Buck Hall Recreation Centre
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Buck Hall Recreation Centre clear sky chart from 2005-11-06 to 2024-02-20.

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	11% 5% 2 5% 5% 3 5% 5% 6% 9% 43%	78816
	Night	12% 6% 2 5% 5% 3 4 5% 6% 8% 44%	80380
Transparency	Day	24% 39% 10% 13% 11% 3	78538
	Night	25% 37% 9% 12% 12% 4	80177
Seeing	Day	12% 9% 26% 28% 19% 7%	14583
	Night	13% 8% 23% 30% 21% 4	24773

By Month

Percentage Cloud Cover SE (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	14% 5% 2 4 5% 3 4 5% 6% 8% 44%	2836
	11th to 20th	Day	12% 4 3 5% 5% 3 4 4 5% 9% 48%	2840
	21st to end	Day	15% 8% 3 5% 4 3 3 3 4 6% 45%	3124
February	1st to 10th	Day	15% 5% 2 6% 5% 3 6% 4 6% 6% 42%	1710
	11th to 20th	Day	20% 7% 2 4 4 2 3 4 4 4 46%	1778
	21st to end	Day	15% 6% 3 6% 4 3 4 4 5% 5% 45%	1628
March	1st to 10th	Day	14% 4 2 4 4 2 4 4 5% 7% 51%	1980
	11th to 20th	Day	13% 5% 2 5% 5% 3 5% 5% 5% 8% 42%	1980
	21st to end	Day	13% 4 2 5% 6% 3 4 5% 6% 7% 45%	2178
April	1st to 10th	Day	9% 4 1 3 4 2 5% 5% 6% 7% 53%	2028
	11th to 20th	Day	10% 3 1 4 5% 2 5% 5% 5% 7% 52%	2134
	21st to end	Day	7% 3 1 4 3 2 4 5% 6% 9% 56%	2160
May	1st to 10th	Day	6% 4 2 4 5% 3 5% 5% 7% 8% 51%	2268
	11th to 20th	Day	10% 5% 2 5% 6% 3 5% 5% 7% 8% 43%	2301
	21st to end	Day	9% 5% 3 5% 5% 3 6% 7% 8% 10% 38%	2531
June	1st to 10th	Day	10% 6% 3 6% 7% 3 7% 7% 8% 11% 32%	2340
	11th to 20th	Day	9% 3 2 4 5% 3 6% 6% 9% 12% 39%	2340
	21st to end	Day	6% 4 2 6% 6% 4 7% 8% 9% 13% 34%	2340
July	1st to 10th	Day	8% 5% 3 5% 6% 4 7% 8% 9% 13% 33%	2340
	11th to 20th	Day	8% 4 2 6% 6% 4 7% 9% 9% 12% 33%	2340
	21st to end	Day	7% 5% 2 5% 6% 4 6% 8% 8% 14% 34%	2547
August	1st to 10th	Day	8% 4 2 6% 7% 5% 7% 8% 9% 13% 31%	2327
	11th to 20th	Day	9% 4 3 6% 6% 4 7% 9% 8% 13% 29%	2214
	21st to end	Day	13% 7% 2 6% 7% 4 7% 7% 8% 9% 29%	2376
September	1st to 10th	Day	11% 5% 2 5% 6% 3 6% 6% 8% 11% 38%	2113
	11th to 20th	Day	13% 7% 3 6% 6% 3 6% 5% 6% 9% 37%	1980
	21st to end	Day	14% 8% 3 5% 5% 3 4 4 6% 8% 40%	1980
October	1st to 10th	Day	14% 5% 2 5% 4 3 4 3 4 6% 49%	1807
	11th to 20th	Day	9% 3 2 4 4 2 4 3 5% 7% 58%	1800
	21st to end	Day	10% 4 2 3 4 3 3 3 4 7% 56%	1980
November	1st to 10th	Day	12% 4 2 3 4 2 4 3 4 6% 57%	1857
	11th to 20th	Day	12% 6% 2 5% 5% 3 4 4 4 7% 48%	1900
	21st to end	Day	13% 4 2 4 4 2 4 4 4 7% 51%	1772
December	1st to 10th	Day	14% 5% 3 5% 5% 3 5% 6% 5% 6% 42%	1710
	11th to 20th	Day	14% 5% 2 4 3 2 4 3 4 5% 55%	2153
	21st to end	Day	17% 8% 2 5% 4 3 4 4 4 6% 43%	3124
January	1st to 10th	Night	14% 7% 2 5% 4 3 5% 5% 6% 7% 43%	4109
	11th to 20th	Night	12% 7% 2 5% 5% 4 5% 5% 6% 8% 41%	4120
	21st to end	Night	15% 7% 3 5% 6% 3 4 4 4 5% 44%	4532
February	1st to 10th	Night	16% 6% 3 6% 5% 3 4 3 5% 7% 44%	2470
	11th to 20th	Night	18% 6% 2 6% 5% 3 4 4 4 6% 43%	2268
