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 2024-10-20.

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	12% 6% 2 6% 5% 4 5% 4 6% 9% 42%	100933
	Night	12% 6% 2 6% 4 4 4 4 6% 8% 43%	97705
Transparency	Day	20% 51% 9% 11% 8% 2	100742
	Night	20% 51% 8% 10% 8% 2	97566
Seeing	Day	13% 9% 26% 28% 18% 6%	15555
	Night	13% 8% 23% 30% 21% 4	25641

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	13% 5% 2 5% 4 4 4 4 6% 8% 44%	2836
	11th to 20th	Day	12% 5% 2 5% 5% 4 4 3 5% 9% 47%	2840
	21st to end	Day	15% 9% 2 6% 4 4 3 3 4 6% 45%	3124
February	1st to 10th	Day	15% 6% 2 6% 5% 5% 5% 4 6% 6% 42%	1710
	11th to 20th	Day	19% 7% 2 5% 3 3 3 3 4 4 46%	1789
	21st to end	Day	14% 7% 2 7% 3 4 4 3 5% 6% 45%	1727
March	1st to 10th	Day	22% 10% 3 7% 4 3 4 3 4 6% 35%	3435
	11th to 20th	Day	9% 4 2 5% 4 4 4 4 5% 8% 52%	3480
	21st to end	Day	19% 5% 2 5% 4 3 3 4 5% 5% 45%	3815
April	1st to 10th	Day	9% 5% 1 4 4 4 4 4 6% 7% 53%	2141
	11th to 20th	Day	10% 3 1 5% 4 3 5% 4 5% 7% 52%	2254
	21st to end	Day	6% 3 1 4 3 3 4 4 6% 9% 56%	2280
May	1st to 10th	Day	7% 5% 2 5% 5% 5% 5% 5% 7% 10% 45%	3957
	11th to 20th	Day	13% 6% 2 7% 5% 5% 4 4 6% 7% 40%	4081
	21st to end	Day	6% 4 2 4 3 4 5% 5% 8% 11% 49%	4476
June	1st to 10th	Day	10% 6% 3 7% 6% 5% 6% 6% 8% 11% 32%	2470
	11th to 20th	Day	9% 4 2 4 5% 5% 6% 5% 9% 12% 39%	2470
	21st to end	Day	6% 5% 2 6% 6% 6% 7% 7% 10% 12% 34%	2470
July	1st to 10th	Day	13% 6% 3 7% 6% 6% 7% 6% 8% 11% 28%	4120
	11th to 20th	Day	6% 4 3 8% 6% 6% 8% 7% 10% 13% 30%	4120
	21st to end	Day	6% 6% 2 8% 7% 7% 7% 7% 10% 14% 27%	4466
August	1st to 10th	Day	18% 7% 3 8% 6% 6% 6% 5% 8% 10% 23%	4104
	11th to 20th	Day	6% 5% 2 7% 5% 6% 7% 7% 9% 12% 34%	3885
	21st to end	Day	10% 6% 2 6% 5% 4 5% 5% 8% 9% 39%	4180
September	1st to 10th	Day	11% 6% 2 5% 5% 4 6% 5% 8% 10% 38%	2230
	11th to 20th	Day	13% 7% 3 8% 5% 5% 5% 4 6% 9% 35%	2090
	21st to end	Day	13% 7% 3 6% 4 4 4 4 6% 8% 41%	2090
October	1st to 10th	Day	13% 5% 2 6% 4 4 4 2 5% 6% 48%	1907
	11th to 20th	Day	9% 3 2 4 4 3 3 2 4 7% 59%	1890
	21st to end	Day	10% 4 2 4 3 3 4 2 5% 7% 56%	1980
November	1st to 10th	Day	12% 4 2 4 4 3 3 2 4 6% 57%	1857
	11th to 20th	Day	12% 7% 2 6% 5% 4 4 3 5% 6% 47%	1900
	21st to end	Day	13% 5% 2 5% 3 3 5% 3 4 7% 51%	1772
December	1st to 10th	Day	14% 6% 3 6% 5% 5% 5% 4 5% 6% 42%	1710
	11th to 20th	Day	14% 5% 1 4 3 3 3 3 4 5% 54%	2153
	21st to end	Day	17% 8% 2 6% 3 4 3 3 4 6% 43%	3124
January	1st to 10th	Night	14% 7% 2 5% 4 4 4 4 6% 6% 43%	4109
	11th to 20th	Night	12% 7% 2 6% 4 5% 5% 4 6% 8% 41%	4120
