Day	11% 6% 2 6% 4 5% 6% 4 7% 9% 41%	4234
	11th to 20th	Day	13% 5% 2 6% 5% 4 5% 4 6% 9% 40%	4174
	21st to end	Day	9% 5% 2 6% 4 4 5% 4 7% 8% 45%	4675
September	1st to 10th	Day	13% 5% 2 6% 5% 5% 5% 4 7% 9% 40%	2324
	11th to 20th	Day	13% 5% 2 6% 4 3 4 4 6% 7% 47%	2200
	21st to end	Day	17% 8% 3 7% 5% 4 5% 4 5% 8% 35%	2200
October	1st to 10th	Day	19% 8% 2 6% 5% 4 4 4 5% 7% 36%	2057
	11th to 20th	Day	23% 13% 3 9% 5% 4 4 4 5% 6% 22%	2000
	21st to end	Day	28% 15% 5% 8% 5% 4 4 3 5% 4 19%	2105
November	1st to 10th	Day	19% 19% 4 9% 5% 4 4 3 5% 4 24%	1852
	11th to 20th	Day	19% 22% 5% 11% 5% 4 4 4 5% 5% 17%	1711
	21st to end	Day	19% 31% 8% 10% 4 4 3 3 3 4 11%	1680
December	1st to 10th	Day	17% 38% 11% 13% 5% 4 3 2 2 2 4	2680
	11th to 20th	Day	21% 23% 8% 22% 6% 3 3 2 2 3 7%	2916
	21st to end	Day	26% 23% 8% 13% 6% 4 3 2 3 4 8%	3553
January	1st to 10th	Night	14% 22% 11% 30% 6% 4 2 2 2 2 5%	8514
	11th to 20th	Night	11% 25% 11% 27% 12% 4 2 1 2 2 3	8084
	21st to end	Night	11% 16% 8% 21% 12% 9% 6% 3 3 3 7%	8401
February	1st to 10th	Night	14% 21% 6% 17% 11% 6% 3 3 3 3 13%	2730
	11th to 20th	Night	14% 17% 8% 16% 9% 5% 4 2 4 4 15%	2652
	21st to end	Night	15% 16% 6% 14% 7% 5% 4 3 4 5% 20%	2076
March	1st to 10th	Night	14% 12% 5% 11% 7% 4 4 3 4 6% 29%	5210
	11th to 20th	Night	10% 13% 6% 9% 5% 4 5% 4 6% 8% 30%	5089
	21st to end	Night	20% 11% 6% 12% 5% 5% 4 2 4 4 28%	5588
April	1st to 10th	Night	20% 12% 4 9% 5% 3 4 3 4 6% 29%	2227
	11th to 20th	Night	17% 10% 2 7% 6% 5% 4 3 4 7% 35%	1867
	21st to end	Night	17% 10% 4 8% 5% 5% 4 3 5% 6% 33%	1890
May	1st to 10th	Night	17% 8% 3 7% 4 4 4 3 5% 7% 38%	5257
	11th to 20th	Night	17% 8% 3 7% 4 4 4 3 5% 6% 40%	5161
	21st to end	Night	18% 6% 2 5% 3 3 3 3 5% 6% 45%	5114
June	1st to 10th	Night	14% 7% 3 6% 4 5% 4 3 5% 8% 42%	1529
	11th to 20th	Night	11% 7% 2 6% 5% 4 5% 4 7% 10% 38%	1470
	21st to end	Night	12% 6% 3 6% 4 4 5% 4 6% 7% 42%	1470
July	1st to 10th	Night	9% 7% 3 8% 5% 4 4 3 6% 8% 44%	3230
	11th to 20th	Night	11% 5% 1 5% 3 4 3 4 5% 9% 49%	3577
	21st to end	Night	9% 6% 2 5% 4 4 4 3 6% 7% 49%	4428
August	1st to 10th	Night	11% 6% 2 7% 5% 4 5% 4 6% 6% 45%	2915
	11th to 20th	Night	12% 8% 2 6% 4 4 4 4 6% 7% 43%	2875
	21st to end	Night	10% 5% 3 6% 4 4 4 3 5% 8% 48%	3223
September	1st to 10th	Night	12% 6% 2 7% 5% 4 4 3 6% 7% 45%	2052
	11th to 20th	Night	12% 5% 1 6% 4 3 3 2 5% 7% 52%	2200