	21st to end	Night	14% 8% 3 6% 4 4 5% 4 5% 6% 41%	1628
March	1st to 10th	Night	10% 5% 2 5% 5% 3 4 4 5% 7% 49%	1980
	11th to 20th	Night	11% 5% 3 6% 6% 3 4 4 6% 7% 46%	1980
	21st to end	Night	12% 6% 2 5% 4 3 4 5% 5% 9% 46%	2178
April	1st to 10th	Night	10% 5% 2 4 4 3 5% 4 5% 8% 51%	1931
	11th to 20th	Night	11% 4 2 5% 4 3 4 5% 6% 7% 49%	1775
	21st to end	Night	7% 4 2 4 5% 3 4 5% 5% 8% 55%	1800
May	1st to 10th	Night	7% 4 2 4 4 3 5% 5% 6% 8% 54%	1706
	11th to 20th	Night	9% 4 2 5% 4 3 3 5% 6% 10% 47%	1592
	21st to end	Night	9% 4 3 4 6% 3 5% 5% 8% 9% 44%	1744
June	1st to 10th	Night	10% 7% 3 5% 6% 3 5% 5% 8% 12% 35%	1620
	11th to 20th	Night	8% 5% 2 4 4 3 5% 7% 9% 13% 40%	1620
	21st to end	Night	6% 5% 2 4 6% 4 6% 9% 10% 14% 34%	1620
July	1st to 10th	Night	8% 6% 2 5% 6% 4 6% 5% 8% 14% 36%	1620
	11th to 20th	Night	8% 5% 3 6% 6% 4 6% 7% 9% 12% 34%	1620
	21st to end	Night	6% 5% 2 5% 5% 3 6% 7% 7% 14% 40%	1771
August	1st to 10th	Night	6% 5% 3 6% 7% 3 6% 7% 9% 15% 33%	1611
	11th to 20th	Night	9% 5% 2 6% 7% 5% 7% 7% 9% 13% 30%	1668
	21st to end	Night	12% 6% 3 7% 6% 5% 6% 7% 8% 11% 31%	1980
September	1st to 10th	Night	10% 4 3 6% 7% 5% 5% 7% 7% 11% 35%	1842
	11th to 20th	Night	11% 6% 3 6% 7% 3 4 5% 7% 10% 38%	1980
	21st to end	Night	15% 6% 2 6% 5% 3 4 5% 5% 9% 39%	1980
October	1st to 10th	Night	12% 5% 3 5% 5% 3 4 5% 5% 7% 47%	2151
	11th to 20th	Night	9% 4 1 4 4 3 3 4 5% 7% 57%	2160
	21st to end	Night	10% 4 2 4 3 2 4 4 5% 6% 55%	2376
November	1st to 10th	Night	10% 4 1 4 4 2 4 4 4 6% 56%	2221
	11th to 20th	Night	13% 6% 2 5% 4 3 3 3 5% 6% 50%	2280
	21st to end	Night	11% 5% 3 5% 5% 3 4 5% 6% 8% 47%	2403
December	1st to 10th	Night	15% 6% 2 6% 5% 3 5% 5% 5% 7% 41%	2470
	11th to 20th	Night	17% 5% 2 5% 4 2 3 3 4 5% 49%	3042
	21st to end	Night	18% 7% 2 5% 4 2 4 4 5% 7% 41%	4532

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	24% 28% 9% 16% 19% 5%	2837
	11th to 20th	Day	26% 27% 5% 15% 19% 8%	2840
	21st to end	Day	32% 26% 7% 14% 14% 7%	3124
February	1st to 10th	Day	29% 36% 5% 13% 13% 4	1710
	11th to 20th	Day	29% 36% 4 9% 15% 6%	1787
	21st to end	Day	24% 38% 8% 14% 10% 6%	1628
March	1st to 10th	Day	21% 37% 7% 13% 16% 7%	1980
	11th to 20th	Day	25% 39% 11% 13% 8% 5%	1980
	21st to end	Day	24% 39% 11% 13% 11% 2	2178
April	1st to 10th	Day	18% 38% 10% 14% 16% 4	2028
	11th to 20th	Day	17% 37% 8% 16% 15% 7%	2134
	21st to end	Day	17% 40% 10% 17% 14% 3	2160
May	1st to 10th	Day	19% 40% 13% 19% 8% 2	2268
	11th to 20th	Day	22% 42% 14% 14% 7% 1	2305
	21st to end	Day	23% 42% 13% 14% 8%	2531
June	1st to 10th	Day	28% 43% 11% 11% 6%	2340
	11th to 20th	Day	24% 42% 14% 15% 4	2340
	21st to end	Day	24% 43% 15% 12% 6%	2340
July	1st to 10th	Day	26% 44% 11% 13% 6% 1	2275
	11th to 20th	Day	24% 46% 16% 8% 5%	2271
	21st to end	Day	23% 46% 18% 12%	2405
August	1st to 10th	Day	21% 43% 17% 16% 3	2314
	11th to 20th	Day	29% 44% 14% 11% 2	2214
