Carberry
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Carberry clear sky chart from 2005-11-06 to 2026-06-16.

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	10% 9% 3 8% 5% 5% 5% 4 6% 8% 36%	141832
	Night	9% 9% 4 10% 6% 5% 5% 4 6% 8% 35%	139059
Transparency	Day	45% 6% 16% 24% 9% 1	141542
	Night	46% 6% 15% 23% 9% 1	138934
Seeing	Day	15% 9% 31% 28% 14% 3	18466
	Night	14% 7% 32% 33% 12% 1	28450

By Month

Percentage Cloud Cover NW (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	4 15% 6% 14% 9% 7% 6% 5% 7% 7% 20%	4125
	11th to 20th	Day	4 9% 4 14% 9% 8% 10% 7% 8% 9% 19%	4456
	21st to end	Day	5% 9% 4 11% 6% 6% 5% 4 6% 9% 34%	5188
February	1st to 10th	Day	9% 12% 5% 12% 9% 7% 7% 4 7% 6% 22%	1686
	11th to 20th	Day	6% 10% 4 9% 9% 8% 6% 5% 7% 7% 28%	1864
	21st to end	Day	7% 11% 5% 11% 7% 8% 8% 4 7% 7% 26%	1730
March	1st to 10th	Day	8% 11% 4 10% 8% 6% 5% 4 6% 10% 27%	4600
	11th to 20th	Day	9% 14% 5% 10% 7% 5% 5% 4 7% 8% 25%	5013
	21st to end	Day	9% 11% 6% 14% 7% 7% 5% 3 6% 6% 27%	5694
April	1st to 10th	Day	9% 12% 3 8% 4 4 5% 4 6% 8% 36%	2546
	11th to 20th	Day	13% 12% 4 10% 5% 5% 5% 3 5% 6% 31%	2702
	21st to end	Day	14% 8% 3 8% 5% 5% 5% 4 5% 6% 35%	2730
May	1st to 10th	Day	12% 9% 3 6% 3 3 4 3 5% 7% 44%	7838
	11th to 20th	Day	20% 10% 3 8% 5% 5% 5% 4 6% 6% 29%	8701
	21st to end	Day	12% 6% 2 6% 4 4 4 3 5% 7% 44%	9683
June	1st to 10th	Day	14% 7% 2 6% 5% 4 5% 5% 7% 8% 37%	3150
	11th to 20th	Day	16% 6% 3 7% 6% 5% 5% 5% 6% 7% 35%	3076
	21st to end	Day	12% 6% 2 6% 5% 6% 5% 5% 8% 8% 37%	3000
July	1st to 10th	Day	8% 4 2 6% 5% 5% 7% 6% 8% 11% 40%	6800
	11th to 20th	Day	10% 5% 2 6% 4 5% 5% 4 7% 8% 44%	6800
	21st to end	Day	7% 5% 2 6% 4 4 5% 4 8% 11% 45%	7017
August	1st to 10th	Day	9% 6% 2 6% 4 4 5% 5% 7% 9% 43%	4552
	11th to 20th	Day	10% 5% 2 5% 3 4 4 4 6% 10% 47%	4180
	21st to end	Day	10% 6% 2 5% 3 4 4 4 6% 8% 48%	4675
September	1st to 10th	Day	10% 4 2 6% 4 4 4 3 5% 7% 50%	2445
	11th to 20th	Day	16% 7% 2 6% 5% 4 4 3 5% 7% 41%	2200
	21st to end	Day	15% 6% 2 5% 4 3 4 3 5% 7% 46%	2200
October	1st to 10th	Day	12% 8% 3 6% 3 4 3 3 4 6% 48%	3458
	11th to 20th	Day	9% 8% 3 7% 5% 4 4 3 5% 8% 43%	2996
	21st to end	Day	13% 12% 4 8% 4 4 4 3 5% 7% 35%	3190
November	1st to 10th	Day	17% 13% 6% 9% 5% 4 4 3 4 5% 31%	1785
	11th to 20th	Day	8% 16% 4 12% 6% 4 4 4 5% 7% 30%	1638