	21st to end	Night	17% 7% 3 8% 4 4 5% 3 5% 7% 36%	2200
October	1st to 10th	Night	18% 8% 3 7% 4 4 3 3 4 7% 39%	2342
	11th to 20th	Night	27% 12% 3 9% 5% 5% 4 2 5% 5% 24%	2400
	21st to end	Night	26% 15% 4 10% 5% 4 4 2 5% 5% 21%	2730
November	1st to 10th	Night	19% 18% 4 9% 5% 4 4 3 4 6% 25%	2666
	11th to 20th	Night	19% 22% 5% 11% 5% 4 4 3 5% 5% 15%	2907
	21st to end	Night	23% 26% 7% 11% 5% 4 3 2 3 3 12%	2940
December	1st to 10th	Night	16% 30% 11% 16% 6% 5% 4 2 2 2 5%	4720
	11th to 20th	Night	14% 28% 10% 18% 6% 4 3 2 2 2 9%	5487
	21st to end	Night	23% 23% 9% 14% 7% 4 4 3 3 4 8%	7667

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	88% 2 6% 4 1	4395
	11th to 20th	Day	93% 2 2 1 1	4838
	21st to end	Day	86% 2 8% 3 1	5780
February	1st to 10th	Day	74% 4 8% 12% 2	1890
	11th to 20th	Day	74% 4 7% 11% 3	1857
	21st to end	Day	66% 5% 11% 12% 7%	1730
March	1st to 10th	Day	60% 3 16% 15% 6%	4852
	11th to 20th	Day	54% 4 15% 18% 8% 1	5090
	21st to end	Day	60% 4 12% 15% 8% 1	5586
April	1st to 10th	Day	55% 4 11% 20% 10%	2410
	11th to 20th	Day	47% 4 11% 23% 14% 2	2702
	21st to end	Day	46% 5% 13% 21% 12% 2	2730
May	1st to 10th	Day	44% 5% 12% 22% 14% 4	7651
	11th to 20th	Day	44% 5% 13% 23% 14% 1	7689
	21st to end	Day	41% 3 9% 25% 18% 4	9061
June	1st to 10th	Day	40% 5% 12% 26% 16% 2	3086
	11th to 20th	Day	37% 6% 12% 27% 17% 1	3150
	21st to end	Day	39% 5% 14% 27% 15% 1	3150
July	1st to 10th	Day	37% 5% 15% 23% 18% 1	6896
	11th to 20th	Day	31% 5% 12% 35% 16% 1	6417
	21st to end	Day	30% 5% 14% 30% 19% 2	6240
August	1st to 10th	Day	37% 6% 15% 26% 15% 1	4221
	11th to 20th	Day	40% 5% 17% 27% 10% 1	4213
	21st to end	Day	34% 6% 15% 31% 14% 1	4674
September	1st to 10th	Day	38% 6% 16% 27% 11% 2	2324
	11th to 20th	Day	35% 4 15% 32% 13% 1	2200
	21st to end	Day	47% 5% 15% 23% 10% 1	2200
October	1st to 10th	Day	42% 5% 12% 28% 12% 1	3343
	11th to 20th	Day	49% 4 12% 24% 10%	3240
	21st to end	Day	61% 4 13% 17% 5%	3381
November	1st to 10th	Day	63% 3 9% 18% 6% 1	1852
	11th to 20th	Day	69% 4 12% 9% 6%	1711
	21st to end	Day	79% 3 8% 8% 1	1680
December	1st to 10th	Day	89% 3 4 3	2680
	11th to 20th	Day	85% 3 6% 5% 1	2915
	21st to end	Day	83% 2 9% 5% 1	3553
January	1st to 10th	Night	89% 2 5% 3 1	8514
	11th to 20th	Night	91% 2 3 2 1	8128
	21st to end	Night	83% 3 8% 4 2	8401
February	1st to 10th	Night	77% 3 7% 12% 2	2730
	11th to 20th	Night	73% 3 10% 12% 3	2654
	21st to end	Night	66% 3 11% 13% 6%	2076