	21st to end	Day	33% 44% 11% 9% 3	2376
September	1st to 10th	Day	24% 44% 12% 10% 8% 1	2113
	11th to 20th	Day	26% 43% 11% 11% 8% 2	1980
	21st to end	Day	27% 39% 8% 13% 10% 3	1980
October	1st to 10th	Day	22% 39% 6% 10% 19% 4	1807
	11th to 20th	Day	20% 38% 7% 12% 17% 6%	1800
	21st to end	Day	20% 38% 6% 12% 18% 6%	1980
November	1st to 10th	Day	14% 41% 7% 11% 17% 9%	1857
	11th to 20th	Day	25% 41% 5% 11% 14% 5%	1900
	21st to end	Day	23% 40% 6% 12% 14% 5%	1772
December	1st to 10th	Day	23% 43% 8% 13% 8% 5%	1710
	11th to 20th	Day	24% 33% 7% 16% 17% 4	2150
	21st to end	Day	30% 27% 7% 15% 19% 3	3124
January	1st to 10th	Night	27% 29% 7% 12% 18% 7%	4109
	11th to 20th	Night	31% 27% 7% 13% 19% 3	4120
	21st to end	Night	33% 26% 6% 10% 19% 7%	4532
February	1st to 10th	Night	29% 35% 5% 13% 13% 6%	2470
	11th to 20th	Night	29% 36% 5% 9% 12% 8%	2270
	21st to end	Night	24% 38% 9% 14% 8% 7%	1628
March	1st to 10th	Night	22% 38% 7% 12% 15% 8%	1980
	11th to 20th	Night	23% 39% 11% 13% 9% 5%	1980
	21st to end	Night	24% 38% 12% 13% 9% 4	2178
April	1st to 10th	Night	21% 38% 8% 14% 14% 5%	1931
	11th to 20th	Night	19% 37% 5% 15% 15% 8%	1775
	21st to end	Night	18% 37% 10% 17% 15% 3	1800
May	1st to 10th	Night	18% 39% 11% 18% 11% 2	1706
	11th to 20th	Night	23% 42% 12% 14% 9%	1593
	21st to end	Night	22% 43% 13% 14% 8%	1745
June	1st to 10th	Night	27% 40% 12% 13% 7%	1620
	11th to 20th	Night	24% 43% 13% 16% 4	1620
	21st to end	Night	23% 44% 15% 14% 4	1620
July	1st to 10th	Night	26% 43% 12% 12% 6% 1	1575
	11th to 20th	Night	26% 45% 16% 8% 4 1	1566
	21st to end	Night	22% 45% 18% 14% 1	1672
August	1st to 10th	Night	22% 44% 18% 14% 3	1600
	11th to 20th	Night	30% 43% 13% 13% 2	1668
	21st to end	Night	33% 42% 12% 9% 2	1980
September	1st to 10th	Night	28% 42% 8% 13% 7% 2	1842
	11th to 20th	Night	24% 43% 12% 11% 9% 1	1980
	21st to end	Night	29% 39% 8% 12% 10% 2	1980
October	1st to 10th	Night	24% 37% 7% 9% 18% 5%	2151
	11th to 20th	Night	21% 38% 7% 12% 16% 7%	2160
	21st to end	Night	20% 38% 6% 11% 15% 9%	2376
November	1st to 10th	Night	14% 42% 7% 10% 17% 10%	2221
	11th to 20th	Night	24% 40% 6% 9% 15% 6%	2280
	21st to end	Night	24% 41% 7% 10% 13% 5%	2403
December	1st to 10th	Night	23% 43% 9% 10% 10% 5%	2470
	11th to 20th	Night	27% 34% 7% 13% 17% 2	3044
	21st to end	Night	30% 27% 6% 17% 16% 4	4532

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	16% 19% 46% 18% 2	270
	11th to 20th	Day	10% 21% 40% 22% 7%	270
	21st to end	Day	21% 24% 43% 11% 1 1	297
February	1st to 10th	Day	14% 21% 41% 21% 3	270
	11th to 20th	Day	24% 18% 40% 14% 3	285
	21st to end	Day	15% 16% 44% 19% 5% 1	346
March	1st to 10th	Day	13% 19% 35% 25% 8%	420
	11th to 20th	Day	15% 18% 39% 20% 7% 1	420
	21st to end	Day	13% 16% 39% 20% 10% 2	462
April	1st to 10th	Day	13% 19% 35% 22% 10% 2	420
	11th to 20th	Day	8% 16% 33% 24% 15% 5%	412