	21st to end	Night	14% 8% 3 7% 4 3 4 3 4 5% 44%	4532
February	1st to 10th	Night	15% 6% 3 6% 4 3 4 3 6% 7% 44%	2470
	11th to 20th	Night	17% 7% 1 6% 4 4 4 3 5% 5% 43%	2272
	21st to end	Night	13% 8% 3 6% 4 5% 5% 3 5% 6% 42%	1727
March	1st to 10th	Night	20% 12% 4 7% 4 4 4 3 4 5% 33%	3418
	11th to 20th	Night	10% 4 2 6% 4 3 3 4 6% 7% 50%	3480
	21st to end	Night	16% 5% 2 5% 3 4 4 3 5% 8% 45%	3817
April	1st to 10th	Night	10% 5% 2 4 4 5% 4 3 5% 8% 50%	2038
	11th to 20th	Night	11% 5% 2 5% 3 4 4 4 6% 7% 50%	1875
	21st to end	Night	7% 5% 1 5% 4 4 4 4 5% 7% 54%	1900
May	1st to 10th	Night	6% 5% 2 5% 4 4 4 4 7% 9% 51%	2952
	11th to 20th	Night	13% 6% 2 6% 4 4 4 4 6% 8% 44%	2812
	21st to end	Night	7% 3 2 4 5% 4 5% 4 7% 9% 52%	3079
June	1st to 10th	Night	9% 7% 3 6% 5% 4 5% 4 9% 12% 35%	1710
	11th to 20th	Night	8% 5% 2 5% 4 4 5% 5% 9% 12% 40%	1710
	21st to end	Night	6% 5% 2 5% 6% 5% 6% 7% 10% 14% 34%	1710
July	1st to 10th	Night	10% 6% 2 7% 6% 6% 7% 5% 9% 11% 30%	2840
	11th to 20th	Night	7% 5% 3 8% 6% 6% 6% 6% 9% 13% 31%	2840
	21st to end	Night	5% 6% 2 7% 5% 6% 6% 6% 10% 16% 30%	3087
August	1st to 10th	Night	16% 8% 4 7% 5% 5% 5% 5% 8% 13% 24%	2825
	11th to 20th	Night	7% 5% 2 6% 5% 6% 6% 5% 9% 13% 36%	2911
	21st to end	Night	8% 4 2 7% 5% 5% 5% 4 6% 9% 44%	3476
September	1st to 10th	Night	10% 5% 2 7% 6% 6% 5% 5% 7% 11% 35%	1945
	11th to 20th	Night	11% 6% 3 7% 5% 4 5% 4 7% 10% 37%	2090
	21st to end	Night	15% 7% 2 7% 5% 4 4 4 5% 9% 40%	2090
October	1st to 10th	Night	12% 5% 2 6% 4 4 4 4 5% 7% 47%	2271
	11th to 20th	Night	8% 4 1 4 3 4 3 3 5% 7% 58%	2275
	21st to end	Night	10% 4 2 5% 3 3 4 3 5% 6% 55%	2376
November	1st to 10th	Night	10% 5% 1 5% 4 3 3 3 5% 6% 55%	2221
	11th to 20th	Night	13% 7% 2 5% 4 4 3 3 5% 6% 50%	2280
	21st to end	Night	10% 6% 2 5% 4 4 4 3 6% 8% 47%	2403
December	1st to 10th	Night	15% 6% 2 7% 4 4 5% 4 5% 7% 41%	2470
	11th to 20th	Night	17% 6% 2 5% 3 3 3 2 4 5% 49%	3042
	21st to end	Night	17% 8% 2 5% 4 4 4 3 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% 39% 4 12% 16% 5%	2837
	11th to 20th	Day	22% 39% 5% 10% 16% 8%	2840
	21st to end	Day	24% 43% 5% 10% 12% 5%	3124
February	1st to 10th	Day	15% 66% 4 8% 7% 1	1710
	11th to 20th	Day	15% 65% 4 7% 8% 2	1798
	21st to end	Day	17% 65% 3 4 6% 5%	1727
March	1st to 10th	Day	37% 44% 6% 7% 4 2	3435
	11th to 20th	Day	13% 44% 6% 9% 19% 9%	3480
	21st to end	Day	25% 42% 4 10% 14% 5%	3815
April	1st to 10th	Day	12% 66% 5% 7% 7% 3	2141
	11th to 20th	Day	13% 66% 4 8% 4 4	2254
	21st to end	Day	7% 66% 6% 12% 8% 2	2280
May	1st to 10th	Day	19% 47% 12% 15% 6% 1	3992