March	1st to 10th	Night	55% 3 14% 19% 8% 1	5220
	11th to 20th	Night	50% 4 16% 20% 8% 1	5090
	21st to end	Night	58% 4 11% 16% 10% 1	5588
April	1st to 10th	Night	56% 3 9% 19% 12% 1	2227
	11th to 20th	Night	50% 4 8% 20% 16% 2	1867
	21st to end	Night	52% 4 9% 17% 15% 2	1890
May	1st to 10th	Night	47% 3 10% 20% 14% 5%	5264
	11th to 20th	Night	47% 5% 10% 22% 15% 1	5162
	21st to end	Night	41% 3 8% 26% 18% 3	5115
June	1st to 10th	Night	41% 3 9% 25% 19% 3	1529
	11th to 20th	Night	40% 4 13% 24% 17% 3	1470
	21st to end	Night	39% 4 13% 26% 17% 2	1470
July	1st to 10th	Night	38% 4 13% 24% 18% 4	3195
	11th to 20th	Night	33% 5% 11% 30% 20% 2	3532
	21st to end	Night	35% 5% 11% 27% 22% 1	4297
August	1st to 10th	Night	39% 5% 11% 29% 15% 1	2904
	11th to 20th	Night	37% 6% 15% 25% 16% 1	2902
	21st to end	Night	35% 5% 11% 34% 13% 1	3223
September	1st to 10th	Night	38% 5% 12% 28% 15% 2	2052
	11th to 20th	Night	33% 3 15% 30% 18% 1	2200
	21st to end	Night	47% 4 13% 23% 11% 1	2200
October	1st to 10th	Night	40% 4 11% 27% 18% 1	3836
	11th to 20th	Night	54% 3 13% 19% 9%	3899
	21st to end	Night	55% 3 15% 20% 8%	4404
November	1st to 10th	Night	61% 5% 10% 18% 6%	2666
	11th to 20th	Night	70% 3 10% 11% 4 1	2907
	21st to end	Night	78% 2 11% 8% 1	2940
December	1st to 10th	Night	87% 3 6% 3 1	4720
	11th to 20th	Night	84% 2 7% 6% 1	5487
	21st to end	Night	82% 2 9% 5% 1	7667

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% 20% 34% 14% 6% 1	275
	11th to 20th	Day	23% 21% 38% 13% 5%	330
	21st to end	Day	25% 15% 34% 21% 3	363
February	1st to 10th	Day	22% 21% 38% 15% 4	330
	11th to 20th	Day	20% 19% 45% 14% 2	330
	21st to end	Day	24% 23% 34% 15% 3	273
March	1st to 10th	Day	24% 14% 39% 18% 5% 1	446
	11th to 20th	Day	24% 14% 28% 26% 7% 1	540
	21st to end	Day	27% 12% 31% 23% 6% 1	594
April	1st to 10th	Day	22% 15% 34% 21% 7%	540
	11th to 20th	Day	26% 11% 27% 22% 10% 5%	532
	21st to end	Day	21% 9% 31% 27% 10% 2	540
May	1st to 10th	Day	17% 10% 28% 30% 13% 2	543
	11th to 20th	Day	18% 5% 25% 28% 18% 5%	567
	21st to end	Day	18% 3 25% 28% 20% 6%	617
June	1st to 10th	Day	12% 4 25% 34% 21% 3	716
	11th to 20th	Day	12% 5% 25% 36% 17% 4	780
	21st to end	Day	16% 4 21% 39% 17% 4	780
July	1st to 10th	Day	9% 3 17% 36% 26% 8%	771
	11th to 20th	Day	13% 4 21% 33% 22% 7%	738
	21st to end	Day	10% 2 17% 37% 25% 8%	576
August	1st to 10th	Day	10% 2 17% 35% 23% 12%	526
