Camp Kintail
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camp Kintail clear sky chart from 2005-11-05 to 2024-10-14.

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% 4 9% 5% 4 4 3 5% 7% 32%	101231
	Night	16% 14% 5% 11% 6% 4 4 3 4 5% 27%	97360
Transparency	Day	52% 5% 13% 20% 10% 1	100991
	Night	59% 4 11% 17% 9% 1	97223
Seeing	Day	19% 9% 25% 27% 15% 5%	15134
	Night	24% 10% 25% 27% 12% 2	24414

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	17% 27% 10% 20% 6% 4 2 2 2 2 8%	2368
	11th to 20th	Day	10% 22% 11% 26% 15% 3 3 1 2 2 4	2593
	21st to end	Day	19% 22% 10% 18% 7% 5% 4 2 3 3 7%	3124
February	1st to 10th	Day	14% 20% 7% 16% 9% 5% 4 3 3 5% 13%	1710
	11th to 20th	Day	13% 16% 9% 18% 10% 5% 5% 2 3 3 14%	1667
	21st to end	Day	15% 17% 5% 13% 6% 4 5% 3 4 5% 21%	1570
March	1st to 10th	Day	17% 15% 5% 10% 6% 4 4 3 4 5% 28%	3299
	11th to 20th	Day	12% 16% 8% 11% 4 4 4 4 5% 6% 27%	3480
	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	25% 14% 3 10% 5% 5% 4 4 5% 6% 19%	1830
	21st to end	Day	29% 16% 5% 8% 5% 4 4 3 5% 4 17%	1895
November	1st to 10th	Day	19% 19% 4 9% 5% 4 4 3 5% 4 24%	1672
	11th to 20th	Day	18% 23% 5% 10% 5% 4 3 4 5% 5% 17%	1549
	21st to end	Day	20% 28% 8% 11% 4 4 3 3 3 4 12%	1520
December	1st to 10th	Day	18% 35% 10% 12% 4 4 3 2 3 3 6%	1520
	11th to 20th	Day	19% 22% 9% 18% 8% 4 4 3 3 3 8%	1811
	21st to end	Day	27% 25% 10% 11% 5% 3 2 2 3 4 8%	2431
January	1st to 10th	Night	17% 26% 11% 21% 6% 4 2 2 3 3 6%	4585
	11th to 20th	Night	15% 22% 9% 23% 13% 4 3 2 2 2 5%	4372
	21st to end	Night	19% 22% 9% 19% 7% 4 4 2 3 3 8%	4532
February	1st to 10th	Night	15% 22% 6% 16% 11% 5% 3 3 3 4 13%	2470
	11th to 20th	Night	14% 17% 8% 16% 9% 5% 4 3 4 4 14%	2394
	21st to end	Night	16% 15% 6% 14% 7% 4 4 3 4 5% 21%	1884
March	1st to 10th	Night	13% 13% 5% 9% 5% 4 3 3 4 7% 34%	3540
	11th to 20th	Night	11% 15% 6% 10% 5% 4 4 3 5% 6% 32%	3479
	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	28% 12% 4 9% 5% 5% 4 2 5% 5% 22%	2203
	21st to end	Night	28% 15% 4 10% 6% 4 3 3 4 4 18%	2456
November	1st to 10th	Night	20% 18% 3 8% 4 4 4 3 4 6% 25%	2406
	11th to 20th	Night	19% 23% 5% 11% 5% 4 4 3 5% 5% 16%	2629
	21st to end	Night	23% 25% 7% 11% 5% 4 3 2 3 3 13%	2660
December	1st to 10th	Night	22% 32% 10% 12% 4 3 3 2 2 3 8%	2660
	11th to 20th	Night	15% 26% 10% 16% 5% 4 3 3 3 3 11%	3382
	21st to end	Night	26% 25% 10% 12% 5% 3 4 2 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	74% 4 7% 11% 4	1676
	21st to end	Day	65% 5% 11% 12% 7%	1570
March	1st to 10th	Day	59% 3 14% 19% 5%	3302
	11th to 20th	Day	55% 5% 14% 17% 7% 1	3480
	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	48% 5% 12% 23% 11% 1	1954
	11th to 20th	Day	65% 4 12% 14% 5% 1	1831
	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 10% 12% 2	2396
	21st to end	Night	65% 3 11% 13% 7%	1884
March	1st to 10th	Night	51% 4 14% 24% 7%	3550
	11th to 20th	Night	51% 4 14% 20% 9% 1	3480
	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	48% 4 11% 22% 14% 1	2225
	11th to 20th	Night	65% 4 11% 14% 5%	2207
	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% 19% 46% 14% 2	270
	21st to end	Day	25% 24% 35% 13% 3	225
March	1st to 10th	Day	24% 13% 38% 18% 6% 1	374
	11th to 20th	Day	22% 13% 29% 28% 8% 1	460
	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	31% 14% 27% 22% 6%	462
	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% 32% 22% 6% 1	743
	21st to end	Night	24% 14% 37% 21% 4	628
March	1st to 10th	Night	20% 11% 36% 24% 8%	760
	11th to 20th	Night	20% 13% 33% 26% 7% 1	760
	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	34% 10% 23% 25% 8% 1	735
	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 2024-10-11 10:50:00. Version ac07

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