	21st to end	Day	10% 12% 5% 11% 7% 5% 4 4 5% 7% 29%	1470
December	1st to 10th	Day	9% 13% 5% 17% 10% 11% 7% 4 4 5% 15%	2360
	11th to 20th	Day	8% 13% 5% 13% 8% 6% 5% 5% 7% 8% 22%	2709
	21st to end	Day	6% 10% 4 16% 8% 5% 5% 3 5% 6% 32%	3575
January	1st to 10th	Night	5% 11% 6% 17% 8% 8% 6% 4 6% 8% 21%	8799
	11th to 20th	Night	4 11% 5% 13% 7% 7% 9% 7% 9% 8% 19%	8469
	21st to end	Night	6% 10% 6% 13% 6% 5% 6% 5% 7% 10% 28%	9026
February	1st to 10th	Night	8% 12% 5% 11% 8% 6% 6% 4 5% 6% 27%	2932
	11th to 20th	Night	7% 10% 3 8% 6% 6% 7% 5% 7% 8% 35%	2663
	21st to end	Night	7% 10% 4 8% 7% 6% 5% 4 6% 8% 34%	2076
March	1st to 10th	Night	8% 11% 4 10% 6% 5% 5% 6% 8% 9% 29%	5494
	11th to 20th	Night	7% 12% 5% 10% 5% 5% 5% 4 5% 7% 34%	5167
	21st to end	Night	10% 12% 4 12% 6% 6% 5% 4 5% 6% 30%	5482
April	1st to 10th	Night	7% 7% 3 8% 5% 4 5% 4 6% 7% 42%	2074
	11th to 20th	Night	14% 13% 4 9% 5% 3 4 3 5% 7% 32%	1869
	21st to end	Night	12% 10% 4 8% 5% 5% 5% 4 5% 6% 37%	1890
May	1st to 10th	Night	13% 8% 3 7% 5% 4 4 4 5% 6% 41%	5106
	11th to 20th	Night	15% 8% 3 7% 4 4 5% 4 6% 8% 36%	4190
	21st to end	Night	13% 6% 2 5% 4 4 4 3 4 6% 49%	4523
June	1st to 10th	Night	13% 4 2 6% 4 5% 4 4 7% 8% 43%	1470
	11th to 20th	Night	12% 6% 2 7% 4 5% 4 3 5% 8% 44%	1435
	21st to end	Night	10% 5% 2 5% 4 5% 5% 5% 7% 10% 42%	1400
July	1st to 10th	Night	6% 3 1 5% 3 4 5% 4 7% 10% 51%	3180
	11th to 20th	Night	7% 4 2 5% 3 4 4 5% 6% 8% 52%	3180
	21st to end	Night	5% 4 2 5% 4 4 5% 5% 5% 9% 51%	3846
August	1st to 10th	Night	6% 4 2 6% 4 4 5% 5% 6% 9% 50%	2608
	11th to 20th	Night	6% 4 2 5% 4 4 6% 4 7% 9% 50%	2878
	21st to end	Night	10% 5% 2 5% 3 4 3 3 5% 7% 53%	3234
September	1st to 10th	Night	7% 5% 2 5% 3 4 4 3 6% 8% 53%	1951
	11th to 20th	Night	14% 6% 2 6% 4 3 4 3 6% 8% 46%	2200
	21st to end	Night	14% 7% 3 7% 3 3 3 3 4 8% 46%	2200
October	1st to 10th	Night	11% 7% 2 5% 4 3 4 3 5% 7% 48%	3689
	11th to 20th	Night	10% 6% 2 6% 4 4 5% 4 6% 8% 44%	4147
	21st to end	Night	8% 9% 3 7% 5% 5% 5% 4 6% 7% 43%	4610
November	1st to 10th	Night	12% 11% 4 9% 6% 5% 4 4 6% 6% 33%	2731
	11th to 20th	Night	10% 14% 6% 11% 6% 4 5% 3 5% 6% 30%	2977
	21st to end	Night	9% 13% 5% 12% 6% 4 5% 3 4 6% 32%	3150
December	1st to 10th	Night	8% 13% 5% 16% 10% 8% 6% 4 5% 5% 19%	5050
	11th to 20th	Night	9% 13% 5% 12% 7% 6% 6% 4 5% 6% 26%	5718
	21st to end	Night	6% 9% 4 13% 9% 7% 7% 5% 6% 7% 30%	7645