	11th to 20th	Day	15% 2 14% 32% 25% 11%	519
	21st to end	Day	13% 4 18% 33% 26% 7%	583
September	1st to 10th	Day	14% 5% 22% 28% 21% 10%	530
	11th to 20th	Day	11% 3 14% 26% 31% 15%	530
	21st to end	Day	20% 7% 22% 24% 20% 8%	530
October	1st to 10th	Day	21% 9% 23% 24% 18% 6%	530
	11th to 20th	Day	28% 14% 28% 23% 8% 1	530
	21st to end	Day	31% 15% 29% 18% 6% 1	488
November	1st to 10th	Day	27% 18% 29% 18% 8% 1	330
	11th to 20th	Day	32% 19% 28% 16% 5% 1	236
	21st to end	Day	37% 18% 30% 14% 1	220
December	1st to 10th	Day	39% 16% 27% 14% 2 1	220
	11th to 20th	Day	34% 25% 26% 13% 2	220
	21st to end	Day	36% 18% 33% 10% 2	242
January	1st to 10th	Night	26% 19% 34% 15% 5% 1	1050
	11th to 20th	Night	29% 18% 29% 19% 4	1002
	21st to end	Night	23% 15% 32% 24% 5%	924
February	1st to 10th	Night	25% 15% 31% 24% 4	840
	11th to 20th	Night	24% 15% 32% 23% 5%	823
	21st to end	Night	24% 14% 37% 21% 4	692
March	1st to 10th	Night	20% 12% 37% 23% 8%	840
	11th to 20th	Night	21% 14% 32% 25% 6% 1	840
	21st to end	Night	24% 9% 28% 29% 9% 1	924
April	1st to 10th	Night	26% 11% 27% 29% 6%	823
	11th to 20th	Night	23% 9% 27% 28% 11% 2	623
	21st to end	Night	22% 9% 24% 32% 11% 1	630
May	1st to 10th	Night	17% 6% 25% 36% 14% 2	630
	11th to 20th	Night	20% 5% 22% 37% 15% 1	600
	21st to end	Night	14% 4 21% 39% 21% 2	455
June	1st to 10th	Night	19% 3 20% 39% 19% 1	420
	11th to 20th	Night	14% 3 22% 40% 20% 1	420
	21st to end	Night	13% 4 19% 41% 22% 1	420
July	1st to 10th	Night	9% 4 11% 48% 26% 3	410
	11th to 20th	Night	10% 3 14% 41% 26% 5%	552
	21st to end	Night	10% 3 13% 45% 27% 2	657
August	1st to 10th	Night	13% 2 12% 39% 30% 5%	597
	11th to 20th	Night	12% 3 13% 35% 31% 5%	594
	21st to end	Night	14% 4 16% 34% 29% 4	660
September	1st to 10th	Night	14% 5% 19% 32% 21% 8%	779
	11th to 20th	Night	14% 3 15% 34% 29% 6%	800
	21st to end	Night	20% 8% 19% 30% 18% 5%	800
October	1st to 10th	Night	22% 8% 24% 28% 17% 2	800
	11th to 20th	Night	33% 10% 23% 25% 8% 1	800
	21st to end	Night	35% 12% 27% 22% 4	880
November	1st to 10th	Night	31% 13% 24% 24% 8%	820
	11th to 20th	Night	34% 18% 27% 16% 5%	840
	21st to end	Night	38% 14% 27% 17% 3	840
December	1st to 10th	Night	38% 17% 25% 15% 4	840
	11th to 20th	Night	28% 21% 33% 15% 2 1	903
	21st to end	Night	36% 14% 32% 15% 3	1155

Page generated at 2026-07-13 03:14:54. Version ac07

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