	11th to 20th	Day	26% 42% 8% 18% 6%	4085
	21st to end	Day	11% 44% 13% 20% 12%	4489
June	1st to 10th	Day	13% 68% 7% 8% 4	2470
	11th to 20th	Day	8% 68% 9% 10% 4	2470
	21st to end	Day	12% 68% 10% 9% 1	2470
July	1st to 10th	Day	31% 40% 16% 12% 1	4055
	11th to 20th	Day	26% 44% 23% 6% 1	4051
	21st to end	Day	29% 42% 17% 9% 2	4324
August	1st to 10th	Day	40% 40% 16% 4	4091
	11th to 20th	Day	20% 41% 15% 15% 8%	3924
	21st to end	Day	20% 39% 12% 27% 2	4180
September	1st to 10th	Day	15% 64% 9% 6% 5% 1	2230
	11th to 20th	Day	20% 62% 5% 8% 5% 1	2090
	21st to end	Day	18% 62% 8% 8% 4	2090
October	1st to 10th	Day	16% 60% 4 10% 7% 2	1907
	11th to 20th	Day	9% 61% 5% 11% 11% 3	1890
	21st to end	Day	9% 62% 4 9% 12% 4	1980
November	1st to 10th	Day	16% 59% 5% 7% 11% 2	1857
	11th to 20th	Day	17% 61% 4 6% 8% 4	1900
	21st to end	Day	13% 60% 4 10% 10% 2	1772
December	1st to 10th	Day	20% 61% 5% 7% 6% 2	1710
	11th to 20th	Day	15% 48% 2 12% 18% 5%	2150
	21st to end	Day	28% 39% 6% 12% 14% 1	3124
January	1st to 10th	Night	25% 41% 5% 8% 14% 7%	4109
	11th to 20th	Night	26% 39% 5% 10% 17% 3	4120
	21st to end	Night	24% 43% 4 7% 17% 6%	4532
February	1st to 10th	Night	13% 65% 4 9% 6% 2	2470
	11th to 20th	Night	16% 64% 4 6% 8% 3	2274
	21st to end	Night	18% 65% 3 3 6% 4	1727
March	1st to 10th	Night	39% 43% 7% 6% 3 2	3418
	11th to 20th	Night	19% 42% 5% 9% 18% 8%	3480
	21st to end	Night	23% 42% 6% 12% 12% 5%	3817
April	1st to 10th	Night	13% 66% 5% 6% 7% 3	2038
	11th to 20th	Night	14% 66% 3 8% 5% 3	1875
	21st to end	Night	10% 66% 4 11% 7% 2	1900
May	1st to 10th	Night	15% 47% 13% 17% 6% 2	2982
	11th to 20th	Night	23% 45% 8% 15% 9%	2813
	21st to end	Night	13% 43% 10% 19% 14% 1	3087
June	1st to 10th	Night	12% 68% 9% 8% 3	1710
	11th to 20th	Night	8% 68% 9% 10% 5%	1710
	21st to end	Night	13% 68% 9% 8% 2	1710
July	1st to 10th	Night	31% 39% 13% 16% 1	2795
	11th to 20th	Night	28% 42% 23% 5% 1	2786
	21st to end	Night	26% 43% 17% 12% 2	2988
August	1st to 10th	Night	37% 41% 17% 4	2814
	11th to 20th	Night	20% 41% 18% 17% 5%	2938
	21st to end	Night	17% 39% 11% 30% 2	3476
September	1st to 10th	Night	15% 63% 8% 7% 4 1	1945
	11th to 20th	Night	20% 62% 6% 7% 4 1	2090
	21st to end	Night	18% 62% 6% 10% 4	2090
October	1st to 10th	Night	15% 61% 5% 11% 7% 1	2271
	11th to 20th	Night	9% 61% 4 10% 11% 5%	2275
	21st to end	Night	9% 62% 3 9% 12% 4	2376
November	1st to 10th	Night	16% 59% 5% 7% 11% 3	2221
	11th to 20th	Night	16% 60% 5% 7% 8% 5%	2280
	21st to end	Night	13% 60% 4 9% 10% 4	2403
December	1st to 10th	Night	20% 61% 6% 6% 6% 1	2470
