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 2024-02-05.

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	12% 8% 4 7% 6% 4 5% 5% 6% 7% 35%	77733
	Night	10% 9% 4 8% 7% 4 5% 5% 5% 7% 36%	81111
Transparency	Day	46% 8% 16% 22% 8% 1	77446
	Night	46% 7% 15% 22% 9% 1	80979
Seeing	Day	14% 9% 30% 29% 15% 3	15111
	Night	14% 7% 32% 34% 12% 1	25241

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	5% 18% 7% 11% 10% 4 5% 6% 7% 7% 20%	2219
	11th to 20th	Day	4 8% 5% 14% 11% 8% 8% 7% 7% 8% 19%	2368
	21st to end	Day	9% 11% 5% 11% 9% 4 6% 6% 6% 6% 28%	2794
February	1st to 10th	Day	9% 10% 5% 11% 10% 6% 6% 6% 6% 6% 24%	1476
	11th to 20th	Day	6% 9% 5% 8% 10% 5% 7% 6% 7% 7% 28%	1591
	21st to end	Day	8% 10% 6% 10% 7% 6% 8% 5% 7% 7% 27%	1480
March	1st to 10th	Day	11% 12% 6% 10% 10% 5% 6% 5% 4 7% 24%	1800
	11th to 20th	Day	8% 10% 5% 9% 7% 4 6% 5% 7% 7% 31%	1944
	21st to end	Day	12% 11% 6% 10% 6% 4 5% 4 6% 6% 30%	2216
April	1st to 10th	Day	10% 11% 4 7% 5% 3 5% 5% 6% 8% 36%	2182
	11th to 20th	Day	13% 11% 5% 8% 7% 4 5% 4 5% 6% 31%	2312
	21st to end	Day	15% 8% 3 7% 6% 3 6% 5% 5% 7% 35%	2340
May	1st to 10th	Day	15% 9% 3 6% 5% 3 5% 5% 5% 7% 38%	2394
	11th to 20th	Day	18% 7% 3 6% 4 3 5% 5% 6% 7% 37%	2624
	21st to end	Day	21% 7% 3 6% 4 3 4 5% 5% 8% 34%	2918
June	1st to 10th	Day	15% 6% 3 5% 6% 3 5% 5% 7% 9% 36%	2700
	11th to 20th	Day	18% 5% 3 6% 6% 4 6% 5% 5% 7% 34%	2700
	21st to end	Day	12% 5% 3 5% 6% 4 6% 6% 8% 9% 36%	2700
July	1st to 10th	Day	8% 4 2 4 5% 4 6% 6% 7% 9% 46%	2700
	11th to 20th	Day	10% 6% 2 5% 5% 3 5% 6% 7% 9% 43%	2700
	21st to end	Day	7% 3 1 4 5% 3 4 6% 7% 9% 51%	2791
August	1st to 10th	Day	9% 5% 3 5% 5% 3 4 6% 6% 8% 46%	2507
	11th to 20th	Day	10% 4 2 4 5% 3 5% 6% 7% 9% 45%	2310
	21st to end	Day	13% 6% 2 5% 4 3 3 4 5% 6% 49%	2574
September	1st to 10th	Day	10% 4 2 5% 5% 3 4 4 5% 7% 49%	2202
	11th to 20th	Day	15% 6% 2 5% 5% 3 4 4 5% 7% 44%	1980
	21st to end	Day	16% 7% 2 5% 5% 3 3 5% 6% 7% 43%	1980
October	1st to 10th	Day	18% 11% 3 6% 5% 4 3 3 4 6% 37%	1908
	11th to 20th	Day	13% 11% 4 6% 5% 3 4 4 5% 8% 37%	1666
	21st to end	Day	15% 12% 6% 8% 7% 3 5% 4 5% 6% 29%	1782
November	1st to 10th	Day	18% 12% 6% 9% 6% 2 4 4 4 6% 29%	1612
	11th to 20th	Day	8% 16% 5% 11% 8% 3 4 5% 5% 7% 29%	1482
	21st to end	Day	12% 11% 5% 9% 8% 4 5% 5% 5% 7% 29%	1330
December	1st to 10th	Day	9% 10% 7% 13% 12% 5% 7% 5% 5% 7% 21%	1330
	11th to 20th	Day	9% 15% 6% 15% 10% 4 5% 6% 6% 6% 18%	1679
	21st to end	Day	7% 9% 5% 11% 7% 3 4 4 5% 7% 38%	2442
January	1st to 10th	Night	6% 13% 6% 12% 8% 5% 7% 5% 7% 8% 23%	4737
	11th to 20th	Night	6% 10% 5% 13% 11% 5% 8% 7% 7% 8% 19%	4537
	21st to end	Night	9% 12% 7% 14% 8% 4 5% 5% 4 7% 26%	4873
February	1st to 10th	Night	7% 11% 5% 9% 9% 5% 7% 6% 5% 6% 30%	2577
	11th to 20th	Night	7% 10% 4 7% 7% 4 7% 6% 6% 7% 34%	2273
	21st to end	Night	7% 9% 5% 7% 8% 5% 5% 5% 6% 8% 35%	1776