	21st to end	Day	7% 12% 29% 31% 13% 7%	420
May	1st to 10th	Day	5% 13% 39% 26% 12% 5%	423
	11th to 20th	Day	11% 4 26% 34% 21% 5%	447
	21st to end	Day	11% 5% 21% 32% 20% 11%	485
June	1st to 10th	Day	12% 4 20% 32% 24% 8%	450
	11th to 20th	Day	9% 3 19% 29% 26% 14%	450
	21st to end	Day	9% 3 13% 34% 28% 12%	450
July	1st to 10th	Day	7% 1 8% 33% 36% 14%	445
	11th to 20th	Day	8% 2 7% 32% 37% 15%	444
	21st to end	Day	6% 1 11% 38% 33% 10%	488
August	1st to 10th	Day	11% 3 12% 29% 32% 13%	446
	11th to 20th	Day	10% 2 8% 28% 36% 18%	439
	21st to end	Day	15% 3 9% 28% 32% 14%	495
September	1st to 10th	Day	9% 2 10% 36% 31% 12%	450
	11th to 20th	Day	14% 4 16% 34% 26% 7%	450
	21st to end	Day	16% 1 17% 30% 25% 10%	450
October	1st to 10th	Day	16% 5% 26% 31% 14% 8%	450
	11th to 20th	Day	9% 8% 22% 33% 21% 7%	450
	21st to end	Day	10% 7% 25% 35% 18% 4	495
November	1st to 10th	Day	15% 7% 32% 24% 18% 4	455
	11th to 20th	Day	18% 10% 38% 23% 10% 2	460
	21st to end	Day	14% 12% 33% 29% 11% 1	332
December	1st to 10th	Day	20% 6% 42% 26% 6% 1	270
	11th to 20th	Day	16% 21% 34% 21% 6% 1	270
	21st to end	Day	22% 16% 33% 19% 9% 1	297
January	1st to 10th	Night	14% 17% 34% 28% 6%	760
	11th to 20th	Night	13% 17% 30% 29% 11%	760
	21st to end	Night	19% 17% 36% 24% 4	836
February	1st to 10th	Night	17% 12% 34% 29% 7%	760
	11th to 20th	Night	20% 14% 34% 28% 4	742
	21st to end	Night	17% 13% 34% 28% 8% 1	592
March	1st to 10th	Night	11% 13% 37% 31% 8%	720
	11th to 20th	Night	14% 11% 34% 31% 9% 1	720
	21st to end	Night	14% 13% 33% 28% 13%	792
April	1st to 10th	Night	13% 12% 32% 31% 12% 1	720
	11th to 20th	Night	13% 9% 28% 30% 17% 2	711
	21st to end	Night	7% 9% 30% 36% 17% 1	720
May	1st to 10th	Night	8% 8% 30% 33% 20% 2	626
	11th to 20th	Night	9% 4 24% 35% 24% 4	531
	21st to end	Night	10% 1 14% 31% 33% 10%	584
June	1st to 10th	Night	11% 2 12% 40% 30% 5%	540
	11th to 20th	Night	8% 2 11% 31% 36% 11%	540
	21st to end	Night	6% 2 12% 38% 35% 7%	540
July	1st to 10th	Night	9% 2 7% 33% 43% 6%	525
	11th to 20th	Night	9% 1 5% 29% 43% 13%	522
	21st to end	Night	6% 1 7% 38% 42% 7%	591
August	1st to 10th	Night	10% 2 4 30% 43% 10%	537
	11th to 20th	Night	10% 1 7% 31% 41% 9%	604
	21st to end	Night	13% 2 7% 27% 39% 12%	792
September	1st to 10th	Night	11% 2 11% 26% 42% 8%	720
	11th to 20th	Night	13% 2 10% 34% 32% 8%	720
	21st to end	Night	18% 2 13% 26% 32% 8%	720
October	1st to 10th	Night	14% 5% 20% 30% 24% 7%	720
	11th to 20th	Night	10% 6% 23% 31% 25% 5%	720
	21st to end	Night	13% 7% 21% 33% 21% 4	792
November	1st to 10th	Night	11% 8% 26% 34% 18% 3	740
	11th to 20th	Night	17% 11% 26% 31% 13% 2	760
	21st to end	Night	13% 11% 29% 28% 18% 2	760
December	1st to 10th	Night	16% 12% 29% 30% 12% 1	760
	11th to 20th	Night	19% 12% 27% 27% 13% 2	760
	21st to end	Night	19% 13% 30% 27% 10% 1	836

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