	11th to 20th	Night	18% 49% 3 8% 17% 4	3044
	21st to end	Night	28% 39% 6% 13% 12% 1	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% 15% 3	289
	21st to end	Day	16% 19% 42% 18% 4 1	382
March	1st to 10th	Day	15% 20% 33% 25% 8%	460
	11th to 20th	Day	13% 18% 40% 20% 7% 1	460
	21st to end	Day	15% 17% 39% 19% 9% 2	506
April	1st to 10th	Day	13% 19% 36% 21% 9% 2	460
	11th to 20th	Day	8% 16% 32% 24% 15% 5%	452
	21st to end	Day	7% 12% 29% 32% 13% 7%	460
May	1st to 10th	Day	5% 13% 37% 26% 13% 5%	463
	11th to 20th	Day	11% 5% 27% 32% 20% 5%	487
	21st to end	Day	10% 5% 22% 33% 20% 10%	529
June	1st to 10th	Day	11% 4 20% 33% 24% 8%	490
	11th to 20th	Day	9% 4 22% 29% 24% 13%	490
	21st to end	Day	8% 4 14% 35% 27% 12%	490
July	1st to 10th	Day	8% 1 8% 34% 36% 13%	485
	11th to 20th	Day	7% 2 7% 33% 37% 14%	484
	21st to end	Day	6% 1 11% 39% 33% 9%	532
August	1st to 10th	Day	13% 3 12% 29% 30% 13%	486
	11th to 20th	Day	10% 2 10% 27% 34% 17%	479
	21st to end	Day	15% 4 10% 28% 30% 13%	539
September	1st to 10th	Day	11% 2 13% 34% 29% 11%	490
	11th to 20th	Day	15% 4 17% 32% 24% 6%	490
	21st to end	Day	17% 1 19% 29% 24% 10%	490
October	1st to 10th	Day	17% 6% 26% 31% 13% 8%	490
	11th to 20th	Day	9% 8% 25% 32% 20% 6%	486
	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% 33% 29% 4	743
	21st to end	Night	17% 13% 35% 28% 7% 1	628
March	1st to 10th	Night	12% 14% 36% 31% 8%	760
	11th to 20th	Night	13% 12% 34% 30% 9% 1	760
	21st to end	Night	14% 13% 34% 27% 12%	836
April	1st to 10th	Night	12% 12% 33% 31% 11% 1	760
	11th to 20th	Night	13% 10% 27% 30% 17% 2	751
	21st to end	Night	7% 9% 30% 36% 17% 1	760
May	1st to 10th	Night	8% 8% 29% 33% 20% 2	660
	11th to 20th	Night	9% 5% 24% 34% 23% 4	561
	21st to end	Night	10% 1 15% 31% 33% 10%	617
June	1st to 10th	Night	11% 2 13% 40% 30% 5%	570
	11th to 20th	Night	8% 2 13% 31% 36% 11%	570
	21st to end	Night	6% 2 13% 38% 34% 7%	570
July	1st to 10th	Night	9% 2 7% 32% 44% 6%	555
	11th to 20th	Night	9% 1 5% 30% 42% 13%	552
	21st to end	Night	6% 1 7% 38% 41% 7%	624
August	1st to 10th	Night	12% 2 4 31% 41% 10%	567
	11th to 20th	Night	9% 2 8% 32% 40% 9%	638
	21st to end	Night	13% 2 8% 27% 38% 12%	836
September	1st to 10th	Night	12% 2 12% 26% 41% 8%	760
	11th to 20th	Night	14% 2 11% 33% 32% 7%	760
	21st to end	Night	18% 2 14% 27% 32% 8%	760
October	1st to 10th	Night	15% 4 20% 30% 24% 7%	760
	11th to 20th	Night	10% 7% 24% 31% 23% 5%	759
	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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