March	1st to 10th	Night	12% 11% 5% 8% 7% 4 5% 7% 7% 6% 29%	2160
	11th to 20th	Night	6% 10% 4 7% 7% 4 5% 6% 5% 8% 39%	2013
	21st to end	Night	12% 11% 3 8% 6% 4 4 5% 5% 6% 35%	2138
April	1st to 10th	Night	7% 6% 4 7% 6% 3 6% 5% 7% 7% 43%	1778
	11th to 20th	Night	14% 12% 4 8% 5% 3 4 4 5% 7% 33%	1599
	21st to end	Night	12% 9% 4 6% 6% 4 5% 5% 5% 7% 37%	1620
May	1st to 10th	Night	14% 7% 3 5% 5% 4 4 4 5% 6% 43%	1562
	11th to 20th	Night	14% 7% 3 6% 4 3 4 4 6% 7% 42%	1270
	21st to end	Night	18% 7% 2 5% 5% 3 4 3 5% 7% 41%	1358
June	1st to 10th	Night	13% 5% 2 5% 4 3 4 5% 6% 8% 44%	1260
	11th to 20th	Night	12% 5% 2 7% 5% 3 5% 5% 5% 8% 44%	1260
	21st to end	Night	10% 5% 2 5% 4 3 5% 6% 7% 11% 42%	1260
July	1st to 10th	Night	7% 3 1 4 3 2 4 5% 5% 8% 58%	1260
	11th to 20th	Night	6% 3 1 4 4 3 5% 6% 6% 9% 54%	1260
	21st to end	Night	6% 3 1 3 4 3 4 5% 5% 7% 60%	1524
August	1st to 10th	Night	6% 5% 2 3 4 3 4 6% 6% 9% 52%	1432
	11th to 20th	Night	7% 4 2 4 5% 2 5% 5% 6% 8% 53%	1590
	21st to end	Night	11% 5% 1 4 4 2 3 3 4 6% 56%	1782
September	1st to 10th	Night	7% 5% 2 4 4 3 4 4 5% 8% 54%	1754
	11th to 20th	Night	13% 5% 2 4 4 2 4 4 5% 8% 48%	1980
	21st to end	Night	15% 6% 3 7% 4 2 3 4 4 8% 43%	1980
October	1st to 10th	Night	15% 9% 3 6% 6% 3 4 4 5% 6% 41%	2034
	11th to 20th	Night	15% 8% 2 6% 5% 3 5% 5% 5% 7% 41%	2290
	21st to end	Night	11% 11% 5% 6% 5% 5% 5% 5% 5% 6% 36%	2574
November	1st to 10th	Night	12% 11% 5% 8% 7% 3 5% 5% 6% 6% 32%	2464
	11th to 20th	Night	10% 13% 7% 10% 7% 3 5% 4 5% 6% 30%	2693
	21st to end	Night	10% 11% 6% 10% 7% 4 5% 4 4 6% 33%	2850
December	1st to 10th	Night	8% 11% 5% 10% 10% 5% 6% 6% 6% 7% 27%	2850
	11th to 20th	Night	10% 14% 7% 13% 8% 4 6% 5% 6% 7% 22%	3518
	21st to end	Night	7% 9% 4 8% 8% 4 6% 5% 5% 7% 36%	5225

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	57% 9% 19% 12% 3	2219
	11th to 20th	Day	60% 8% 14% 15% 4	2391
	21st to end	Day	54% 8% 11% 21% 6%	2794
February	1st to 10th	Day	58% 7% 12% 17% 6%	1476
	11th to 20th	Day	50% 9% 14% 17% 9%	1600
	21st to end	Day	54% 7% 14% 19% 7%	1480
March	1st to 10th	Day	60% 9% 13% 14% 5%	1800
	11th to 20th	Day	50% 7% 14% 22% 7%	1946
	21st to end	Day	53% 8% 14% 18% 7%	2216
April	1st to 10th	Day	45% 6% 15% 24% 9% 1	2182
	11th to 20th	Day	53% 5% 12% 17% 11% 1	2312
	21st to end	Day	47% 7% 17% 20% 8% 1	2340
May	1st to 10th	Day	44% 6% 13% 25% 11% 1	2394
	11th to 20th	Day	45% 7% 11% 25% 11% 1	2628
	21st to end	Day	47% 7% 13% 22% 9% 1	2918
June	1st to 10th	Day	42% 9% 18% 21% 9% 1	2700
	11th to 20th	Day	47% 8% 16% 17% 10% 1	2700
	21st to end	Day	40% 10% 21% 23% 5% 1	2700
July	1st to 10th	Day	31% 10% 21% 28% 10%	2626
	11th to 20th	Day	35% 9% 19% 26% 11% 1	2619
	21st to end	Day	28% 9% 20% 33% 10%	2636
August	1st to 10th	Day	34% 9% 18% 29% 9% 1	2491
	11th to 20th	Day	32% 10% 21% 30% 7%	2310