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	59% 5% 13% 16% 6%	4125
	11th to 20th	Day	59% 5% 12% 18% 7%	4479
	21st to end	Day	47% 5% 14% 25% 9%	5188
February	1st to 10th	Day	59% 6% 11% 16% 7%	1686
	11th to 20th	Day	49% 9% 14% 20% 9%	1873
	21st to end	Day	54% 7% 14% 18% 7%	1730
March	1st to 10th	Day	49% 9% 20% 16% 7%	4600
	11th to 20th	Day	55% 6% 14% 20% 5%	5015
	21st to end	Day	55% 6% 12% 21% 6%	5694
April	1st to 10th	Day	45% 6% 16% 24% 9% 1	2546
	11th to 20th	Day	53% 6% 13% 18% 10% 1	2702
	21st to end	Day	47% 6% 16% 21% 8% 1	2730
May	1st to 10th	Day	39% 4 13% 31% 13% 1	7838
	11th to 20th	Day	54% 5% 9% 23% 8% 1	8705
	21st to end	Day	38% 5% 9% 23% 23% 1	9683
June	1st to 10th	Day	43% 8% 17% 22% 10% 1	3150
	11th to 20th	Day	46% 7% 17% 19% 10% 1	3076
	21st to end	Day	40% 10% 20% 24% 5% 1	3000
July	1st to 10th	Day	37% 5% 29% 24% 5%	6726
	11th to 20th	Day	38% 4 20% 33% 5%	6719
	21st to end	Day	34% 4 25% 29% 7%	6821
August	1st to 10th	Day	37% 5% 19% 29% 10%	4536
	11th to 20th	Day	32% 6% 21% 35% 6%	4219
	21st to end	Day	35% 4 21% 32% 8%	4674
September	1st to 10th	Day	33% 6% 18% 31% 10% 2	2445
	11th to 20th	Day	43% 7% 17% 25% 8% 1	2200
	21st to end	Day	38% 6% 15% 31% 10%	2200
October	1st to 10th	Day	39% 3 12% 36% 9%	3458
	11th to 20th	Day	41% 4 12% 33% 10%	2996
	21st to end	Day	49% 5% 11% 27% 9%	3190
November	1st to 10th	Day	56% 6% 12% 18% 7% 1	1785
	11th to 20th	Day	54% 6% 16% 17% 6% 1	1638
	21st to end	Day	55% 8% 16% 16% 5% 1	1470
December	1st to 10th	Day	71% 5% 13% 9% 3	2360
	11th to 20th	Day	57% 5% 17% 14% 7%	2710
	21st to end	Day	53% 4 12% 20% 11% 1	3575
January	1st to 10th	Night	60% 6% 10% 18% 6%	8800
	11th to 20th	Night	58% 5% 11% 20% 5%	8508
	21st to end	Night	51% 5% 13% 24% 7%	9026
February	1st to 10th	Night	55% 6% 13% 17% 8% 1	2932
	11th to 20th	Night	44% 7% 15% 23% 11% 1	2664
	21st to end	Night	47% 6% 14% 23% 10%	2076
March	1st to 10th	Night	46% 8% 17% 19% 9% 1	5494
	11th to 20th	Night	46% 6% 13% 23% 11% 1	5167
	21st to end	Night	52% 7% 11% 23% 6%	5482
April	1st to 10th	Night	38% 7% 13% 24% 16% 2	2074
	11th to 20th	Night	51% 5% 12% 20% 12% 1	1869
	21st to end	Night	46% 6% 13% 20% 12% 2	1890
May	1st to 10th	Night	44% 5% 10% 25% 17%	5106
	11th to 20th	Night	45% 4 13% 26% 9% 3	4190
	21st to end	Night	37% 4 11% 20% 25% 3	4526
June	1st to 10th	Night	36% 7% 20% 24% 11% 2	1470
	11th to 20th	Night	38% 8% 16% 25% 11% 2	1435
	21st to end	Night	34% 11% 21% 26% 7% 1	1400
July	1st to 10th	Night	28% 5% 29% 30% 7%	3145
	11th to 20th	Night	30% 5% 17% 40% 7% 1	3138
	21st to end	Night	30% 4 26% 30% 8% 1	3737
August	1st to 10th	Night	30% 5% 18% 31% 14% 1	2600
	11th to 20th	Night	29% 5% 23% 32% 9% 1	2905
	21st to end	Night	32% 4 20% 34% 10% 1	3234
September	1st to 10th	Night	29% 6% 15% 34% 14% 2	1951
	11th to 20th	Night	37% 7% 18% 26% 12% 1	2200
	21st to end	Night	38% 5% 13% 31% 11% 2	2200
October	1st to 10th	Night	37% 4 13% 28% 16% 2	3689
	11th to 20th	Night	37% 4 13% 32% 13% 1	4147
	21st to end	Night	41% 4 14% 34% 7%	4610
November	1st to 10th	Night	50% 7% 15% 18% 8% 2	2731
	11th to 20th	Night	55% 7% 15% 15% 6% 1	2977
	21st to end	Night	54% 6% 17% 18% 5%	3150
December	1st to 10th	Night	66% 5% 12% 12% 4	5050
	11th to 20th	Night	58% 5% 15% 16% 6%	5716
	21st to end	Night	52% 5% 13% 18% 10% 1	7645