	21st to end	Day	35% 7% 16% 31% 11% 1	2574
September	1st to 10th	Day	34% 7% 18% 29% 11% 1	2202
	11th to 20th	Day	40% 8% 18% 26% 9% 1	1980
	21st to end	Day	40% 6% 15% 30% 8%	1980
October	1st to 10th	Day	49% 6% 14% 23% 7%	1908
	11th to 20th	Day	46% 7% 15% 24% 8% 1	1666
	21st to end	Day	55% 8% 15% 16% 6%	1782
November	1st to 10th	Day	57% 7% 11% 17% 7% 1	1612
	11th to 20th	Day	55% 6% 16% 16% 6%	1482
	21st to end	Day	54% 8% 17% 16% 5%	1330
December	1st to 10th	Day	61% 7% 15% 12% 4	1330
	11th to 20th	Day	63% 8% 13% 12% 5%	1680
	21st to end	Day	46% 5% 16% 20% 13% 1	2442
January	1st to 10th	Night	55% 10% 12% 18% 4	4737
	11th to 20th	Night	60% 8% 13% 14% 4	4576
	21st to end	Night	57% 8% 12% 19% 4	4873
February	1st to 10th	Night	52% 7% 14% 19% 8% 1	2577
	11th to 20th	Night	46% 7% 15% 20% 11% 1	2274
	21st to end	Night	46% 7% 14% 23% 10%	1776
March	1st to 10th	Night	53% 8% 15% 17% 7%	2160
	11th to 20th	Night	41% 7% 14% 26% 10% 1	2013
	21st to end	Night	48% 8% 16% 19% 8%	2138
April	1st to 10th	Night	37% 7% 13% 23% 17% 2	1778
	11th to 20th	Night	50% 6% 11% 19% 13% 1	1599
	21st to end	Night	46% 7% 14% 20% 12% 2	1620
May	1st to 10th	Night	40% 7% 15% 25% 13%	1562
	11th to 20th	Night	41% 6% 12% 24% 13% 3	1270
	21st to end	Night	44% 6% 13% 21% 14% 1	1358
June	1st to 10th	Night	36% 7% 21% 24% 9% 2	1260
	11th to 20th	Night	38% 8% 16% 25% 11% 2	1260
	21st to end	Night	33% 12% 21% 26% 7% 1	1260
July	1st to 10th	Night	22% 8% 20% 35% 14% 1	1225
	11th to 20th	Night	25% 11% 21% 27% 15% 1	1218
	21st to end	Night	23% 7% 17% 37% 14% 2	1439
August	1st to 10th	Night	27% 8% 19% 31% 13% 1	1424
	11th to 20th	Night	27% 9% 20% 32% 11% 1	1590
	21st to end	Night	30% 6% 15% 32% 16% 2	1782
September	1st to 10th	Night	29% 7% 15% 32% 15% 2	1754
	11th to 20th	Night	34% 7% 18% 27% 13% 1	1980
	21st to end	Night	41% 6% 13% 30% 9% 1	1980
October	1st to 10th	Night	45% 7% 17% 23% 9%	2034
	11th to 20th	Night	43% 6% 14% 28% 9%	2290
	21st to end	Night	47% 7% 16% 24% 6%	2574
November	1st to 10th	Night	51% 8% 15% 17% 8% 2	2464
	11th to 20th	Night	56% 8% 15% 15% 6% 1	2693
	21st to end	Night	54% 7% 17% 17% 6%	2850
December	1st to 10th	Night	55% 7% 15% 17% 6%	2850
	11th to 20th	Night	61% 6% 15% 13% 4	3516
	21st to end	Night	45% 8% 15% 18% 13% 2	5225

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	10% 8% 32% 30% 16% 3	270
	11th to 20th	Day	10% 9% 33% 35% 10% 2	270
	21st to end	Day	15% 8% 32% 29% 13% 3	297
February	1st to 10th	Day	14% 10% 41% 25% 9% 2	252
	11th to 20th	Day	8% 10% 38% 32% 11% 1	240
	21st to end	Day	6% 4 38% 35% 15% 2	198
March	1st to 10th	Day	13% 8% 31% 37% 9% 2	240
	11th to 20th	Day	13% 10% 27% 33% 15% 2	240
	21st to end	Day	15% 10% 32% 26% 13% 4	302
April	1st to 10th	Day	15% 12% 35% 27% 9% 1	442
	11th to 20th	Day	18% 11% 33% 24% 13% 1	590
	21st to end	Day	15% 10% 35% 27% 12% 1	600
May	1st to 10th	Day	17% 10% 27% 30% 15% 2	603
	11th to 20th	Day	19% 8% 31% 23% 14% 5%	625
	21st to end	Day	21% 9% 24% 27% 16% 3	679
June	1st to 10th	Day	14% 11% 29% 27% 13% 6%	630
	11th to 20th	Day	17% 11% 32% 24% 13% 4	630
	21st to end	Day	11% 7% 27% 32% 18% 4	630
July	1st to 10th	Day	9% 6% 27% 33% 19% 7%	621
	11th to 20th	Day	11% 7% 30% 27% 20% 4	618
	21st to end	Day	6% 6% 25% 32% 24% 7%	684
August	1st to 10th	Day	9% 5% 27% 31% 22% 6%	626
	11th to 20th	Day	9% 6% 25% 29% 23% 8%	615
	21st to end	Day	14% 6% 24% 33% 19% 4	693
September	1st to 10th	Day	12% 9% 32% 30% 14% 3	492
	11th to 20th	Day	16% 6% 30% 33% 13% 1	270
	21st to end	Day	21% 11% 24% 31% 10% 2	270
October	1st to 10th	Day	24% 13% 24% 20% 15% 3	270
	11th to 20th	Day	17% 9% 34% 27% 11% 1	270
	21st to end	Day	23% 9% 35% 23% 7% 2	297
November	1st to 10th	Day	26% 10% 31% 21% 11% 1	270
	11th to 20th	Day	13% 11% 36% 30% 9% 1	270
	21st to end	Day	17% 11% 37% 30% 6%	270
December	1st to 10th	Day	14% 7% 39% 24% 13% 3	270
	11th to 20th	Day	17% 10% 37% 30% 6% 1	270
	21st to end	Day	10% 6% 35% 31% 14% 3	297
January	1st to 10th	Night	12% 9% 33% 32% 12% 1	950
	11th to 20th	Night	15% 6% 37% 33% 8% 1	950
	21st to end	Night	14% 7% 35% 35% 8% 1	1045
February	1st to 10th	Night	12% 7% 36% 33% 11% 1	923
	11th to 20th	Night	11% 7% 32% 37% 10% 2	879
	21st to end	Night	11% 6% 31% 36% 14% 2	592
March	1st to 10th	Night	16% 5% 31% 32% 13% 3	720
	11th to 20th	Night	10% 8% 33% 35% 13% 1	573
	21st to end	Night	17% 6% 29% 31% 14% 2	594
April	1st to 10th	Night	9% 7% 37% 35% 11% 1	540
	11th to 20th	Night	18% 6% 32% 34% 9% 1	533
	21st to end	Night	14% 8% 34% 32% 12% 1	540
May	1st to 10th	Night	17% 5% 29% 37% 10% 1	540
	11th to 20th	Night	17% 7% 28% 35% 13%	531
	21st to end	Night	21% 8% 26% 32% 14% 1	584
June	1st to 10th	Night	14% 6% 31% 32% 15% 1	540
	11th to 20th	Night	12% 6% 32% 34% 15% 1	540
	21st to end	Night	12% 6% 24% 39% 19% 1	540
July	1st to 10th	Night	6% 4 24% 44% 21%	525
	11th to 20th	Night	7% 6% 27% 41% 18% 1	522
	21st to end	Night	7% 3 24% 42% 21% 3	591
August	1st to 10th	Night	7% 4 23% 43% 22% 1	537
	11th to 20th	Night	8% 4 22% 39% 23% 4	534
	21st to end	Night	12% 6% 23% 39% 19% 1	594
September	1st to 10th	Night	10% 3 31% 35% 18% 3	540
	11th to 20th	Night	15% 5% 28% 40% 12%	540
	21st to end	Night	18% 6% 28% 35% 12% 1	540
October	1st to 10th	Night	18% 8% 33% 30% 11% 1	594
	11th to 20th	Night	19% 8% 30% 31% 11%	850
	21st to end	Night	16% 11% 36% 28% 9% 1	990
November	1st to 10th	Night	17% 9% 35% 28% 9% 1	925
	11th to 20th	Night	16% 8% 37% 27% 10% 2	950
	21st to end	Night	16% 12% 37% 28% 7% 1	950
December	1st to 10th	Night	11% 7% 37% 32% 10% 2	950
	11th to 20th	Night	16% 11% 33% 29% 10% 2	950
	21st to end	Night	18% 5% 32% 31% 13% 2	1045

Page generated at 2024-02-02 04:20:32. Version ac07

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