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	9% 8% 35% 30% 15% 3	330
	11th to 20th	Day	11% 12% 33% 33% 10% 2	330
	21st to end	Day	14% 9% 35% 27% 12% 2	363
February	1st to 10th	Day	15% 13% 39% 25% 8% 1	330
	11th to 20th	Day	9% 10% 38% 29% 13% 1	330
	21st to end	Day	7% 7% 40% 31% 12% 2	273
March	1st to 10th	Day	13% 12% 32% 33% 8% 2	330
	11th to 20th	Day	15% 12% 29% 29% 12% 2	330
	21st to end	Day	15% 12% 34% 25% 11% 3	408
April	1st to 10th	Day	15% 12% 36% 27% 9% 1	566
	11th to 20th	Day	19% 12% 34% 23% 11% 1	740
	21st to end	Day	16% 10% 34% 27% 12% 1	750
May	1st to 10th	Day	17% 11% 28% 28% 14% 2	753
	11th to 20th	Day	22% 9% 32% 22% 12% 4	775
	21st to end	Day	20% 9% 24% 27% 17% 3	844
June	1st to 10th	Day	16% 13% 29% 25% 12% 5%	780
	11th to 20th	Day	16% 11% 34% 24% 12% 3	756
	21st to end	Day	12% 8% 29% 30% 17% 4	730
July	1st to 10th	Day	9% 5% 26% 33% 20% 7%	721
	11th to 20th	Day	12% 7% 30% 27% 19% 5%	718
	21st to end	Day	7% 5% 25% 33% 23% 7%	794
August	1st to 10th	Day	10% 5% 27% 31% 21% 6%	726
	11th to 20th	Day	10% 5% 25% 29% 22% 8%	715
	21st to end	Day	14% 7% 25% 32% 18% 4	803
September	1st to 10th	Day	11% 9% 32% 30% 15% 3	575
	11th to 20th	Day	21% 6% 32% 29% 11% 1	330
	21st to end	Day	19% 11% 28% 29% 12% 2	330
October	1st to 10th	Day	23% 12% 27% 21% 14% 3	330
	11th to 20th	Day	18% 10% 36% 26% 9% 1	330
	21st to end	Day	22% 9% 36% 24% 7% 1	363
November	1st to 10th	Day	27% 10% 31% 21% 10% 1	330
	11th to 20th	Day	15% 12% 36% 27% 10% 1	330
	21st to end	Day	15% 10% 38% 29% 8%	330
December	1st to 10th	Day	14% 8% 39% 24% 11% 3	330
	11th to 20th	Day	18% 12% 38% 27% 5% 1	330
	21st to end	Day	11% 7% 38% 28% 13% 3	363
January	1st to 10th	Night	12% 9% 34% 33% 11% 1	1050
	11th to 20th	Night	14% 8% 38% 32% 8% 1	1050
	21st to end	Night	13% 8% 37% 34% 7% 1	1155
February	1st to 10th	Night	13% 9% 35% 31% 10% 2	1050
	11th to 20th	Night	11% 7% 32% 38% 10% 2	1029
	21st to end	Night	11% 7% 33% 34% 13% 2	692
March	1st to 10th	Night	15% 7% 32% 31% 12% 3	840
	11th to 20th	Night	10% 9% 36% 33% 11% 1	668
	21st to end	Night	17% 6% 31% 30% 13% 2	693
April	1st to 10th	Night	9% 7% 36% 37% 10% 1	630
	11th to 20th	Night	19% 7% 32% 33% 8% 1	623
	21st to end	Night	14% 9% 33% 31% 12% 1	630
May	1st to 10th	Night	18% 7% 30% 35% 10% 1	630
	11th to 20th	Night	17% 8% 29% 33% 12%	621
	21st to end	Night	20% 7% 26% 33% 13% 1	683
June	1st to 10th	Night	14% 7% 33% 31% 14% 1	630
	11th to 20th	Night	13% 5% 33% 34% 14% 1	615
	21st to end	Night	12% 6% 25% 39% 17% 1	600
July	1st to 10th	Night	6% 4 24% 43% 22% 1	585
	11th to 20th	Night	7% 5% 27% 41% 19% 1	582
	21st to end	Night	6% 3 25% 43% 20% 3	657
August	1st to 10th	Night	8% 4 23% 43% 22% 1	597
	11th to 20th	Night	9% 3 23% 39% 22% 4	594
	21st to end	Night	12% 6% 24% 38% 18% 1	660
September	1st to 10th	Night	10% 4 31% 35% 19% 3	600
	11th to 20th	Night	16% 6% 28% 39% 12%	600
	21st to end	Night	17% 7% 29% 35% 12% 1	600
October	1st to 10th	Night	18% 8% 35% 29% 10% 1	660
	11th to 20th	Night	19% 9% 31% 31% 10%	946
	21st to end	Night	16% 11% 36% 27% 9% 1	1100
November	1st to 10th	Night	18% 9% 35% 28% 9% 1	1025
	11th to 20th	Night	16% 9% 36% 27% 9% 2	1050
	21st to end	Night	15% 11% 37% 29% 7% 1	1050
December	1st to 10th	Night	12% 7% 38% 31% 10% 2	1050
	11th to 20th	Night	16% 12% 34% 28% 9% 2	1050
	21st to end	Night	17% 5% 33% 31% 13% 2	1155

Page generated at 2026-06-13 01:31:40. Version ac07

Copyright © 2026 Attilla Danko.